Tropical Meridional Overturning Circulation Observed by Subsurface Moorings in the Western Pacific.

Tropical Meridional Overturning Circulation Observed by Subsurface Moorings in the Western Pacific.
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西太平洋地下系泊装置观测到的热带经向翻转环流

DOI:
10.1038/s41598-018-26047-7
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发表时间:
2018-05-16
期刊:
影响因子:
4.6
通讯作者:
Guan C
Guan C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Song L;Li Y;Wang J;Wang F;Hu S;Liu C;Diao X;Guan C

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2014年8月至2015年10月期间,在142°E部署的7个地下系泊装置记录了西北太平洋的经向洋流。在0-6°N之间,热带纬向翻转环流(TMOC)呈现三明治结构,由地面向北气流(0-80 m)、温跃层向南气流(80-260 m; 22.6-26.5 σθ)和次温跃层向北气流(260-500 m; 26.5-26.9 σθ)组成。根据系泊资料,沿着卫星资料和再分析资料,在所有三个层中观察到显著的季节到年际变化,赤道纬向风被认为是变化的主要原因。TMOC一般在北方冬季较强,夏季较弱。在2014-2015年期间,TMOC因与厄尔尼诺现象相关的西风异常而大大减弱。进一步的分析表明,TMOC可以通过异常上升流/下降流影响西太平洋赤道表面温度,并可能在厄尔尼诺-南方涛动(ENSO)中发挥重要作用。
Meridional ocean current in the northwestern Pacific was documented by seven subsurface moorings deployed at 142°E during August 2014-October 2015. A sandwich structure of the tropical meridional overturning circulation (TMOC) was revealed between 0–6°N that consists of a surface northward flow (0–80 m), a thermocline southward flow (80–260 m; 22.6–26.5 σθ), and a subthermocline northward flow (260–500 m; 26.5–26.9 σθ). Based on mooring data, along with satellite and reanalysis data, prominent seasonal-to-interannual variations were observed in all three layers, and the equatorial zonal winds were found to be a dominant cause of the variations. The TMOC is generally stronger in boreal winter and weaker in summer. During 2014–2015, the TMOC was greatly weakened by westerly wind anomalies associated with the El Niño condition. Further analysis suggests that the TMOC can affect equatorial surface temperature in the western Pacific through anomalous upwelling/downwelling and likely plays a vital role in the El Niño-Southern Oscillation (ENSO).
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