Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean
The fate of terrigenous dissolved organic carbon (tDOC) delivered to the Arctic Ocean by rivers remains poorly constrained on both spatial and temporal scales. Early reports suggested Arctic tDOC was refractory to degradation, while recent studies have shown tDOC removal to be an active but slow pro...
Gespeichert in:
| Veröffentlicht in: | Marine chemistry 2011-01, Vol.123 (1), p.78-87 |
|---|---|
| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 87 |
|---|---|
| container_issue | 1 |
| container_start_page | 78 |
| container_title | Marine chemistry |
| container_volume | 123 |
| creator | Letscher, Robert T. Hansell, Dennis A. Kadko, David |
| description | The fate of terrigenous dissolved organic carbon (tDOC) delivered to the Arctic Ocean by rivers remains poorly constrained on both spatial and temporal scales. Early reports suggested Arctic tDOC was refractory to degradation, while recent studies have shown tDOC removal to be an active but slow process. Here we present observations of DOC, salinity, δ
18O, and
228Ra/
226Ra in the Polar Surface Layer (PSL) over the outer East Siberian/Chukchi shelf and the adjacent Makarov and Eurasian basins of the eastern Arctic Ocean. This off-shelf system receives meteoric water, introduced by rivers, after a few years residence on the shelf. Elevated concentrations of DOC (>
120
μM
C) were observed in low salinity (~
27) water over the Makarov Basin, suggesting inputs of tDOC-enriched river water to the source waters of the Transpolar Drift. The regression of DOC against salinity indicated an apparent tDOC concentration of 315
±
7
μM
C in the river water fraction, which is significantly lower than the estimated DOC concentration in the riverine sources to the region (724
±
55
μM
C). To obtain the timescale of removal, estimates of shelf residence were coupled with measurements of dissolved
228Ra/
226Ra, an isotopic tracer of time since shelf residence. Shelf residence time coupled with DOC distributions indicates a first order tDOC removal rate constant, λ
=
0.24
±
0.07
yr
-1, for the eastern Arctic, 2.5–4 times higher than rates previously observed in the western Arctic. The observed removal of tDOC in the eastern Arctic occurs over the expansive shelf area, highlighting the initial lability of tDOC upon delivery to the Arctic Ocean, and suggests that tDOC is composed of multiple compartments defined by reactivity. The relatively rapid remineralization of tDOC on the shelves may mitigate the strength of the Arctic Ocean atmospheric CO
2 sink if a projected increase in labile tDOC flux occurs.
►Non-conservative tDOC behavior results in net DOC removal across Eurasian Arctic Shelves.►tDOC first order decay constant λ
=
0.24
yr
−1 for eastern Arctic shelves.►Differing tDOC decay constants between shelves and interior ocean suggest multi-compartment model for tDOC lability.►Remineralization of tDOC over Arctic shelves may mitigate strength of Arctic atmospheric CO
2 sink. |
| doi_str_mv | 10.1016/j.marchem.2010.10.002 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_860382848</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0304420310001052</els_id><sourcerecordid>1762119398</sourcerecordid><originalsourceid>FETCH-LOGICAL-a427t-249fca5b823a33863732078ce90b6591b6aea5fbec166d3247c224c60b3945a93</originalsourceid><addsrcrecordid>eNqFkE2LE0EQhhtRMK7-BKEvopeJ_THTHydZltVdWFgQPTc1NTWbDpPp2D0J-O_tbIJHPRW8PG8V9TD2Xoq1FNJ83q53kHFDu7USz9laCPWCraSzqrGdky_ZSmjRNq0S-jV7U8pWCGF051cMv8M-DjzTLh1h4mnkC-Ucn2hOh8KHWEqajjTwlJ9gjsgRcp9mno6U-bIhfnvIUCLMvGyoguV5Q82vMy4Vf0SC-S17NcJU6N1lXrGfX29_3Nw1D4_f7m-uHxpolV0a1foRoeud0qC1M9pqJaxD8qI3nZe9AYJu7AmlMYNWrUWlWjSi177twOsr9vG8d5_TrwOVJexiQZommKl-E5wR2inXukp--icprVFSeu1PaHdGMadSMo1hn2P1_TtIEU76wzZc9IeT_lNc9dfeh8sJKAjTmGHGWP6Wlbaq89ZU7suZo2rmGCmHgpFmpCFmwiUMKf7n0h_w6p1P</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1762119398</pqid></control><display><type>article</type><title>Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean</title><source>Elsevier ScienceDirect Journals</source><creator>Letscher, Robert T. ; Hansell, Dennis A. ; Kadko, David</creator><creatorcontrib>Letscher, Robert T. ; Hansell, Dennis A. ; Kadko, David</creatorcontrib><description>The fate of terrigenous dissolved organic carbon (tDOC) delivered to the Arctic Ocean by rivers remains poorly constrained on both spatial and temporal scales. Early reports suggested Arctic tDOC was refractory to degradation, while recent studies have shown tDOC removal to be an active but slow process. Here we present observations of DOC, salinity, δ
18O, and
228Ra/
226Ra in the Polar Surface Layer (PSL) over the outer East Siberian/Chukchi shelf and the adjacent Makarov and Eurasian basins of the eastern Arctic Ocean. This off-shelf system receives meteoric water, introduced by rivers, after a few years residence on the shelf. Elevated concentrations of DOC (>
120
μM
C) were observed in low salinity (~
27) water over the Makarov Basin, suggesting inputs of tDOC-enriched river water to the source waters of the Transpolar Drift. The regression of DOC against salinity indicated an apparent tDOC concentration of 315
±
7
μM
C in the river water fraction, which is significantly lower than the estimated DOC concentration in the riverine sources to the region (724
±
55
μM
C). To obtain the timescale of removal, estimates of shelf residence were coupled with measurements of dissolved
228Ra/
226Ra, an isotopic tracer of time since shelf residence. Shelf residence time coupled with DOC distributions indicates a first order tDOC removal rate constant, λ
=
0.24
±
0.07
yr
-1, for the eastern Arctic, 2.5–4 times higher than rates previously observed in the western Arctic. The observed removal of tDOC in the eastern Arctic occurs over the expansive shelf area, highlighting the initial lability of tDOC upon delivery to the Arctic Ocean, and suggests that tDOC is composed of multiple compartments defined by reactivity. The relatively rapid remineralization of tDOC on the shelves may mitigate the strength of the Arctic Ocean atmospheric CO
2 sink if a projected increase in labile tDOC flux occurs.
►Non-conservative tDOC behavior results in net DOC removal across Eurasian Arctic Shelves.►tDOC first order decay constant λ
=
0.24
yr
−1 for eastern Arctic shelves.►Differing tDOC decay constants between shelves and interior ocean suggest multi-compartment model for tDOC lability.►Remineralization of tDOC over Arctic shelves may mitigate strength of Arctic atmospheric CO
2 sink.</description><identifier>ISSN: 0304-4203</identifier><identifier>EISSN: 1872-7581</identifier><identifier>DOI: 10.1016/j.marchem.2010.10.002</identifier><identifier>CODEN: MRCHBD</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Arctic Ocean ; Atmospherics ; Carbon ; Decay ; Dissolution ; DOC ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Freshwater ; Geochemistry ; Marine ; Mineralogy ; Physical and chemical properties of sea water ; Physics of the oceans ; Radium isotopes ; Rivers ; Salinity ; Shelves ; Silicates ; Terrigenous DOC ; Water geochemistry</subject><ispartof>Marine chemistry, 2011-01, Vol.123 (1), p.78-87</ispartof><rights>2010 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a427t-249fca5b823a33863732078ce90b6591b6aea5fbec166d3247c224c60b3945a93</citedby><cites>FETCH-LOGICAL-a427t-249fca5b823a33863732078ce90b6591b6aea5fbec166d3247c224c60b3945a93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0304420310001052$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23725976$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Letscher, Robert T.</creatorcontrib><creatorcontrib>Hansell, Dennis A.</creatorcontrib><creatorcontrib>Kadko, David</creatorcontrib><title>Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean</title><title>Marine chemistry</title><description>The fate of terrigenous dissolved organic carbon (tDOC) delivered to the Arctic Ocean by rivers remains poorly constrained on both spatial and temporal scales. Early reports suggested Arctic tDOC was refractory to degradation, while recent studies have shown tDOC removal to be an active but slow process. Here we present observations of DOC, salinity, δ
18O, and
228Ra/
226Ra in the Polar Surface Layer (PSL) over the outer East Siberian/Chukchi shelf and the adjacent Makarov and Eurasian basins of the eastern Arctic Ocean. This off-shelf system receives meteoric water, introduced by rivers, after a few years residence on the shelf. Elevated concentrations of DOC (>
120
μM
C) were observed in low salinity (~
27) water over the Makarov Basin, suggesting inputs of tDOC-enriched river water to the source waters of the Transpolar Drift. The regression of DOC against salinity indicated an apparent tDOC concentration of 315
±
7
μM
C in the river water fraction, which is significantly lower than the estimated DOC concentration in the riverine sources to the region (724
±
55
μM
C). To obtain the timescale of removal, estimates of shelf residence were coupled with measurements of dissolved
228Ra/
226Ra, an isotopic tracer of time since shelf residence. Shelf residence time coupled with DOC distributions indicates a first order tDOC removal rate constant, λ
=
0.24
±
0.07
yr
-1, for the eastern Arctic, 2.5–4 times higher than rates previously observed in the western Arctic. The observed removal of tDOC in the eastern Arctic occurs over the expansive shelf area, highlighting the initial lability of tDOC upon delivery to the Arctic Ocean, and suggests that tDOC is composed of multiple compartments defined by reactivity. The relatively rapid remineralization of tDOC on the shelves may mitigate the strength of the Arctic Ocean atmospheric CO
2 sink if a projected increase in labile tDOC flux occurs.
►Non-conservative tDOC behavior results in net DOC removal across Eurasian Arctic Shelves.►tDOC first order decay constant λ
=
0.24
yr
−1 for eastern Arctic shelves.►Differing tDOC decay constants between shelves and interior ocean suggest multi-compartment model for tDOC lability.►Remineralization of tDOC over Arctic shelves may mitigate strength of Arctic atmospheric CO
2 sink.</description><subject>Arctic Ocean</subject><subject>Atmospherics</subject><subject>Carbon</subject><subject>Decay</subject><subject>Dissolution</subject><subject>DOC</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Freshwater</subject><subject>Geochemistry</subject><subject>Marine</subject><subject>Mineralogy</subject><subject>Physical and chemical properties of sea water</subject><subject>Physics of the oceans</subject><subject>Radium isotopes</subject><subject>Rivers</subject><subject>Salinity</subject><subject>Shelves</subject><subject>Silicates</subject><subject>Terrigenous DOC</subject><subject>Water geochemistry</subject><issn>0304-4203</issn><issn>1872-7581</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNqFkE2LE0EQhhtRMK7-BKEvopeJ_THTHydZltVdWFgQPTc1NTWbDpPp2D0J-O_tbIJHPRW8PG8V9TD2Xoq1FNJ83q53kHFDu7USz9laCPWCraSzqrGdky_ZSmjRNq0S-jV7U8pWCGF051cMv8M-DjzTLh1h4mnkC-Ucn2hOh8KHWEqajjTwlJ9gjsgRcp9mno6U-bIhfnvIUCLMvGyoguV5Q82vMy4Vf0SC-S17NcJU6N1lXrGfX29_3Nw1D4_f7m-uHxpolV0a1foRoeud0qC1M9pqJaxD8qI3nZe9AYJu7AmlMYNWrUWlWjSi177twOsr9vG8d5_TrwOVJexiQZommKl-E5wR2inXukp--icprVFSeu1PaHdGMadSMo1hn2P1_TtIEU76wzZc9IeT_lNc9dfeh8sJKAjTmGHGWP6Wlbaq89ZU7suZo2rmGCmHgpFmpCFmwiUMKf7n0h_w6p1P</recordid><startdate>20110120</startdate><enddate>20110120</enddate><creator>Letscher, Robert T.</creator><creator>Hansell, Dennis A.</creator><creator>Kadko, David</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>20110120</creationdate><title>Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean</title><author>Letscher, Robert T. ; Hansell, Dennis A. ; Kadko, David</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a427t-249fca5b823a33863732078ce90b6591b6aea5fbec166d3247c224c60b3945a93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Arctic Ocean</topic><topic>Atmospherics</topic><topic>Carbon</topic><topic>Decay</topic><topic>Dissolution</topic><topic>DOC</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Freshwater</topic><topic>Geochemistry</topic><topic>Marine</topic><topic>Mineralogy</topic><topic>Physical and chemical properties of sea water</topic><topic>Physics of the oceans</topic><topic>Radium isotopes</topic><topic>Rivers</topic><topic>Salinity</topic><topic>Shelves</topic><topic>Silicates</topic><topic>Terrigenous DOC</topic><topic>Water geochemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Letscher, Robert T.</creatorcontrib><creatorcontrib>Hansell, Dennis A.</creatorcontrib><creatorcontrib>Kadko, David</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Marine chemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Letscher, Robert T.</au><au>Hansell, Dennis A.</au><au>Kadko, David</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean</atitle><jtitle>Marine chemistry</jtitle><date>2011-01-20</date><risdate>2011</risdate><volume>123</volume><issue>1</issue><spage>78</spage><epage>87</epage><pages>78-87</pages><issn>0304-4203</issn><eissn>1872-7581</eissn><coden>MRCHBD</coden><abstract>The fate of terrigenous dissolved organic carbon (tDOC) delivered to the Arctic Ocean by rivers remains poorly constrained on both spatial and temporal scales. Early reports suggested Arctic tDOC was refractory to degradation, while recent studies have shown tDOC removal to be an active but slow process. Here we present observations of DOC, salinity, δ
18O, and
228Ra/
226Ra in the Polar Surface Layer (PSL) over the outer East Siberian/Chukchi shelf and the adjacent Makarov and Eurasian basins of the eastern Arctic Ocean. This off-shelf system receives meteoric water, introduced by rivers, after a few years residence on the shelf. Elevated concentrations of DOC (>
120
μM
C) were observed in low salinity (~
27) water over the Makarov Basin, suggesting inputs of tDOC-enriched river water to the source waters of the Transpolar Drift. The regression of DOC against salinity indicated an apparent tDOC concentration of 315
±
7
μM
C in the river water fraction, which is significantly lower than the estimated DOC concentration in the riverine sources to the region (724
±
55
μM
C). To obtain the timescale of removal, estimates of shelf residence were coupled with measurements of dissolved
228Ra/
226Ra, an isotopic tracer of time since shelf residence. Shelf residence time coupled with DOC distributions indicates a first order tDOC removal rate constant, λ
=
0.24
±
0.07
yr
-1, for the eastern Arctic, 2.5–4 times higher than rates previously observed in the western Arctic. The observed removal of tDOC in the eastern Arctic occurs over the expansive shelf area, highlighting the initial lability of tDOC upon delivery to the Arctic Ocean, and suggests that tDOC is composed of multiple compartments defined by reactivity. The relatively rapid remineralization of tDOC on the shelves may mitigate the strength of the Arctic Ocean atmospheric CO
2 sink if a projected increase in labile tDOC flux occurs.
►Non-conservative tDOC behavior results in net DOC removal across Eurasian Arctic Shelves.►tDOC first order decay constant λ
=
0.24
yr
−1 for eastern Arctic shelves.►Differing tDOC decay constants between shelves and interior ocean suggest multi-compartment model for tDOC lability.►Remineralization of tDOC over Arctic shelves may mitigate strength of Arctic atmospheric CO
2 sink.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.marchem.2010.10.002</doi><tpages>10</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0304-4203 |
| ispartof | Marine chemistry, 2011-01, Vol.123 (1), p.78-87 |
| issn | 0304-4203 1872-7581 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_860382848 |
| source | Elsevier ScienceDirect Journals |
| subjects | Arctic Ocean Atmospherics Carbon Decay Dissolution DOC Earth sciences Earth, ocean, space Exact sciences and technology External geophysics Freshwater Geochemistry Marine Mineralogy Physical and chemical properties of sea water Physics of the oceans Radium isotopes Rivers Salinity Shelves Silicates Terrigenous DOC Water geochemistry |
| title | Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-05T15%3A00%3A24IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Rapid%20removal%20of%20terrigenous%20dissolved%20organic%20carbon%20over%20the%20Eurasian%20shelves%20of%20the%20Arctic%20Ocean&rft.jtitle=Marine%20chemistry&rft.au=Letscher,%20Robert%20T.&rft.date=2011-01-20&rft.volume=123&rft.issue=1&rft.spage=78&rft.epage=87&rft.pages=78-87&rft.issn=0304-4203&rft.eissn=1872-7581&rft.coden=MRCHBD&rft_id=info:doi/10.1016/j.marchem.2010.10.002&rft_dat=%3Cproquest_cross%3E1762119398%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1762119398&rft_id=info:pmid/&rft_els_id=S0304420310001052&rfr_iscdi=true |