globalchange  > 气候减缓与适应
DOI: 10.1029/2018JC013888
Scopus记录号: 2-s2.0-85050862931
论文题名:
Radium Isotopes Across the Arctic Ocean Show Time Scales of Water Mass Ventilation and Increasing Shelf Inputs
作者: Rutgers van der Loeff M.; Kipp L.; Charette M.A.; Moore W.S.; Black E.; Stimac I.; Charkin A.; Bauch D.; Valk O.; Karcher M.; Krumpen T.; Casacuberta N.; Smethie W.; Rember R.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:7
起始页码: 4853
结束页码: 4873
语种: 英语
英文关键词: Arctic Ocean ; GEOTRACES ; radium-228 ; thorium-228 ; transpolar drift
英文摘要: The first full transarctic section of 228Ra in surface waters measured during GEOTRACES cruises PS94 and HLY1502 (2015) shows a consistent distribution with maximum activities in the transpolar drift. Activities in the central Arctic have increased from 2007 through 2011 to 2015. The increased 228Ra input is attributed to stronger wave action on shelves resulting from a longer ice-free season. A concomitant decrease in the 228Th/228Ra ratio likely results from more rapid transit of surface waters depleted in 228Th by scavenging over the shelf. The 228Ra activities observed in intermediate waters (<1,500 m) in the Amundsen Basin are explained by ventilation with shelf water on a time scale of about 15–18 years, in good agreement with estimates based on SF6 and 129I/236U. The 228Th excess below the mixed layer up to 1,500 m depth can complement 234Th and 210Po as tracers of export production, after correction for the inherent excess resulting from the similarity of 228Ra and 228Th decay times. We show with a Th/Ra profile model that the 228Th/228Ra ratio below 1,500 m is inappropriate for this purpose because it is a delicate balance between horizontal supply of 228Ra and vertical flux of particulate 228Th. The accumulation of 226Ra in the deep Makarov Basin is not associated with an accumulation of Ba and can therefore be attributed to supply from decay of 230Th in the bottom sediment. We estimate a ventilation time of 480 years for the deep Makarov-Canada Basin, in good agreement with previous estimates using other tracers. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113595
Appears in Collections:气候减缓与适应

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作者单位: Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, Germany; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC, United States; Far Eastern Branch of Russian Academy of Sciences Russian Academy of Sciences (FEBRAS), Pacific Oceanological Institute (POI), Vladivostok, Russian Federation; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Laboratory of Ion Beam Physics, ETH Zurich, Zürich, Switzerland; Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Zürich, Switzerland; Lamont-Doherty Earth Observatory of Columbia University, New York, NY, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States

Recommended Citation:
Rutgers van der Loeff M.,Kipp L.,Charette M.A.,et al. Radium Isotopes Across the Arctic Ocean Show Time Scales of Water Mass Ventilation and Increasing Shelf Inputs[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(7)
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