Temporal Variations of the Winter Mixed Layer South of the Kuroshio Extension
Temporal Variations of the Winter Mixed Layer South of the Kuroshio Extension
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DOI：
10.1007/s10872-010-0012-1
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发表时间：
2010-02-01
影响因子：
2.3
通讯作者：
Iwasaka, Naoto
中科院分区：
文献类型：
--
作者：
Iwamaru, Hikaru;Kobashi, Fumiaki;Iwasaka, Naoto
利用1971-2007年黑潮延伸体南部回流环流温度廓线的月平均时间序列，研究了冬季混合层的时间变化。冬季混合层深度具有年际和年代际变化特征，并与秋末冬初平均地面净热通量变化显著相关。也有一个密切的关系与强度预先存在的地下分层，测量垂直温度梯度在前一个夏天。线性多元回归分析表明，在冬季MLD的变化的一个显着的部分是由地面热通量和层结的强度解释。这两个因素的贡献是可比的。
A monthly mean time series of the temperature profile in the recirculation gyre south of the Kuroshio Extension has been produced for the period 1971-2007 to examine temporal variations of the winter mixed layer. The winter mixed layer depth (MLD) shows both interannual and decadal variations and is significantly correlated with variation of the mean net surface heat flux in late autumn to early winter. There is also a close relation with the strength of pre-existing subsurface stratification, measured as vertical temperature gradients in the preceding summer. Linear multiple regression analysis shows that a significant fraction of the variations in the winter MLD is explained by the surface heat flux and the strength of the stratification. The contribution of the two factors is comparable.