在EUREC4A期间根据探测冷池
Detecting cold pools from soundings during EUREC4A
摘要：
本文开发了一种新的方法来检测热带海洋上空大气探测的冷池，并将其应用于2020年1月至2月在巴巴多斯南部和东部进行的EUREC 4A实地活动的探测数据。所提出的方法利用了冷池中的空气比其上方的空气密度大这一事实，它导致我们将冷池测深定义为混合层高度小于400 m的那些。我们首先测试这个标准，验证其一致性与地面温度和降水在一个现实的高分辨率模拟在热带大西洋西部。将其应用于EUREC4A数据，我们然后确定7%的EUREC4A下投式探空仪和无线电探空仪作为冷池探测。在两个选定的案例研究中，我们发现，冷池探测符合中尺度云弧和温度下降的地面时间序列。整个活动的统计数据进一步描述了冷池在温度、湿度和风廓线方面的特征。在风切变的存在下，我们特别表明，冷池的蔓延是有利的下切，这表明不饱和下沉气流的向下动量输送。这些结果支持了我们的简单方法在不同环境条件下的鲁棒性，并说明了它为冷池及其环境的表征提供的新见解。
英文摘要：
This paper develops a novel method to detect cold pools from atmospheric soundings over tropical oceans and applies it to sounding data from the EUREC4A field campaign, which took place south and east of Barbados in January-February 2020. The proposed method exploits the fact that the air in a cold pool is denser than the air above it. It leads us to define cold pool soundings as those for which the mixed-layer height is smaller than 400 m. We first test this criterion by verifying its consistency with surface temperature and precipitation in a realistic high-resolution simulation over the western tropical Atlantic. Applying it to EUREC4A data, we then identify 7% of EUREC4A dropsondes and radiosondes as cold pool soundings. In two selected case studies, we find that cold pools soundings coincide with mesoscale cloud arcs and temperature drops in the surface time series. Statistics for the entire campaign further characterize the signature of cold pools in temperature, humidity and wind profiles. In the presence of wind shear, we show in particular that the spreading of cold pools is favored downshear, suggesting downward momentum transport by unsaturated downdrafts. These results support the robustness of our simple method in different environmental conditions and illustrate the new insights it offers for the characterization of cold pools and their environment.
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