Influence of the Advection of Labrador Sea Water on the Decadal Variability of the Eastern Subpolar North Atlantic

IF 3.3 2区 地球科学 Q1 OCEANOGRAPHY
C. Herbaut, M.-N. Houssais, A. C. Blaizot, S. Close
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Abstract

The upper ocean heat content of the eastern subpolar North Atlantic (ESPNA) displays large decadal variations, in particular, a warming starting in the mid-1990s followed by a cooling trend from the mid-2000s to the mid-2010s. Using an eddy permitting ice-ocean model, we find a relationship between the eastward propagation of dense water formed in the Labrador and Irminger Seas, the barotropic horizontal circulation and the advective heat convergence in the ESPNA. The time evolution of the 3-year average anomalies of the barotropic streamfunction (BSF) shows a strong resemblance to that of the depth of the deep isopycnals. In particular, the propagation of dense water drives a response of the BSF in the intergyre gyre region. During the warming period, the advection of dense water is associated with a southeastward expansion of the subpolar gyre and a reduction of the supply of cold water from the western subpolar North Atlantic to the upper layers of the ESPNA. Sensitivity experiments suggest that atmospheric forcing can also enhance the trends in the heat content, but the latter cannot be related to trends of the local wind curl. However, circulation changes induced by the wind curl on some specific years can amplify the heat content changes.

Abstract Image

拉布拉多海水平流对北大西洋亚极东部年代际变化的影响
北大西洋亚极地东部(ESPNA)上层海洋热含量表现出较大的年代际变化,特别是从20世纪90年代中期开始变暖,随后在2000年代中期至2010年代中期出现降温趋势。利用一个允许涡旋的冰-海模式,我们发现了拉布拉多海和伊尔明格海形成的稠密水的向东传播与ESPNA的正压水平环流和平流热辐合之间的关系。正压流函数(BSF) 3年平均距平的时间演化与深等距平深度的时间演化具有较强的相似性。特别地,稠密水的传播驱动了环流间区BSF的响应。在变暖期,密集水的平流与次极环流的东南扩张和北大西洋次极西部向ESPNA上层的冷水供应减少有关。敏感性试验表明,大气强迫也能增强热含量的变化趋势,但热含量与局地风旋度的变化趋势不相关。然而,在某些特定年份,由风旋度引起的环流变化可以放大热含量的变化。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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