Warm Circumpolar Deep Water transport toward Antarctica driven by local dense water export in canyons

被引：107

作者：

Morrison, A. K. ^{[1
,2
]}

Hogg, A. McC ^{[1
,2
]}

England, M. H. ^{[3
,4
]}

Spence, P. ^{[3
,4
]}

机构：

[1] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia

[2] Australian Natl Univ, ARC Ctr Excellence Climate Extremes, Canberra, ACT, Australia

[3] Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia

[4] Univ New South Wales, ARC Ctr Excellence Climate Extremes, Sydney, NSW, Australia

来源：

SCIENCE ADVANCES | 2020年 / 6卷 / 18期

基金：

澳大利亚研究理事会;

关键词：

CROSS-SHELF EXCHANGE; BOTTOM WATER; OCEAN; HEAT; EDDY; VARIABILITY; CIRCULATION; RESOLUTION; MESOSCALE;

D O I：

10.1126/sciadv.aav2516

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Poleward transport of warm Circumpolar Deep Water (CDW) has been linked to melting of Antarctic ice shelves. However, even the steady-state spatial distribution and mechanisms of CDW transport remain poorly understood. Using a global, eddying ocean model, we explore the relationship between the cross-slope transports of CDW and descending Dense Shelf Water (DSW). We find large spatial variability in CDW heat and volume transport around Antarctica, with substantially enhanced flow where DSW descends in canyons. The CDW and DSW transports are highly spatially correlated within similar to 20 km and temporally correlated on subdaily time scales. Focusing on the Ross Sea, we show that the relationship is driven by pulses of overflowing DSW lowering sea surface height, leading to net onshore CDW transport. The majority of simulated onshore CDW transport is concentrated in cold-water regions, rather than warm-water regions, with potential implications for ice-ocean interactions and global sea level rise.

引用

页数：9

共 41 条

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