globalchange  > 气候减缓与适应
DOI: 10.1002/2017JC013069
Scopus记录号: 2-s2.0-85051237606
论文题名:
Seasonal Evolution of Ocean Heat Supply and Freshwater Discharge From a Rapidly Retreating Tidewater Glacier: Jorge Montt, Patagonia
作者: Moffat C.; Tapia F.J.; Nittrouer C.A.; Hallet B.; Bown F.; Boldt Love K.; Iturra C.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:6
起始页码: 4200
结束页码: 4223
语种: 英语
英文关键词: fjords ; glaciers ; Patagonia ; retreat
英文摘要: Proglacial fjords are critical conduits for the exchange of heat and freshwater between the ocean and land ice, and their dynamics heavily modulate the rate of retreat of tidewater glaciers. Here the magnitude, spatial structure, and seasonal evolution of the ocean forcing on the proglacial fjord off a rapidly retreating glacier (Jorge Montt, Patagonia) are characterized using data from multiple shipboard surveys from 2010 to 2016, a multiyear mooring array, and a weather station. The melting of the glacier is forced by relatively warm (8–11°C) waters entering the fjord over a shallow (45 m deep) sill ≈20 km from the terminus. This warm subsurface water is renewed every summer from the surface layer of Gulf of Penas., is transported along the 100-km long Baker Channel, and reaches the proglacial fjord in the late austral summer to early fall, where it remains relatively warm until late austral spring. Analysis of the freshwater fractions in the fjord reveals that the total freshwater content has a strong seasonal signal with maximum fractional values in the summer, mostly explained by the seasonality of subglacial discharge from the glacier. The submarine melting fraction has no strong seasonal signal, but is a first-order contributor to the freshwater content of the fjord in winter. This seasonal evolution is consistent with idealized theories of meltwater production, and suggests that the seasonal supply of heat is critical to sustain a high mean temperature for melting, but does not directly control the melting rate variability. © 2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113799
Appears in Collections:气候减缓与适应

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作者单位: School of Marine Science and Policy, University of Delaware, Newark, DE, United States; COPAS-Sur Austral, University of Concepcion, Concepcion, Chile; Department of Oceanography, University of Concepcion, Concepcion, Chile; School of Oceanography, University of Washington, Seattle, WA, United States; Department of Earth and Space Sciences and Quaternary Research Center, University of Washington, Seattle, WA, United States; Centro de Estudios Científicos, Valdivia, Chile

Recommended Citation:
Moffat C.,Tapia F.J.,Nittrouer C.A.,et al. Seasonal Evolution of Ocean Heat Supply and Freshwater Discharge From a Rapidly Retreating Tidewater Glacier: Jorge Montt, Patagonia[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(6)
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