Rain evaporation and moist patches in tropical boundary layers
Rain evaporation and moist patches in tropical boundary layers
复制标题
热带边界层的降雨蒸发和湿斑
DOI：
10.1002/2016gl070893
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发表时间：
2016
影响因子：
5.2
通讯作者：
Z. Kuang
中科院分区：
文献类型：
--
作者：
G. Torri;Z. Kuang
湿斑是亚云层中与环境相比具有正水蒸气异常特征的区域，被认为对于触发新的对流单元很重要。因此，正确理解这些斑块中水蒸气的来源对于改进现有的对流参数化至关重要。最近的研究解决了这个问题，并表明与之前的想法相反，湿斑中水蒸气的主要来源是地表潜热通量，而不是雨水蒸发。这份手稿为该主题提供了不同的视角，仅关注水蒸气的起源，与环境相比，水蒸气使潮湿的斑块异常潮湿。研究发现，在地表附近，雨水蒸发的贡献是潜热通量的一半，这意味着热力学强迫的参数化应该对环境变量（如相对湿度）比最近建议的更敏感。
Moist patches are areas in the subcloud layer characterized by a positive water vapor anomaly compared to the environment and are considered important in triggering new convective cells. A correct understanding of the origin of the water vapor in these patches is, thus, essential to improving existing convective parameterizations. Recent studies have addressed this problem and have shown that contrary to what was previously thought, the main source of water vapor in moist patches are surface latent heat fluxes, instead of rain evaporation. This manuscript offers a different perspective to the topic, focusing on the origin only of the water vapor that makes moist patches anomalously moist when compared to the environment. It is found that near the surface, rain evaporation contributes half as much as latent heat fluxes, implying that a parameterization of the thermodynamic forcing should be more sensitive to environmental variables, like relative humidity, than recently suggested.