气候变化领域集成服务门户(CCPortal): Ocean mixing and heat transport processes observed under the Ross Ice Shelf control its basal melting

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DOI	10.1073/pnas.1910760117
	Ocean mixing and heat transport processes observed under the Ross Ice Shelf control its basal melting
	Stevens C.; Hulbe C.; Brewer M.; Stewart C.; Robinson N.; Ohneiser C.; Jendersie S.
发表日期	2020
ISSN	0027-8424
起始页码	16799
结束页码	16804
卷号	117 期号:29
英文摘要	The stability of large Antarctic ice shelves has important implications for global sea level, sea ice area, and ocean circulation. A significant proportion of ice mass loss from these ice shelves is through ocean-driven melting which is controlled by largely unobserved oceanic thermodynamic and circulatory processes in the cavity beneath the ice shelf. Here we use direct measurements to provide evidence of the changing water column structure in the cavity beneath the Ross Ice Shelf, the planet's largest ice shelf by area. The cavity water column data exhibit both basal and benthic boundary layers, along with evidence of tidally modulated and diffusively convecting internal mixing processes. A region of thermohaline interleaving in the upper-middle water column indicates elevated diffusion and the potential to modify the cavity circulation. The measurements were recorded using the Aotearoa New Zealand Ross Ice Shelf Program hot water drill borehole melted in the central region of the shelf in December 2017 (HWD2), only the second borehole through the central region of the ice shelf, following J9 in 1977. These data, and comparison with the 1977 data, provide valuable insight into ice shelf cavity circulation and aid understanding of the evolution of the presently stable Ross Ice Shelf. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Antarctic oceanography; Basal melting; Ice shelf cavity; Interleaving; Ocean mixing
语种	英语
scopus关键词	Antarctica; Article; benthos; evolution; freezing; heat transfer; ice shelf; melting point; ocean mixing; oceanography; priority journal; salinity; sea; temperature; thermodynamics; water and water related phenomena
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158847
作者单位	Stevens, C., Ocean Dynamics Group, New Zealand National Institute of Water and Atmospheric Research, Wellington, 6241, New Zealand, Department of Physics, University of Auckland, Auckland, 1010, New Zealand; Hulbe, C., Department of Surveying, University of Otago, Dunedin, 9016, New Zealand; Brewer, M., Ocean Dynamics Group, New Zealand National Institute of Water and Atmospheric Research, Wellington, 6241, New Zealand; Stewart, C., Ocean Dynamics Group, New Zealand National Institute of Water and Atmospheric Research, Wellington, 6241, New Zealand; Robinson, N., Ocean Dynamics Group, New Zealand National Institute of Water and Atmospheric Research, Wellington, 6241, New Zealand; Ohneiser, C., Department of Geology, University of Otago, Dunedin, 9054, New Zealand; Jendersie, S., Antarctic Research Centre, Victoria University of Wellington, Wellington, 6140, New Zealand
推荐引用方式 GB/T 7714	Stevens C.,Hulbe C.,Brewer M.,et al. Ocean mixing and heat transport processes observed under the Ross Ice Shelf control its basal melting[J],2020,117(29).
APA	Stevens C..,Hulbe C..,Brewer M..,Stewart C..,Robinson N..,...&Jendersie S..(2020).Ocean mixing and heat transport processes observed under the Ross Ice Shelf control its basal melting.Proceedings of the National Academy of Sciences of the United States of America,117(29).
MLA	Stevens C.,et al."Ocean mixing and heat transport processes observed under the Ross Ice Shelf control its basal melting".Proceedings of the National Academy of Sciences of the United States of America 117.29(2020).