DOI: 10.1002/2014GB004850
Scopus记录号: 2-s2.0-84903872415
论文题名: Sunlight-induced carbon dioxide emissions from inland waters
作者: Koehler B ; , Landelius T ; , Weyhenmeyer G ; A ; , Machida N ; , Tranvik L ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 7 起始页码: 696
结束页码: 711
语种: 英语
英文关键词: apparent quantum yield
; carbon dioxide
; global carbon cycle
; inland waters
; photochemical mineralization
; photochemistry
Scopus关键词: Global warming
; Lakes
; Photochemical reactions
; Photons
; Quantum yield
; Reservoirs (water)
; Sediments
; Atmospheric radiative transfer models
; Carbon dioxide emissions
; Dissolved inorganic carbon
; Dissolved organic carbon
; Global carbon cycle
; Inland waters
; Photochemical mineralization
; Spatial and temporal scale
; Carbon dioxide
; burial (geology)
; carbon cycle
; carbon dioxide
; carbon emission
; decomposition
; dissolved inorganic carbon
; lacustrine deposit
; mineralization
; photochemistry
; radiative transfer
; solar radiation
; Sweden
英文摘要: The emissions of carbon dioxide (CO2) from inland waters are substantial on a global scale. Yet the fundamental question remains open which proportion of these CO2 emissions is induced by sunlight via photochemical mineralization of dissolved organic carbon (DOC), rather than by microbial respiration during DOC decomposition. Also, it is unknown on larger spatial and temporal scales how photochemical mineralization compares to other C fluxes in the inland water C cycle. We combined field and laboratory data with atmospheric radiative transfer modeling to parameterize a photochemical rate model for each day of the year 2009, for 1086 lakes situated between latitudes from 55°N to 69°N in Sweden. The sunlight-induced production of dissolved inorganic carbon (DIC) averaged 3.8-±-0.04-g C m -2-yr-1, which is a flux comparable in size to the organic carbon burial in the lake sediments. Countrywide, 151-±-1 kt C yr -1 was produced by photochemical mineralization, corresponding to about 12% of total annual mean CO2 emissions from Swedish lakes. With a median depth of 3.2-m, the lakes were generally deep enough that incoming, photochemically active photons were absorbed in the water column. This resulted in a linear positive relationship between DIC photoproduction and the incoming photon flux, which corresponds to the absorbed photons. Therefore, the slope of the regression line represents the wavelength- and depth-integrated apparent quantum yield of DIC photoproduction. We used this relationship to obtain a first estimate of DIC photoproduction in lakes and reservoirs worldwide. Global DIC photoproduction amounted to 13 and 35 Mt C yr-1 under overcast and clear sky, respectively. Consequently, these directly sunlight-induced CO2 emissions contribute up to about one tenth to the global CO 2 emissions from lakes and reservoirs, corroborating that microbial respiration contributes a substantially larger share than formerly thought, and generate annual C fluxes similar in magnitude to the C burial in natural lake sediments worldwide. Key Points Approximately 12% of the CO2 emissions from Swedish lakes are directly sunlight induced This carbon flux is similar in size to the OC burial in the sediments Up to 10% of the global CO2 emissions from inland waters are sunlight induced ©2014. 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/77507
Appears in Collections: 气候变化事实与影响
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作者单位: Ecology and Genetics/Limnology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden; Atmospheric Remote Sensing, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden
Recommended Citation:
Koehler B,, Landelius T,, Weyhenmeyer G,et al. Sunlight-induced carbon dioxide emissions from inland waters[J]. Global Biogeochemical Cycles,2014-01-01,28(7)