中国西北地区大气边界层高度变化特征——基于探空资料与ERA-Interim再分析资料  

The Variation Characteristics of Planetary Boundary Layer Height in Northwest China: Based on Radiosonde and ERA-Interim Reanalysis Data

作　　者：赵采玲[1,2] 李耀辉 柳媛普[1] 周甘霖[1] 张铁军 孙旭映[1] ZHAO Cailing;LI Yaohui;LIU Yuanpu;ZHOU Ganlin;ZHANG Tiejun;SUN Xuying(Key Laboratory for Arid Climate Change and Disaster Reduction of Gansu Province,Lanzhou Institute of Arid Meteorology/Northwestern Regional Center of Numerical Weather Prediction,Key Open Laboratory for Arid Climate Change and Disaster Reduction of the China Meteorological Administration,Lanzhou 730000,Gansu,China;Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China)

机构地区：[1]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点开放实验室,西北区域数值预报中心,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院,中国科学院寒旱区陆面过程与气候变化重点实验室,甘肃兰州730000

出　　处：《高原气象》2019年第6期1181-1193,共13页Plateau Meteorology

基　　金：中国干旱气象科学研究计划项目(GYHY201506001);国家自然科学基金项目(91837209,41675015);中国科学院寒旱区陆面过程与气候变化重点实验室开放基金项目(LPCC2016003)

摘　　要：利用中国西北地区2015年9月至2016年8月38个站点L波段探空观测、2016年7月加密探空观测和ERA-Interim边界层高度资料,对比分析了西北地区大气边界层高度变化特征。观测资料表明,在中国西北地区,08:00(北京时,下同)冬季边界层高度最高;20:00春季边界层高度最高,边界层高度从西部到东部有显著降低的趋势。ERA-Interim资料基本能表现出边界层高度的区域分布,但相对于探空观测得到的边界层高度,除夏季20:00外,ERA-Interim再分析资料边界层高度均偏低。全年平均而言,08:00(20:00)偏低160 m(170 m),其中在08:00(20:00),冬季(春季)偏低最显著。08:00边界层高度与低层稳定度、近地层温度和风速相关更加显著;20:00边界层高度与低层稳定度和相对湿度相关更加显著。2016年7月加密观测资料对比表明,ERA-Interim资料的对流(中性)边界层高度显著偏高;低层稳定度、相对湿度偏小,风速偏大可能是造成边界层高度偏高的原因;ERA-Interim资料的稳定边界层高度偏低,与低层稳定度和近地层温度偏低相关,但其影响因素相对更加复杂。The planetary boundary layer height( PBLH) are calculated by using the radiosonde sounding data of 38 L-band operational sites during September 2015 to August 2016 in Northwest China. The radiosonde sounding data of 6 intensive sounding sites are also used. The diurnal and seasonal variations of PBLH have been analyzed by using the radiosonde sounding data and ERA-Interim Daily data. The PBLH-OBS( PBLH derived from of sounding data) shows that in Northwest China,the PBLH-OBS is highest in winter at 08: 00( Beijing time,the same as after). And the PBLH-OBS is highest in spring at 20: 00 and decreased significantly from west to east. Compared to the PBLH-OBS,the PBLH-ERA( PBLH of ERA-Interim Daily data) are all lower except the PBLH of 20: 00 in summer. The annual PBLH are lower 160 m( 170 m) at 08: 00( 20: 00). The PBLH-ERA of 08: 00( 20: 00) is lower significantly in winter( summer). PBLH-ERA can basically show the regional distribution of PBLH in Northwest China. The correlation between the PBLH and the lower tropospheric stability( LST),the near surface temperature( Ts) and the 10 m wind speed( WS) is more significant at 08: 00. And the PBLH is more related to LST and relative humidity( RH) at 20: 00. The intensive sounding data shows that the PBLH-ERA of convective/neutral boundary layer is significantly higher in July 2016. The lower LST,RH and higher WS may be the cause of the higher PBLH-ERA. The stable boundary layer height of PBLH is lower,which is related to lower LST and Ts,but the influencing factors are more complex.

关 键 词：L波段探空 ERA-Interim资料 大气边界层高度 中国西北地区 

分 类 号：P401[天文地球—大气物理学与大气环境]