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On freshwater fluxes and the Atlantic meridional overturning circulation
Limnology and Oceanography Letters ( IF 7.8 ) Pub Date : 2020-01-16 , DOI: 10.1002/lol2.10125 B. B. Cael 1 , Malte F. Jansen 2
Limnology and Oceanography Letters ( IF 7.8 ) Pub Date : 2020-01-16 , DOI: 10.1002/lol2.10125 B. B. Cael 1 , Malte F. Jansen 2
Affiliation
We address the role of freshwater forcing in the modern day ocean. Specifically, we ask the question of whether an amplification of the global freshwater forcing pattern leads to a strengthening or weakening of the steady‐state Atlantic Meridional Overturning Circulation (AMOC). While the role of freshwater forcing in the AMOC has received much attention, this question remains unresolved, in part because past studies have primarily investigated idealized models, large regime shifts away from the modern ocean state, or coupled atmosphere–ocean simulations on shorter timescales than required for the deep ocean to equilibrate. Here we study the AMOC's sensitivity at equilibrium to small perturbations in the magnitude of the global freshwater fluxes in simulations performed with a realistically configured ocean circulation model. Our results robustly suggest that for the equilibrium state of the modern ocean, freshwater fluxes strengthen the AMOC, in the sense that an amplification of the existing freshwater flux‐forcing pattern leads to a strengthening of the AMOC and vice versa. A simple physical argument explains these results: the North Atlantic is anomalously salty at depth and increased freshwater fluxes act to amplify that salinity pattern, resulting in enhanced AMOC transport.
中文翻译:
关于淡水通量和大西洋经向翻转环流
我们探讨了现代海洋中强迫淡水的作用。具体来说,我们提出一个问题,即全球淡水强迫模式的扩大会导致稳态的大西洋子午颠覆环流(AMOC)的增强还是减弱。尽管淡水强迫在AMOC中的作用受到了广泛关注,但这个问题仍未得到解决,部分原因是过去的研究主要研究了理想化模型,大范围的政权转移远离现代海洋状态,或者在短时间尺度上耦合了大气-海洋模拟深海平衡所必需的。在这里,我们通过现实配置的海洋环流模型进行的模拟研究了AMOC在平衡时对全球淡水通量大小的小扰动的敏感性。我们的结果有力地表明,就现代海洋的平衡状态而言,淡水通量会增强AMOC,从某种意义上说,现有淡水通量强迫模式的放大会导致AMOC的增强,反之亦然。一个简单的物理论据解释了这些结果:北大西洋在深度上异常咸,并且增加的淡水通量起到放大该盐度模式的作用,从而导致AMOC运移增加。
更新日期:2020-01-16
中文翻译:
关于淡水通量和大西洋经向翻转环流
我们探讨了现代海洋中强迫淡水的作用。具体来说,我们提出一个问题,即全球淡水强迫模式的扩大会导致稳态的大西洋子午颠覆环流(AMOC)的增强还是减弱。尽管淡水强迫在AMOC中的作用受到了广泛关注,但这个问题仍未得到解决,部分原因是过去的研究主要研究了理想化模型,大范围的政权转移远离现代海洋状态,或者在短时间尺度上耦合了大气-海洋模拟深海平衡所必需的。在这里,我们通过现实配置的海洋环流模型进行的模拟研究了AMOC在平衡时对全球淡水通量大小的小扰动的敏感性。我们的结果有力地表明,就现代海洋的平衡状态而言,淡水通量会增强AMOC,从某种意义上说,现有淡水通量强迫模式的放大会导致AMOC的增强,反之亦然。一个简单的物理论据解释了这些结果:北大西洋在深度上异常咸,并且增加的淡水通量起到放大该盐度模式的作用,从而导致AMOC运移增加。