Modeling Insights into Precipitation Deuterium Excess as an Indicator of Raindrop Evaporation in Lanzhou, China
2021
Fenli Chen | Mingjun Zhang | Athanassios A. Argiriou | Shengjie Wang | Qian Ma | Xin Zhou | Xixi Wu | Jufan Chen
The deuterium excess in precipitation is an effective indicator to assess the existence of sub-cloud evaporation of raindrops. Based on the synchronous measurements of stable isotopes of hydrogen and oxygen (&delta:2H and &delta:18O) in precipitation for several sites in Lanzhou, western China, spanning for approximately four years, the variations of deuterium excess between the ground and the cloud base are evaluated by using a one-box Stewart model. The deuterium excess difference below the cloud base during summer (&minus:17.82&permil: in Anning, &minus:11.76&permil: in Yuzhong, &minus:21.18&permil: in Gaolan and &minus:12.41&permil: in Yongdeng) is greater than that in other seasons, and difference in winter is weak due to the low temperature. The variations of deuterium excess in precipitation due to below-cloud evaporation are examined for each sampling site and year. The results are useful to understand the modification of raindrop isotope composition below the cloud base at a city scale, and the quantitative methods provide a case study for a semi-arid region at the monsoon margin.
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