A See‐Saw in Pacific Subantarctic Mode Water Formation Driven by Atmospheric Modes
A See‐Saw in Pacific Subantarctic Mode Water Formation Driven by Atmospheric Modes
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DOI：
10.1029/2019gl085280
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发表时间：
2019-11
影响因子：
5.2
通讯作者：
A. Meijers;I. Cerovečki;B. King;V. Tamsitt
中科院分区：
文献类型：
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作者：
A. Meijers;I. Cerovečki;B. King;V. Tamsitt
太平洋的亚季风模式水（SAMW）在太平洋中南部和东南部形成两个不同的水池，它们潜入海洋内部并影响全球热量和碳的储存。中部和东部SAMW池的冬季厚度主要彼此异相变化，每年之间高达±150 m，导致年际厚度见板。东（中）池的厚度被发现与南方环形模态（SAM）和厄尔尼诺-南方涛动（ENSO）有很强的正（负）相关。SAM和ENSO的相对相位决定了SAMW的厚度，2005-2008年和2012-2017年的相位增强模式驱动了池之间的强烈差异。在2008年和2012年之间，异相大气模式导致不太相干的SAMW模式。SAM和ENSO调制的风应力和湍流热通量驱动的本地形成的SAMW厚度占主导地位。
Subantarctic Mode Water (SAMW) in the Pacific forms in two distinct pools in the south central and southeast Pacific, which subduct into the ocean interior and impact global storage of heat and carbon. Wintertime thickness of the central and eastern SAMW pools vary predominantly out of phase with each other, by up to ±150 m between years, resulting in an interannual thickness see‐saw. The thickness in the eastern (central) pool is found to be strongly positively (negatively) correlated with both the Southern Annular Mode (SAM) and El Niño–Southern Oscillation (ENSO). The relative phases of the SAM and ENSO set the SAMW thickness, with in phase reinforcing modes in 2005–2008 and 2012–2017 driving strong differences between the pools. Between 2008 and 2012 out of phase atmospheric modes result in less coherent SAMW patterns. SAMW thickness is dominated by local formation driven by SAM and ENSO modulated wind stress and turbulent heat fluxes.