Biogenic halocarbons from the Peruvian upwelling region during METEOR cruise M91
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2016
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| _version_ | 1867170470245171200 |
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| author | Hepach, Helmke Quack, Birgit Tegtmeier, Susann Engel, Anja Bracher, Astrid Fuhlbrügge, Steffen Galgani, Luisa Atlas, Elliot L Lampel, Johannes Frieß, Udo Krüger, Kirstin |
| author_facet | Hepach, Helmke Quack, Birgit Tegtmeier, Susann Engel, Anja Bracher, Astrid Fuhlbrügge, Steffen Galgani, Luisa Atlas, Elliot L Lampel, Johannes Frieß, Udo Krüger, Kirstin |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Halocarbons, halogenated short-chained hydrocarbons, are produced naturally in the oceans by biological and chemical processes. They are emitted from surface seawater into the atmosphere, where they take part in numerous chemical processes such as ozone destruction and the oxidation of mercury and dimethyl sulfide. Here we present oceanic and atmospheric halocarbon data for the Peruvian upwelling obtained during the M91 cruise onboard the research vessel Meteor in December 2012. Surface waters during the cruise were characterized by moderate concentrations of bromoform (CHBr3) and dibromomethane (CH2Br2) correlating with diatom biomass derived from marker pigment concentrations, which suggests this phytoplankton group as likely source. Concentrations measured for the iodinated compounds methyl iodide (CH3I) of up to 35.4 pmol L-1, chloroiodomethane (CH2ClI) of up to 58.1 pmol L-1 and diiodomethane (CH2I2) of up to 32.4 pmol L-1 in water samples were much higher than previously reported for the tropical Atlantic upwelling systems. Iodocarbons also correlated with the diatom biomass and even more significantly with dissolved organic matter (DOM) components measured in the surface water. Our results suggest a biological source of these compounds as significant driving factor for the observed large iodocarbon concentrations. Elevated atmospheric mixing ratios of CH3I (up to 3.2 ppt), CH2ClI (up to 2.5 ppt) and CH2I2 (3.3 ppt) above the upwelling were correlated with seawater concentrations and high sea-to-air fluxes. The enhanced iodocarbon production in the Peruvian upwelling contributed significantly to tropospheric iodine levels. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_864787 |
| institution | PANGAEA |
| language | en |
| publishDate | 2016 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Biogenic halocarbons from the Peruvian upwelling region during METEOR cruise M91 Hepach, Helmke Quack, Birgit Tegtmeier, Susann Engel, Anja Bracher, Astrid Fuhlbrügge, Steffen Galgani, Luisa Atlas, Elliot L Lampel, Johannes Frieß, Udo Krüger, Kirstin SOPRAN; Surface Ocean Processes in the Anthropocene Halocarbons, halogenated short-chained hydrocarbons, are produced naturally in the oceans by biological and chemical processes. They are emitted from surface seawater into the atmosphere, where they take part in numerous chemical processes such as ozone destruction and the oxidation of mercury and dimethyl sulfide. Here we present oceanic and atmospheric halocarbon data for the Peruvian upwelling obtained during the M91 cruise onboard the research vessel Meteor in December 2012. Surface waters during the cruise were characterized by moderate concentrations of bromoform (CHBr3) and dibromomethane (CH2Br2) correlating with diatom biomass derived from marker pigment concentrations, which suggests this phytoplankton group as likely source. Concentrations measured for the iodinated compounds methyl iodide (CH3I) of up to 35.4 pmol L-1, chloroiodomethane (CH2ClI) of up to 58.1 pmol L-1 and diiodomethane (CH2I2) of up to 32.4 pmol L-1 in water samples were much higher than previously reported for the tropical Atlantic upwelling systems. Iodocarbons also correlated with the diatom biomass and even more significantly with dissolved organic matter (DOM) components measured in the surface water. Our results suggest a biological source of these compounds as significant driving factor for the observed large iodocarbon concentrations. Elevated atmospheric mixing ratios of CH3I (up to 3.2 ppt), CH2ClI (up to 2.5 ppt) and CH2I2 (3.3 ppt) above the upwelling were correlated with seawater concentrations and high sea-to-air fluxes. The enhanced iodocarbon production in the Peruvian upwelling contributed significantly to tropospheric iodine levels. |
| title | Biogenic halocarbons from the Peruvian upwelling region during METEOR cruise M91 |
| topic | SOPRAN; Surface Ocean Processes in the Anthropocene |
| url | https://doi.org/10.1594/PANGAEA.864787 |