Warming of the interior Arctic Ocean linked to sea ice losses at the basin margins.

Warming of the interior Arctic Ocean linked to sea ice losses at the basin margins.
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DOI:
10.1126/sciadv.aat6773
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发表时间:
2018-08
期刊:
影响因子:
13.6
通讯作者:
Krishfield R
Krishfield R
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Timmermans ML;Toole J;Krishfield R

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减少的海冰覆盖打开了一条管道,让太阳能加热的水到达北极盆地内部的盐跃层。北冰洋的测量显示,在过去30年(1987-2017),相对于Beaufort Gyre盐跃层的冰点温度,海洋热含量几乎翻了一番。这种变暖与楚科奇海北部表层水域的异常太阳加热有关,楚科奇海北部是盐跃层海水进入波弗特环流内部的主要入口。在同一时期,表层水域对夏季太阳热量的吸收增加了五倍,这主要是因为海冰覆盖率降低。结果表明,太阳加热与该地区地表水的俯冲速率相结合,足以解释观测到的盐跃层变暖。因此,盆地边缘的热吸收及其随后在海洋内部的积累,对夏季以后的波弗特盖尔海冰产生了影响。
Reduced sea ice cover opens a conduit for solar-heated water to reach the interior Arctic Basin halocline. Arctic Ocean measurements reveal a near doubling of ocean heat content relative to the freezing temperature in the Beaufort Gyre halocline over the past three decades (1987–2017). This warming is linked to anomalous solar heating of surface waters in the northern Chukchi Sea, a main entryway for halocline waters to join the interior Beaufort Gyre. Summer solar heat absorption by the surface waters has increased fivefold over the same time period, chiefly because of reduced sea ice coverage. It is shown that the solar heating, considered together with subduction rates of surface water in this region, is sufficient to account for the observed halocline warming. Heat absorption at the basin margins and its subsequent accumulation in the ocean interior, therefore, have consequences for Beaufort Gyre sea ice beyond the summer season.
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