Water vapor transport and dehydration above convective outflow during Asian monsoon
Water vapor transport and dehydration above convective outflow during Asian monsoon
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DOI：
10.1029/2008gl035441
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发表时间：
2008-10
影响因子：
5.2
通讯作者：
R. James;M. Bonazzola;B. Legras;K. Surbled;S. Fueglistaler
中科院分区：
文献类型：
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作者：
R. James;M. Bonazzola;B. Legras;K. Surbled;S. Fueglistaler
我们研究了大尺度输送和对流在确定亚洲季风区100 hPa水汽极大值中的各自作用。本研究使用ECMWF ERA-Interim加热率的后向轨迹。它包括简单的微观物理与过饱和，并考虑到对流源的基础上，CLAUS数据与简单的参数化过冲。在亚洲地区，重建的水汽和观测结果之间有很好的一致性。研究发现，属于水汽最大值的包裹首先被孟加拉湾和中国海的对流抬升，然后通过季风反气旋环流穿过热带对流层顶（TTL）向印度西北部输送，最终在那里脱水，避免TTL的最低温度。对流增湿约占0.3 ppmv在亚洲季风区和超调没有显着的影响，水汽收支。
We investigate the respective roles of large‐scale transport and convection in determining the water vapor maximum at 100 hPa in the Asian monsoon region. The study uses backward trajectories with ECMWF ERA‐Interim heating rates. It includes simple microphysics with supersaturation and takes into account convective sources based on CLAUS data with a simple parameterization of overshoots. A good agreement between reconstructed water vapor and observations is obtained over Asia. It is found that parcels belonging to the water vapor maximum have been first lifted by convection over the Bay of Bengal and the Sea of China and then transported through the tropical tropopause layer (TTL) via the monsoon anticyclonic circulation towards North‐West India, where they are eventually dehydrated, avoiding the coldest temperatures of the TTL. Convective moistening accounts for about 0.3 ppmv in the Asian monsoon region and overshoots do not have a significant impact on the water vapor budget.