DOI: 10.1002/2015GL065669
论文题名: Hydrogen peroxide and superoxide photoproduction in diverse marine waters: A simple proxy for estimating direct CO2 photochemical fluxes
作者: Powers L.C. ; Miller W.L.
刊名: Geophysical Research Letters
ISSN: 0094-9426
EISSN: 1944-9157
出版年: 2015
卷: 42, 期: 18 起始页码: 7696
结束页码: 7704
语种: 英语
英文关键词: carbon dioxide
; hydrogen peroxide
; marine carbon cycling
; photochemistry
; superoxide
Scopus关键词: Biological materials
; Decay (organic)
; Hydrogen peroxide
; Irradiation
; Ocean currents
; Organic carbon
; Oxidation
; Oxygen
; Peroxides
; Photobleaching
; Photochemical reactions
; Photooxidation
; Carbon cycling
; Direct measurement
; Dissolved organic carbon
; Dissolved organic matters
; Photoproduction of h
; Photoproductions
; Production efficiency
; Superoxides
; Carbon dioxide
; carbon cycle
; carbon dioxide
; dissolved organic carbon
; hydrogen peroxide
; irradiation
; marine environment
; nonlinearity
; photochemistry
; proxy climate record
; Atlantic Ocean
; Gulf Stream
英文摘要: The photoproduction of H2O2 and CO2 exhibits a well-defined relationship with an average CO2:H2O2 molar ratio of 6.6-±-1.8 as determined in a variety of marine waters ranging from a dark tidal creek to clear offshore stations near the Gulf Stream. Even when corrected for photobleaching, accumulation of both H2O2 and CO2 was not linear beyond 12-h of constant irradiation, with interval rates indicating that production efficiency for both products decreased with increasing photon dose. Direct measurements of O2 - photoproduction, together with its dark thermal decay to H2O2, indicate that O2 - may be the better proxy for photochemical dissolved organic matter oxidation to CO2. Given the very short irradiation times needed to determine O2 - production rates (~2-5-min), determination of O2 - photoproduction may provide robust estimates for initial CO2 photoproduction rates even in blue water, allowing greatly improved estimates for the global significance of dissolved organic carbon photooxidation. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945242507&doi=10.1002%2f2015GL065669&partnerID=40&md5=68f466d07f58aa33708b93f5ef290603
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9041
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Marine Sciences, University of Georgia, Athens, GA, United States
Recommended Citation:
Powers L.C.,Miller W.L.. Hydrogen peroxide and superoxide photoproduction in diverse marine waters: A simple proxy for estimating direct CO2 photochemical fluxes[J]. Geophysical Research Letters,2015-01-01,42(18).