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Papers Published in Peer reviewed Journals

Papers Published in Proceedings/Books/Reports etc.

  
 
 
 
 
Papers Published in Peer reviewed Journals


73. G. Saranya, S. Abhilash, A. K. Sahai, Susmitha Joseph, R. Chattopadhyay, R. Mandal, A. Dey, R. Phani, New approach to improve the track prediction of Tropical cyclones over North Indian Ocean, Geophys. Res. Lett., (2018), DOI:10.1029/2018GL077650. 

72. De S. Agarwal, N K, Hazra, A., Chaudhari H S, Sahai A K, On unravelling mechanism of interplay between cloud and large scale circulation: a grey area in climate science, Climate Dynamics, online, April 2018, DOI:10.1007/s00382-018-4211-6, 1-22

71. Sahai S., Borah N., Chattopadhyay R., Joseph S., Abhilash S. , Bias‑correction and downscaling technique for operational extended range forecasts based on self organizing map, Climate Dynamics, 48, April 2017, DOI:10.1007/s00382-016-3214-4, 2437-2451

70. Shrivastava S., Kar S. C., Sahai A. K., Sharma A.R. , Identification of drought occurrences using Ensemble predictions up to 20-Days in advance, Water Resources Management, 32, April 2018, DOI: 10.1007/s11269-018-1921-9, 2113-2130

69. Chattopadhyay N., Rao K.V., Sahai A.K., Balasubramanian R., Pai D.S., Pattanaik D.R., Chandras S.V., Khedikar S., Usability of extended range and seasonal weather forecast in Indian agriculture, Mausam, 69, January 2018, 29-44

68. Abhilash S., Mandal R., Dey A., Phani R., Joseph S., Chattopadhyay R., De S., Agarwal N.K., Sahai A.K., Devi S.S., Rajeevan M. , Role of enhanced synoptic activity and its interaction with intraseasonal oscillations on the lower extended range prediction skill during 2015 monsoon season, Climate Dynamics, onlineJanuary 2018, DOI:10.1007/s00382-018-4089-3, 1-12.

67. Ghosh S., Bhatla R., Mall R. K., Srivastava P . K. and Sahai A. K., Aspect of ECMWF downscaled Regional Climate Modeling in simulating Indian summer monsoon rainfall and dependencies on lateral boundary conditions, Theoretical and Applied Climatology, 2018,https://doi.org/10.1007/s00704-018-2432-6 .

66. Sahai S., Borah N., Chattopadhyay R., Joseph S., Abhilash S. , Bias‑correction and downscaling technique for operational extended range forecasts based on self organizing map, Climate Dynamics, 48, April 2017, DOI:10.1007/s00382-016-3214-4, 2437-2451.

65. Ashok K., Shamal M., Sahai A. K., Swapna P , Nonlinearities in the evolutional distinctions between El Niño and La Niña types, Journal of Geophysical Research, 122, November 2017, DOI:10.1002/2017JC013129, 1-15.

64. Sahai A.K., Sharmila S., Chattopadhyay R., Abhilash S., Joseph S., Borah N., Goswami B.N., Pai D.S., Srivastava A.K. , Potential predictability of wet/dry spells transitions during extreme monsoon years: optimism for dynamical extended range prediction, Natural Hazards, 88, September 2017, DOI 10.1007/s11069-017-2895-2, 853-865.

63. Fadnavis S., Chattopadhyay R., Linkages of subtropical stratospheric intraseasonal intrusions with Indian summer monsoon deficit rainfall, Journal of Climate, 30, July 2017, DOI:10.1175/JCLI-D-16-0463.1, 5083-5096.

62. Sahai, A.K., S. Sharmila, R. Chattopadhyay, S. Abhilash, S. Joseph, N. Borah, B. N. Goswami, D. S. Pai and A. K. Srivastava, 2017, “Potential predictability of wet/dry spells transitions during extreme monsoon years: Optimism for dynamical extended range prediction” , Natural  Hazards, DOI :  10.1007/s11069-017-2895-2,  May  2017

61. Shah Reepal, Sahai A K, Mishra Vimal, Short-to-medium range hydrologic forecast to manage water and agricultural resources in India, Hydrology and Earth System Sciences, 21 February 2017, DOI:10-5194/hess-2016-504, 707-720

60. Sahai A.K., Borah N., Chattopadhyay R., Joseph S., Abhilash S., Bias-correction and downscaling technique for operational extended range forecasts based on self organizing map, Climate Dynamics, online, June 2016, DOI:10.1007/s00382- 016-3214-4, 1-15. . ISSN 1432-0894. 

59. Siddharth Kumar, Arora A., Chattopadhyay R., Hazra A., Suryachandra A. Rao, Goswami B.N. , Seminal role of stratiform clouds in large‑scale aggregation of tropical rain in boreal summer monsoon intraseasonal oscillations, Climate Dynamics, 48, February 2017, DOI:10.1007/s00382-016-3124-5, 999–1015.

58. Sahi N. K., Rai S., Sahai A. K., Abhilash S. , Intraseasonal variability of the South Asian monsoon and its relationship with the Indo–Pacific sea surface temperature in the NCEP CFSv2, International Journal of Climatology, DOI:10.1002/joc.5349.

57. Pillai P.A., Sahai A.K., Moisture dynamics of the northward and eastward propagating boreal summer intraseasonal oscillations: possible role of tropical Indo-west Pacific SST and circulation, Climate Dynamics, 47, August 2016, 1335– 1350. ISSN 0930-7575.

56. Mandke S.K., Sahai A.K., Twin tropical cyclones in the Indian Ocean: the role of equatorial waves, Natural Hazards, 84, December 2016, DOI:10.1007/s11069- 016-2546-z, 2211-2224. ISSN 0921-030X.

55. Joseph S., Sahai A. K., Chattopadhyay R., Sharmila S., Abhilash S., Rajeevan M., Mandal R., Dey A., Borah N., Phani R., Extremes in June rainfall during Indian summer monsoons of 2013 and 2014: Observational Analysis and Extended range prediction, Quarterly Journal of Royal Meteorological Society, 142, April 2016, DOI:10.1002/qj.2730, 1276- 1289. ISSN 0035-9009.

54. Agarwal N.K., Naik S.S., De S., Sahai A.K., Why are the Indian monsoon transients short-lived and less intensified during droughts vis-à-vis good monsoon years? An inspection through scale interactive energy exchanges in frequency domain, International Journal of Climatology, 36, June 2016, DOI:10.1002/joc.4531, 2958-2978. ISSN 0899-8418.

53. Sharmila S., Joseph S., Sahai A.K., Abhilash S., Chattopadhyay R., Future projection of Indian summer monsoon variability under climate change scenario: An assessment from CMIP5 climate models, Global and Planetary Change, 124, January 2015, DOI:10.1016/j.gloplacha.2014.11.004, 62–78. ISSN 0921-8181.

52. Sharmila S., Joseph S., Chattopadhyay R., Sahai A.K., Goswami B.N., Asymmetry in space-time characteristics of Indian summer monsoon intraseasonal oscillations during extreme years: Role of seasonal mean states, International Journal of Climatology, 35, June 2015, DOI:10.1002/joc.4100, 1948-1963. ISSN 0899-8418.

51. Sahai A.K., Chattopadhyay R., Joseph S., Mandal R., Dey A., Abhilash A., Krishna R.P.M., Borah N., Real-time performance of a multi-model ensemble based extended range forecast system in predicting the 2014 monsoon season based on NCEP-CFSv2, Current Science, 109, November 2015, 1802-1813. ISSN 0011- 3891.

50. Sahai A.K., Abhilash S., Chattopadhyay R., Borah N., Joseph S., Sharmila S, Rajeevan M., High-resolution operational monsoon forecasts: an objective assessment, Climate Dynamics, 44, June 2015, DOI:10.1007/s00382-014-2210-9, 3129-3140. . ISSN 0930-7575.

49. Joseph S., Sahai A.K., Sharmila S., Abhilash S., Borah N., Chattopadhyay R., Pillai P.A., Rajeevan M., Arun Kumar, North Indian heavy rainfall event during June 2013: diagnostics and extended range prediction, Climate Dynamics, 44, May 2015, DOI:10.1007/s00382-014-2291-5, 2049-2065 . ISSN 0930-7575.

48. Joseph S., Sahai A.K., Abhilash S., Chattopadhyay R., Borah N., Mapes B.E., Rajeevan M., Kumar A., Development and evaluation of an objective criterion for the Real-Time prediction of Indian Summer Monsoon onset in a coupled model framework, Journal of Climate, 28, August 2015, DOI:10.1175/JCLI-D-14- 00842.1, 6234-6248. ISSN 0894-8755.

47. Borah N., Sahai A. K., Abhilash S., Chattopadhyay R. , Joseph S., Sharmila S., Kumar A., Assessment of real-time extended range forecast of 2013 Indian summer monsoon, International Journal of Climatology, 35, October 2015, I:10.1002/joc.4178, 2860-2876. ISSN 0899-8418.

46. Abhilash S., Sahai A.K., Borah N., Joseph S., Chattopadhyay R., Sharmila S., Rajeevan M., Mapes B.E., Kumar A., Improved Spread–Error Relationship and Probabilistic Prediction from the CFS-Based Grand Ensemble Prediction System, Journal of Applied Meteorology and Climatology, 54, July 2015, DOI:10.1175/JAMC-D-14-0200.1, 1569-1578. ISSN 1558-8424.

45. Abhilash S., Sahai A.K., Borah N., Joseph S., Chattopadhyay R., Sharmila S., Rajeevan M., Mapes B.E., Kumar A., Better spread-error relationship in a multimodel ensemble prediction system, Bulletin of the American Meteorological Society, 96, August 2015, 1228-1229. ISSN 0273-0979.

44. Sahai A.K., Chattopadhyay R., Joseph S., Abhilash S., Borah N., Goswami B.N., New method to compute the principal components from self-organizing maps: an application to monsoon intraseasonal oscillations, International Journal of Climatology, 34, July 2014, DOI:10.1002/joc.3885, 2925–2939. 0899-8418.

43. Pillai P.A., Sahai A.K., Moist dynamics of active/break cycle of Indian summer monsoon rainfall from NCEPR2 and MERRA reanalysis, International Journal of Climatology, 34, June 2014, DOI:10.1002/joc.3774, 1429–1444. ISSN 0899-8418.

42. Mandke S.K., Sahai A.K., Shinde M., Dynamical Seasonal Prediction of Indian Summer Monsoon using AGCM: Weighted Ensemble Mean Approach, Earth Science India, 7, July 2014, 67-72

41. Abhilash S., Sahai A.K., Borah N., Chattopadhyay R., Joseph S., Sharmila S., De S., Goswami B.N., Arun Kumar, Prediction and monitoring of monsoon intraseasonal oscillations over Indian monsoon region in an ensemble prediction system using CFSv2, Climate Dynamics, 42, May 2014, DOI:10.1007/s00382-013-2045-9, 2801- 2815. ISSN 0930-7575.

40. Abhilash S., Sahai A.K., Borah N., Chattopadhyay R., Joseph S., Sharmila S., De S., Goswami B.N, Does bias correction in the forecasted SST improve the extended range prediction skill of active-break spells of Indian summer monsoon rainfall?, Atmospheric Science Letters, 15, June 2014, DOI:10.1002/asl2.477, 114–119. ISN 1530-261X

39. Abhilash S., Sahai A. K., Pattnaik S., Goswami B.N., Arun Kumar, Extended range prediction of active-break spells of Indian summer monsoon rainfall using an ensemble prediction system in NCEP Climate Forecast System, International Journal of Climatology, 34, January 2014, DOI:10.1002/joc.3668, 98-11. ISN 0899-8418.

38. Sharmila Sur, Pillai P.A., Joseph S., Roxy M., Krishna R.P.M., Chattopadhyay R., Abhilash S., Sahai A.K., Goswami B.N., Role of ocean-atmosphere interaction on northward propagation of Indian summer monsoon intra-seasonal oscillations (MISO), Climate Dynamics, 41, September 2013, DOI:10.1007/s00382-013-1854- 1, 1651–1669. . ISSN 0930-7575.

37. Sahai A.K., Sharmila S., Abhilash S., Chattopadhyay R., Borah N., Krishna R.P.M., Joseph Susmitha, Roxy M., De S., Pattnaik S., Pillai P.A., Simulation and Extended range prediction of Monsoon Intraseasonal Oscillations in NCEP CFS/GFS version 2 framework, Current Science, 104, May 2013, 1394-1408. ISSN 0011-3891.

36. Pattnaik S., Abhilash S., De S., Sahai A.K., Phani R., Goswami B.N., Influence of convective parameterization on the systematic errors of Climate Forecast System (CFS) model over the Indian monsoon region from an extended range forecast perspective, Climate Dynamics, 41, July 2013, DOI:10.1007/s00382-013-1662-7, 341–365. ISSN 0930-7575.

35. De S., Sahai A.K., Predictability of Indian monsoon circulation with high resolution ECMWF model in the perspective of tropical forecast during the tropical convection year 2008, Pure and Applied Geophysics, 170, December 2013, DOI:10.1007/s00024-013-0642-5, 2351–2368. ISSN 0033-4553.

34. Chattopadhyay R., Sur S., Joseph S., Sahai A.K., Diabatic heating profiles over the continental convergence zone during the monsoon active spells, Climate Dynamics, 41, July 2013, DOI:10.1007/s00382-013-1739-3, 205-226. ISSN 0930- 7575.

33. Borah N., Sahai A.K., Chattopadhyay R., Joseph S., Abhilash S., Goswami B.N., Self-organizing map-based ensemble forecast system for extended range prediction of active/break cycles of Indian summer monsoon, Journal of Geophysical Research, 118, August 2013, DOI:10.1002/jgrd.50688, 1-13. ISSN 0148-0227.

32. Abhilash S., Sahai A.K., Pattnaik S., De S., Predictability during active break phases of Indian summer monsoon in an ensemble prediction system using climate forecast system, Journal of Atmospheric and Solar Terrestrial Physics, 100-101, August 2013, DOI:10.1016/j.jastp.2013.03.017, 13-23. ISSN 0021-9169.

31. Terray P., Kamala K., Masson S., Madec G., Sahai A.K., Luo J-J, Role of the intra- daily SST variability in the Indian monsoon variability and monsoon-ENSO-IOD relationships in a global coupled model, Climate Dynamics, 39, August 2012, DOI:10.1007/s00382-011-1240-9, 729-754. ISSN 0930-7575.

30. Manoj M.G., Devara P.C.S., Joseph S., Sahai A.K., Aerosol indirect effect during the aberrant Indian summer monsoon breaks of 2009, Atmospheric Environment, 60, December 2012, DOI:10.1016/j.atmosenv.2012.06.007, 153- 163. ISSN 1352-2310.

29. Joseph S., Sahai A.K., Goswami B.N., Terray P., Masson S., Luo J.-J., Possible role of warm SST bias in the simulation of boreal summer monsoon in SINTEX-F2 coupled model, Climate Dynamics, 38, April 2012, DOI 10.1007/s00382-011- 1264-1, 1561-1576. ISSN 0930-7575.

28. Abhilash S., Sahai A.K., Mohankumar K., George J.P., Das S., Assimilation of doppler weather radar radial velocity and reflectivity observations in WRF- 3DVAR system for short-range forecasting of convective storms, Pure and Applied Geophysics, 169, December 2012, DOI:10.1007/s00024-012-0462-z, 2047-2070. ISSN 0033-4553.

27. Pradhan P.K., Preethi B., Ashok K., Krishnan R., Sahai A.K., Modoki, Indian Ocean Dipole, and western North Pacific typhoons: Possible implications for extreme events, Journal of Geophysical Research, 116, September 2011, doi:10.1029/2011JD015666, D18108, 1-12. ISSN 0148-0227.

26. Joseph S., Sahai A.K., Chattopadhyay R., Goswami B.N., Can El Niño–Southern Oscillation (ENSO) events modulate intraseasonal oscillations of Indian summer monsoon?, Journal of Geophysical Research, 116, October 2011, doi:10.1029/2010JD015510, D20123, 1-12. ISSN 0148-0227.

25. Susmitha Joseph, Sahai A. K. and Goswami, B. N. (2010) Boreal summer intraseasonal oscillations and seasonal Indian monsoon prediction in DEMETER coupled models, Clim. Dyn., 35, 651-667. ISSN 0930-7575.

24. R. Chattopadhyay, Goswami B.N., Sahai A. K. and Fraedrich K. (2009 )The Role of Stratiform Rainfall in modifying the northward propagation of Monsoon Intraseasonal Oscillation, J. Geo. Res. (Atmos.), 114, D19114, DOI 10.1029/2009JD011869, 1-15. ISSN 0148–0227.

23. Susmitha Joseph, Sahai A. K. and Goswami, B. N. (2009) Eastward propagating MJO during boreal summer and Indian monsoon droughts, Clim. Dyn., 32, 1139- 1153. ISSN 0930-7575.

22. Sahai A. K., Chattopadhyay R. and Goswami B. N. (2008) A SST based large multi-model ensemble forecasting system for Indian summer monsoon rainfall, Geo. Res. Let., 35, L19705,1-9, DOI 10.1029/2008/GL035461. ISSN 0094-8276.

21. Chattopadhyay R., Sahai A. K. and Goswami B. N. (2008) Objective Identification of Nonlinear Convectively Coupled Phases of Monsoon Intraseasonal Oscillation: Implications for Prediction, J. Atmos. Sci., 65, 1549- 1569. ISSN 1520-0469.

20. Suresh Babu D. S., Sahai A. K., Mauricio A. N. and E. Marone (2008) Hydraulic response of a tidally forced coastal creek, Pontal do Parana, Brazil, Hydrogeology Journal, DOI 10.1007/s10040-008-0334-x. ISSN 1431-2174.

19. Pankaj Kumar, K. Rupa Kumar, M. Rajeevan and Sahai A. K. (2007), On the recent strengthening of the relationship between ENSO and northeast monsoon rainfall over south Asia, Clim. Dyn., 28, 649-660. ISSN 0930-7575.

18. Mandke S. K., Sahai A. K., Shinde M. A., Joseph S. and Chattopadhyay R. (2007) Simulated changes in active/break spells during Indian summer monsoon due to enhanced CO2 concentrations: Assessment from selected Coupled Atmosphere-Ocean global climate model, International Journal of Climatology, 27, June 2007, 837-859, DOI: 10.1002/joc.1440. ISSN 0899-8418. www.interscience.wiley.com 

17. Grimm A. M., Sahai A. K. and C. F. Ropelewski (2006), Interdecadal Variations in AGCM Simulation Skills, J. Clim., 19, 3406-3419. ISSN 0894-8755.

16. K. Rupa Kumar, Sahai A. K., K. Krishna Kumar,S. K. Patwardhan, P. K. Mishra, J. V. Revedekar, K. Kamla and G. B. Pant (2006), High-resolution climate change scenarios for India, Curr. Sci., 9(3), 334-345. ISSN 0011-3891.

15. Tripathi K. C., Das I. M. L. and Sahai A. K. (2006) Prediction of sea surface temperature anomalies in the Indian Ocean using artificial neural network, Ind. J. Mar. Sci.,35(3), 210-220. ISSN 0379-5136.

14. Sahai, A. K., Patnaik, D. R., Satyan, V. And Grimm, A. M. (2003) Teleconnections in Recent Time and Prediction of Indian Summer Monsoon Rainfall, Met. Atmos. Phys., 84, 217-227. ISSN 0177-7971.

13. Sahai A. K., Grimm A. M., Satyan V. and Pant, G. B. (2003) Long- lead Prediction of Indian Summer Monsoon Rainfall from Global SST Evolution, Clim. Dyn., 20, 855-863. ISSN 0930-7575.

12. Sahai A. K. (2001) Some aspects of mathematical modelling of Himalayan and Trans- Himalayan glaciers and Indian summer monsoon, Proc. Nat. Acad. Sci., India, Vol. 71(A), SPL. ISSUE, 237-242. ISSN 0369-8203.

11. Sahai A. K., Soman, M. K. and Satyan, V. (2000) All India summer monsoon rainfall prediction using an artificial neural network, Clim. Dyn., 16, 291- 302. ISSN 0930-7575.

10. Sahai A. K. (1999) A brief review of Climate Change: Causes, Observations and Modelling Studies, Proc. Nat. Acad. Sci. India (Section A - Physical Sciences), 69(A), I, 1-17. ISSN 0369-8203.

9. Sahai A.K. (1998) Climate Change: A Case Study over India, Theo. Appl. Climatol. 61, 9-18. ISSN 0177-798X.

8. Sahai A. K. (1998) Thermosolutal convection in the presence of both vertical and horizontal temperature gradients, ASME J. Appl. Mech., Vol. 66, 181-196. ISSN 0021-8936.

7. Srivastava, Atul Kumar, Sahai A. K. and Khare, H. C. (1998) Effect of vertical magnetic field on Rayilegh- Taylor instability in porous medium, J. Ind. Math. Soc., Vol. 65, 133- 143. ISSN 0019-5839.

6. Sahai A. K. (1997) Instability of two superposed self-gravitating viscous streams, Arabian J. for Sc. and Eng. Vol. 22(2A), 213-221. ISSN 0377-9211.

5. Khare H.C. and Sahai A. K. (1995) Thermosolutal convection in a rotating heterogeneous fluid layer in porous medium, Proc. Nat. Acad. Sc. India Vol. 65(A), I, 49-62. ISSN 0369-8203.

4. Khare H.C. and Sahai A.K. (1994) Thermosolutal convection in a rotating heterogeneous fluid layer in porous medium in the presence of magnetic field, J. Ind. Math. Soc. Vol. 60, 247-265. ISSN 0019-5839.

3. Khare H. C. and Sahai A. K. (1993) Thermosolutal convection in a heterogeneous fluid layer in porous medium in the presence of magnetic field, Int. J. of Eng. Sc. Vol. 31 No. 11, 1507-1517. ISSN 0020-7225.

2. Khare H.C., Singh R.P., Sahai  A. K. and Singh P.K. (1992)  Thermosolutal Instability of a non-homogeneous fluid layer, Ganita, Vol. 43, 147-169. ISSN 0046-5402.

1. Khare H.C and Sahai A.K. (1992) Thermosolutal convection in a heterogeneous fluid layer in porous medium, Proc. Nat. Acad. Sc. India, Vol. 63(A), IV, 673-688. ISSN 0369-8203.


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Papers Published in Proceedings/Books/Reports etc.  


  1. Sahai A. K. (2009) Challenges in Real Time Seasonal prediction: a Plea for Enhanced Scientific Rigor, APCC News Letter, Vol.4, No.1, 3-6.
  2. Sahai, A. K., Mandke, S. K., Shinde, M. A., Chattopadhyay, R., Joseph S. and Goswami, B. N. (2007) Experimental seasonal forecast of Indian summer monsoon 2007: statistical and dynamical models, IITM Research Report, No. RR- 120. ISSN 0252-1075.
  3. Mandke S. K., Sahai A. K., Shinde M. A., Joseph S. and Chattopadhyay R. (2006) Coupled multi-model response of active and break phases of Indian summer monsoon to enhanced CO2 effect, IITM Research Report, No. RR- 112. ISSN 0252-1075.
  4. Mandke S. K., Sahai A. K., Shinde M. A. and Joseph S. (2006) Global warming and mean Indian summer monsoon, Working Group on Numerical Experimentation (WGNE) report, March 2006, pp.
  5. Sahai, A. K. and R. Chattopadhyay (2006) An objective study of Indian summer monsoon variability using the self organizing map algorithms, IITM Research Report, No. RR- 113. ISSN 0252-1075.
  6. Grimm A. M., Sahai A. K. and C. F. Ropelewski (2006), Variations in Global Climate model performance for different regions, seasons, variables and climate regimes, Geoph. Res. Abs., vol. 8, 10051, SRef-ID: 1607-7962/gra/EGU06-A-10051, European Geosciences Union.
  7. Mandke S. K., Sahai A. K. and Shinde M. A. (2005) Dynamical ensemble seasonal forecast experiments of recent Indian summer monsoons: an assessment using new approach. IITM Research Report, No. RR-107. ISSN 0252-1075.
  8. Mujumdar M., Krishnan R., Sahai A. K., Mandke S. K., Kulkarni J. R., Shinde M., Vinay Kumar, Kripalani R. H. and Sabade S. S. (2005) Monsoon 2004 - performance of LRF: global modelling aspects. Leeward News, Vol.IX(No.4), Spl. Issue, pp. 5-7.
  9. Sahai, A. K., Sujata K. Mandke, R. Krishnan, Vinay Kumar, M. Mujumdar, J. R. Kulkarni and S. P. Gharge (2004), Statistical and Dynamical Prediction of Summer Monsoon 2003, Leeward News, Vol VII(No.4), pp.15-21.
  10. Sahai A. K., RupaKumar K., Mishra P. K., Patwardhan S. K. (2004) South Asian climate change scenario. Proceedings of the workshop on Adaptation to climate change in mountain ecosystems: bridging research and policy, 3-4 March, 2004, Kathmandu, Nepal, pp2.1-2.29.
  11. Sahai, A. K., Grimm, A. M., Satyan, V. and Pant, G. B. (2002) Prospects of prediction of Indian summer monsoon rainfall using global SST anomalies, IITM Research Report, No. RR-093. ISSN 0252-1075.
  12. D.S. Suresh Babu, M. Noenberg, A. K. Sahai and E. Marone (2002) Hydraulic response of a coastal aquifer holding tidal creek from Pontal do Parana, Brazil. Project Report, UFPR, Curitiba, Brazil, August 2002.
  13. V. Satyan, M. K. Soman, R. Krishnan, J. R. Kulkarni, Sahai A. K., S. K. Mandke, K. Ashok, M. Mujumdar and D. R. Pattanaik (2002) Climate predictability and variability studies using atmospheric general circulation models, research highlights in earth science system, Indian Geological Congress (special vol.1), pp.311-324.
  14. Grimm, A. M., Sahai, A. K., Ferraz, S. E. T. and Soares A. P. (2001) Rainfall forecast in a region of the Sao Francisco basin using neural network. Proceedings of the fourth Inter-American Dialogue on Water Management. Ministério do Meio Ambiente, 2001. v. in CD.
  15. Krishnan, R., Satyan, V., Mujumdar, M., Mandke, S. K., Kulkarni, J. R., Sahai, A. K., Gharge, S. P., Vaidya, V., Ramesh K. V. and Vinay Kumar (2001) Ensemble GCM simulations of the Indian summer monsoon, Report No. 31, WMO/TD No. 1064, 2001, pp. 6.5-6.6.
  16. Satyan, V., Keshavamurty, R. N., Soman, M. K., Krishnan, R., Kulkarni, J. R., Ashok, K., Mandke, S. K., Mujumdar, M., Pattanaik, D. R., Venkatesan, C., Gharge, S. P. and Sahai, A. K. (2000) Monsoon Predictability and variability studies using atmospheric general circulation models, SERC Research Highlights 2000, DST Publication 2000, pp 96-104. 212-215.
  17. Sahai, A. K. and Satyan, V. (2000) Reduction of AGCM systematic error by artificial neural network: A new approach for dynamical seasonal prediction of Indian summer monsoon rainfall, IITM Research Report, No. RR088 ISSN 0252-1075.
  18. Satyan, V., Krishnan, R., Soman, M. K., Kulkarni, J. R., Sahai, A. K., Ashok, K., Mandke ,S. K. and Mujumdar, M. (2000) Simulation of surface wind stress on monthly and seasonal time scales to provide forcings for driving an ocean general circulation model, Report No. 30, WMO/TD No. 987, 2000, pp 8.15.
  19. Sahai, A. K., Mujumdar, M., Soman, M. K. and Satyan, V. (2000) Prediction of All India Summer Monsoon Rainfall using Neural Network, in Proceedings of TROPMET-2000, pp 212-215.

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IITM Research reports

5. Chattopadhyay R., Krishna R. P. M., Joseph S., Dey A., Mandal R. and Sahai A. K., A Comparison of Extended - Range Prediction of Monsoon in the IITM - CFSv2 with ECMWF S2S Forecast System, IITM Research Report, RR-139, January 2017, ESSO/IITM/SERP/ SR/01 (2018)/190. 

 

4. Susmitha Joseph, R. Mandal, A. K. Sahai, R . Phani, A . Dey and R. Chattopadhyay, Diagnostics and Real - Time Extended Range Prediction of Heat Waves over India, IITM Research Report, RR - 141 ESSO / IITM / SERP / SR / 03 ( 2018 )/ 192. 

 

3. Susmitha Joseph, A. K. Sahai, R. Phani, R. Mandal, A. Dey and R. Chattopadhyay, Evaluation of Extended Range Forecast Skill on Subdivisional scale over India, IITM Research Report No. RR- 137, ESSO/IITM/SERP/SR/01(2017)/188, published May 2017

 

2. D.R. Pattanaik, Raju Mandal, Avijit Dey, R. Phani, Susmitha Joseph, Rajib Chattopadhyay, Shibin Balakrishnan and A. K. Sahai, Performance of real time extended range forecast during southwest monsoon 2016, IMD Met Monograph: No.: ESSO/ IMD/ Synoptic Met./ 01(2017)/21

 

1.  Sahai A.K., Chattopadhyay, Rajib, Dey Avijit, Joseph Susmitha, Abhilash S., Phani M., Mandal Raju, Rajeevan M.N. and Hendon H., MJO Diagnostics for Extended Range Prediction and Simulation in IITM CFSv2”, IITM Research Report, RR-136, September 2016

 

 

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Papers Presented in Seminar/Symposia

  1. Sahai, A. K., Prediction of active and break phases of monsoon intraseasonal oscillation, Brainstorming Workshop-SW monsoon 2010 performance review, 9-10 Dec, 2010, IMD, New Delhi.
  2. Sahai, A. K., Silver Jubilee Award lecture 2008, IITM Foundation Day Celeberation on 17th November 2010 at IITM.
  3. Sahai, A. K., Extended range monsoon prediction using Atmospheric GCMs, Asia Pacific Network South Asia -SRC, PDWT and Downscaling Workshop: IITM, Pune, November 03-05, 2010
  4. Sahai, A. K., Prediction of monsoon 2010: seasonal forecasting of Indian summer monsoon using empirical models, SASCOF meeting 13-15 April, 2010.
  5. Sahai, A. K., Seasonal and Intra-seasonal Forecasting of Indian Summer Monsoon Using Empirical/Dynamical Models, Annual workshop on Monsoon 2009, Indian Meteorological Society (Pune Chapter), Pune, 16th December, 2009.
  6. Sahai, A. K., Challenges in real-time prediction of seasonaol anomalies, Seminar at APCC, Busan, Korea on 13th March, 2009.
  7. Sahai, A. K., Problems and prospects in predicting inter-annual and intra-seasonal variabilities, Seminar at KMA, Seol, Korea on 4th March, 2009.
  8. Sahai, A. K., A new approach for objective Identification of Nonlinear Convectively Coupled Phases of Monsoon Intraseasonal Oscillation: implications for Prediction, Seminar at APCC, Busan, Korea on 24th February, 2009.
  9. Sahai, A. K., A new approach to predict inter-annual variability of Indian Summer Monsoon Rainfall, Seminar at APCC, Busan, Korea on 6th Jan, 2009.
  10. Susmitha Joseph, A. K. Sahai and B. N. Goswami, Eastward propagating MJO and Indian summer monsoon droughts, Conference on Teleconnections in the Atmosphere and Oceans at The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy. (For Poster Presentation) during 17-20th November 2008.
  11. Sahai, A. K., A SST based large multi-model ensemble forecasting system for Indian summer monsoon rainfall, Seminar at the Department of Meteorology, Florida State University, USA 30th August, 2008.
  12. Sahai, A. K., Objective Classification of Rainfall Patterns: A non-linear approach and Extended range prediction of monsoon, Seminar at the Department of Meteorology, Florida State University, USA, 30th Ausust, 2008.
  13. Susmitha Joseph, A. K. Sahai and B. N. Goswami, Eastward Propogating MJO during boreal summer and Indian monsoon droughts.Western Pacific Geophysics Meeting, Cairns, Australia, 29 July to 1st Aug. 2008.
  14. Sahai, A. K., S. K. Mandke, M. Shinde, R. Chattopadhyay, Susmitha Joseph, B. N. Goswami,S. M. Bawiskar, S. S. Dugam and A. A. Munot Seasonal Forecast of ISMR 2007, MoES Brainstorming meeting for ‘Improved Weather Forecasting’, held during 26-28 February, 2008 at Meeting Hall, First Floor, WWF-India, 172-B, Lodi Estate, New Delhi.
  15. Sahai, A. K., S. K. Mandke, M. Shinde, R. Chattopadhyay, Susmitha Joseph, B. N. Goswami,S. M. Bawiskar, S. S. Dugam and A. A. Munot, Statistical and Dynamical Seasonal Forecast of ISMR 2007, 2nd annual workshop on “Model performances for 2007 weather system” held at NCMRWF, New Delhi during 31 Jan-01 Feb 2008.
  16. Sahai, A. K., Sujata Mandke, Mahesh Shinde, R. Chattopadhyay, Susmitha Joseph and B. N. Goswami, Experimental Seasonal Forecast of Indian Summer Monsoon 2007: Statistical and Dynamical Models., Annual workshop on Monsoon 2007, Indian Meteorological Society (Pune Chapter), Pune, 3rd December, 2007.
  17. R. Chattopadyay, A. K. Sahai and B. N. Goswami., The prediction of intra-seasonal oscillation: A clue to have pre-information of extreme rainfall events., UK India Extreme Weather Events Conference, New Delhi, 26 -29 November 2007.
  18. Sahai, A. K., Global Warming.Presented (by Dr. Suresh Tiwari) at 16th All India Scientific Hindi Workshop at New Delhi on 12th Nov. 2007.
  19. Mahesh Shinde, A. K. Sahai and S. K. Mandke, Dynamical Seasonal Prediction of Indian Summer Monsoon Rainfall : Need of Coupled Model?, International Conference on Asian Monsoon Variability during the past Global Changes, Nainital, India held during 11-14 Sept. 2007.
  20. R. Chattopadyay, Sahai, A. K. and B. N. Goswami, A link between large scale dynamical Indian and the event to event variability of Active Break Phases of Indian monsoon. International Monsoon Conference, 24-28 July 2007 at IISc, Banglore.
  21. Sahai, A. K., R.Chattopadhyay and B.N. Goswami, A non-linear analog technique of forecasting monsoon rainfall in the extended range using the large, scale dynamical information and spatial distribution of rainfall, International Monsoon Conference, 24-28 July 2007 at IISc, Banglore.
  22. Susmitha Joseph, A. K. Sahai and B. N. Goswami, Eastward propagating MJO during boreal Summer and Indian monsoon droughts, International Monsoon Conference, 24-28 July 2007 at IISc, Banglore.
  23. Sahai, A. K., Prediction of Monsoon – 2007 : Seasonal Forecasting of Indian Summer Monsoon using Imperical/Dynamical approaches, Meeting on Long Range Forecasting, 13th April 2007, held at IMD, New Delhi.
  24. A.K.Sahai Climate System Modelling at IITM: HPC needs and issues of number crunching. (Invited talk), International High Performance Computing (HPC) Users
    Conference, held at IIT, Delhi, during 28 Feb- 1 March 2007.
  25. Sahai, A. K., Seasonal prediction of monsoon 2006 - dynamical and statistical approach, Brain storming meeting for improved weather forecasting during 6-8 Feb.2007, at New Delhi.
  26. Sahai, A. K., Statistical and Dynamical Prediction of Monsoon 2006., Meeting on “Model performances during monsoon 2006 period”, NCMRWF, New Delhi, 19 Dec. 2006.
  27. R. Chattopadhyay, A. K. Sahai and B. N. Goswami, Understanding the Multiple Degeneracy of the Spatial Pattern of Active and Break Phases of Monsoon (Poster Presentation), TROPMET-2006 held at IITM during 21-23 November 2006.
  28. Susmitha Joseph, A. K. Sahai and B. N. Goswami, Relation between MJO and long breaks. TROPMET-2006 held at IITM during 21-23 November 2006.
  29. Mandke Sujata K., Sahai, A. K., M.A. Shinde, Susmitha Joseph and R. Chattopadhay, Simulated changes in active/break spells during Indian Summer Monsoon due to enhanced CO2 concentrations : Assessment from selected coupled atmosphere-ocean global climate models (Poster presentation), Tropmet-2006, a national symposium on ‘Role of meteorology in national development’, held during 21-23 November, 2006 at IITM, Pune.
  30. Sahai, A. K., Long range forecasting 2006, India Meteorological Department, Dept of Science and Technology, New Delhi, 22 April 2006.
  31. Sahai, A. K., Seasonal Forecasting of Indian Summer Monsoon Using Empirical/ Dynamical Approaches, India Meteorological Department, Dept of Science and Technology, New Delhi, 23 March 2006.
  32. R. Krishnan, J.R. Kulkarni, Sahai, A. K., Sujata Mandke, Milind Mujumdar., Coupled air-sea interactions in the tropical Indian Ocean and monsoon environment, International Geosphere Biosphere Workshop on Global Change, 3 March 2006, IITM,Pune, India.
  33. Susmitha Joseph, A. K. Sahai and S.K. Mandke, Study of Indian summer monsoon long break spells          National Conference on Atmosphere Ocean Interaction and monsoon variability, Department of Atmospheric Sciences, Cochin University of Science and Technology, Kochi, 11-13 January, 2006.
  34. Sahai, A. K. and R. Chattopadhyay, The study of Indian summer monsoon intraseasonal variability and objective classification of rainfall patterns using self organizing maps, ERCA-2006, Grenoble, France, (9th Jan to 11th Feb, 2006).
  35. R. Chattopadhyay and Sahai, A. K., ISO variability study and the objective classification of rainfall patterns; a non linear approach, IITM seminar, 20th December, 2005.
  36. Sahai, A. K., S. K. Mandke, Mahesh Shinde, R. Krishnan, M. Mujumdar, Vinay Kumar, J.R. Kulkarni and S.P. Gharge, Dynamical and statistical prediction experiments: Monsoon 2005, Annual workshop, “Monsoon 2005” organised by Indian Meteorological society, Pune chapter on 23rd December 2005 at central training institute, Pashan.
  37. Sahai, A. K., Silver Jubilee Award lecture- 2003, IITM Foundation Day Celeberation on 17th November 2005 at IITM.
  38. Sushmita Joseph, Sujata K. Mandke and A. K. Sahai, Study and classification of Indian summer monsoon break spells based on OLR, First Prof.Ananthakrishnan Memorial Conference,   held at IITM, Pune during 18-19 Jan. 2005.
  39. R. Chattopadhyay and Sahai, A. K., Wavelet Analysis of Tropical convection over space and time, First Prof.Ananthakrishnan Memorial Conference, held at IITM, Pune during 18-19 Jan. 2005.
  40. Sahai, A. K., S. K. Mandke and M. A. Shinde, Assessment of ensemble dynamical seasonal prediction of recent monsoons by an AGCM,       International Conference ‘MONEX and its legacy’ held at New Delhi during 3-7 Feb. 2005.
  41. R. Krishnan, M. Mujumdar, A. K. Sahai, S.K. Mandke, M. Shinde, J.R. Kulkarni, S.P. Gharge, Vinay Kumar, S.Suchitra, B.K. Samala, Dynamical seasonal prediction experiments of the Indian summer monsoon at IITM, Brainstorming Meeting on Modelling and Prediction over Indian Monsoon Region-Vision 2015 held at NCMRWF, New Delhi during 1-2 February, 2005.
  42. M.Mujumdar, R.Krishnan, A. K. Sahai, S.K.Mandke, J.R.Kulkarni, M.Shinde, Vinay Kumar, R.H.Kripalani and S.S. Sabade, Monsoon 2004 - Performance of LRF : Global Modelling Aspects, Indian Meteorological Society Meeting , Pune Chapter, on 4th March 2005 held at Central training Institute, IMD and IITM, Pashan, Pune.
  43. Mandke S. K., Sahai A. K., R. Krishnan, Role of Indian and Pacific Ocean on ISM of 1997, in the workshop on ‘Climate Variability in 20th Century’ held at ICTP, Trieste, Italy during 19.4.2004 to 02.5.2004.
  44. Grimm, A. M. and Sahai A. K., Interdecadal variations in AGCM  simulation skills, Combined Preprints of the 84th American Meteorological Society Annual Meeting, (CD, P1.30), 11-15 January 2004, Seattle, Washington, USA, American Meteorological Society.
  45. Grimm, A. M., Sahai A. K. and C. F. Ropelewski, Interdecadal variability and the performance of climate models, at the First International CLIVAR Science Conference (DVD, paper DP-9), 21-25 June 2004, Baltimore, USA, CLIVAR Project Office, NOAA.
  46. Grimm, A. M., Sahai, A. K. and Ropelewski, C. F., Long-term variations in the performance of climate models, at the 3rd Brazilian Symposium of Atmospheric Modeling, in the 13th Brazilian Congress of Meteorology, 30 August-3 September, 2004, Fortaleza, State of Ceara, Brazil.
  47. Grimm, A. M., Álvaro Emílio Leite and Sahai, A. K., PREVISÃO DE PRECIPITAÇÃO SAZONAL PARA A BACIA DO RIO PARANAÍBA UTILIZANDO UM MODELO LINEAR, at the 3rd Brazilian Symposium of Atmospheric Modeling, in the 13th Brazilian Congress of Meteorology, 30 August-3 September, 2004, Fortaleza, State of Ceara, Brazil.
  48. Sahai, A. K., Sujata K. Mandke, R. Krishnan, M. A. Shinde and S. P. Gharge, Dynamical and Statistical Prediction of Indian Summer Monsoon- 2002 and 2003, in workshop on extended range Monsoon Prediction[ERMP], 16-17 March 2004, Space Applications Centre, Ahmedabad, India.
  49. Sahai, A. K, K. Rupa Kumar, P. K. Mishra and S. K. Patwardhan, South Asian Regional Climate Scenario, in Adaptation to climate change in mountain ecosystem: Bridging research and policy, 3-5 March, 2004, Kathmandu, Nepal.
  50. Sahai, A. K., Experiment forecast of Indian summer monsoon rainfall: 2002 and 2003, in International workshop of Role of Indian Ocean in Climate Variability over India (INDOCLIM), 23-27 February, 2004, IITM, India.
  51. Grimm, A. M. and Sahai, A. K, Interdecadal variations in AGCM simulation skills, , in International workshop of Role of Indian Ocean in Climate Variability over India (INDOCLIM), 23-27 February, 2004, IITM, India.
  52. Sujata K. Mandke, Sahai, A. K. and R. Krishnan, Influence of SST anomalies over Indian ocean and Pacific ocean on the Indian summer monsoon of 1997, in International workshop of Role of Indian Ocean in Climate Variability over India (INDOCLIM), 23-27 February, 2004, IITM, India.
  53. K. Rupa Kumar, Sahai, A. K, K. Krishna Kumar, S. K. Patwardhan and P. K. Mishra, High resolution climate change scenarios for India, in International workshop of Role of Indian Ocean in Climate Variability over India (INDOCLIM), 23-27 February, 2004, IITM, India.
  54. S. K. Patwardhan, P. K. Mishra, K. Krishna Kumar, A. K. Sahai and K. Rupa Kumar, Cyclonic disturbances as simulated by PRECIS and comparison with observed disturbances over Indian region, in International workshop of Role of Indian Ocean in Climate Variability over India (INDOCLIM), 23-27 February, 2004, IITM, India.
  55. Sahai, A. K., Sujata K. Mandke, R. Krishnan, Vinay Kumar, M. Mujumdar, J. R. Kulkarni and S. P. Gharge, Statistical and Dynamical Prediction of Summer Monsoon 2003, Monsoon-2003 Workshop, 29 January 2004, Indian Meteorological Society, Pune Chapter.
  56. Sahai A. K., A new approach to Monsoon Prediction, IITM-IRI Workshop on seasonal climate and crop forecasting methods for south Indian rainfed agriculture, 12-16 May, 2003, Indian Institute of Tropical Meteorology, Pune.
  57. Grimm, A. M. Grimm, Sahai, A. K., Ferraz, S. E. T. and Soares A. P., Rainfall forecast in a region of the Sao Francisco basin using neural network, in Fourth Inter-American Dialogue on Water Management, Foz do Iguaçu, 2001.
  58. Sahai, A. K., Some aspects of mathematical modeling of Himalayan and Trans- Himalayan glaciers and Indian summer monsoon, Brain storming session on Mathematical Modeling for Glacier Studies, held during 25-26 Aug. 2000, at G. B. Pant Social Science Institute, Allahabad and organised by the National Academy of Sciences, India.
  59. Sahai, A. K., Mujumdar, M., Soman, M. K. and Satyan, V., Prediction of all India summer monsoon rainfall using neural network, TROPMET-2000 symposium in Cochin, India, 2000.
  60. Sahai, A. K., Prediction of all India summer monsoon rainfall using neural network, January, 2000, IITM seminar.
  61. Sahai, A. K., Soman, M. K. and Satyan, V., Prediction of Indian Summer Monsoon Rainfall on seasonal and monthly scales: A neural network approach, TROPMET-99, a symposium on 'Meteorology beyond 2000' held at Regional Meteorological Center, Chennai, India, 1999.
  62. Sahai, A. K., Use of an artificial neural network in Prediction of Indian Summer Monsoon Rainfall on monthly and seasonal scales and variability in predictability, February, 1999, IITM seminar.
  63. Sahai, A. K., Differential changes in maximum and minimum temperatures in Nagpur, a seminar for the project work of Advanced Meteorological Training, IMD, India, 1997.
  64. Sahai, A. K., Thermosolutal convection in the presence of both vertical and horizontal temperature gradients, in 60th Conference of Indian Mathematical Society, India, held at the University of Pune, India, 1994.
  65. Sahai, A. K., Thermosolutal convection in a rotating heterogeneous fluid layer in porous medium, in 62nd session of the National Academy of Sciences, India, 1993, held at Mohanlal Sukhadia University, Udaipur. 
  66. Sahai, A. K., Instability of two superposed self-gravitating viscous streams, in 59th Conference of Indian Mathematical Society, India, 1993, held at the Babasaheb Bhimrao Ambedkar Bihar University, Muzaffarpur.
  67. Sahai, A. K., Thermosolutal convection in a heterogeneous fluid layer in porous medium, in the Diamond Jubilee session of the National Academy of Sciences, India, held at Allahabad, 1991.

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