Subglacial discharge plume behaviour revealed by CTD-instrumented ringed seals.
Subglacial discharge plume behaviour revealed by CTD-instrumented ringed seals.
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DOI：
10.1038/s41598-018-31875-8
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发表时间：
2018-09-07
影响因子：
4.6
通讯作者：
Lydersen C
中科院分区：
文献类型：
--
作者：
Everett A;Kohler J;Sundfjord A;Kovacs KM;Torsvik T;Pramanik A;Boehme L;Lydersen C
冰下排放的羽流大大增加了海洋冰川在海底的融化；然而，关于它们的性质和行为的现场数据有限。我们介绍了2012年在斯瓦尔巴群岛Kongsfjorden使用配备GPS的电导率-温度-深度卫星中继数据记录器(GPS-CTD-SRDLS)测量的环状海豹(Pusa Hispida)收集的海洋数据。海豹就在羽状物外面觅食，并在羽状物返回水面时从羽状物上升的核心内收集水文数据。在海面以下60 米处，海豹遇到的水中冰下排放的比例高达27%。环斑海豹对冰川末端冰下流量的时空变化反应迅速，这表明在羽流出现后，猎物很快就可以被捕食了。海豹的潜水位置被用来在四个月的时间里监测羽毛的存在。Kronebreen流域的高地表径流产生了强大的羽流，但即使在地表径流较低的时期也存在弱羽流。克朗布里恩冰川和其他潮水冰川的持续消退将导致这些海洋末端的消失，因为冰川退缩到陆地上。这里介绍的技术提高了我们对冰川退缩的驱动因素以及未来与冰川相关的鸟类和哺乳动物栖息地丧失的影响的理解。
Subglacial discharge plumes increase submarine melting of marine-terminating glaciers significantly; however, in-situ data on their properties and behaviour are limited. We present oceanographic data collected by ringed seals (Pusa hispida) instrumented with GPS-equipped conductivity-temperature-depth satellite relay data loggers (GPS-CTD-SRDLs) in Kongsfjorden, Svalbard, during 2012. The seals foraged just outside the plumes and collected hydrographic data from within the plumes’ upwelling cores as they returned to the surface. The seals encountered water with fractions of subglacial discharge as high as 27% at 60 m below the ocean surface. The ringed seals responded rapidly to spatial and temporal variations in subglacial discharge at the glacier terminus, suggesting that prey becomes available quickly following the appearance of plumes. The seals’ dive locations were used to monitor the presence of plumes over a four-month period. High surface runoff from Kronebreen catchment created strong plumes, but weak plumes were present even during periods of low surface runoff. The continued retreat of Kronebreen, and other tidewater glaciers, will lead to the loss of these marine-termini as the glaciers retreat onto land. The techniques presented here improve our understanding of the drivers of glacial retreat and the implications of future habitat loss for glacier-associated birds and mammals.
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影响因子：
2.3
作者：
Lowther, Andrew D.;Kovacs, Kit M.;Lydersen, Christian
通讯作者：
Lydersen, Christian
影响因子：
3.6
作者：
Cowton, Tom;Slater, Donald;Nienow, Peter
通讯作者：
Nienow, Peter
影响因子：
6.6
作者：
Dujon, Antoine M.;Lindstrom, R. Todd;Hays, Graeme C.
通讯作者：
Hays, Graeme C.
影响因子：
5.2
作者：
Jackson, R. H.;Shroyer, E. L.;Stearns, L. A.
通讯作者：
Stearns, L. A.
影响因子：
2.8
作者：
Lydersen, Christian;Assmy, Philipp;Zajaczkowski, Marek
通讯作者：
Zajaczkowski, Marek