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| Titel |
Rapid reorganization in ocean biogeochemistry off Peru towards the end of the Little Ice Age |
| VerfasserIn |
D. Gutiérrez, A. Sifeddine, D. B. Field, L. Ortlieb, G. Vargas, F. P. Chávez, F. Velazco, V. Ferreira, P. Tapia, R. Salvatteci, H. Boucher, M. C. Morales, J. Valdés, J.-L. Reyss, A. Campusano, M. Boussafir, M. Mandeng-Yogo, M. García, T. Baumgartner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 5 ; Nr. 6, no. 5 (2009-05-15), S.835-848 |
| Datensatznummer |
250003746
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| Publikation (Nr.) |
 copernicus.org/bg-6-835-2009.pdf |
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| Zusammenfassung |
| Climate and ocean ecosystem variability has been well recognized during the
twentieth century but it is unclear if modern ocean biogeochemistry is
susceptible to the large, abrupt shifts that characterized the Late
Quaternary. Time series from marine sediments off Peru show an abrupt
centennial-scale biogeochemical regime shift in the early nineteenth
century, of much greater magnitude and duration than present day
multi-decadal variability. A rapid expansion of the subsurface
nutrient-rich, oxygen-depleted waters resulted in the present-day higher
biological productivity, including pelagic fish. The shift was likely driven
by a northward migration of the Intertropical Convergence Zone and the South
Pacific Subtropical High to their present day locations, coupled with a
strengthening of Walker circulation, towards the end of the Little Ice Age.
These findings reveal the potential for large reorganizations in tropical
Pacific climate with immediate effects on ocean biogeochemical cycling and
ecosystem structure. |
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