太平洋海气界面净热通量的季节、年际和年代际变化

Seasonal,Annual and Decadal Variations of Air-Sea Heat Fluxes in the Northern Pacific Ocean

根据 COADS资料 ,使用经验正交分解 (EOF)等分析方法 ,研究了北太平洋海气热通量的季节、年际和年代际变化特征。分析结果表明 :北太平洋海洋夏季净得热 ,冬季净失热 ,且黑潮及其延伸体区失热最大。净热通量年际变化较明显 ,北太平洋西部模态水形成区冬季净热通量和副热带失热区春季净热通量的年际变化都主要依赖于潜热和感热通量的年际变化。夏季净热通量的低频变化中心在热带 ,冬季低频变化中心在黑潮及其延伸体区。冬季赤道东、西太平洋净热通量异常的年际变化相反 ;在热带北太平洋中部年际变化达到最大。夏季热带太平洋是净热通量异常的年际变化最大的海域 ,沿赤道两侧在 16 5°E处呈偶极子型分布。

Seasonal, annual and decadal variations of air-sea heat-fluxes over the Northern Pacific, ocean are analyzed based on the COADS dataset. The result shows that in North Pacific, ocean surface gains heat in summer and loses heat in winter, the net heat loss reaches its maximum, especially in Kuroshio Extension. In the subtropical western mode, water formation region in winter and the net heat lost zone in tropic in summer,the annual variation of Q net depends mainly on the annual variation of Q lat and Q sen. In both of winter and summer, low-frequency signal of Q net is mainly annual and decadal variations. In summer, the center of low-frequency variation of Q net is in tropic, while in winter it is in Kuroshio Extension. In winter, the annual variation of Q net in Eastern Pacific is opposite to that in western Pacific. The annual variation of Q net reaches its maximum in the central North Pacific. In summer, the annual variation of Q net reaches its maximum in the central North Pacific. In summer, the annual variation of Q net reaches its maximum in the tropical Pacific and has a dipole distribution pattern along the equator.