Modes and mechanisms of sea surface temperature low-frequency variations over the coastal China seas
Modes and mechanisms of sea surface temperature low-frequency variations over the coastal China seas
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DOI：
10.1029/2009jc006025
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发表时间：
2010-08
影响因子：
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通讯作者：
Liping Zhang;Lixin Wu;Xiaopei Lin;Dexing Wu
中科院分区：
文献类型：
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作者：
Liping Zhang;Lixin Wu;Xiaopei Lin;Dexing Wu
本文利用海洋和大气再分析资料，研究了中国沿海年平均海表温度的低频变率。有两种不同的低频模式：盆地模式和南北偶极子模式。前者的特点是整个沿海海洋的均匀升温，而后者的特点是大陆架海和南中国海的跷跷板模式。盆地模式与全球变暖有关，但主要归因于海洋平流，由于潜热损失的加剧，地表热通量起到了阻尼作用。偶极子模与太平洋年代际涛动是相干变化的。与盆地模态相反，偶极子模态与表面热通量广泛相关，海洋平流在陆架海抑制海表温度（SST），而在南海维持海表温度。进一步分析表明，尽管控制过程存在差异，但从年平均海温推导出的盆地模态和偶极子模态在冬季和夏季仍保持稳健。发现夏季偶极子模态与大西洋多年代际涛动有关。因此，中国沿海海温可以作为这些全球尺度气候变化的潜在指标。
[1] In this paper, low-frequency variability of annual-mean sea surface temperature in the coastal China seas is studied based on ocean and atmosphere reanalysis products. There are two distinct low-frequency modes: a basin mode and a north-south dipole mode. The former is characterized by a uniform warming over the entire coastal oceans, while the latter is characterized by a seesaw pattern over the shelf seas and the South China Sea. The basin mode is associated with global warming, but it is primarily attributed to oceanic advection, with surface heat flux playing a damping effect due to intensification of the latent heat loss. The dipole mode varies coherently with the Pacific Decadal Oscillation. In contrast to the basin mode, the dipole mode is broadly associated with the surface heat flux, with oceanic advection acting to damp sea surface temperature (SST) in the shelf seas but sustain SST in the South China Sea. A further analysis indicates that the basin mode and the dipole mode derived from the annual-mean SST remain robust in winter and summer, despite some differences in the governing processes. It is found that the summer dipole mode is associated with the Atlantic Multidecadal Oscillation. Therefore, SST over the coastal China seas may be used as a potential indictor of these global-scale climate changes.