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首页> 外文期刊>Climate dynamics >Enhancement of the southward return flow of the Atlantic Meridional Overturning Circulation by data assimilation and its influence in an assimilative ocean simulation forced by CORE-II atmospheric forcing
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Enhancement of the southward return flow of the Atlantic Meridional Overturning Circulation by data assimilation and its influence in an assimilative ocean simulation forced by CORE-II atmospheric forcing

机译：通过数据同化增强大西洋子午翻转环流的南向回流及其在CORE-II大气强迫强迫的同化海洋模拟中的影响

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摘要

This paper examines the difference in the Atlantic Meridional Overturning Circulation (AMOC) mean state between free and assimilative simulations of a common ocean model using a common interannual atmospheric forcing. In the assimilative simulation, the reproduction of cold cores in the Nordic Seas, which is absent in the free simulation, enhances the overflow to the North Atlantic and improves AMOC with enhanced transport of the deeper part of the southward return flow. This improvement also induces an enhanced supply of North Atlantic Deep Water (NADW) and causes better representation of the Atlantic deep layer despite the fact that correction by the data assimilation is applied only to temperature and salinity above a depth of 1750 m. It also affects Circumpolar Deep Water in the Southern Ocean. Although the earliest influence of the improvement propagated by coastal waves reaches the Southern Ocean in 10-15 years, substantial influence associated with the arrival of the renewed NADW propagates across the Atlantic Basin in several decades. Although the result demonstrates that data assimilation is able to improve the deep ocean state even if there is no data there, it also indicates that long-term integration is required to reproduce variability in the deep ocean originating from variations in the upper ocean. This study thus provides insights on the reliability of AMOC and the ocean state in the Atlantic deep layer reproduced by data assimilation systems.
机译：本文研究了使用常见的年际大气强迫对普通海洋模型进行的自由模拟和同化模拟之间的大西洋子午向翻转环流（AMOC）平均状态的差异。在同化模拟中，自由模拟中不存在的北欧海冷芯的繁殖增加了向北大西洋的溢流，并通过增强了南向回流的更深部分的运输而改善了AMOC。尽管通过数据同化进行的校正仅适用于1750 m深度以上的温度和盐度，但这种改进还导致北大西洋深水（NADW）的供应增加，并更好地表示了大西洋深层。它还会影响南大洋的极地深水。尽管沿海波浪传播的最早影响是在10至15年内到达南大洋，但与更新的NADW的到来相关的实质性影响却在数十年间遍及大西洋盆地。尽管结果表明即使没有数据，数据同化也能够改善深海状态，但它也表明需要长期整合以重现源自上层海洋变化的深海变化。因此，这项研究为数据同化系统再现的AMOC的可靠性和大西洋深层海洋状况提供了见识。

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