DOI: 10.1002/gbc.20064
Scopus记录号: 2-s2.0-84881525699
论文题名: A joint atmosphere-ocean inversion for the estimation of seasonal carbon sources and sinks
作者: Steinkamp K ; , Gruber N
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 732
结束页码: 745
语种: 英语
英文关键词: air-land flux
; air-sea flux
; atmospheric inversion
; carbon cycle
; carbon sinks and sources
; joint inversion
Scopus关键词: Air sea flux
; Atmospheric inversions
; Carbon cycles
; Carbon sink
; Joint inversion
; Atmospheric chemistry
; Atmospheric movements
; Biospherics
; Carbon
; Carbon dioxide
; Deforestation
; Estimation
; Tropics
; Oceanography
; air-sea interaction
; biosphere
; carbon cycle
; carbon dioxide
; carbon flux
; data set
; deforestation
; dissolved inorganic carbon
; estimation method
; magnitude
; Amazonia
英文摘要: We have estimated global surface fluxes of carbon dioxide for the period 1992-1996 using an inverse approach that sequentially considers four constraints: (1) atmospheric CO2, (2) ocean interior DIC (dissolved inorganic carbon) interpreted through an ocean interior inversion and surface ocean pCO2 (partial pressure of CO2), (3) annual prior fluxes for selected land regions, and (4) atmospheric model selection based on vertical transport skill. Estimated fluxes are monthly resolved for each of the 22 Transcom regions over land and ocean. The ocean constraint is particularly valuable, as it does not only add prior information about air-sea fluxes to the inversion problem but also preserves the regional variance-covariance structure from the underlying ocean interior inversion. It allows to constrain annual oceanic uptake of 1.8 PgCyr-1 to within 0.2 PgCyr-1, which implies a net annual land uptake of 1.3 (±0.3) PgCyr-1. Furthermore, it leads to a pronounced asymmetry in the seasonal pattern of global land uptake, which was not seen in previous atmosphere-only inversions. Tropical land is consistently estimated to be a source of carbon, though the source magnitude is reduced as more constraints are applied. With all four constraints, the inversion suggests a net tropical source of 1.1 (±0.9) PgCyr-1, which is comparable to global estimates of deforestation rates in tropical forests and therefore implies an annually balanced tropical land biosphere flux. This balance is not found, however, at the regional level: For the Amazonian region and after accounting for deforestation, we find a biospheric source of 0.6 (±0.5) PgCyr-1. This is at the upper range of estimates from bottom-up methods, which tend to identify the region as a sink. Key Points Each data constraint has a significant influence on the inverse flux estimatesConclusions drawn from different constraints disagree in some regionsThe Amazonian biosphere is estimated to release 0.6 PgC each year ©2013. 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/77591
Appears in Collections: 气候变化事实与影响
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作者单位: Environmental Physics Group, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland; Now at National Institute of Water and Atmospheric Research, Private Bag 14-901, Wellington 6021, New Zealand
Recommended Citation:
Steinkamp K,, Gruber N. A joint atmosphere-ocean inversion for the estimation of seasonal carbon sources and sinks[J]. Global Biogeochemical Cycles,2013-01-01,27(3)