New Observational Constraints on Warm Rain Processes and Their Climate Implications
New Observational Constraints on Warm Rain Processes and Their Climate Implications
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DOI：
10.1029/2020gl091836
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发表时间：
2021-03
影响因子：
5.2
通讯作者：
Xiquan Dong;Peng Wu;Yuan Wang;B. Xi;Yiyi Huang
中科院分区：
文献类型：
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作者：
Xiquan Dong;Peng Wu;Yuan Wang;B. Xi;Yiyi Huang
低层云对水文循环和地球辐射收支有着深远的影响。然而，在气候模式中真实模拟低云是一个重大挑战。在这里，我们采用新检索的云和毛毛雨微物理特性，以改善微物理方案中的自动转换和吸积参数化。我们发现，新的自动转换（吸积）率贡献的总毛毛雨含水量比原来的方案减少（增加）14%。与卫星模拟结果相比，用原方案模拟的云液态水路径（LWP）和短波云辐射效应与全球平均值吻合较好，但区域差异较大。使用更新方案的模拟结果显示，小雨频率减少了7.3%，LWP增加了10%。更新后的微物理方案解决了大多数气候模型中长期存在的问题，即“降水太频繁和太轻”。
Low stratiform clouds have profound impacts on the hydrological cycle and the Earth’s radiation budget. However, realistic simulation of low clouds in climate models presents a major challenge. Here we employ the newly retrieved cloud and drizzle microphysical properties to improve the autoconversion and accretion parameterizations in a microphysical scheme. We find that the new autoconversion (accretion) rate contributes 14% lower (greater) to total drizzle water content than the original scheme near the cloud top. Compared to satellite results, the simulated cloud liquid water path (LWP) and shortwave cloud radiative effect using the original scheme in a climate model agree well on global average but with large regional differences. Simulations using the updated scheme show a 7.3% decrease in the light rain frequency, and a 10% increase in LWP. The updated microphysics scheme alleviates the long‐lasting problem in most climate models, that is “too frequent and too light precipitation.”