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Surf Ocean Digest: Quarterly Newsletter of Ocean Society of India, Pune Chapter at IITM (Vol.4, Iss. 1, Feb. 2017)
IITM Publication Highlights
Winter fog experiment over the Indo-Gangetic plains of India
The objectives of the Winter Fog Experiment (WIFEX) over the Indo-Gangetic Plains of India are to develop better now-casting and forecasting of winter fog on various time- and spatial scales. The microwave radiometer profiles of temperature and liquid water indicate a mini-convective boundary layer structure, which sustained turbulence at the bottom and top of the fog layer. Imminent fog could be identified with the help of equivalent potential temperature at least 2–3 h prior to the event. (Ghude S.D., Bhat G.S., Prabha T., Jenamani R.K., Chate D.M., Safai P.D., Karipot A.K., Konwar M., Pithani P., Sinha V., Rao P.S.P., Dixit S.A., Tiwari S., Todekar K., Varpe S., Srivastava A.K., Bisht D.S., Hazra A., Nigam N., Shende U., Lal D.M., Acharja P., Kulkarni R., Subharthi C., Balaji B., Varghese M., Bera S., Rajeevan M., Current Science, 112, February 2017)
Breakup modes of the drops suspended in a vertical wind tunnel in presence of the horizontal electric field
The influence of strong horizontal electric field (EH) on different stages of deformation and eventual breakup of the large water drops of 6.6, 7.0, and 7.25mm diameter has been observed in avertical wind tunnel using high-speed photography. Dumbbell, filament, and bag modes of drop breakup areobserved when EH = 0. However, drops elongate in horizontal direction, mostly develop sharp curvature attheir ends, eject a fine jet spray of tiny droplets, and ultimately break up into several droplets in EH = 500kVm-1. Extremeelongation up to 29mm is observed for a 7.0mm diameter drop. Results suggest that theeffect of EH in final oscillation before breakup overcomes the effect of hydrodynamic and aerodynamicforces in elongating the drop. Also, no breakup of bag type is observed in EH = 500 kVm-1. Moreover, the fragments formed after the drop breakup and tiny droplets ejected by their fragments carry electrical chargesof polarity determined by the induced charge on the parent drop in EH. The significance of the results isdiscussed in modifying the drop growth and the radar echo-precipitation relationships in thunderclouds. (Bhalwankar R., Deshpande C.G., Kamra A.K., Journal of Geophysical Research, 122, February 2017)
Effects of multilayer snow scheme on the simulation of snow: Offline Noah and coupled with NCEP CFSv2
A multilayer snow scheme is introduced in the Climate Forecast System version 2 (CFSv2) of the NCEP. Many previous observational and modeling studies have identified Eurasian snow as one of the important predictors the Indian summer monsoon rainfall (ISMR). However, CFSv2, which is used by IITM for predicting the monsoon rainfall on sub-seasonal to seasonal time scale, had a large difficulty in simulating the mean snow over Eurasia. This is a completely in-house model development activity and shows promising results in the simulation of snow as well as ISMR. (Saha Subodh K., Sujith K., Pokhrel S., Chaudhari H.S., Hazra A., Journal of Advances in Modeling Earth Systems, 9, January 2017)
New Publications
SST and OLR relationship during Indian summer monsoon: a coupled climate modelling perspective
Chaudhari H.S., Hazra A., Pokhrel S., Chakrabarty Chandrima, Saha Subodh K., Sreenivas P., Meteorology and Atmospheric Physics, online, March 2017
Interannual spring Wyrtki jet variability and its regional impacts
Deshpande A., Gnanaseelan C., Chowdary J.S., Rahul S., Dynamics of Atmosphere and Ocean, 78, June 2017
Cloud-edge mixing: Direct numerical simulation and observations in Indian Monsoon clouds
Bipin Kumar, Bera S., Prabha T.V., Grabowski W., Journal of Advances in Modeling Earth Systems, 9, February 2017
Clouds vertical properties over the Northern Hemisphere monsoon regions from CloudSat-CALIPSO measurements
Das Subrata Kumar, Golhait R.B., Uma K.N., Atm. Res., 183, January 2017
IITM Events
INDO-US Workshop on Downscaling
International Workshop on "Development and Applications of Downscaling Climate Projections" during 7-9 March 2017.
National Science Day 2017 at IITM
IITM celebrated National Science day 2017 on 28th February 2017 at its premises. IITM scientists and researchers demonstrated and explained different aspects of weather and Climate Sciences to the visitors.
IITM Participation at GMRT for Science Day 2017
IITM Participation at Giant Metrewave Radio Telescope (GMRT), Khodad, Narayangaon for Science Day during 28 Feb. - 01 Mar. 2017
INTROSPECT 2017
International Workshop on Representation of Physical Processes in Weather and Climate Models(INTROSPECT 2017), 13-16 February 2017, Indian Institute of Tropical Meteorology, Pune