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Rapid 20th-century increase in coastal upwelling off northwest Africa

Journal Article


Abstract


  • Near-shore waters along the northwest African margin are characterized by coastal upwelling and represent one of the world's major upwelling regions. Sea surface temperature (SST) records from Moroccan sediment cores, extending back 2500 years, reveal anomalous and unprecedented cooling during the 20th century, which is consistent with increased upwelling. Upwelling-driven SSTs also vary out of phase with millennial-scale changes in Northern Hemisphere temperature anomalies (NHTAs) and show relatively warm conditions during the Little Ice Age and relatively cool conditions during the Medieval Warm Period. Together, these results suggest that coastal upwelling varies with NHTAs and that upwelling off northwest Africa may continue to intensify as global warming and atmospheric CO2 levels increase.

Authors


  •   McGregor, Helen V.
  •   Dima, M (external author)
  •   Fischer, H W. (external author)
  •   Mulitza, S (external author)

Publication Date


  • 2007

Citation


  • McGregor, H. V., Dima, M., Fischer, H. W. & Mulitza, S. (2007). Rapid 20th-century increase in coastal upwelling off northwest Africa. Science, 315 (5812), 637-639.

Scopus Eid


  • 2-s2.0-33846849445

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/1077

Number Of Pages


  • 2

Start Page


  • 637

End Page


  • 639

Volume


  • 315

Issue


  • 5812

Place Of Publication


  • http://sciencemag.org

Abstract


  • Near-shore waters along the northwest African margin are characterized by coastal upwelling and represent one of the world's major upwelling regions. Sea surface temperature (SST) records from Moroccan sediment cores, extending back 2500 years, reveal anomalous and unprecedented cooling during the 20th century, which is consistent with increased upwelling. Upwelling-driven SSTs also vary out of phase with millennial-scale changes in Northern Hemisphere temperature anomalies (NHTAs) and show relatively warm conditions during the Little Ice Age and relatively cool conditions during the Medieval Warm Period. Together, these results suggest that coastal upwelling varies with NHTAs and that upwelling off northwest Africa may continue to intensify as global warming and atmospheric CO2 levels increase.

Authors


  •   McGregor, Helen V.
  •   Dima, M (external author)
  •   Fischer, H W. (external author)
  •   Mulitza, S (external author)

Publication Date


  • 2007

Citation


  • McGregor, H. V., Dima, M., Fischer, H. W. & Mulitza, S. (2007). Rapid 20th-century increase in coastal upwelling off northwest Africa. Science, 315 (5812), 637-639.

Scopus Eid


  • 2-s2.0-33846849445

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/1077

Number Of Pages


  • 2

Start Page


  • 637

End Page


  • 639

Volume


  • 315

Issue


  • 5812

Place Of Publication


  • http://sciencemag.org