Influence of condensate evaporation on water vapor and its stable isotopes in a GCM
Influence of condensate evaporation on water vapor and its stable isotopes in a GCM
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DOI：
10.1029/2009gl038091
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发表时间：
2009-06
影响因子：
5.2
通讯作者：
Jonathon S. Wright;A. Sobel;G. Schmidt
中科院分区：
文献类型：
--
作者：
Jonathon S. Wright;A. Sobel;G. Schmidt
在一个气候模式中评估了凝结水蒸发对大气水汽及其同位素组成的直接影响。该模型包含两个平行的水文循环，一个是影响模型物理和动力学的主动循环，一个是影响模型物理和动力学的被动循环。两个模型进行模拟，其中一个被动云和降水可以蒸发，其中一个不能。两个模拟中的活跃水文循环以及模拟的环流和温度是相同的。消除被动冷凝蒸发可将被动循环中的比湿度降低约5%;根据位置的不同，降低幅度从控制值的百分之几到25%不等。对流层中低层纬向平均水汽相对于对照个例HDO富集，对流层高层纬向平均水汽相对贫乏。
The direct effect of condensate evaporation on atmospheric water vapor and its isotopic composition is assessed in a climate model. The model contains two parallel hydrologic cycles, an active one which influences the model physics and dynamics and a passive one which does not. Two model simulations are performed, one in which passive cloud and precipitation can evaporate and one in which they cannot. The active hydrologic cycles, and thus the simulated circulations and temperatures, are identical in both simulations. Eliminating passive condensate evaporation reduces the specific humidity in the passive cycle by around 5%; this reduction varies from a few percent to 25% of the control value, depending on location. Zonal mean water vapor in the lower and middle troposphere is enriched in HDO relative to the control case, and is depleted in the upper troposphere.