Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change
Identifieur interne : 002141 ( Istex/Corpus ); précédent : 002140; suivant : 002142Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change
Auteurs : Simon Bélanger ; Huixiang Xie ; Nickolay Krotkov ; Pierre Larouche ; Warwick F. Vincent ; Marcel BabinSource :
- Global Biogeochemical Cycles [ 0886-6236 ] ; 2006-12.
Abstract
Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV‐dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic warming over this region. In this study, we made the first quantitative estimates of photomineralization of tDOM in a coastal Arctic ecosystem under current and future sea ice regimes. We used an optical‐photochemical coupled model incorporating water column optics and experimental measurements of photoproduction of dissolved inorganic carbon (DIC), the main carbon product of DOM photochemistry. Apparent quantum yields of DIC photoproduction were determined on water samples from the Mackenzie River estuary, the Mackenzie Shelf, and Amundsen Gulf. UV irradiances just below the sea surface were estimated by combining satellite backscattered and passive microwave radiance measurements with a radiative transfer model. The mean annual DIC photoproduction between 1979 and 2003 was estimated as 66.5 ± 18.5 Gg carbon in the surface waters of the southeastern Beaufort Sea, where UV absorption is dominated by chromophoric dissolved organic matter discharged by the Mackenzie River. This value is equivalent to 10% of bacterial respiration rates, 8% of new primary production rates and 2.8 ± 0.6% of the 1.3 Tg of dissolved organic carbon (DOC) discharged annually by the Mackenzie River into the area. During periods of reduced ice cover such as 1998, the latter value could rise to 5.1% of the annual riverine DOC discharge. Under an ice‐free scenario, the model predicted that 150.5 Gg of DIC would be photochemically produced, mineralizing 6.2% of the DOC input from the Mackenzie River. These results show that the predicted trend of ongoing contraction of sea ice cover will greatly accelerate the photomineralization of tDOM in Arctic surface waters.
Url:
DOI: 10.1029/2006GB002708
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<front><div type="abstract">Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV‐dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic warming over this region. In this study, we made the first quantitative estimates of photomineralization of tDOM in a coastal Arctic ecosystem under current and future sea ice regimes. We used an optical‐photochemical coupled model incorporating water column optics and experimental measurements of photoproduction of dissolved inorganic carbon (DIC), the main carbon product of DOM photochemistry. Apparent quantum yields of DIC photoproduction were determined on water samples from the Mackenzie River estuary, the Mackenzie Shelf, and Amundsen Gulf. UV irradiances just below the sea surface were estimated by combining satellite backscattered and passive microwave radiance measurements with a radiative transfer model. The mean annual DIC photoproduction between 1979 and 2003 was estimated as 66.5 ± 18.5 Gg carbon in the surface waters of the southeastern Beaufort Sea, where UV absorption is dominated by chromophoric dissolved organic matter discharged by the Mackenzie River. This value is equivalent to 10% of bacterial respiration rates, 8% of new primary production rates and 2.8 ± 0.6% of the 1.3 Tg of dissolved organic carbon (DOC) discharged annually by the Mackenzie River into the area. During periods of reduced ice cover such as 1998, the latter value could rise to 5.1% of the annual riverine DOC discharge. Under an ice‐free scenario, the model predicted that 150.5 Gg of DIC would be photochemically produced, mineralizing 6.2% of the DOC input from the Mackenzie River. These results show that the predicted trend of ongoing contraction of sea ice cover will greatly accelerate the photomineralization of tDOM in Arctic surface waters.</div>
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<abstract>Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV‐dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic warming over this region. In this study, we made the first quantitative estimates of photomineralization of tDOM in a coastal Arctic ecosystem under current and future sea ice regimes. We used an optical‐photochemical coupled model incorporating water column optics and experimental measurements of photoproduction of dissolved inorganic carbon (DIC), the main carbon product of DOM photochemistry. Apparent quantum yields of DIC photoproduction were determined on water samples from the Mackenzie River estuary, the Mackenzie Shelf, and Amundsen Gulf. UV irradiances just below the sea surface were estimated by combining satellite backscattered and passive microwave radiance measurements with a radiative transfer model. The mean annual DIC photoproduction between 1979 and 2003 was estimated as 66.5 ± 18.5 Gg carbon in the surface waters of the southeastern Beaufort Sea, where UV absorption is dominated by chromophoric dissolved organic matter discharged by the Mackenzie River. This value is equivalent to 10% of bacterial respiration rates, 8% of new primary production rates and 2.8 ± 0.6% of the 1.3 Tg of dissolved organic carbon (DOC) discharged annually by the Mackenzie River into the area. During periods of reduced ice cover such as 1998, the latter value could rise to 5.1% of the annual riverine DOC discharge. Under an ice‐free scenario, the model predicted that 150.5 Gg of DIC would be photochemically produced, mineralizing 6.2% of the DOC input from the Mackenzie River. These results show that the predicted trend of ongoing contraction of sea ice cover will greatly accelerate the photomineralization of tDOM in Arctic surface waters.</abstract>
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<abstract><p>Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV‐dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic warming over this region. In this study, we made the first quantitative estimates of photomineralization of tDOM in a coastal Arctic ecosystem under current and future sea ice regimes. We used an optical‐photochemical coupled model incorporating water column optics and experimental measurements of photoproduction of dissolved inorganic carbon (DIC), the main carbon product of DOM photochemistry. Apparent quantum yields of DIC photoproduction were determined on water samples from the Mackenzie River estuary, the Mackenzie Shelf, and Amundsen Gulf. UV irradiances just below the sea surface were estimated by combining satellite backscattered and passive microwave radiance measurements with a radiative transfer model. The mean annual DIC photoproduction between 1979 and 2003 was estimated as 66.5 ± 18.5 Gg carbon in the surface waters of the southeastern Beaufort Sea, where UV absorption is dominated by chromophoric dissolved organic matter discharged by the Mackenzie River. This value is equivalent to 10% of bacterial respiration rates, 8% of new primary production rates and 2.8 ± 0.6% of the 1.3 Tg of dissolved organic carbon (DOC) discharged annually by the Mackenzie River into the area. During periods of reduced ice cover such as 1998, the latter value could rise to 5.1% of the annual riverine DOC discharge. Under an ice‐free scenario, the model predicted that 150.5 Gg of DIC would be photochemically produced, mineralizing 6.2% of the DOC input from the Mackenzie River. These results show that the predicted trend of ongoing contraction of sea ice cover will greatly accelerate the photomineralization of tDOM in Arctic surface waters.</p>
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<abstractGroup><abstract type="main"><p xml:id="gbc1316-para-0005" label="1">Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV‐dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic warming over this region. In this study, we made the first quantitative estimates of photomineralization of tDOM in a coastal Arctic ecosystem under current and future sea ice regimes. We used an optical‐photochemical coupled model incorporating water column optics and experimental measurements of photoproduction of dissolved inorganic carbon (DIC), the main carbon product of DOM photochemistry. Apparent quantum yields of DIC photoproduction were determined on water samples from the Mackenzie River estuary, the Mackenzie Shelf, and Amundsen Gulf. UV irradiances just below the sea surface were estimated by combining satellite backscattered and passive microwave radiance measurements with a radiative transfer model. The mean annual DIC photoproduction between 1979 and 2003 was estimated as 66.5 ± 18.5 Gg carbon in the surface waters of the southeastern Beaufort Sea, where UV absorption is dominated by chromophoric dissolved organic matter discharged by the Mackenzie River. This value is equivalent to 10% of bacterial respiration rates, 8% of new primary production rates and 2.8 ± 0.6% of the 1.3 Tg of dissolved organic carbon (DOC) discharged annually by the Mackenzie River into the area. During periods of reduced ice cover such as 1998, the latter value could rise to 5.1% of the annual riverine DOC discharge. Under an ice‐free scenario, the model predicted that 150.5 Gg of DIC would be photochemically produced, mineralizing 6.2% of the DOC input from the Mackenzie River. These results show that the predicted trend of ongoing contraction of sea ice cover will greatly accelerate the photomineralization of tDOM in Arctic surface waters.</p>
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<mods version="3.6"><titleInfo lang="en"><title>Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change</title>
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<titleInfo type="abbreviated" lang="en"><title>ARCTIC CDOM PHOTOOXIDATION</title>
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<titleInfo type="alternative" contentType="CDATA" lang="en"><title>Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change</title>
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<name type="personal"><namePart type="given">Simon</namePart>
<namePart type="family">Bélanger</namePart>
<affiliation>Laboratoire d'océanographie de Villefranche, Université Pierre et Marie Curie‐Paris, Villefranche‐sur‐Mer, France</affiliation>
<affiliation>Also at Laboratoire d'océanographie de Villefranche, CNRS, Villefranche‐sur‐Mer, France.</affiliation>
<affiliation>E-mail: sbe@obs-vlfr.fr</affiliation>
<role><roleTerm type="text">author</roleTerm>
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<name type="personal"><namePart type="given">Huixiang</namePart>
<namePart type="family">Xie</namePart>
<affiliation>Institut des Sciences de la Mer de Rimouski, Université du Québec à Rimouski, Rimouski, Quebec, Canada</affiliation>
<role><roleTerm type="text">author</roleTerm>
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<name type="personal"><namePart type="given">Nickolay</namePart>
<namePart type="family">Krotkov</namePart>
<affiliation>Goddard Earth Sciences and Technology Center, University of Maryland Baltimore County, Maryland, Baltimore, USA</affiliation>
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<name type="personal"><namePart type="given">Pierre</namePart>
<namePart type="family">Larouche</namePart>
<affiliation>Institut Maurice‐Lamontagne, Pêches et Océans Canada, Mont‐Joli, Quebec, Canada</affiliation>
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<name type="personal"><namePart type="given">Warwick F.</namePart>
<namePart type="family">Vincent</namePart>
<affiliation>Département de Biologie and Centre d'Études Nordiques, Université Laval, Quebec City, Quebec, Canada</affiliation>
<role><roleTerm type="text">author</roleTerm>
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<name type="personal"><namePart type="given">Marcel</namePart>
<namePart type="family">Babin</namePart>
<affiliation>Laboratoire d'océanographie de Villefranche, Université Pierre et Marie Curie‐Paris, Villefranche‐sur‐Mer, France</affiliation>
<affiliation>Also at Laboratoire d'océanographie de Villefranche, CNRS, Villefranche‐sur‐Mer, France.</affiliation>
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<dateIssued encoding="w3cdtf">2006-12</dateIssued>
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<dateValid encoding="w3cdtf">2006-06-28</dateValid>
<edition>Bélanger, S., H. Xie, N. Krotkov, P. Larouche, W. F. Vincent, and M. Babin (2006), Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change, Global Biogeochem. Cycles, 20, GB4005, doi:10.1029/2006GB002708.</edition>
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<abstract>Photomineralization of terrigenous dissolved organic matter (tDOM) in the Arctic Ocean is limited by persistent sea ice cover that reduces the amount of ultraviolet (UV) radiation reaching the underlying water column. UV‐dependent processes are likely to accelerate as a result of shrinking sea ice extent and decreasing ice thickness caused by climatic warming over this region. In this study, we made the first quantitative estimates of photomineralization of tDOM in a coastal Arctic ecosystem under current and future sea ice regimes. We used an optical‐photochemical coupled model incorporating water column optics and experimental measurements of photoproduction of dissolved inorganic carbon (DIC), the main carbon product of DOM photochemistry. Apparent quantum yields of DIC photoproduction were determined on water samples from the Mackenzie River estuary, the Mackenzie Shelf, and Amundsen Gulf. UV irradiances just below the sea surface were estimated by combining satellite backscattered and passive microwave radiance measurements with a radiative transfer model. The mean annual DIC photoproduction between 1979 and 2003 was estimated as 66.5 ± 18.5 Gg carbon in the surface waters of the southeastern Beaufort Sea, where UV absorption is dominated by chromophoric dissolved organic matter discharged by the Mackenzie River. This value is equivalent to 10% of bacterial respiration rates, 8% of new primary production rates and 2.8 ± 0.6% of the 1.3 Tg of dissolved organic carbon (DOC) discharged annually by the Mackenzie River into the area. During periods of reduced ice cover such as 1998, the latter value could rise to 5.1% of the annual riverine DOC discharge. Under an ice‐free scenario, the model predicted that 150.5 Gg of DIC would be photochemically produced, mineralizing 6.2% of the DOC input from the Mackenzie River. These results show that the predicted trend of ongoing contraction of sea ice cover will greatly accelerate the photomineralization of tDOM in Arctic surface waters.</abstract>
<subject><genre>keywords</genre>
<topic>Beaufort Sea</topic>
<topic>CDOM photooxidation</topic>
<topic>global warming</topic>
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<relatedItem type="host"><titleInfo><title>Global Biogeochemical Cycles</title>
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<titleInfo type="abbreviated"><title>Global Biogeochem. Cycles</title>
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<note type="content"> Auxiliary material for this article contains additional text, a table, and two figures. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). See Plugins for a list of applications and supported file formats. Additional file information is provided in the readme.txt. Auxiliary material for this article contains additional text, a table, and two figures. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). See Plugins for a list of applications and supported file formats. Additional file information is provided in the readme.txt. Auxiliary material for this article contains additional text, a table, and two figures. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). See Plugins for a list of applications and supported file formats. Additional file information is provided in the readme.txt. Auxiliary material for this article contains additional text, a table, and two figures. Auxiliary material files may require downloading to a local drive depending on platform, browser, configuration, and size. To open auxiliary materials in a browser, click on the label. To download, Right‐click and select “Save Target As…” (PC) or CTRL‐click and select “Download Link to Disk” (Mac). See Plugins for a list of applications and supported file formats. Additional file information is provided in the readme.txt.Supporting Info Item: readme.txt - Text S1. On the determination of the Apparent Quantum Yield for DIC photoproduction. - Text S2. Figure captions. - Table S1. Comparison of statistical results between the single exponential and quasi‐exponential functional forms. - Figure S1. Absorption spectra of CDOM for before (black line) and after the irradiation for the sample under WG280 cutoff filter (red line). - Figure S2. Modeled versus measured DIC photoproduction rates for the Single exponential (squares) and Quasi‐exponential (circles) functional forms. - Tab‐delimited Table 1. - Tab‐delimited Table 2. - Tab‐delimited Table 3. - Tab‐delimited Table 4. - </note>
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<topic authorityURI="http://psi.agu.org/taxonomy5/0400">BIOGEOSCIENCES</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0428">Carbon cycling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0414">Biogeochemical cycles, processes, and modeling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0442">Estuarine and nearshore processes</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0480">Remote sensing</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0412">Biogeochemical kinetics and reaction modeling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0700">CRYOSPHERE</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/0793">Biogeochemistry</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/1600">GLOBAL CHANGE</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/1615">Biogeochemical cycles, processes, and modeling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4200">OCEANOGRAPHY: GENERAL</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4235">Estuarine processes</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4800">OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4806">Carbon cycling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4805">Biogeochemical cycles, processes, and modeling</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4900">PALEOCEANOGRAPHY</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/4912">Biogeochemical cycles, processes, and modeling</topic>
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<identifier type="ISSN">0886-6236</identifier>
<identifier type="eISSN">1944-9224</identifier>
<identifier type="DOI">10.1002/(ISSN)1944-9224</identifier>
<identifier type="CODEN">GBCYEP</identifier>
<identifier type="PublisherID">GBC</identifier>
<part><date>2006</date>
<detail type="volume"><caption>vol.</caption>
<number>20</number>
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<detail type="issue"><caption>no.</caption>
<number>4</number>
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<identifier type="DOI">10.1029/2006GB002708</identifier>
<identifier type="ArticleID">2006GB002708</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright 2006 by the American Geophysical Union.</accessCondition>
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