Freshwater Input and Vertical Mixing in the Canada Basin’s Seasonal Halocline: 1975 versus 2006–12

Freshwater Input and Vertical Mixing in the Canada Basin’s Seasonal Halocline: 1975 versus 2006–12
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加拿大盆地季节性盐跃层的淡水输入和垂直混合:1975 年与 2006 年对比 - 12

DOI:
10.1175/jpo-d-21-0116.1
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发表时间:
2022
影响因子:
3.5
通讯作者:
Lukovich, Jennifer V.
Lukovich, Jennifer V.
中科院分区:
地球科学2区
文献类型:
--
作者:
Rosenblum, Erica;Stroeve, Julienne;Gille, Sarah T.;Lique, Camille;Fajber, Robert;Tremblay, L. Bruno;Galley, Ryan;Loureiro, Thiago;Barber, David G.;Lukovich, Jennifer V.

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北极季节性盐跃层影响着表层和深层海洋之间的热量、能量和营养物质的交换,在过去几十年里,随着北极海冰的融化,盐跃层正在发生变化。在这里,我们评估季节性盐跃层的形成,在1975年和2006-12年通过比较每日,5月至9月,在加拿大盆地海冰下收集的盐度剖面。我们评估两个时间段之间的差异,使用一个一维(1D)散装模型,以量化淡水输入和垂直混合的差异。一维度量表明,两个独立的因素有助于类似的更强的分层在2006-12年相对于1975年:1)更大的地表淡水输入和2)更少的垂直混合的淡水。较大的淡水输入主要在8月至9月很重要,这与近年来较长的融化季节一致。减少垂直混合主要是重要的,从6月到8月中旬,当类似的淡水输入水平在1975年和2006-12年混合在不同的深度范围内,导致不同的分层。这些结果意味着,十年的变化,冰海洋动力学,除了淡水输入,显着有助于更强的季节分层在2006-12年相对于1975年。这些研究结果突出了近地表过程研究的必要性,以阐明横向过程和冰-海洋动量交换对垂直混合的影响。此外,这些结果可能为改善气候模式中北极上层海洋分层的年代际变化代表性提供见解,这些气候模式没有捕获垂直混合的年代际变化。
The Arctic seasonal halocline impacts the exchange of heat, energy, and nutrients between the surface and the deeper ocean, and it is changing in response to Arctic sea ice melt over the past several decades. Here, we assess seasonal halocline formation in 1975 and 2006–12 by comparing daily, May–September, salinity profiles collected in the Canada Basin under sea ice. We evaluate differences between the two time periods using a one-dimensional (1D) bulk model to quantify differences in freshwater input and vertical mixing. The 1D metrics indicate that two separate factors contribute similarly to stronger stratification in 2006–12 relative to 1975: 1) larger surface freshwater input and 2) less vertical mixing of that freshwater. The larger freshwater input is mainly important in August–September, consistent with a longer melt season in recent years. The reduced vertical mixing is mainly important from June until mid-August, when similar levels of freshwater input in 1975 and 2006–12 are mixed over a different depth range, resulting in different stratification. These results imply that decadal changes to ice–ocean dynamics, in addition to freshwater input, significantly contribute to the stronger seasonal stratification in 2006–12 relative to 1975. These findings highlight the need for near-surface process studies to elucidate the impact of lateral processes and ice–ocean momentum exchange on vertical mixing. Moreover, the results may provide insight for improving the representation of decadal changes to Arctic upper-ocean stratification in climate models that do not capture decadal changes to vertical mixing.
北冰洋对环形大气模式响应的简单模型
DOI: --
发表时间: 2006
期刊:
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发表时间: 2016-04-01
期刊: OCEAN MODELLING
影响因子: 3.2
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影响因子: 3.5
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DOI: 10.1029/jc089ic04p06494
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