贺兰山东麓大气边界层气象条件分析  

Analysis of Meteorological Conditions of Atmospheric Boundary Layer at the Eastern Foot of Helan Mountain

作　　者：舒志亮 陶涛 孙艳桥 Shu Zhiliang;Tao Tao;Sun Yanqiao(Key Laboratory for Meteorological Disaster Monitoring and Early Warning andRisk Management of Characteristic Agriculture in Arid Regions,CMA,NingxiaYinchuan,750002;Ningxia Meteorological Disaster Prevention Technology Center,NingxiaYinchuan,750002;College of Electronic Engineering of Chengdu University of Information Technology,SichuanChengdu,610225)

机构地区：[1]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,宁夏银川750002 [2]宁夏气象灾害防御技术中心,宁夏银川750002 [3]成都信息工程大学电子工程学院,四川成都610225

出　　处：《科技风》2022年第22期89-93,124,共6页

基　　金：宁夏自然科学基金(2020AAC03469);国家自然科学基金(42075073)资助。

摘　　要：贺兰山东麓边界层内各高度层主导风向分布不均;300m高度以下各时次风速随高度递增;各高度平均风速最小值主要出现在清晨和上午各时次。风速廓线指数P对300m高度以下的平均风速在C、D、E、F四类大气稳定度下能较好地拟合实测风速;在300m以下,除A稳定度下风速呈先增大后减小的趋势外,其他大气稳定度下的风速均呈现出快速增大的趋势。大气混合层厚度与气温的变化成正相关,混合层厚度最小值出现在05h,为67.3m,最大值出现在14h,为1124.6m;弱不稳定(C)大气混合层厚度最大,达1144.6m,接下来依次为不稳定大气(B)、中性大气(D)、较稳定大气(E)和稳定大气(F),强不稳定大气(A)的混合层厚度为0m;05h、20h出现了200m和100m的接地逆温。The dominant wind direction is distributed unevenly in the atmosphere boundary layer of eastern foot of Helan Mountain;Under 300 m height,wind speed increases with the increase of altitude;below 1000 meters,the minimum average wind speed of each level occurs mostly in the morning.Within 300 meters height,wind speed profile index in C,D,E,F under the four types of atmospheric stability can be well fit the measured wind speed,and except for A stability,the wind speed showed A trend of first increasing and then decreasing,the wind speed under other atmospheric stability showed a trend of rapid increasing.The atmospheric mixing layer thickness is positively correlated with the temperature change,the minimum thickness of it appeared at 05 h,with a thickness of 67.3 m,and the maximum thickness appeared at 14 h,with a thickness of 1124.6 m.The thickness of the weakly unstable(C)atmospheric mixing layer is the largest,up to 1144.6 m,followed by the unstable atmosphere(B),neutral atmosphere(D),relatively stable atmosphere(E)and stable atmosphere(F),and the thickness of the strongly unstable atmosphere(A)is 0 m.Temperature inversion of 200 m and 100 m appeared at 05 h and 20 h.

关 键 词：大气边界层 混合层厚度 大气不稳定度 贺兰山东麓 

分 类 号：P421.31[天文地球—大气科学及气象学]