DOI: 10.1002/2013GL058921
论文题名: Freshening drives contraction of Antarctic Bottom Water in the Australian Antarctic Basin
作者: Van Wijk E.M. ; Rintoul S.R.
刊名: Geophysical Research Letters
ISSN: 0094-10298
EISSN: 1944-10029
出版年: 2014
卷: 41, 期: 5 起始页码: 1657
结束页码: 1664
语种: 英语
英文关键词: Antarctic Bottom Water
; Australian Antarctic Basin
; density changes
; freshening
; oxygen
; water mass change
Scopus关键词: Earth sciences
; Geophysics
; Antarctic Bottom Water
; Australian-antarctic basins
; Density change
; freshening
; Water mass
; Oxygen
; Antarctic Bottom Water
; density front
; oxygen
; potential temperature
; salinity
; water exchange
; water mass
; Southern Ocean
英文摘要: Antarctic Bottom Water (AABW) in the Australian Antarctic Basin has become fresher and lighter since the late 1960s, with largest changes observed near the sources of AABW. The volume of AABW with neutral density (γn) > 28.30 kg m-3 decreased by ≥50% between 1969-1971 and 2008-2012, thinning at a rate of >100 m per decade. Contraction of dense AABW was balanced primarily by expansion of water lighter than γn = 28.15 kg m-3 prior to 1995 and by inflation of less dense classes of AABW after 1995. Oxygen concentrations remained unchanged in the densest AABW and increased on neutral surfaces for AABW with γn > 28.31 kg m-3, between 1995 and 2011-2012, consistent with continued ventilation over this time period. The observed changes in potential temperature, salinity, density, volume, and oxygen of AABW can be accounted for by freshening of the source waters but cannot be explained by changes in formation rate alone. Key Points Freshening drives contraction of Antarctic Bottom Water (AABW) AABW has contracted by about 50% and thinned more than 100 m per decade since 1970 Small increase in oxygen on isopycnals suggests continued ventilation of AABW ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895855021&doi=10.1002%2f2013GL058921&partnerID=40&md5=c2bca442491719db8242ca28aa8425cf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7562
Appears in Collections: 气候减缓与适应
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作者单位: CSIRO Marine and Atmospheric Research, Hobart TAS, Australia
Recommended Citation:
Van Wijk E.M.,Rintoul S.R.. Freshening drives contraction of Antarctic Bottom Water in the Australian Antarctic Basin[J]. Geophysical Research Letters,2014-01-01,41(5).