Arrival of New Great Salinity Anomaly Weakens Convection in the Irminger Sea
Arrival of New Great Salinity Anomaly Weakens Convection in the Irminger Sea
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DOI：
10.1029/2022gl098857
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发表时间：
2022-06-16
影响因子：
5.2
通讯作者：
Le Bras, I. A-A
中科院分区：
文献类型：
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作者：
Bilo, T. C.;Straneo, F.;Le Bras, I. A-A
副极地北大西洋容易发生周期性的极端淡化事件，称为大盐度异常（GSA）。在这里，我们结合联合收割机水文海洋分析和停泊的观测记录的到达，传播和最近的GSA在Irminger海的影响。这一GSA与2015年至2020年期间上部Irminger海的快速淡化有关，最终达到20世纪90年代和可能自1960年以来最新鲜年份的年平均盐度。当GSA传播到Reykjanes海岭的Irminger海时，边界流在几个月内迅速将其信号平流到盆地周围，而较新鲜的沃茨则慢慢扩散并积累到内部。2017-2018年冬季深对流产生的内部清新沃茨异常，在随后的两个冬季对深对流的抑制做出了积极贡献。
The Subpolar North Atlantic is prone to recurrent extreme freshening events called Great Salinity Anomalies (GSAs). Here, we combine hydrographic ocean analyses and moored observations to document the arrival, spreading, and impacts of the most recent GSA in the Irminger Sea. This GSA is associated with a rapid freshening of the upper Irminger Sea between 2015 and 2020, culminating in annually averaged salinities as low as the freshest years of the 1990s and possibly since 1960. Upon the GSA propagation into the Irminger Sea over the Reykjanes Ridge, the boundary currents rapidly advected its signal around the basin within months while fresher waters slowly spread and accumulated into the interior. The anomalies in the interior freshened waters produced by deep convection during the 2017-2018 winter and actively contributed to the suppression of deep convection in the following two winters.