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Rapid 20th Century increase in coastal upwelling off northwest Africa

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: McGregor, H. V., M. Dima, H.W. Fischer, S. Mulitza

Editorial: Science, 315, p.637-639, 2007.


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 20th century cooling, consistent with increased upwelling. SSTs also show a relatively warm Little Ice Age and cool Medieval Warm Period. Furthermore, upwelling-driven SSTs vary out of phase with millennial-scale changes in Northern Hemisphere temperatures (NHTs). Together, these results suggest that coastal upwelling varies with NHTs, and that upwelling off northwest Africa may continue to intensify as atmospheric CO2 levels increase.

Cuvinte cheie: coastal upwelling, millennial variability, northern hemisphere