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Isotopic characterization of dual monsoon precipitation - evidence from Kerala, India

机译：双季风降水的同位素特征-来自印度喀拉拉邦的证据

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摘要

The stable isotopes oxygen-18, deuterium and the radioactive isotope tritium of the precipitation samples collected from Kozhikode, Kerala were analysed from 2005 to 2007 for the isotopic characterization of the rainfall derived from two monsoons in the region. The isotopic composition varied from delta O-18 = -1.33 parts per thousand and delta D = -3.9% in August 2005 to delta O-18 = -5.6 parts per thousand and delta D = -33.42% in June 2007 for the southwest monsoon (June to September) and from delta O-18 = -5.92 parts per thousand and delta D = -31.43 parts per thousand in October 2007 to delta O-18 = -8.64% and delta D = -53.2% in November 2007 for the northeast monsoon (October to January) samples. In addition to the two monsoon derived rainfalls, the region also receives pre-monsoon showers (March to May), whose isotopic composition varies from delta O-18 = -1.54% and delta D = -15.85% in April 2007 to delta O-18 = -10.26% and delta D = -70.92% in April 2005. The tritium content of rainwater was higher in the northeast monsoon period compared to the southwest monsoon period. The tritium level in precipitation was below 5 TU for most of the samples. The rainfall during southwest and the northeast monsoons shows two distinct isotopic signatures which cannot be totally ascribed to the difference in vapour sources but also to the difference in rainout histories of the air masses before reaching Kozhikode. Pre-monsoon rains in Kozhikode lacked any distinct isotope signatures. The tritium level in precipitation supports our observations. Excess tritium in northeast monsoon rains may be due to their origin from higher latitude.
机译：分析了2005年至2007年从喀拉拉邦科泽科德（Kozhikode）收集的降水样品的稳定同位素氧18，氘和放射性同位素is，以表征该地区两个季风带来的降雨的同位素特征。西南季风的同位素组成从2005年8月的O-18 = -1.33千分之一和D D = -3.9％到2007年6月西南季风的O-18 = -5.6千分和D D = -33.42％ （6月至9月），从2007年10月的O-18增量为-5.92千分之和，D D = -31.43千分之至2007年11月的O-18增量为-8.64％，D增量为-53.2％。东北季风（10月至1月）样本。除了两次季风降雨外，该地区还接受季风前阵雨（3月至5月），其同位素组成从2007年4月的O-18 = -1.54％和D = -15.85％到O- 2005年4月，雨水的=含量为18 = -10.26％，δD = -70.92％。东北季风期的雨水中content含量高于西南季风期。对于大多数样品，precipitation中的level水平低于5 TU。西南季风和东北季风期间的降雨显示出两个明显的同位素特征，这些特征既不能完全归因于蒸气源的差异，也不能完全归因于到达科泽科德之前气团的降雨历史。科泽科德的季风前降雨缺乏任何明显的同位素特征。降水中的level水平支持了我们的观察。东北季风雨中的tri过多可能是由于它们来自高纬度地区。

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