热带气象学报2017，Vol.33Issue(1)：93-103,11.DOI:10.16032/j.issn.1004-4965.2017.01.010
2012年南海夏季风活跃期与非活跃期广东电白地区海陆大气边界层特征分析
ANALYSIS OF THE CHARACTERISTICS OF THE LAND-SEA BOUNDARY LAYER OVER THE DIANBAI AREA DURING THE ACTIVE AND INACTIVE PERIODS OF SOUTH CHINA SEA SUMMER MONSOON IN 2012
摘要
Abstract
The characteristics of the land-sea atmospheric boundary layer during the active and inactive periods of the South China Sea Summer Monsoon (SCSSM) are analyzed by using the observation data obtained from the Dianbai meteorological station and the Marine Meteorological Science Experiment Base at Bohe from June to September in 2012.It is found that the structure of the atmospheric boundary layer in the active and inactive periods of SCSSM differs significantly not only above the land but also over the sea.(1) In the active period,A southeast wind dominates during the whole day,which is observed at both the sea and land sites,and the wind speed is relatively high.In contrast,the wind direction in the inactive period changes irregularly,and the wind speed is smaller than that in the active period.Moreover,in the active period,continuous precipitation is observed.As a result,the average daily temperature in the active period within the surface layer over land is reduced by approximately 2 ℃ than that in the inactive period;(2) Based on the sounding data,during the active period,a prevailing southeast wind exists in the boundary layer,and the wind speed of larger than 8 rn/s persists above the altitude of 200 m.However,during the inactive period,the wind speed is relatively small,and the wind direction changes frequently.The deviation of the wind direction between the upper and lower layers of the boundary layer reaches up to 180 degrees in the inactive period.The temporal behavior of the potential temperature vertical profile in the land-type boundary layer is also analyzed.It is shown that the boundary layer height reaches the maximum of 937 m in the inactive period.In contrast,due to the existence of the precipitation and the clouds during the active period the height of the mixing layer decreases heavily.The highest boundary layer found in the active period has the thickness of only about 700m.The sounding data also shows that the relative humidity in the boundary layer during the active period is mostly larger than 80％,which is attributed to the continuous rainfall.The analysis in the present study reveals that the land-sea energy exchange behaves differently in the active and inactive periods of SCSSM.Besides,the characteristics of the structure of the atmospheric boundary layer strongly change as well.关键词
南海夏季风/活跃期/非活跃期/大气边界层/海陆差异Key words
South China Sea Summer Monsoon/monsoon active period/monsoon inactive period/atmospheric boundary layer/land-sea discrepancy分类
天文与地球科学引用本文复制引用
刘潇,王成刚,黄辉军..2012年南海夏季风活跃期与非活跃期广东电白地区海陆大气边界层特征分析[J].热带气象学报,2017,33(1):93-103,11.基金项目
国家自然科学基金项目(41175013) （41175013）
教育部留学回国人员科研启动基金资助项目共同资助 （）
