Seasonal modification of the Arctic Ocean intermediate water layer off the eastern Laptev Sea continental shelf break
Seasonal modification of the Arctic Ocean intermediate water layer off the eastern Laptev Sea continental shelf break
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DOI：
10.1029/2008jc005229
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发表时间：
2009-06
影响因子：
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通讯作者：
I. Dmitrenko;S. Kirillov;V. Ivanov;R. Woodgate;I. Polyakov;Nikolay Koldunov;L. Fortier;C. Lalande-C.-Lalan
中科院分区：
文献类型：
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作者：
I. Dmitrenko;S. Kirillov;V. Ivanov;R. Woodgate;I. Polyakov;Nikolay Koldunov;L. Fortier;C. Lalande-C.-Lalan
高达总方差的 75%。我们的数据表明，整个 AW 层至少 840 m 受到季节性循环的影响，尽管温度和盐度的季节性信号强度从 260 m（±0.25C 和 ±0.025 psu）降低到 840 m（±0.05C 和 ±0.005 psu）。季节性速度信号明显较弱，被高频变化强烈掩盖，并且滞后温盐周期 45-75 天。我们假设我们的系泊记录显示了由 AW 边界流向下游携带的 AW 季节性信号沿边缘传播的时间历史。我们的分析表明，AW 弗拉姆海峡分支 (FSBW) 260 m 处的季节性信号主要来自弗拉姆海峡，而 AW 巴伦支海分支 (BSBW) 域（840 m 处）的季节性则归因于巴伦支海输入的季节性信号。然而，通过整个 AW 层观察到的 BSBW 季节性动态特征使我们推测 BSBW 也在季节性改变 FSBW 属性方面发挥着作用。
up to 75% of the total variance. Our data suggest that the entire AW layer down to at least 840 m is affected by seasonal cycling, although the strength of the seasonal signal in temperature and salinity reduces from 260 m (±0.25C and ±0.025 psu) to 840 m (±0.05C and ±0.005 psu). The seasonal velocity signal is substantially weaker, strongly masked by high-frequency variability, and lags the thermohaline cycle by 45–75 days. We hypothesize that our mooring record shows a time history of the along-margin propagation of the AW seasonal signal carried downstream by the AW boundary current. Our analysis suggests that the seasonal signal in the Fram Strait Branch of AW (FSBW) at 260 m is predominantly translated from Fram Strait, while the seasonality in the Barents Sea branch of AW (BSBW) domain (at 840 m) is attributed instead to the seasonal signal input from the Barents Sea. However, the characteristic signature of the BSBW seasonal dynamics observed through the entire AW layer leads us to speculate that BSBW also plays a role in seasonally modifying the properties of the FSBW.