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 IMPACT OF INTRUSION OF OZONE FROM THE STRATOSPHERE ON THE TROPOSPHERIC OZONE LEVELS IN INDIA Nandita D. Ganguly 1 and Chris Tzanis 2 1 Department of Physics, St. Xavier’s College, Ahmedabad-380009, Gujarat 2 Department of Energy Technology, Technological Educational Institute of Athens, Greece Decrease in stratospheric ozone will result in an amplification of the solar ultraviolet B radiation reaching the ground, which is a threat to the human society. On the other hand, ozone being toxic to the living system and an important contributor to anthropogenic global warming, high levels of tropospheric ozone will have adverse effects on the air quality and climate. Transport of ozone from the stratosphere to the troposphere will cause stratospheric ozone to decrease and tropospheric ozone to increase, which can in turn have serious consequences for life on earth. Stratosphere- Troposphere Exchange (STE) is regarded as an important factor controlling the budget of ozone in the troposphere and lower stratosphere. Study of STE events in India are so far restricted to coordinated campaigns and measurements over longer periods are relatively scarce. The surface ozone levels in some Indian cities have increased significantly in the recent years. In the light of these observations, the paper is aimed to identify the Indian latitudes, which are most likely to be affected by STE, the frequency of occurrence of shallow and deep STE events and the depth up to which stratospheric ozone descends into the troposphere during these events over the period of 24 years. In addition, the contribution of STE events to the observed high surface ozone levels for a number of cities covering north to south of India will be presented. CLIMATE CHANGE AND MONSOONAL RAIN- PRODUCING WEATHER SYSTEMS ACROSS INDIA Nityanand Singh 1 , H.N. Singh 1 and Ashwini A. Ranade 2 1 Indian Institute of Tropical Meteorology, Pune 2 National Centre for Medium Range Weather Forecasting, New Delhi email: nsingh@tropmet.res.in Attempts have been made to understand relationship amongst global warmingcooling, Asian-Indian summer monsoon circulation intensity, El Niño-La Niña in the equatorial central and eastern Pacific Ocean and rainfall across India. During warmer 134
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow troposphere over Afro-Asian highlands, the monsoon is stronger, La Niña condition in the Pacific and intense rainfall across India, while reverse was the changes during cooler troposphere. In recent years, the Asian-Indian monsoon circulation is weaker and rainfall across India because of cooler upper troposphere over Tibet-Himalaya-China- Mongolia-Manchuria sector and warmer lower troposphere over the surrounding water bodies (Pacific, Indian, Atlantic and Southern Oceans). In general, the troposphere over the southern hemisphere is warming at a faster rate due to large water bodies compared to that over northern hemisphere, so there is lesser exchange of the mass-moisture between the two hemispheres. During boreal summer, decreasing trend is seen in the intensity of the general atmospheric circulation over the period 1949-2009. 135
Page 2 and 3:
National Conference on Science of C
Page 4 and 5:
Page 6 and 7:
Page 8 and 9:
Page 10 and 11:
Page 12 and 13:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
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: National Conference on Science of C
Page 147: National Conference on Science of C
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?