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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
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)
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)
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)
New Publications
Assessment of simulation of radiation in NCEP Climate Forecasting System (CFS V2)
Goswami T., Suryachandra A. Rao, Hazra A., Chaudhari H.S., Dhakate A., Salunke K., Mahapatra S., Atmospheric Research, 193, September 2017
Surface ozone characterization at Larsemann Hills and Maitri, Antarctica
Ali K., Trivedi D.K., Sahu S.K., Science of the Total Environment, 584-585, April 2017
Effect of cloud microphysics on Indian summer monsoon precipitating clouds: A coupled climate modeling study
Hazra A., Chaudhari H.S., Saha Subodh K., Pokhrel S., Journal of Geophysical Research, 122, March 2017
Seasonal prediction of summer monsoon rainfall over cluster regions of India
Kakade S.B., Kulkarni Ashwini, Journal of Earth System Science, 126, April 2017
IITM Events
Earth Day 2017 Celebration at IITM
Indian Institute of Tropical Meteorology (IITM), Pune celebrated Earth Day on 22 April 2017. As a part of the celebrations, Climate Quiz, Drawing, Elocution, Skit / Mono-act play competitions were held for the school children of various age groups.
Workshop on Lightning and Extreme Weather Events
Training Workshop on Lightning and Extreme Weather Events, 4-7 April 2017
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’.
INDO-US Workshop on Downscaling
International Workshop on "Development and Applications of Downscaling Climate Projections" during 7-9 March 2017.