摘要
根据2012年5、11月2次船载GPS探空资料,结合CFSR再分析、OISST海温、沿岸站位L波段雷达数据等,对黄东海海洋大气边界层(MABL)的时空变化特征及影响因子进行了分析。GPS探空数据表明,正的海气温差产生对流边界层,负的为稳定边界层。相比陆地边界层,MABL的日变化很小。5月份,MABL较低,暖区的海气温差大小与MABL高度相关,而冷区风切变的影响较为显著,太阳辐射也能一定程度上影响MABL高度。11月,MABL远高于5月,海气温差、太阳辐射均能影响MABL高度,风切变贡献很小。5月份海洋锋暖水侧的水汽能到达MABL以上,冷水侧水汽则维持在MABL中;11月水汽被限制在MABL以内。通过青岛、洪家站的L波段雷达数据对比,得到沿岸地区的大气边界层具有与MABL相同的季节变化,能够代表黄、东海MABL特征,但日变化更加剧烈,因此在替代研究海上MABL日变化时具有局限性。
This paper studied the temporal and spatial variation of the Marine atmospheric boundary layer （MABL） height over the Yellow-East China Sea based on the ship borne GPS sounding system during two cruises in May and Nov, 2012. GPS sounding data show that the sea-air temperature differ- ence （S-AT） determines the type of MABL, positive temperature difference correspond with convective boundary layers, negative to stable boundary layers. Compared to the terrestrial boundary layer, the di- urnal variation of MABL is smaller. The MABL in May is low, the S-AT and MABL height are highly correlated in the warm zone, wind shear is not shown directly. In the cold zone, S-AT is less effective on the MABL, and wind shear is more significant. Solar radiation can have extent effect on the MABL height. In November, the MABL is much higher than in May, the SAT, solar radiation can affect the height of the MABL, wind shear contributes little. Nov observations indicate that the variation of the synoptic system also have a significant effect on MABL. The CFSR data showed that MABL is the low- est in summer and highest in winter, and the height of MABL determines the height of the humid layer above the sea. Meanwhile, with the background circulation, on the warm flank of the Kuroshio front, the water vapor can break MABL and reach to the troposphere in May. Vapor in Nov is substantially limited to the MABL. The L-band radar soundings of Qingdao and Hongjia station, shows that the at- mospheric boundary layer of the coastal areas has the same seasonal changes with MABL, they are able to represent the main state of the Yellow-East China Sea MABL in seasonal changing. But there are more dramatic changes in diurnal variation, so further researches on the MABL and its impact factors on coastal L-band sounding data have limitations.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第11期1-10,共10页
Periodical of Ocean University of China
基金
国家自然科学基金项目(41175006)
国家重点基础研究发展规划项目(2012CB955602)资助
关键词
海洋大气边界层
GPS探空
海气温差
水汽分布
marine atmospheric boundary layer
GPS sounding
sea-air temperature difference
watervapor distribution
