气候变化领域集成服务门户(CCPortal): Brief communication: PICOP, a new ocean melt parameterization under ice shelves combining PICO and a plume model

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DOI	10.5194/tc-13-1043-2019
	Brief communication: PICOP, a new ocean melt parameterization under ice shelves combining PICO and a plume model
	Pelle T.; Morlighem M.; Bondzio J.H.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	1043
结束页码	1049
卷号	13 期号:3
英文摘要	Basal melting at the bottom of Antarctic ice shelves is a major control on glacier dynamics, as it modulates the amount of buttressing that floating ice shelves exert onto the ice streams feeding them. Three-dimensional ocean circulation numerical models provide reliable estimates of basal melt rates but remain too computationally expensive for century-scale projections. Ice sheet modelers therefore routinely rely on simplified parameterizations based on either ice shelf depth or more sophisticated box models. However, existing parameterizations do not accurately resolve the complex spatial patterns of sub-shelf melt rates that have been observed over Antarctica's ice shelves, especially in the vicinity of the grounding line, where basal melting is one of the primary drivers of grounding line migration. In this study, we couple the Potsdam Ice-shelf Cavity mOdel (PICO, Reese et al., 2018) to a buoyant plume melt rate parameterization (Lazeroms et al., 2018) to create PICOP, a novel basal melt rate parameterization that is easy to implement in transient ice sheet numerical models and produces a melt rate field that is in excellent agreement with the spatial distribution and magnitude of observations for several ocean basins. We test PICOP on the Amundsen Sea sector ofWest Antarctica, Totten, and Moscow University ice shelves in East Antarctica and the Filchner-Ronne Ice Shelf and compare the results to PICO. We find that PICOP is able to reproduce inferred high melt rates beneath Pine Island, Thwaites, and Totten glaciers (on the order of 100myr-1) and removes the "banding" pattern observed in melt rates produced by PICO over the Filchner-Ronne Ice Shelf. PICOP resolves many of the issues contemporary basal melt rate parameterizations face and is therefore a valuable tool for those looking to make future projections of Antarctic glaciers. © Author(s) 2019.
学科领域	atmospheric plume; basal melting; floating ice; grounding line; ice shelf; numerical model; ocean basin; parameterization; snowmelt; spatial distribution; Amundsen Sea; Antarctica; Brandenburg [Germany]; East Antarctica; Filchner-Ronne Ice Shelf; Germany; Pine Island Glacier; Potsdam; Southern Ocean; West Antarctica
语种	英语
scopus关键词	atmospheric plume; basal melting; floating ice; grounding line; ice shelf; numerical model; ocean basin; parameterization; snowmelt; spatial distribution; Amundsen Sea; Antarctica; Brandenburg [Germany]; East Antarctica; Filchner-Ronne Ice Shelf; Germany; Pine Island Glacier; Potsdam; Southern Ocean; West Antarctica
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118901
作者单位	Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States
推荐引用方式 GB/T 7714	Pelle T.,Morlighem M.,Bondzio J.H.. Brief communication: PICOP, a new ocean melt parameterization under ice shelves combining PICO and a plume model[J],2019,13(3).
APA	Pelle T.,Morlighem M.,&Bondzio J.H..(2019).Brief communication: PICOP, a new ocean melt parameterization under ice shelves combining PICO and a plume model.The Cryosphere,13(3).
MLA	Pelle T.,et al."Brief communication: PICOP, a new ocean melt parameterization under ice shelves combining PICO and a plume model".The Cryosphere 13.3(2019).