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The impact of Sahara desertification on Arctic cooling during the Holocene
Stockholm University, Faculty of Science, Department of Geological Sciences.
2015 (English)In: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 11, 571-586 p.Article in journal (Refereed) Published
Abstract [en]

Since the start of the Holocene, temperatures in the Arctic have steadily declined. This has been accredited to the orbitally forced decrease in summer insolation reconstructed over the same period. However, here we present climate modelling results from an Earth model of intermediate complexity (EMIC) that indicate that 17–40% of the cooling in the Arctic, over the period 9–0 ka, was a direct result of the desertification that occurred in the Sahara after the termination of the African Humid Period. We have performed a suite of sensitivity experiments to analyse the impact of different combinations of forcings, including various vegetation covers in the Sahara. Our simulations suggest that over the course of the Holocene, a strong increase in surface albedo in the Sahara as a result of desertification led to a regional increase in surface pressure, a weakening of the trade winds, the westerlies and the polar easterlies, which in turn reduced the meridional heat transported by the atmosphere to the Arctic. We conclude that during interglacials, the climate of the Northern Hemisphere is sensitive to changes in Sahara vegetation type.

Place, publisher, year, edition, pages
2015. Vol. 11, 571-586 p.
National Category
Climate Research Meteorology and Atmospheric Sciences
Research subject
Atmospheric Sciences and Oceanography
Identifiers
URN: urn:nbn:se:su:diva-116265DOI: 10.5194/cp-11-571-2015OAI: oai:DiVA.org:su-116265DiVA: diva2:805880
Available from: 2015-04-16 Created: 2015-04-16 Last updated: 2016-10-27Bibliographically approved

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Muschitiello, Francesco
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