Hydrology and Earth System Sciences
www.hydrol-earth-syst-sci.net
1027-5606
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8
1
2004
10.5194/hess-8-115-2004
http://www.hydrol-earth-syst-sci.net/8/115/2004/
http://www.hydrol-earth-syst-sci.net/8/115/2004/hess-8-115-2004.html
http://www.hydrol-earth-syst-sci.net/8/115/2004/hess-8-115-2004.pdf
115
118
0000-00-00
The origin of summer monsoon rainfall at New Delhi by deuterium excess
Hongxi Pang
Yuanqing He
Zhonglin Zhang
Aigang Lu
Juan Gu
Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou 730000, China
Institute of Tibetan Plateau, Chinese Academy of Science, Beijing 100029, China
Email for corresponding author: phx_anu@hotmail.com
The deuterium excess in summer monsoon precipitation, determined from isotopic
measurements(δ<sup>18</sup>O and <δD)
at New Delhi, has been shown to be correlated, negatively, with relative humidity at the
1000 hPa level over the western Arabian Sea. Furthermore, summer rainfall in north-western India
is correlated, positively, with the zonal wind speed at the 1000 hPa level over the western
Arabian Sea, while relative humidity is correlated, negatively, with zonal wind speed at the
same level. It is concluded that evaporation from the western Arabian Sea is a major source of
the summer rainfall at New Delhi.</p>
<p style="line-height: 20px;"><b>Keywords: </b>deuterium excess, relative humidity, origin of precipitation