Moss Landing Marine Laboratories
Abstract. Several explanations for the 200 to 280 ppm glacial/interglacial change in atmospheric CO 2 concentrations deal with variations in southern ocean phyto-plankton productivity and the related use or nonuse of major plant nutrients. An hypothesis is presented herein in which arguments are mad...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.409.4904 2023-05-15T18:24:38+02:00 Moss Landing Marine Laboratories John H. Martin The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.4904 http://instaar.colorado.edu/~marchitt//martin90.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.4904 http://instaar.colorado.edu/~marchitt//martin90.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://instaar.colorado.edu/~marchitt//martin90.pdf text ftciteseerx 2016-01-08T03:13:05Z Abstract. Several explanations for the 200 to 280 ppm glacial/interglacial change in atmospheric CO 2 concentrations deal with variations in southern ocean phyto-plankton productivity and the related use or nonuse of major plant nutrients. An hypothesis is presented herein in which arguments are made that new productivity in today's southern ocean (7.4 X 1013 g yr-1) is limited by iron deficiency, and hence the phytoplankton are unable to take advantage of the excess surface nitrate/ phosphate that, if used, could result in total southern ocean new production of 2-3 X 1015 g C yr-1. As a consequence of Fe-limited new productivity, Holocene interglacial CO 2 levels (preindustrial) are as high as they were during the last interglacial ( • 280 ppm). In contrast, atmospheric dust Fe supplies were 50 times higher during the last glacial maximum (LGM). Because of this Fe enrichment, phytoplankton growth may have been greatly enhanced, larger amounts of upwelled nutrients may have been used, and the resulting stimulation of new productivity may have contributed to the LGM drawdown of atmospheric CO 2 to levels of less than Text Southern Ocean Unknown Southern Ocean |
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Abstract. Several explanations for the 200 to 280 ppm glacial/interglacial change in atmospheric CO 2 concentrations deal with variations in southern ocean phyto-plankton productivity and the related use or nonuse of major plant nutrients. An hypothesis is presented herein in which arguments are made that new productivity in today's southern ocean (7.4 X 1013 g yr-1) is limited by iron deficiency, and hence the phytoplankton are unable to take advantage of the excess surface nitrate/ phosphate that, if used, could result in total southern ocean new production of 2-3 X 1015 g C yr-1. As a consequence of Fe-limited new productivity, Holocene interglacial CO 2 levels (preindustrial) are as high as they were during the last interglacial ( • 280 ppm). In contrast, atmospheric dust Fe supplies were 50 times higher during the last glacial maximum (LGM). Because of this Fe enrichment, phytoplankton growth may have been greatly enhanced, larger amounts of upwelled nutrients may have been used, and the resulting stimulation of new productivity may have contributed to the LGM drawdown of atmospheric CO 2 to levels of less than |
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The Pennsylvania State University CiteSeerX Archives |
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Text |
author |
John H. Martin |
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John H. Martin Moss Landing Marine Laboratories |
author_facet |
John H. Martin |
author_sort |
John H. Martin |
title |
Moss Landing Marine Laboratories |
title_short |
Moss Landing Marine Laboratories |
title_full |
Moss Landing Marine Laboratories |
title_fullStr |
Moss Landing Marine Laboratories |
title_full_unstemmed |
Moss Landing Marine Laboratories |
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moss landing marine laboratories |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.4904 http://instaar.colorado.edu/~marchitt//martin90.pdf |
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Southern Ocean |
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Southern Ocean |
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Southern Ocean |
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Southern Ocean |
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http://instaar.colorado.edu/~marchitt//martin90.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.409.4904 http://instaar.colorado.edu/~marchitt//martin90.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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