The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, supplementary datasets
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2015
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| _version_ | 1867170469174575104 |
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| author | Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf |
| author_facet | Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_854121 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, supplementary datasets Abelmann, Andrea Gersonde, Rainer Knorr, Gregor Zhang, Xu Chapligin, Bernhard Maier, Edith Esper, Oliver Friedrichsen, Hans Lohmann, Gerrit Meyer, Hanno Tiedemann, Ralf AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI Reduced surface-deep ocean exchange and enhanced nutrient consumption by phytoplankton in the Southern Ocean have been linked to lower glacial atmospheric CO2. However, identification of the biological and physical conditions involved and the related processes remains incomplete. Here we specify Southern Ocean surface-subsurface contrasts using a new tool, the combined oxygen and silicon isotope measurement of diatom and radiolarian opal, in combination with numerical simulations. Our data do not indicate a permanent glacial halocline related to melt water from icebergs. Corroborated by numerical simulations, we find that glacial surface stratification was variable and linked to seasonal sea-ice changes. During glacial spring-summer, the mixed layer was relatively shallow, while deeper mixing occurred during fall-winter, allowing for surface-ocean refueling with nutrients from the deep reservoir, which was potentially richer in nutrients than today. This generated specific carbon and opal export regimes turning the glacial seasonal sea-ice zone into a carbon sink. |
| title | The seasonal sea-ice zone in the glacial Southern Ocean as a carbon sink, supplementary datasets |
| topic | AWI_Paleo; Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
| url | https://doi.org/10.1594/PANGAEA.854121 |