Decadal long convection-permitting regional climate simulations over eastern China: evaluation of diurnal cycle of precipitation
Decadal long convection-permitting regional climate simulations over eastern China: evaluation of diurnal cycle of precipitation
复制标题
中国东部十年长对流区域气候模拟：降水日循环评估
DOI：
10.1007/s00382-019-05061-z
复制
发表时间：
2020
期刊：
影响因子：
4.6
通讯作者：
Jianping Tang
中科院分区：
文献类型：
--
作者：
Ziyue Guo;Juan Fang;Xuguang Sun;Jie Tang;Yi Yang;Jianping Tang
利用对流允许分辨率（4 km）的天气研究与预报模式（WRF_CPM）对1998-2010年中国东部地区10 a长时段气候进行模拟，分析了中国东部地区降水量（PA）、降水频率（PF）和降水强度（PI）的日变化特征及其与大尺度大气环流的关系。将模拟结果与CN05.1、CMORPH v1.0和ECMWF再分析中期（ERAIN）进行进一步比较。结果表明，WRF_CPM能较好地反映实测季节降水和大气环流。在亚日尺度上，WRF_CPM在再现PF日振幅方面具有上级优势，在空间分布上与PA相似。此外，夏季PF和PA在三个子区域，即，WRF_CPM能较好地再现华北、江淮和华南地区的气候特征。观测到的降水系统表现出明显的从高原向下游的东传播，这可能是由于与低层异常风和水汽辐合相关的螺线管环流。然而，它们几乎被WRF_CPM高估，从而导致高估沿沿着YHR的降水。WRF_CPM的清晨降水比CMORPH的大，这与高估夜间低空急流有关。而由于太阳加热和海陆风的影响，午后降水峰值主要沿着中国东部沿海地区，与WRF_CPM的垂直运动相匹配。
With a decadal long period (1998–2010) climate simulation using the Weather Research and Forecasting model at convection-permitting resolution (4 km) (WRF_CPM), the diurnal cycles of precipitation amount (PA), frequency (PF) and intensity (PI) and their related large-scale atmospheric circulations over eastern China are analyzed. The simulations are further compared against the CN05.1, CMORPH v1.0 and the ECMWF Re-Analysis Interim (ERAIN). Results show that WRF_CPM can reasonably represent the observed seasonal rainfall and the atmospheric circulations. As for the features at a sub-daily scale, WRF_CPM is superior at reproducing the diurnal amplitude of PF that is similar to PA in terms of the spatial distribution. Moreover, the diurnal peak timing of summer PF and PA over the three sub-regions, i.e., North China (NC), Yangtze-Huaihe River basin (YHR) and South China (SC), can be properly reproduced by WRF_CPM. The observed precipitation systems exhibit obvious eastward propagation from the Plateau to its downstream, which may be due to the solenoid circulations associated with the low-level anomalous wind and moisture convergence. However, they are almost overestimated by WRF_CPM and in turn causing overestimated precipitation along YHR. The early morning precipitation in WRF_CPM has a larger fraction than CMORPH, which is related to the overestimated nocturnal low-level jet. Whereas, due to the solar heating and the land-sea breezes, the late-afternoon precipitation peak is mainly located along the coasts of eastern China, which matches well with the vertical motion in WRF_CPM.