Short Range Ensemble Prediction System



Surf Ocean Digest: Quarterly Newsletter of Ocean Society of India, Pune Chapter at IITM (Vol.4, Iss. 1, Feb. 2017)

IITM Publication Highlights

Simultaneous observation of a glory and in-situ microphysical cloud properties

Whilst making airborne measurements of cloud particles, a bright glory was observed on a thin layer cloud. By deliberately flying through this glory-producing cloud on several occasions, cloud particle size distributions were obtained. We found that warm liquid clouds with narrow cloud droplet size distributions are responsible for producing the observed glory. This paper presents these results and compares the results of Mie theory simulations with an image of the glory. (Konwar M., Laven P., T. V. Prabha, Applied Optics, July 2017)

Read More

Atmospheric dynamics and internal processes during organization and intensification of Boreal Summer Intraseasonal Oscillation (BSISO) based on TRMM and reanalyses data

The recent research has revealed a basic understanding of the scale selection and northward propagation of the BSISOs. But the complete understanding about the organization and intensification of BSISOs remains elusive. We have attempted to investigate the dynamical, physical processes, the effect of scale interaction and circulation-heating feedback during the organization and intensification of BSISOs. (Sarkar S., Mukhopadhyay P., Dutta S., International Journal of Climatology, Online, February 2017)

Read More

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)

Read More

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)

Read More

New Publications

Chemical characterization of rainwater at a high-altitude site Nainital in the central Himalayas, India

Bisht D.S., Srivastava A.K., Joshi H., Ram K., Singh N., Naja M., Srivastava M.K., Tiwari S., Environmental Science and Pollution Research, 24, February 2017

PDF Publisher Link

Impact of satellite data assimilation on the predictability of monsoon intraseasonal oscillations in a regional model

Parekh A., Raju A., Chowdary J.S., Gnanaseelan C., Remote Sensing Letters, 8, April 2017

PDF Publisher Link

SMMR-SSM/I derived Greenland Sea ice variability: links with Indian and Korean Monsoons

Prabhu A., Oh J., Kim I-w, Kripalani R.H., Pandithurai G., Climate Dynamics, online, April 2017

PDF Publisher Link

Shift in MONSOON–SST teleconnections in the tropical Indian Ocean and ENSEMBLES climate models fidelity in its simulation

Pradhan M., Yadav R.K., Ramu Dandi A., Srivastava A., Phani M.K., Rao S.A., International Journal of Climatology, 37, April 2017

PDF Publisher Link

IITM Events

Workshop on Lightning and Extreme Weather Events

Training Workshop on Lightning and Extreme Weather Events, 4-7 April 2017

Photo Gallery

World Meteorological Day 2017 at IITM

IITM celebrated World Meteorological day 2017 on 23rd March at its premises. As part of the celebrations, Dr. J.R. Kulkarni (Ex-Scientist and Ex-Prog. Manager of CAIPEEX at IITM) delivered the World Meteorological Day Special Lecture on the theme ‘Understanding Clouds’.

Photo Gallery

INDO-US Workshop on Downscaling

International Workshop on "Development and Applications of Downscaling Climate Projections" during 7-9 March 2017.

Details Photo Gallery

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.

Photo Gallery