气候变化领域集成服务门户(CCPortal): Interactions between increasing CO2 and antarctic melt rates

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DOI	10.1175/JCLI-D-19-0882.1
	Interactions between increasing CO2 and antarctic melt rates
	Mackie S.; Smith I.J.; Stevens D.P.; Ridley J.K.; Langhorne P.J.
发表日期	2020
ISSN	0894-8755
起始页码	8939
结束页码	89856
卷号	33 期号:20
英文摘要	Meltwater from the Antarctic ice sheet is expected to increase the sea ice extent. However, such an expansion may be moderated by sea ice decline associated with global warming. Here we investigate the relative balance of these two processes through experiments using HadGEM3-GC3.1 and compare these to two standard idealized CMIP6 experiments. Our results show that the decline in sea ice projected under scenarios of increasing CO2 may be inhibited by simultaneously increasing melt fluxes. We find that Antarctic Bottom Water formation, projected to decline as CO2 increases, is likely to decline further with an increasing meltwater flux. In our simulations, the response of the westerly wind jet to increasing CO2 is enhanced when the meltwater flux increases, resulting in a stronger peak wind stress than is found when either CO2 or melt rates increase exclusively. We find that the sensitivity of the Antarctic Circumpolar Current to increasing melt fluxes in the Southern Ocean is countered by increasing CO2, removing or reducing a feedback mechanism that may otherwise allow more heat to be transported to the polar regions and drive increasing ice shelf melt rates. The insights presented here and in a companion paper (which focuses on the effect of increasing melt fluxes under preindustrial forcings) provide insights helpful to the interpretation of both future climate projections and sensitivity studies into the effect of increasing melt fluxes from the Antarctic ice sheet when different forcing scenarios are used. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Glaciers; Global warming; Ocean currents; Sea ice; Antarctic Bottom Water; Antarctic Circumpolar Currents; Antarctic ice sheets; Feedback mechanisms; Future climate projections; Meltwater fluxes; Sensitivity studies; Westerly winds; Carbon dioxide; Antarctic Bottom Water; Antarctic Circumpolar Wave; carbon dioxide; climate modeling; feedback mechanism; global warming; meltwater; sea ice; Antarctic Ice Sheet; Antarctica; Southern Ocean
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171529
作者单位	Department of Physics, University of Otago, Dunedin, New Zealand; School of Mathematics, University of East Anglia, Norwich, United Kingdom; Met Office, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Mackie S.,Smith I.J.,Stevens D.P.,et al. Interactions between increasing CO2 and antarctic melt rates[J],2020,33(20).
APA	Mackie S.,Smith I.J.,Stevens D.P.,Ridley J.K.,&Langhorne P.J..(2020).Interactions between increasing CO2 and antarctic melt rates.Journal of Climate,33(20).
MLA	Mackie S.,et al."Interactions between increasing CO2 and antarctic melt rates".Journal of Climate 33.20(2020).