Biophysical Consequences of a Relaxing Beaufort Gyre
Biophysical Consequences of a Relaxing Beaufort Gyre
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DOI：
10.1029/2019gl085990
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发表时间：
2020-01
影响因子：
5.2
通讯作者：
Jinlun Zhang;Y. Spitz;M. Steele;C. Ashjian;R. Campbell;A. Schweiger
中科院分区：
文献类型：
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作者：
Jinlun Zhang;Y. Spitz;M. Steele;C. Ashjian;R. Campbell;A. Schweiger
一个生物物理模型显示，博福特环流（BG）在2004-2016年加强，随后在2017-2018年放松，基于BG变异指数。BG加强导致加拿大盆地中部（CCB）的下降流增强，沿海岸沿着上升流增强。在CCB中，增强的下降流减少了营养物质，从而降低了初级生产力（PP）和浮游生物生物量。增强上升流沿着海岸和楚科奇陆架/斜坡的部分地区增加营养物质，导致升高PP/生物量在太平洋北冰洋（PAO）以外的CCB。总体PAO PP/生物量主要是由货架/斜坡响应，从而增加BG强化。随着BG在2017-2018年的放松，这些过程在很大程度上发生了逆转，CCB的PP/生物量增加，而大多数大陆架/斜坡区域的PP/生物量减少。由于陆棚/斜坡区域比CCB多产，BG松弛有降低PAO总产量的趋势。
A biophysical model shows that Beaufort Gyre (BG) intensification in 2004–2016 is followed by relaxation in 2017–2018, based on a BG variability index. BG intensification leads to enhanced downwelling in the central Canada Basin (CCB) and upwelling along the coast. In the CCB, enhanced downwelling reduces nutrients, thus lowering primary productivity (PP) and plankton biomass. Enhanced upwelling along the coast and in parts of the Chukchi shelf/slope increases nutrients, leading to elevated PP/biomass in the Pacific Arctic Ocean (PAO) outside of the CCB. The overall PAO PP/biomass is dominated by the shelf/slope response and thus increases during BG intensification. As the BG relaxes in 2017–2018, these processes largely reverse, with increasing PP/biomass in the CCB and decreasing PP/biomass in most of the shelf/slope regions. Because the shelf/slope regions are much more productive than the CCB, BG relaxation has the tendency to reduce the overall production in the PAO.