The distribution and speciation of mercury in the South and equatorial Atlantic
Mercury concentration and speciation were measured in surface and deep ocean waters of the South and equatorial Atlantic. In the surface waters, total Hg was 2.9±1.7 pM on average, with a significant fraction present as reactive Hg (1.7±1.2 pM). The reactive Hg fraction consisted of elemental Hg (Hg...
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| Veröffentlicht in: | Deep-sea research. Part II, Topical studies in oceanography Topical studies in oceanography, 1999-01, Vol.46 (5), p.937-956 |
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| container_title | Deep-sea research. Part II, Topical studies in oceanography |
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| creator | Mason, R.P Sullivan, K.A |
| description | Mercury concentration and speciation were measured in surface and deep ocean waters of the South and equatorial Atlantic. In the surface waters, total Hg was 2.9±1.7
pM on average, with a significant fraction present as reactive Hg (1.7±1.2
pM). The reactive Hg fraction consisted of elemental Hg (Hg°) as the dominant species (1.2±0.8
pM). Measurements in surface waters also showed that Hg partitioned to the “colloidal” phase (0.33±0.28
pM) and was associated with particulate matter (0.1±0.05
pM). No dimethylmercury (DMHg; |
| doi_str_mv | 10.1016/S0967-0645(99)00010-7 |
| format | Article |
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pM on average, with a significant fraction present as reactive Hg (1.7±1.2
pM). The reactive Hg fraction consisted of elemental Hg (Hg°) as the dominant species (1.2±0.8
pM). Measurements in surface waters also showed that Hg partitioned to the “colloidal” phase (0.33±0.28
pM) and was associated with particulate matter (0.1±0.05
pM). No dimethylmercury (DMHg;<0.01
pM) or monomethylmercury (MMHg; <0.05
pM) was detected in mixed layer samples. The highest DMHg concentrations were found in recently formed deep waters – Antarctic Intermediate Water and Antarctic Bottom Water and in the equatorial sub-thermocline region. Higher concentrations of DMHg coincided with higher values of apparent oxygen utilization, indicative of a link between microbial activity and methylated Hg production. The lowest-deep water DMHg concentrations were found in the core of the North Atlantic Deep Water. Incubation experiments on-board demonstrated that light enhanced the decomposition of DMHg, with MMHg as the major product. In deep waters, Hg° was still an important constituent and is likely formed as a decomposition product from MMHg. These results suggest that methylated Hg production occurs primarily in regions of high biological activity, and that ionic Hg is strongly complexed to organic matter (colloidal material) in open ocean surface waters.</description><identifier>ISSN: 0967-0645</identifier><identifier>EISSN: 1879-0100</identifier><identifier>DOI: 10.1016/S0967-0645(99)00010-7</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Atlantic Ocean ; Marine</subject><ispartof>Deep-sea research. Part II, Topical studies in oceanography, 1999-01, Vol.46 (5), p.937-956</ispartof><rights>1999 Elsevier Science Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a458t-26c2be8e53883422c9a22e45075878758bd21c2372079491f42a7fd2a173a92e3</citedby><cites>FETCH-LOGICAL-a458t-26c2be8e53883422c9a22e45075878758bd21c2372079491f42a7fd2a173a92e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0967-0645(99)00010-7$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Mason, R.P</creatorcontrib><creatorcontrib>Sullivan, K.A</creatorcontrib><title>The distribution and speciation of mercury in the South and equatorial Atlantic</title><title>Deep-sea research. Part II, Topical studies in oceanography</title><description>Mercury concentration and speciation were measured in surface and deep ocean waters of the South and equatorial Atlantic. In the surface waters, total Hg was 2.9±1.7
pM on average, with a significant fraction present as reactive Hg (1.7±1.2
pM). The reactive Hg fraction consisted of elemental Hg (Hg°) as the dominant species (1.2±0.8
pM). Measurements in surface waters also showed that Hg partitioned to the “colloidal” phase (0.33±0.28
pM) and was associated with particulate matter (0.1±0.05
pM). No dimethylmercury (DMHg;<0.01
pM) or monomethylmercury (MMHg; <0.05
pM) was detected in mixed layer samples. The highest DMHg concentrations were found in recently formed deep waters – Antarctic Intermediate Water and Antarctic Bottom Water and in the equatorial sub-thermocline region. Higher concentrations of DMHg coincided with higher values of apparent oxygen utilization, indicative of a link between microbial activity and methylated Hg production. The lowest-deep water DMHg concentrations were found in the core of the North Atlantic Deep Water. Incubation experiments on-board demonstrated that light enhanced the decomposition of DMHg, with MMHg as the major product. In deep waters, Hg° was still an important constituent and is likely formed as a decomposition product from MMHg. These results suggest that methylated Hg production occurs primarily in regions of high biological activity, and that ionic Hg is strongly complexed to organic matter (colloidal material) in open ocean surface waters.</description><subject>Atlantic Ocean</subject><subject>Marine</subject><issn>0967-0645</issn><issn>1879-0100</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqFkEtLAzEUhYMoWKs_QZiV6GI0j5lJspJS6gMKXbSuQ5q5QyPTSZtkhP5706m47eZeLnzncM9B6J7gZ4JJ9bLEsuI5roryUconjDHBOb9AIyK4zNOBL9HoH7lGNyF8J4ixSo7QYrWBrLYhervuo3Vdprs6CzswVg-na7IteNP7Q2a7LCZ66fq4GTDY9zo6b3WbTWKru2jNLbpqdBvg7m-P0dfbbDX9yOeL98_pZJ7rohQxp5WhaxBQMiFYQamRmlIoSsxLwUUa65oSQxmnmMtCkqagmjc11YQzLSmwMXo4-e682_cQotraYKBNX4DrgyIiJSaCnAc5qzgjNIHlCTTeheChUTtvt9ofFMHq2LMaelbHEpWUauhZ8aR7Pekgxf2x4FUwFjoDtfVgoqqdPePwC5Lug6A</recordid><startdate>19990101</startdate><enddate>19990101</enddate><creator>Mason, R.P</creator><creator>Sullivan, K.A</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>7TV</scope><scope>C1K</scope><scope>F1W</scope><scope>H97</scope><scope>L.G</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>19990101</creationdate><title>The distribution and speciation of mercury in the South and equatorial Atlantic</title><author>Mason, R.P ; Sullivan, K.A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a458t-26c2be8e53883422c9a22e45075878758bd21c2372079491f42a7fd2a173a92e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Atlantic Ocean</topic><topic>Marine</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mason, R.P</creatorcontrib><creatorcontrib>Sullivan, K.A</creatorcontrib><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>Pollution Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 3: Aquatic Pollution & Environmental Quality</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Deep-sea research. Part II, Topical studies in oceanography</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mason, R.P</au><au>Sullivan, K.A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The distribution and speciation of mercury in the South and equatorial Atlantic</atitle><jtitle>Deep-sea research. Part II, Topical studies in oceanography</jtitle><date>1999-01-01</date><risdate>1999</risdate><volume>46</volume><issue>5</issue><spage>937</spage><epage>956</epage><pages>937-956</pages><issn>0967-0645</issn><eissn>1879-0100</eissn><abstract>Mercury concentration and speciation were measured in surface and deep ocean waters of the South and equatorial Atlantic. In the surface waters, total Hg was 2.9±1.7
pM on average, with a significant fraction present as reactive Hg (1.7±1.2
pM). The reactive Hg fraction consisted of elemental Hg (Hg°) as the dominant species (1.2±0.8
pM). Measurements in surface waters also showed that Hg partitioned to the “colloidal” phase (0.33±0.28
pM) and was associated with particulate matter (0.1±0.05
pM). No dimethylmercury (DMHg;<0.01
pM) or monomethylmercury (MMHg; <0.05
pM) was detected in mixed layer samples. The highest DMHg concentrations were found in recently formed deep waters – Antarctic Intermediate Water and Antarctic Bottom Water and in the equatorial sub-thermocline region. Higher concentrations of DMHg coincided with higher values of apparent oxygen utilization, indicative of a link between microbial activity and methylated Hg production. The lowest-deep water DMHg concentrations were found in the core of the North Atlantic Deep Water. Incubation experiments on-board demonstrated that light enhanced the decomposition of DMHg, with MMHg as the major product. In deep waters, Hg° was still an important constituent and is likely formed as a decomposition product from MMHg. These results suggest that methylated Hg production occurs primarily in regions of high biological activity, and that ionic Hg is strongly complexed to organic matter (colloidal material) in open ocean surface waters.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/S0967-0645(99)00010-7</doi><tpages>20</tpages></addata></record> |
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| ispartof | Deep-sea research. Part II, Topical studies in oceanography, 1999-01, Vol.46 (5), p.937-956 |
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| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Atlantic Ocean Marine |
| title | The distribution and speciation of mercury in the South and equatorial Atlantic |
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