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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
Recent trends in tropospheric temperature over India during the period 1971-2015
This paper focused on regional variability in annual and seasonal tropospheric temperature trends during the period 1971-2015 by using the 19 radiosonde stations data.The linear trends in surface and the tropospheric temperatures at five selected isobaric levels (850, 700, 500, 200 and 150 hPa) were examined for all-India, North India and South India. Increasing trend in annual temperatures were observed from surface to 500 hPa levels, but decreasing from 200 to 150 hPa over South India whereas, North India shows an increasing trend at all the levels. The highest increasing trends of 0.36°C and 0.27°C per decade were observed at 700 hPa over North and South India during the winter season, respectively. Annual mean temperature series of North and South India show a significant increasing trend at only surface and 700 hPa level. At the surface, annual mean temperature of South India shows higher increasing trend (0.19°C/decade) than that of the North India (0.17°C/decade). While, at 700 hPa, the reverse is observed, North India temperature shows higher trend of 0.25°C than the South India temperature trend of 0.15°C per decade(Kothawale D.R., Singh H.N., Earth and Space Science, May 2017)
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)
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.