DOI: 10.1002/2013GL058036
论文题名: Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems
作者: Gregor L. ; Monteiro P.M.S.
刊名: Geophysical Research Letters
ISSN: 0094-8449
EISSN: 1944-8180
出版年: 2013
卷: 40, 期: 20 起始页码: 5429
结束页码: 5434
语种: 英语
英文关键词: Benguela
; eastern boundary current
; marine biogeochemistry
; total alkalinity
Scopus关键词: Benguela
; Biogeochemical process
; Dissolved inorganic carbon
; Eastern boundary current
; Marine biogeochemistries
; Oxygen minimum zone
; Total alkalinities
; Upwelling systems
; Biogeochemistry
; Denitrification
; Nutrients
; pH
; Stoichiometry
; Carbon dioxide
; alkalinity
; biogeochemical cycle
; biogeochemistry
; carbon dioxide
; carbonate system
; denitrification
; dissolved inorganic carbon
; eastern boundary current
; nitrate
; oxygen minimum layer
; phosphate
; reconstruction
; Redfield ratio
; seasonal variation
; stoichiometry
; upwelling
; Angola
; Benguela
英文摘要: In this study we use the southern Benguela upwelling system to investigate the role of nutrient and carbon stoichiometry on carbonate dynamics in eastern boundary upwelling systems. Six months in 2010 were sampled along a cross-shelf transect. Data were classified into summer, autumn, and winter. Nitrate, phosphate, dissolved inorganic carbon, and total alkalinity ratios were used in a stoichiometric reconstruction model to determine the contribution of biogeochemical processes on a parcel of water as it upwelled. Deviations from the Redfield ratio were dominated by denitrification and sulfate reduction in the subsurface waters. The N:P ratio was lowest (7.2) during autumn once anoxic waters had formed. Total alkalinity (TA) generation by anaerobic remineralization decreased pCO2 by 227 μatm. Ventilation during summer and winter resulted in elevated N:P ratios (12.3). We propose that anaerobic production of TA has an important regional effect in mitigating naturally high CO2 and making upwelled waters less corrosive. Key Points Nutrient ratios used to reconstruct the contribution of biogeochemical processes A seasonal oxygen minimum zone during autumn caused anaerobic remineralisation Alkalinity production primarily by denitrification resulted in buffered CO2 ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885505198&doi=10.1002%2f2013GL058036&partnerID=40&md5=1a4fddfcd731e82fc0a6b83c23b9be74
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5713
Appears in Collections: 气候减缓与适应
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作者单位: Department of Oceanography, University of Cape Town, RW James Bldg., Residence Rd., Cape Town, Western Cape, 7700, South Africa
Recommended Citation:
Gregor L.,Monteiro P.M.S.. Seasonal cycle of N:P:TA stoichiometry as a modulator of CO2 buffering in eastern boundary upwelling systems[J]. Geophysical Research Letters,2013-01-01,40(20).