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Two Modes of Change in Southern Ocean Productivity Over the Past Million Years.

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Title: Two Modes of Change in Southern Ocean Productivity Over the Past Million Years.
Authors: Jaccard, S. L., Hayes, C. T., Martínez-García, A., Hodell, D. A., Anderson, R. F., Sigman, D. M., Haug, G. H.
Source: Science (pre-March 2025). 3/22/2013, Vol. 339 Issue 6126, p1419-1423. 5p.
Subjects: Marine productivity, Ocean-atmosphere interaction, Atmospheric carbon dioxide & the environment, Seawater fertilization, Iron content of seawater, Marine phytoplankton, Paleoceanography, Paleoclimatology
Geographic Terms: Antarctic Ocean, Subantarctic region
Abstract: Export of organic carbon from surface waters of the Antarctic Zone of the Southern Ocean decreased during the last ice age, coinciding with declining atmospheric carbon dioxide (CO2) concentrations, signaling reduced exchange of CO2 between the ocean interior and the atmosphere. In contrast, in the Subantarctic Zone, export production increased into ice ages coinciding with rising dust fluxes, thus suggesting iron fertilization of subantarctic phytoplankton. Here, a new high-resolution productivity record from the Antarctic Zone is compiled with parallel subantarctic data over the past million years. Together, they fit the view that the combination of these two modes of Southern Ocean change determines the temporal structure of the glacial-interglacial atmospheric CO2 record, including during the interval of "lukewarm" interglacials between 450 and 800 thousand years ago. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 3/22/2013, Vol. 339 Issue 6126, p1419-1423. 5p.
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  Data: Export of organic carbon from surface waters of the Antarctic Zone of the Southern Ocean decreased during the last ice age, coinciding with declining atmospheric carbon dioxide (CO2) concentrations, signaling reduced exchange of CO2 between the ocean interior and the atmosphere. In contrast, in the Subantarctic Zone, export production increased into ice ages coinciding with rising dust fluxes, thus suggesting iron fertilization of subantarctic phytoplankton. Here, a new high-resolution productivity record from the Antarctic Zone is compiled with parallel subantarctic data over the past million years. Together, they fit the view that the combination of these two modes of Southern Ocean change determines the temporal structure of the glacial-interglacial atmospheric CO2 record, including during the interval of "lukewarm" interglacials between 450 and 800 thousand years ago. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=86688224
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        Value: 10.1126/science.1227545
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        Text: English
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      – SubjectFull: Marine productivity
        Type: general
      – SubjectFull: Ocean-atmosphere interaction
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      – SubjectFull: Atmospheric carbon dioxide & the environment
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      – SubjectFull: Seawater fertilization
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      – SubjectFull: Iron content of seawater
        Type: general
      – SubjectFull: Marine phytoplankton
        Type: general
      – SubjectFull: Paleoceanography
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      – SubjectFull: Paleoclimatology
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      – SubjectFull: Antarctic Ocean
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      – SubjectFull: Subantarctic region
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      – TitleFull: Two Modes of Change in Southern Ocean Productivity Over the Past Million Years.
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              Text: 3/22/2013
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              Y: 2013
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