气候变化领域集成服务门户(CCPortal): Arctic Ocean surface geostrophic circulation 2003

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DOI	10.5194/tc-11-1767-2017
	Arctic Ocean surface geostrophic circulation 2003-2014
	Armitage T.W.K.; Bacon S.; Ridout A.L.; Petty A.A.; Wolbach S.; Tsamados M.
发表日期	2017
ISSN	19940416
卷号	11 期号:4
英文摘要	Monitoring the surface circulation of the ice-covered Arctic Ocean is generally limited in space, time or both. We present a new 12-year record of geostrophic currents at monthly resolution in the ice-covered and ice-free Arctic Ocean derived from satellite radar altimetry and characterise their seasonal to decadal variability from 2003 to 2014, a period of rapid environmental change in the Arctic. Geostrophic currents around the Arctic basin increased in the late 2000s, with the largest increases observed in summer. Currents in the southeastern Beaufort Gyre accelerated in late 2007 with higher current speeds sustained until 2011, after which they decreased to speeds representative of the period 2003–2006. The strength of the northwestward current in the southwest Beaufort Gyre more than doubled between 2003 and 2014. This pattern of changing currents is linked to shifting of the gyre circulation to the northwest during the time period. The Beaufort Gyre circulation and Fram Strait current are strongest in winter, modulated by the seasonal strength of the atmospheric circulation. We find high eddy kinetic energy (EKE) congruent with features of the seafloor bathymetry that are greater in winter than summer, and estimates of EKE and eddy diffusivity in the Beaufort Sea are consistent with those predicted from theoretical considerations. The variability of Arctic Ocean geostrophic circulation highlights the interplay between seasonally variable atmospheric forcing and ice conditions, on a backdrop of long-term changes to the Arctic sea ice–ocean system. Studies point to various mechanisms influencing the observed increase in Arctic Ocean surface stress, and hence geostrophic currents, in the 2000s – e.g. decreased ice concentration/thickness, changing atmospheric forcing, changing ice pack morphology; however, more work is needed to refine the representation of atmosphere–ice–ocean coupling in models before we can fully attribute causality to these increases.
学科领域	atmosphere-ocean system; atmospheric circulation; atmospheric forcing; decadal variation; environmental change; geostrophic flow; gyre; ice thickness; ice-ocean interaction; radar altimetry; satellite altimetry; sea surface; seafloor; seasonal variation; Arctic; Arctic Ocean; Beaufort Sea; Fram Strait
语种	英语
scopus关键词	atmosphere-ocean system; atmospheric circulation; atmospheric forcing; decadal variation; environmental change; geostrophic flow; gyre; ice thickness; ice-ocean interaction; radar altimetry; satellite altimetry; sea surface; seafloor; seasonal variation; Arctic; Arctic Ocean; Beaufort Sea; Fram Strait
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119364
作者单位	Centre for Polar Observation and Modelling, University College London, London, United Kingdom; National Oceanography Centre, Southampton, United Kingdom; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Atmospheric and Oceanic Sciences, University of Maryland, College Park, MD, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Armitage T.W.K.,Bacon S.,Ridout A.L.,et al. Arctic Ocean surface geostrophic circulation 2003-2014[J],2017,11(4).
APA	Armitage T.W.K.,Bacon S.,Ridout A.L.,Petty A.A.,Wolbach S.,&Tsamados M..(2017).Arctic Ocean surface geostrophic circulation 2003–2014.Cryosphere,11(4).
MLA	Armitage T.W.K.,et al."Arctic Ocean surface geostrophic circulation 2003–2014".Cryosphere 11.4(2017).