摘要
利用卫星观测的海面高度资料、海表温度资料和再分析大气资料,考察了冬季黑潮延伸体海域云水含量的年际变化。结果表明:尽管大气环流有明显的年际变化,海洋锋对其上云水含量的"锚定"作用(锋面南侧云水含量多,北侧少)始终存在,同时云水量值有明显的年际变化,该变化主要受背景大气环流的影响,当西北风加强(减弱)带来偏冷(暖)偏干(湿)的空气团时,锋面南侧云水少(多)。按照云水含量多少进行合成分析的结果表明:来自大陆的冬季西北风南下,在遇到海洋锋锋南侧的暖水面时,空气抬升导致的大气跨锋面的次级环流和对应锋面南(北)辐合(辐散)在一定程度上(约25%)受背景大气环流变化的影响。在背景大尺度的西北风强(弱)时,大气中水汽含量较少(多),凝结放热较弱(强),黑潮延伸体海洋锋南侧南侧上升,北侧下沉的次级环流偏弱(强)。
The interannual variation features of Cloud Liquid Water （CLW） in winter kuroshio extension region is investigated based on the Sea Surface Height （SSH）, Sea Surface Temperature （SST） from the Satellite observation, and some reanalysis atmospheric variables. It is found that the kuroshio extension SST front anchors the CLW in every year （more in the southern and less in the northern）, and the intera- nnual variation of CLW is due to the large-scale atmospheric circulation, when the northwesterly is strengthened （weaken）, it brings much colder （warmer） and drier （wetter） air mass, and the CLW in south of the SST front is much more （less）. Based on the composition of different CLW years, it shows that when the northwesterly goes down south and encounters the warm side of the SST front, the surface wind which converges （diverges） in south （north） of the front, and the cross-frontal secondary circulation due to uplifting are affected by the large-scale circulation to a certain degree （about 25%）. When the northwesterly is strengthened （weaken）, the water vapor content is less （more）, and the condensation heat transfer is weak （strong）, so that the upward motion in south and downward in north of the SST front is weaken （strengthened）.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第3期7-14,共8页
Periodical of Ocean University of China
基金
国家重大科学研究计划项目(2012CB955602)
国家自然科学基金项目(41176006)资助
关键词
黑潮延伸体
云水含量
大气响应
年际变化
Kuroshio extension
cloud liquid water
atmospheric response
interannual variation
