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
复制标题
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
复制
发表时间:
2022
影响因子:
3.5
通讯作者:
Lukovich, Jennifer V.
中科院分区:
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.
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.
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DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
B. Newton;L. Tremblay;M. Cane;P. Schlosser
通讯作者:
P. Schlosser
影响因子:
3.2
作者:
Ilicak, Mehmet;Drange, Helge;Yeager, Steve G.
通讯作者:
Yeager, Steve G.
DOI:
--
发表时间:
2010-12
期刊:
--
影响因子:
--
作者:
S. Howell;A. Tivy;B. Alt;S. Mccourt;Rachel Chagnon;G. Crocker;T. Carrieres;J. Yackel
通讯作者:
S. Howell;A. Tivy;B. Alt;S. Mccourt;Rachel Chagnon;G. Crocker;T. Carrieres;J. Yackel
影响因子:
3.5
作者:
Petty A
通讯作者:
Petty A
影响因子:
--
作者:
P. Lemke;T. Manley
通讯作者:
T. Manley