北京城区大气边界层高度的反演研究  

Inversion of Atmospheric Boundary Layer Height in Beijing Urban Area

作　　者：田野 刘旭林 于永涛 孟磊 张龙斌 TIAN Ye;LIU Xulin;YU Yongtao;MENG Lei;ZHANG Longbin(Beijing Municipal Meteorological Observation Center,Beijing Meteorological Service,Beijing 100089)

机构地区：[1]北京市气象探测中心,北京100176

出　　处：《气象科技》2022年第1期9-20,共12页Meteorological Science and Technology

基　　金：北京市气象局科技项目(BMBKJ201701014);北京市自然科学基金资助项目(8204073);北京超大城市气象环境垂直观测及试验研究(2017YFC1501704)共同资助。

摘　　要：采用北京市国家大气探测试验基地2017年5月1日至2019年8月31日的微波辐射计观测结果,通过位温气块法反演了该地区的大气边界层高度,统计其日变化和月际变化特征,并与相应的探空反演结果进行对比。结果表明:日间大气边界层高度的变化特征与日照时长对应关系很好。除热力作用外,边界层高度受地面风速的影响较大,近地面的较强大风对大气边界层高度起到了抬升作用,导致1—4月的夜间边界层高度明显高于其他月。2月、3月、4月、9月和10月的日间大气扩散条件较好,最大边界层高度均超过了3 km。月均最高大气边界层高度为1461 m,月均最低大气边界层高度为242 m。2月的平均边界层高度最高,为943 m,12月的平均边界层高度最低,为426 m。由于7、8月多为降水和多云天气,所以平均边界层高度较低。微波辐射计反演结果与探空反演结果具有较好的一致性,二者的皮尔逊相关系数达到了0.874,均方根误差仅300 m。Through the two-year long-term MicroWave Radiometer(MWR)observations at the Beijing National Atmospheric Observation Test Base,the Atmospheric Boundary Layer(ABL)height in this area is retrieved by the potential temperature parcel method.The diurnal and monthly changes of the ABL height are analyzed.Moreover,the ABL heights retrieved by the MWR and radiosonde sounding are compared.The characteristics of the change in the ABL height during the day have a good relationship with the change of sunshine duration.Besides the thermal effect,the vertical wind velocity influences the ABL height.Stronger winds near the surface play an essential role in raising the ABL height,leading to the height of the nocturnal ABL from January to April being significantly higher than that in other months.Due to good daytime atmospheric diffusion conditions in February,March,April,September,and October,the maximum monthly mean ABL height exceeded 3 km in all these months.The maximum monthly mean daytime ABL height was 1461 m,and the minimum monthly mean nocturnal ABL height was 242 m.The mean monthly ABL height in February was the highest in a year,943 m,and the lowest mean monthly ABL height was in December with a height of 426 m.Since the weather was mostly rainy and cloudy in July and August,the mean monthly ABL height was low in these two months.The inversion results of the MWR data was in good consonance with that of the sounding data.The corresponding Pearson’s correlation coefficient reached 0.874,and the root mean square error was only 300 m.

关 键 词：微波辐射计 大气边界层 探空 反演 日照观测 

分 类 号：P414[天文地球—大气科学及气象学]