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 wasteland. A manganese spoil dump at Gumgaon, Nagpur India was reclaimed by phytomitigation. Increase in SOC level of reclaimed site was compared with a native forestland and agricultural land after 20 years of reclamation. And results found that forest land showed highest SOC level followed by reclaimed land, and agricultural land. Soil profile studies of all three sites showed that SOC pool decreased from 0–15, 15– 30, and 30–45 cm depths. Although the SOC content of reclaimed land was less than forestland, it showed better SOC accumulation rate. Phytomitigation of mine lands is cost-effective option for decreasing CO 2 concentration. MODELING OF REGIONAL HYDROCLIMATE CHANGE OVER THE INDIAN SUBCONTINENT: IMPACT OF THE EXPANDING THAR DESERT Sumant Nigam University of Maryland, Massimo Bollasina, Princeton University. The Thar Desert between northwestern India and Pakistan is the most densely populated desert region in the world, and the vast surrounding areas are affected by rapid soil degradation and vegetation loss. The impact of an expanded desert (implemented by changing vegetation type and related greenness fraction, albedo, surface roughness length, emissivity, among others) on the South Asian summer monsoon hydroclimate is investigated by means of 7-month, 4-member ensemble sensitivity experiments with the Weather Research and Forecasting model. It is found that extended desertification significantly affects the monsoon at local and large scales. Locally, the atmospheric water cycle weakens because precipitation, evaporation, and atmospheric moisture convergence all decrease; soil moisture and runoff reduce too. Air temperature cools because of an increase in albedo (the desert makes the area brighter) and a reduction of surface turbulent fluxes; the cooling is partially offset by adiabatic descent, generated to maintain thermodynamic balance and originating at the northern flank of the low-level anticyclone forced by desert subsidence. Regionally, an anomalous northwesterly flow over the Indo-Gangetic Plain weakens the monsoon circulation over northeastern India, causing precipitation to decrease and the formation of an anomalous anticyclone in the region. As a result, the middle troposphere cools because of a decrease in latent heat release, but the ground heats up because of a reduction in cloudiness. At larger scale, the interaction between the anomalous circulation and the mountains leads to an increase in precipitation over the eastern Himalayas and Indochina. 122
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow The findings of this study reveal that the expansion of the Thar Desert can lead to a pronounced and large-scale impact on summer monsoon hydroclimate, with a potential to redistribute precious water over South Asia. RECENT CHANGES IN THE CIRCULATION PARAMETERS AND THEIR ASSOCIATION WITH INDIAN SUMMER MONSOON RAINFALL S.D. Bansod Indian Institute of Tropical Meteorology, Pune The phenomena of Earth’s climate system and its associated rainfall are mainly driven by the changes in various circulation parameters embedded with the local atmospheric instability. In this context, an attempt has been made in the present study to examine the recent changes in the regional circulation parameters viz., zonal wind at 200 hPa level over Tibetan Anticyclone region (TA U200 ), zonal wind at 100 hPa over peninsular India i.e. Tropical Easterly Jet (TEJ U100 ), meridional wind (Somali Jet) at 850 hPa over Somali Coast (SJ V850 ) and meridional wind at 850 hPa over Arabian Sea (AS V850 ) using NCEP/NCAR reanalysis dataset during the period 1949-2008. The influences of these circulation parameters in the Indian summer monsoon rainfall (ISMR) have also been brought out. The circulation parameters AS V850 and TEJ U100 show decreasing tendency which in turn leads to the weakening of the moisture transport mechanism over the Indian sub-continent during the monsoon season whereas the other parameters TA U200 and SJ V850 show increasing tendency. TEJ U100 shows significant decreasing trends throughout the monsoon months and season with a very strong positive relationship with monthly ISMR. The intensity of the TA U200 on monthly scale seems to have less impact than those of the other parameters on ISMR during the warming scenario though it plays a vital role in modulating the general atmospheric circulation. The most significant recent changes have also been noticed for TEJ U100 and SJ V850 throughout monsoon months. 123
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: National Conference on Science of C
Page 135: National Conference on Science of C
Page 149: 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?