气候变化领域集成服务门户(CCPortal): Ocean Variability at Greenland's Largest Glacier Tongue Linked to Continental Shelf Circulation

CCPortal

DOI	10.1029/2020JC017080
	Ocean Variability at Greenland's Largest Glacier Tongue Linked to Continental Shelf Circulation
	von Albedyll L.; Schaffer J.; Kanzow T.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	Increased ocean-to-ice heat fluxes play a key role in the accelerated mass loss of Greenland’s marine-terminating glaciers. Ocean current variability leads to variations in this heat flux. A year-long time series of ocean currents at all gateways to the ocean cavity under Greenland’s largest remaining floating ice tongue at the Nioghalvfjerdsfjorden Glacier (79NG) was analyzed. The variability of the exchange flow at intra-annual to near-daily timescales was characterized. The currents exhibit considerable variability with standard deviations exceeding the time mean flow strength by a factor of 2. The inflow of warm Atlantic Intermediate Water into the cavity and the outflow via the northernmost calving front were directly coupled on intra-annual timescales (periods, T > 30 days) with enhanced fluctuations in the winter months. A strong correlation between the variability of the deep inflow and currents in the subsurface boundary current on the continental shelf suggests a link between cavity and continental shelf circulation. Variability on higher frequencies (T < 30 days) in the outflow was only partly induced by the inflow variability. Two export branches of the cavity circulation were identified, which were potentially constrained by subglacial meltwater channels. The relative importance of the two export branches varies on monthly time scales. This research has provided evidence that the large intra-annual ocean current variability at the 79NG is strongly influenced by the continental shelf circulation. Temporally varying preferred export routes increase the complexity of the cavity circulation. © 2021. The Authors.
英文关键词	basal melt; Greenland; ice ocean interaction; ice shelves; ocean variability
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186306
作者单位	Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, Germany; University of Bremen, Bremen, Germany
推荐引用方式 GB/T 7714	von Albedyll L.,Schaffer J.,Kanzow T.. Ocean Variability at Greenland's Largest Glacier Tongue Linked to Continental Shelf Circulation[J],2021,126(5).
APA	von Albedyll L.,Schaffer J.,&Kanzow T..(2021).Ocean Variability at Greenland's Largest Glacier Tongue Linked to Continental Shelf Circulation.Journal of Geophysical Research: Oceans,126(5).
MLA	von Albedyll L.,et al."Ocean Variability at Greenland's Largest Glacier Tongue Linked to Continental Shelf Circulation".Journal of Geophysical Research: Oceans 126.5(2021).