Episodic Southern Ocean Heat Loss and Its Mixed Layer Impacts Revealed by the Farthest South Multiyear Surface Flux Mooring
Episodic Southern Ocean Heat Loss and Its Mixed Layer Impacts Revealed by the Farthest South Multiyear Surface Flux Mooring
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DOI：
10.1029/2017gl076909
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发表时间：
2018-05-28
影响因子：
5.2
通讯作者：
Weller, R. A.
中科院分区：
文献类型：
--
作者：
Ogle, S. E.;Tamsitt, V.;Weller, R. A.
海洋天文台倡议在南大洋东南太平洋地区部署在54.08度的89.67华氏度的空气海量延伸系列是最远的南部长期开放海洋磁通式系泊台。系泊观测（2015年2月至2017年8月）提供了第一个原位量化，从一个主要的亚反二北极模式下水区之一对年度净空中热量交换进行了原位量化。当东北风将相对较冷的干燥空气带到系泊地点时，通常会发生发作性湍流损失事件（达到-294W/m（2）的每日平均净通量为-294W/m（2）），从而导致空气海温度和湿度差异很大。冬季热量损失事件促进了深层混合层的形成，从而导致下北极模式水的形成。但是，这些过程具有强烈的年际变化。 2015年冬季，2015年冬季的2个Sigma和3个Sigma湍流损失事件的频率更高，导致了深层混合层（> 300m），这在2016年冬季不存在。
The Ocean Observatories Initiative air-sea flux mooring deployed at 54.08 degrees S, 89.67 degrees W, in the southeast Pacific sector of the Southern Ocean, is the farthest south long-term open ocean flux mooring ever deployed. Mooring observations (February 2015 to August 2017) provide the first in situ quantification of annual net air-sea heat exchange from one of the prime Subantarctic Mode Water formation regions. Episodic turbulent heat loss events (reaching a daily mean net flux of -294W/m(2)) generally occur when northeastward winds bring relatively cold, dry air to the mooring location, leading to large air-sea temperature and humidity differences. Wintertime heat loss events promote deep mixed layer formation that lead to Subantarctic Mode Water formation. However, these processes have strong interannual variability; a higher frequency of 2 sigma and 3 sigma turbulent heat loss events in winter 2015 led to deep mixed layers (>300m), which were nonexistent in winter 2016.