摘要
2015年11月25日黄海上空冷空气爆发,中国北部发生暴雪,西北东南向云街在黄海上空大面积密集分布。为研究垂直热输运的网格大小依赖性是否会对黄海对流云街数值模拟产生影响,本文利用WRF模式,分别采用考虑网格大小依赖性的边界层(PBL)参数化方案和基于非局部K理论闭合的YSU PBL方案对该个例进行数值模拟。结果表明两方案均能较好地再现云街出现区域和盛行风向。由于考虑网格大小依赖性的PBL方案模拟水平滚涡对流和次级环流的能力更强,所模拟的水平垂直速度强度更大,云水混合比更高,促进更多的云得以发展;同时其稳定性参数ζ更小,模拟的水平滚涡对流强度更大。
On November 25 th 2015, the cold air broke out over the Yellow Sea, causing snow storms in the northern China. Cloud streets with NW-SE orientation were densely distributed over the Yellow Sea. In order to study whether the grid size dependence of vertical heat transport will affect the numerical simulation of convective cloud streets over the Yellow Sea, this paper uses the Weather Research and Forecasting(WRF) model with the Planetary Boundary Layer(PBL) parameterization scheme considering grid size dependence and non-local K-type Yonsei University(YSU) PBL scheme to simulate this case, respectively. The results show that both schemes can reproduce the occurrence area and prevailing wind direction of cloud streets. However, due to the stronger robustness in simulating horizontal roll convection and secondary circulation using the PBL scheme considering grid size dependence, the simulated horizontal and vertical velocity intensity is greater, and the cloud water mixing ratio is higher, which enables more clouds to develop. At the same time, its stability parameter ζ is smaller and the simulated horizontal roll convection intensity is greater.
作者
杨依丽雪
袁慧玲
陈勇
YANG Yilixue;YUAN Huiling;CHEN Yong(Key Laboratory of Mesoscale Severe Weather Ministry of Education/School of Atmospheric Sciences,Nanjing University,Nanjing 210023)
出处
《气象科技》
2022年第2期202-213,共12页
Meteorological Science and Technology
基金
国家自然科学基金(42075187)
关键地球物质循环前沿科学中心科研基金(JBGS2102)
中央高校基本科研业务费专项资金(0209-14380097)共同资助。
关键词
对流云街
边界层参数化方案
敏感性试验
黄海
冷空气爆发
水平滚涡对流
convective cloud street
planetary boundary layer parameterization
sensitivity experiment
Yellow Sea
cold air outbreak
horizontal roll convection
