12-14 September, 2011, Lucknow - Earth Science India

More documents

Recommendations

Info

National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow during the recent decades has shown that there is a decreasing trend in the number of convective systems, even though the sea surface temperature (SST) is showing an increasing trend in recent decades (1951-2007). We feel that the environmental parameters such as vertical shear of the horizontal wind between lower and upper troposphere, mid tropospheric humidity and low level relative vorticity all play an equally important role as the oceanic parameters such as SST and oceanic heat content. OCCURRENCE OF EXTREME RAINFALL EVENTS IN GLOBAL WARMING SCENARIO AND SATELLITE INPUTS FOR PRECAUTIONARY MEASURES P. N. Mahajan, Amita A. Prabhu, M. Mahakur and Sathy Nair Indian Institute of Tropical Meteorology, Pune-411 008 In the present scenario of global warming and climate change, extreme rainfall events are observed frequently at various places over the Indian region. Due to occurrence of such unusual phenomenon there is demand from public for precise shortrange forecast to overcome the grievances likely to occur. As we recognize, the major part of Indian land mass is prone to several natural disastrous events with east and west coasts being affected by super cyclonic storms, deep depressions and severe off shore vortices. At present, the focus of disaster management community is increasingly moving towards effective utilization of emerging technologies such as satellite remote sensing for monitoring potential impacts. Here, in the present study, we have highlighted potential utility of satellite data at pixel resolution to get maximum details of convection of any weather system which is not received from operational data of IMD i.e. OLR observations at very high resolution. In our study we have shown how very high resolution OLR data can give indication of major convection for occurrence of extreme rainfall event. Here, especially recent severe weather development cases at Koyana Dam area, Mumbai region and Leh hilly-surroundings are studied to get feedback for early warning. At present, Doppler radar is installed at Navy complex, Mumbai for getting instantaneous information of convection and precipitation rates of any atmospheric system. This will give the range of 400 km from the coast. However, if genesis and development of such system is beyond 400 km then we have to depend upon digitized data obtained from INSAT satellite. In this study, particularly, INSAT pixel data at a high temporal and spatial resolution is used for the unique case of exceptionally heavy rainfall of 26 July 2005 at Santacruz. In case of excessive rainfall event over Santacruz it is seen from the satellite synergy that integrated water vapor (60 mm), cloud liquid 18
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow water content (0.3 mm), deep convection (85 W/m²) and precipitation rates (50 mm/hr) were of maximum value in the region of vortex when TRMM satellite was passing over Mumbai region. Thus we understood that effective utilization of high resolution satellite data could promise to disseminate disastrous information in real time to public to mitigate the damage likely to occur in disaster prone area. WEAKENING OF SUMMER MONSOON RAINFALL OVER CENTRAL NORTHEAST INDIA Ram R. Yadav Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow Indian summer monsoon rainfall (ISMR), contributing around 3/4 th of the annual precipitation is the manifestation of land-sea thermal contrast between the Asian land mass and tropical Indian Ocean. The summer monsoon rains are critical for agriculture, water supply and the general economic well-being of the society. Despite being a most studied phenomena in the tropics there is no consensus on the trend of monsoon in context of the global change. Inconsistency in GCM simulations of ISMR reflects incomplete understanding of the monsoon system. High spatial and temporal variability indicated in instrumental and proxy records underscore the need of high-resolution monsoon records and other variables that drive the monsoon. Distinct inverse relationship between tree ring derived precipitation with dominant winter-spring precipitation signal in the Trans-Himalayan region and summer monsoon rainfall over the central northeast India has been found. The increasing trend in winter-spring precipitation over the 20 th century implies to the ISMR weakening in context of the past seven centuries and is consistent with other proxies from the Himalayan region. If this trend continues, it will have serious implications on water availability and food security of the country. 19
Page 2 and 3: National Conference on Science of C
Page 31: National Conference on Science of C
Page 83 and 84:
National Conference on Science of C
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149:
Page 152 and 153:
show all

12-14 September, 2011, Lucknow - Earth Science India

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?