The Beaufort Gyre variation and its impacts on the Canada Basin in 2003-2012

ZHONG Wenli; ZHAO Jinping; SHI Jiuxin; CAO Yong

doi:10.1007/s13131-015-0657-0

2003-2012年波弗特流涡多年变化及其在加拿大海盆的影响

doi: 10.1007/s13131-015-0657-0

中国海洋大学, 物理海洋重点实验室, 青岛

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- 收稿日期: 2014-06-20
- 修回日期: 2015-02-03

The Beaufort Gyre variation and its impacts on the Canada Basin in 2003-2012

Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China

摘要

摘要: 波弗特流涡是调控北冰洋上层海洋的重要因素, 其在过去十多年里自旋加速。加拿大海盆上层海洋不仅热含量和淡水含量显著增加, 还有更多的动能输入其中。地转风涡度和淡水含量的增加都贡献于波弗特流涡的自旋加速。即使风场没有变化, 单独由淡水含量的增加也能造就波弗特流涡的自旋加速。本研究显示在波弗特流涡自旋加速时太平洋水不易直接流入海盆中部, 在2005年和2009年波弗特流涡中心处的夏季太平洋水(PSW)温度极大值呈现出显著的降低, 这与夏季太平洋水流动路径发生的转向有关。艾克曼泵压的增强会辐聚更多的淡水进而使得太平洋冬季水(PWW)加深。水柱动力学性质的转变也贡献于2007年之后北极中层水的加深。在2012年艾克曼泵压显著减小(意味着波弗特流涡的自旋减速), 艾克曼输运方向转向北方也有利于在加拿大海盆多年积聚的淡水的释放。
- 波弗特流涡 /
- 艾克曼泵压 /
- 淡水含量 /
- 地转流 /
- 加拿大海盆
Abstract: The Beaufort Gyre (BG) was spun up in the last decade which is an important factor in regulating the variation of the upper ocean. The heat content and freshwater content of the upper ocean increased gradually in the Canada Basin, as did momentum input. Both the geostrophic wind curl and freshwater content could contribute to the spin-up of BG. However, even though there is no change of the wind field the increasing freshwater alone could result in the spin-up of BG. In this study we show that the Pacific Water is difficult to flow into the central basin as the BG spins up and the maximum temperature of the Pacific Summer Water (PSW) experienced a dramatic decrease inside the BG in 2005 and 2009 due to a change of flow pathway of PSW. The enhancement of Ekman Pumping (EP) contributed to the deepening of the Pacific Winter Water by piling up more freshwater. This change of water column dynamics has also contributed to the deepening ofthe Atlantic Water core after 2007. The EP decreased significantly in 2012 (indicating a spin down of BG) and the direction of Ekman transport turned to the north, which favoured the release of freshwater that had resided in the basin for years.
- Beaufort Gyre /
- Ekman pumping /
- freshwater content /
- geostrophic current /
- Canada Basin

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参考文献(54)

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2003-2012年波弗特流涡多年变化及其在加拿大海盆的影响

doi: 10.1007/s13131-015-0657-0

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The Beaufort Gyre variation and its impacts on the Canada Basin in 2003-2012

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