热带气象学报2024，Vol.40Issue(5)：822-833,12.DOI:10.16032/j.issn.1004-4965.2024.071
北京地区边界层低空急流的观测研究
Observed Characteristics of Boundary Layer Low-Level Jet over Beijing Area
摘要
Abstract
Based on two-year routine sounding data and intensive radiosonde data collected at multiple stations from August 28 to September 2,2016,over the Beijing area,this study investigated the relationship between boundary layer low-level jet(BLLJ)and meteorological elements,analyzed the differences in BLLJ characteristics between urban and suburban areas,and briefly explored its formation mechanism.The results show that:(1)The BLLJ in autumn and winter was more frequent,higher,and stronger,and the main jet direction was southerly.In spring and summer,it became less frequent,lower in height,and weaker,and the jet was primarily northerly.(2)The jet was closely related to the vertical structure of the atmospheric boundary layer.In most cases,an elevated inversion layer was observed above the jet.The height of inversion exhibited good consistency with the minimum wind speed above jet height and the wind direction change height.(3)The diurnal variation of potential temperature was similar to the cycle of the BLLJ from its formation to dissipation.The main driver of the nocturnal BLLJ in Beijing was inertial oscillations under clear weather conditions.(4)The difference in BLLJ characteristics between urban and suburban areas was significant.Urban jets were usually abrupt and not coherent,short-lived,and rarely observed.By contrast,suburban jets were frequent and long-lived.In a typical urban jet case,the jet core height was 150 m higher,and the jet intensity was 1.6 m s-1 smaller than those of a suburban jet at the same time.关键词
边界层低空急流/季节特征/悬空逆温/日变化特征/城郊差异Key words
boundary layer low-level jet/seasonal characteristics/elevated inversion layer/diurnal variation/differences between urban and suburban areas分类
天文与地球科学引用本文复制引用
何松蔚,王成刚,严家德,李炬..北京地区边界层低空急流的观测研究[J].热带气象学报,2024,40(5):822-833,12.基金项目
国家自然科学基金面上项目(41975011) （41975011）
国家自然科学基金重点项目(42330608)共同资助 （42330608）
