DOI: 10.1002/grl.50251
论文题名: Estimating changes in ocean ventilation from early 1990s CFC-12 and late 2000s SF6 measurements
作者: Tanhua T. ; Waugh D.W. ; Bullister J.L.
刊名: Geophysical Research Letters
ISSN: 0094-9257
EISSN: 1944-8988
出版年: 2013
卷: 40, 期: 5 起始页码: 927
结束页码: 932
语种: 英语
英文关键词: ocean ventilation
; repeat hydrography
; transient tracers
Scopus关键词: North Atlantic Ocean
; Observational method
; Ocean ventilations
; repeat hydrography
; Time lag
; Time-scales
; Tracer ages
; Transient tracers
; Carbon dioxide
; Chlorofluorocarbons
; Mixing
; Sulfur hexafluoride
; Ventilation
; Oceanography
; biogeochemistry
; CFC
; data set
; estimation method
; mixing
; timescale
; tracer
; Atlantic Ocean
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (South)
英文摘要: Transient tracer measurements can constrain the rates and pathways of ocean ventilation and act as proxies for biogeochemically relevant gases such as CO2 and oxygen. Various techniques have deduced changes in ocean ventilation over decadal timescales using transient tracer measurements made on repeat sections, but these require a priori assumptions about mixing in the ocean interior. Here, we introduce a simple, direct observational method that takes advantage of the similar atmospheric increase rates of chlorofluorocarbon-12 and sulfur hexafluoride, but with a time lag (offset) of 14-15 years. Such repeat measurements can be directly compared without prior assumptions about mixing. A difference larger than ∼2 years between modern sulfur hexafluoride and historical chlorofluorocarbon-12 tracer ages implies a change in ventilation, although lack of difference does not necessarily imply no change. Several tracer data sets are presented, which suggest changes in ventilation in the South Pacific and North Atlantic Oceans. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876815060&doi=10.1002%2fgrl.50251&partnerID=40&md5=35d5966c16a5165c81393dfd4012ec47
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6521
Appears in Collections: 气候减缓与适应
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany
Recommended Citation:
Tanhua T.,Waugh D.W.,Bullister J.L.. Estimating changes in ocean ventilation from early 1990s CFC-12 and late 2000s SF6 measurements[J]. Geophysical Research Letters,2013-01-01,40(5).