Impact of sea ice transport on Beaufort Gyre liquid freshwater content.
Impact of sea ice transport on Beaufort Gyre liquid freshwater content.
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海冰运输对Beaufort Gyre液体淡水含量的影响。
DOI：
10.1007/s00382-022-06615-4
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发表时间：
2023
期刊：
影响因子：
4.6
通讯作者：
Marshall, John
中科院分区：
文献类型：
--
作者：
Cornish, Sam B.;Muilwijk, Morven;Scott, Jeffery R.;Marson, Juliana M.;Myers, Paul G.;Zhang, Wenhao;Wang, Qiang;Kostov, Yavor;Johnson, Helen L.;Marshall, John
北冰洋的波弗特环流（BG）是一个由风驱动的相对新鲜海水的水库，位于时间平均的反气旋大气环流之下，一年中的大部分时间都被流动的浮冰覆盖。液态淡水在该环流中的积累和排出具有重要意义，因为它有可能影响大西洋经向翻转环流，也因为淡水在调节海洋中热量、营养物质和碳的垂直通量以及与大气的热量和水分交换方面具有重要作用。在这里，我们研究了风驱动海冰进出BG区域影响环流淡水含量及其变率的假设。为了验证这一假设，我们使用了四种冰-海洋模式的协调气候响应函数实验结果，并结合了使用MITgcm区域设置的目标实验，其中我们旋转了地面风强迫向量（从而改变了这些风的地转成分）。我们的研究结果表明，通过对净热力学增长率的影响，海冰输送到BG的异常影响了液态淡水的调整。具体来说，增加的冰进口增加了环流中的淡水保留，而冰出口减少了环流中的淡水。我们的研究结果表明，地表风的地转成分的不确定性，以及海冰对这些风的动态响应，对冰的热力学和淡水有重要的影响。这种敏感性可以解释在波弗特环流淡水模拟中观测到的模式间传播及其对风强迫的调整。
The Arctic Ocean’s Beaufort Gyre (BG) is a wind-driven reservoir of relatively fresh seawater, situated beneath time-mean anticyclonic atmospheric circulation, and is covered by mobile pack ice for most of the year. Liquid freshwater accumulation in and expulsion from this gyre is of critical interest due to its potential to affect the Atlantic meridional overturning circulation and due to the importance of freshwater in modulating vertical fluxes of heat, nutrients and carbon in the ocean, and exchanges of heat and moisture with the atmosphere. Here, we investigate the hypothesis that wind-driven sea ice transport into/from the BG region influences the freshwater content of the gyre and its variability. To test this hypothesis, we use the results of a coordinated climate response function experiment with four ice-ocean models, in combination with targeted experiments using a regional setup of the MITgcm, in which we rotate the surface wind forcing vectors (thereby changing the ageostrophic component of these winds). Our results show that, via an effect on the net thermodynamic growth rate, anomalies in sea ice transport into the BG affect liquid freshwater adjustment. Specifically, increased ice import increases freshwater retention in the gyre, whereas ice export decreases freshwater in the gyre. Our results demonstrate that uncertainty in the ageostrophic component of surface winds, and in the dynamic sea ice response to these winds, has important implications for ice thermodynamics and freshwater. This sensitivity may explain some of the observed inter-model spread in simulations of Beaufort Gyre freshwater and its adjustment in response to wind forcing.
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影响因子：
5.2
作者：
Good, Peter;Gregory, Jonathan M.;Lowe, Jason A.
通讯作者：
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通讯作者：
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