moisture recycling,precipitation contribution proportion,spatial distribution,isotopic mixing model,LMDZ model,arid region Northwest China ,"/> <p class="MsoPlainText"> <span>Contribution of Moisture Recycling to Precipitation in the Arid Region in </span><span>Northwest China Based on LMDZ Model</span>

Arid Zone Research ›› 2019, Vol. 36 ›› Issue (1): 29-43.

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Contribution of Moisture Recycling to Precipitation in the Arid Region in Northwest China Based on LMDZ Model

YU Xiu-xiu1, ZHANG Ming-jun1, WANG Sheng-jie 1,2,3, QIU Xue1, DU Ming xia1, ZHOU Sue1, MENG Hong-fei1   

  1. 1. College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,Gansu,China;2. Key Laboratory for Ecology and Environment of Riverine Wetlands in Shaanxi Province,Weinan 714099,Shaanxi,China;3. Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,Xinjiang,China

  • Received:2018-07-16 Revised:2018-09-30 Online:2019-01-15 Published:2019-01-17

Abstract:

As an important link in the process of land water cycle,the contribution of local moisture recycling to precipitation in the arid region in northwest China cannot be ignored although its absolute amount is relatively limited. Based on the isotopic data simulated by LMDZ simulations,the spatiotemporal distribution characteristics and mechanism of the contribution proportion of recycled moisture during the period from 1979 to 2007 in the arid region in northwest China were analyzed by the isotopic mixing model.Results showed that the monthly and interannual contribution rate of advection moisture to precipitation was obviously higher than that of recycled moisture during the study period,it was high in summer but low in winter,and increased gradually at annual scale.Oppositely,the monthly and interannual contribution rate of recycled moisture to precipitation was relatively low,it was low in summer but high in winter,and decreased year by year (the interannual contribution proportion of plant transpiration moisture increased in winter half year).Spatially,the contribution proportion of advection moisture was different,and it was high in mountainous areas but low in desert plains.The contribution proportion of evaporation vapor was lower than that of plant transpiration vapor in most areas,but it was opposite in some regions.The spatial distribution of the contribution amount of advection vapor and surface evaporation vapor was consistent with its contribution rate,while the contribution amount of plant transpiration vapor was higher in mountainous areas than that in desert plains.

Key words: moisture recycling')">

moisture recycling, precipitation contribution proportion, spatial distribution, isotopic mixing model, LMDZ model, arid region Northwest China