Large-Scale Controls on Extreme Precipitation
Large-Scale Controls on Extreme Precipitation
复制标题
DOI：
10.1175/jcli-d-16-0381.1
复制
发表时间：
2017-02-01
影响因子：
4.9
通讯作者：
Siebesma, A. Pier
中科院分区：
文献类型：
--
作者：
Loriaux, Jessica M.;Lenderink, Geert;Siebesma, A. Pier
大涡模拟与强大的横向强迫降水在荷兰的代表进行调查的稳定性，相对湿度（RH），和水分收敛对降水的影响。此外，一个简单的气候扰动被用来分析降水对温度升高的响应。对降水进行分解，区分影响降水落区和降水强度的过程。结果表明，水汽辐合的增强和大气的不稳定性都能导致降水的增加，但作用不同：大气稳定性主要影响降水强度，而水汽辐合主要控制降水面积分数。极端降水强度对大气稳定度和水汽辐合的敏感性在性质上相似。降水量随着相对湿度的增加而增加，这是由于面积分数的增加，尽管强度有所下降。降水对气候扰动的响应表现出对降水强度的响应比对总降水的响应更强，对大气稳定度、水汽辐合和相对湿度的变化没有明显的依赖性。
Large-eddy simulations with strong lateral forcing representative of precipitation over the Netherlands are performed to investigate the influence of stability, relative humidity (RH), and moisture convergence on precipitation. Furthermore, a simple climate perturbation is applied to analyze the precipitation response to increasing temperatures. Precipitation is decomposed to distinguish between processes affecting the precipitating area and the precipitation intensity. It is shown that amplification of the moisture convergence and destabilization of the atmosphere both lead to an increase in precipitation, but on account of different effects: atmospheric stability mainly influences the precipitation intensity, whereas the moisture convergence mainly controls the precipitation area fraction. Extreme precipitation intensities show qualitatively similar sensitivities to atmospheric stability and moisture convergence. Precipitation increases with RH due to an increase in area fraction, despite a decrease in intensity. The precipitation response to the climate perturbation shows a stronger response for the precipitation intensity than the overall precipitation, with no clear dependency on changes in atmospheric stability, moisture convergence, and relative humidity.