DOI: 10.1002/2015GB005267
Scopus记录号: 2-s2.0-84973911578
论文题名: On which timescales do gas transfer velocities control North Atlantic CO2 flux variability?
作者: Couldrey M ; P ; , Oliver K ; I ; C ; , Yool A ; , Halloran P ; R ; , Achterberg E ; P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 5 起始页码: 787
结束页码: 802
语种: 英语
英文关键词: carbon cycle
; carbon flux
; climate dynamics
; gas transfer velocity
; ocean model
; variability
Scopus关键词: air-ice interaction
; carbon dioxide
; carbon flux
; carbon sink
; circulation modeling
; climate change
; climate conditions
; concentration (composition)
; gas transport
; solubility
; temporal variation
; timescale
; velocity
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: The North Atlantic is an important basin for the global ocean's uptake of anthropogenic and natural carbon dioxide (CO2), but the mechanisms controlling this carbon flux are not fully understood. The air-sea flux of CO2, F, is the product of a gas transfer velocity, k, the air-sea CO2 concentration gradient, ΔpCO2, and the temperature- and salinity-dependent solubility coefficient, α. k is difficult to constrain, representing the dominant uncertainty in F on short (instantaneous to interannual) timescales. Previous work shows that in the North Atlantic, ΔpCO2 and k both contribute significantly to interannual F variability but that k is unimportant for multidecadal variability. On some timescale between interannual and multidecadal, gas transfer velocity variability and its associated uncertainty become negligible. Here we quantify this critical timescale for the first time. Using an ocean model, we determine the importance of k, ΔpCO2, and α on a range of timescales. On interannual and shorter timescales, both ΔpCO2 and k are important controls on F. In contrast, pentadal to multidecadal North Atlantic flux variability is driven almost entirely by ΔpCO2; k contributes less than 25%. Finally, we explore how accurately one can estimate North Atlantic F without a knowledge of nonseasonal k variability, finding it possible for interannual and longer timescales. These findings suggest that continued efforts to better constrain gas transfer velocities are necessary to quantify interannual variability in the North Atlantic carbon sink. However, uncertainty in k variability is unlikely to limit the accuracy of estimates of longer-term flux variability. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77856
Appears in Collections: 气候变化事实与影响
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作者单位: Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton, United Kingdom; National Oceanography Centre, Southampton, United Kingdom; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; GEOMAR Helmholtz-Zentrum für Ozeanforschung, Kiel, Germany
Recommended Citation:
Couldrey M,P,, Oliver K,et al. On which timescales do gas transfer velocities control North Atlantic CO2 flux variability?[J]. Global Biogeochemical Cycles,2016-01-01,30(5)