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ȯɽ�ԡ�Vinu K V (������ǥ�ֺ� D2)
�ꡡ�ܡ�A study on the Drought Condition of 2002 Indian Summer Monsoon
ȯɽ�ԡ����� ���� (��۴��ϳعֺ� ����)
�ꡡ�ܡ�Structure of the Circulation Induced by a Shoaling Topographic Wave
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A study on the Drought Condition of 2002 Indian Summer Monsoon (Vinu K V) ȯɽ�� :
2002 Indian Summer Monsoon is characterised by its extended drought during July. The climate model fails to predict this unusual drought event, not only catching the unprecedented media attention, but also putting a challenge with a case difficult to predict. Moisture convergence and availability from the ocean over the Arabian Sea are studied with a focus on its role in the drought condition of 2002 summer monsoon, and results are compared with the other years. Low level moisture over the Arabian Sea anomalously diverges through out the monsoon season, with a special characteristic in July 2002, while sustained and organized moisture convergence is an indication of a good rainfall. Moisture convergence (divergence) over the Arabian Sea is highly correlated with the rainfall. Inter-annual variability of wind-induced moisture convergence (divergence) dominates in total horizontal moisture convergence (divergence) over moisture advection. Moisture supply from the Arabian Sea during May and June 2002 was higher compared to that of the other drought years since 1972, however the drought condition rapidly developed in July. Anomalous divergence of wind over the Arabian Sea is found in July 2002, which led to a decrease in surface wind and shallowing moisture transport across the western coast of India. This divergence seems to be the special event which took place in the 2002 summer monsoon and was in coherent with the reduction in rainfall, and it is proposed as a consequential event of the reversal of the Hadley cell over the tropical Indian Ocean. The study reveals out that, the drought conditions over the Arabian Seas of 2002 is odd one from other drought years since 1972. In addition to that, a positive feedback between the air sea coupling over the Arabian Sea is found on the earlier stages of this drastic drought, which sheds light into the probable failure of the climate models in forecasting this extreme drought.
Structure of the Circulation Induced by a Shoaling Topographic Wave (���� ����) ȯɽ�� :
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