DOI: 10.1002/2015GB005110
Scopus记录号: 2-s2.0-84946562325
论文题名: Seasonal and interannual variability of sea-air CO2 fluxes in the tropical Atlantic affected by the Amazon River plume
作者: Ibánhez J ; S ; P ; , Diverrès D ; , Araujo M ; , Lefèvre N
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 10 起始页码: 1640
结束页码: 1655
语种: 英语
英文关键词: Amazon River plume
; NBC
; NEC
; NECC
; sea-air CO2 flux
; tropical Atlantic
Scopus关键词: air-sea interaction
; annual variation
; carbon dioxide
; carbon flux
; fugacity
; oceanic current
; river plume
; seasonal variation
; water mass
; Amazon River
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; France
; French Guiana
英文摘要: CO2 fugacities obtained from a merchant ship sailing from France to French Guyana were used to explore the seasonal and interannual variability of the sea-air CO2 exchange in the western tropical North Atlantic (TNA; 5-14-N, 41-52-W). Two distinct oceanic water masses were identified in the area associated to the main surface currents, i.e., the North Brazil Current (NBC) and the North Equatorial Current (NEC). The NBC was characterized by permanent CO2 oversaturation throughout the studied period, contrasting with the seasonal pattern identified in the NEC. The NBC retroflection was the main contributor to the North Equatorial Counter Current (NECC), thus spreading into the central TNA, the Amazon River plume, and the CO2-rich waters probably originated from the equatorial upwelling. Strong CO2 undersaturation was associated to the Amazon River plume. Total inorganic carbon drawdown due to biological activity was estimated to be 154 μmol kg-1 within the river plume. As a consequence, the studied area acted as a net sink of atmospheric CO2 (from -72.2 ± 10.2 mmol m-2 month-1 in February to 14.3 ± 4.5 mmol m-2 month-1 in May). This contrasted with the net CO2 efflux estimated by the main global sea-air CO2 flux climatologies. Interannual sea surface temperature changes in the TNA caused by large-scale climatic events could determine the direction and intensity of the sea-air CO2 fluxes in the NEC. Positive temperature anomalies observed in the TNA led to an almost permanent CO2 outgassing in the NEC in 2010. ©2015. 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/77914
Appears in Collections: 气候变化事实与影响
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作者单位: Institut de Recherche Pour le Développement, Brasília-DF, Brazil; Department of Oceanography, Center for Risk Analysis and Environmental Modeling, Federal University of Pernambuco, Recife PE, Brazil; US 191, Centre IRD de Bretagne, Plouzané, France; IRD-LOCEAN, Sorbonne Universités (Université Pierre et Marie Curie-CNRS-MNHN), Paris, France
Recommended Citation:
Ibánhez J,S,P,et al. Seasonal and interannual variability of sea-air CO2 fluxes in the tropical Atlantic affected by the Amazon River plume[J]. Global Biogeochemical Cycles,2015-01-01,29(10)