WINTER OCEAN-ATMOSPHERE INTERACTION IN THE NORTHWEST PACIFIC
WINTER OCEAN-ATMOSPHERE INTERACTION IN THE NORTHWEST PACIFIC
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发表时间：
2006
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通讯作者：
Liu Qin
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作者：
Liu Qin
利用NCAR/NCEP再分析资料（1958-1999）、COADS月资料（1945-1993）和1980-1997年黑潮输送观测资料，研究了冬季台湾东北海域黑潮输送与海气相互作用的关系。首先，我们采用合成分析，以了解简单的对应关系Z500位势高度差在北半球和NWP的净热通量差黑潮输送大的年和黑潮输送小的年份。当大黑潮输送与小黑潮输送差异较大时，数值预报中的净热量将释放到大气中，导致日本东南部至阿留申群岛一带出现大的低压异常。通过奇异值分解（SVD）分析，进一步证实了冬季数值预报中海气相互作用向大气释放净热量，这与数值预报中的低压异常和内蒙古、北美的高压异常相对应。此外，在数值预报中，海气相互作用强的年份在很大程度上对应于黑潮输送量大的年份。将黑潮通量与SVD得到的第一主分量用超前或滞后相关进行关联，发现黑潮输送超前两个月时，与数值预报中的海气相互作用最匹配。总之，我们认为黑潮在数值预报中冬季海气相互作用中起着重要的热量输送作用。也就是说，晚秋黑潮的暖平流维持了数值预报中冬季海气相互作用。
Using the NCAR/NCEP reanalysis (1958—1999), COADS monthly data(1945—1993) and Kuroshio transport observation from various sources covering 1980—1997, we studied mainly the relationship between Kuroshio transport and ocean-atmosphere interaction in the area northeast of Taiwan in Northwest Pacific (NWP) during winter. First, we employed composite analysis to understand simple corresponding relationship between Z500 geopotential height difference in north hemisphere and net heat flux difference in NWP from large Kuroshio transport years to small Kuroshio transport years. When larger Kuroshio transport is very different from smaller Kuroshio transport in the period, the net heat in the NWP would be released to the atmosphere, resulting in the occurrence of large low-pressure anomaly in the areas from southeastern Japan to Aleutian. With singular value decomposition (SVD) analysis, we further confirmed that in winter the air-sea interaction in NWP releases net heat to the atmosphere, which corresponds to the low-pressure anomaly in NWP and high-pressure anomalies in Nei Mongol (Inner Mongolia) and in North America. In addition, the year of strong air-sea interaction in NWP largely corresponds to the year of large Kuroshio transport. Having related the Kuroshio flux to the first principle component obtained with SVD using lead or lag correlation, we discovered that when Kuroshio transport lead by two months, it could best match the air-sea interaction in NWP in winter. In conclusion, we believe that that the Kuroshio plays an important role in winter air-sea interaction in NWP for transporting heat. In other words, the warm advection of the Kuroshio in late fall sustains the winter air-sea interaction in NWP.