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Effect of sub-cloud evaporation on the δ^18O of precipitation in Qilian Mountains and Hexi Corridor, China

Research in Cold and Arid Regions 2016年第5期8卷 378-387页

作者： ZongXing Li Qi Feng YaMin Wang JianGuo Li XiaoYan Guo YongGe Li Key Laboratory of Ecohydrology of Inland River Basins/Gansu Hydrology and Water Resources Engineering Research Center Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China Changsha Normal University Changsha Hunan 410100 China

The sub-cloud evaporation effect refers to the evaporation process for raindrops that fall from the cloud base to the ground, which is usually accompanied by depleted light isotopes and enriched heavy isotopes in the precipitation. Based on 461 event-based precipitation samples collected from 12 weather stations in the Qilian Mountains and the Hexi Corridor from May to August of 2013, our results indicated that sub-cloud evaporation has a great influence on the δ^18O of precipitation, especially in small-amount precipitation events. In May, June, July, and August the δ18O composition was enriched by 35%, 26%, 39%, and 41%, respectively, from the cloud base to the ground. This influence clearly strengthened with temperature rise, from the Qilian Mountains to the Hexi Corridor. When falling raindrops are evaporated by 1.0% in the Qilian Mountains and the Hexi Corridor, the composition of δ18O would be enriched by 1.2% and 2.6%, respectively. Temperature dominated the sub-cloud evaporation in the Qilian Mountains, whereas relative humidity controlled it in the Hexi Corridor. These results provide new proofs of the evolutional process of stable isotopes in precipitation in arid regions.

关键词： sub-cloud evaporation precipitation stable isotope Qilian Mountains

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Quantifying recycled moisture fraction in precipitation of an arid region using deuterium excess

Quantifying recycled moisture fraction in precipitation of a...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： YANLONG KONG ZHONGHE PANG KLAUS FROEHLICH Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Viktor-Wittner-Gasse Formerly Isotope Hydrology Section International Atomic Energy Agency

Terrestrial moisture recycling by evapotranspiration has recently been recognised as an important source of precipitation that can be characterised by its isotopic *** to now,this isotope technique has mainly been applied to moisture recycling in some humid regions,including Brazil,Great Lakes in North America and the European *** arid and semi-arid regions,the contribution of transpiration by plants to local moisture recycling can be small,so that evaporation by bare soil and surface water bodies *** that the deuterium excess(d-excess) of evaporated moisture is significantly different from that of the original water,we made an attempt to use this isotopic parameter for estimating moisture recycling in the semi-arid region of Eastern Tianshan,*** measured the d-excess of samples taken from individual precipitation events during a hydrological year from 2003 to 2004 at two Tianshan mountain stations,and we used long-term monthly average values of the d-excess for the station Urumqi,which are available from the International Atomic Energy Agency-World Meteorological Organization(IAEA-WMO) Global Network of Isotopes in Precipitation(GNIP).Since apart from recycling of moisture from the ground, sub-cloud evaporation of falling raindrops also affects the d-excess of precipitation,the measured values had to be corrected for this evaporation *** the selected stations,the sub-cloud evaporation was found to change between 0.1 and 3.8%,and the d-excess decreased linearly with increasing sub-cloud evaporation at about 1.1%0 per 1%change of sub-cloud *** simple mixing between adverted and recycled moisture,the recycled fraction in precipitation has been estimated to be less than 2.0±0.6%for the Tianshan mountain stations and reach values up to 15.0±0.7%in the Urumqi *** article includes a discussion of these findings in the context of water cycling in the studied region.

关键词： deuterium excess moisture recycling sub-cloud evaporation Eastern Tianshan arid region

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