Barotropic seiches in a perennially ice‐covered lake, East Antarctica

Barotropic seiches in a perennially ice‐covered lake, East Antarctica
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东南极洲常年冰雪覆盖的湖泊中的正压水系

DOI:
10.1002/lol2.10226
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发表时间:
2021
影响因子:
7.8
通讯作者:
Lyons, W. Berry
Lyons, W. Berry
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Castendyk, Devin N.;Dugan, Hilary A.;Gallagher, Hugh A.;Pujara, Nimish;Doran, Peter T.;Priscu, John C.;Lyons, W. Berry

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在冰覆盖的湖泊中,水的运动是由风、沉积物热通量、太阳辐射、盐密度流和平流排放驱动的。在大型冰雪覆盖的湖泊中,风引起的振荡在水平流动中起着重要作用。在这里,我们报道了一个具有厚(~4米)永久冰盖的小湖泊中反复出现的风驱动的正压性融潮。在2010年至2016年期间,我们记录了东南极洲麦克默多干谷霍尔湖静水水位的10.5 - 13分钟振荡,使用的压力传感器系泊在湖底并悬挂在冰盖上。理论计算表明,正压性漩涡的周期应为12.6分钟。在冬季(2 - 11月)的大风(50 m s - 1)期间,正压沉降最为频繁。在夏季(12月至1月),当海岸线上的速冻冰变薄和融化时,这一时期增加了。
Water movement in ice‐covered lakes is known to be driven by wind, sediment heat flux, solar radiation, saline density flows, and advective stream discharge. In large ice‐covered lakes, wind‐induced oscillations have been found to play a major role in horizontal flows. Here, we report recurrent, wind‐driven, barotropic seiches in a small lake with a thick (~4 m) permanent ice‐cover. Between 2010 and 2016, we recorded 10.5‐ to 13‐min oscillations of the hydrostatic water level in Lake Hoare, McMurdo Dry Valleys, East Antarctica, using pressure transducers moored to the lake bottom and suspended from the ice cover. Theoretical calculations showed a barotropic seiche should have a period of 12.6 min. Barotropic seiches were most frequent during high wind events (> 5 m s−1) in winter months (February–November). The period increased during summer months (December–January) when fast ice thinned and melted along the shoreline.
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