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          Institute: MPI für Meteorologie     Collection: Climate Processes     Display Documents

ID: 255817.0, MPI für Meteorologie / Climate Processes
Enhanced albedo feedback in North Africa from possible combined vegetation and soil-formation processes
Authors:Knorr, Wolfgang; Schnitzler, Karl-Georg
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Climate Dynamics
Start Page:55
End Page:63
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:It has long been recognized that albedo related vegetation feedbacks amplify climate variability in North Africa. Recent studies have revealed that areas of very high albedo associated with certain desert soil types contribute to the current dry climate of the region. We construct three scenarios of North African albedo, one based on satellite measurements, one where the highest albedo resembles that of soils in the desert transition zones, and one based on a vegetation map for the “green Sahara” state of the middle Holocene, ca. 6,000 years ago. Using a series of climate model simulations, we find that the additional amplitude of albedo change from the middle Holocene to the present caused by the very bright desert soils enhances the magnitude of the June-to-August precipitation change in the region of the present Sahara from 0.6 to 1.0 mm/day on average. We also find that albedo change has a larger effect on regional precipitation than changes in either the Earth’s orbit or sea surface temperatures between 6,000 years ago and today. Simulated precipitation agrees rather well with present observations and mid Holocene reconstructions. Our results suggest that there may exist an important climate feedback from soil formation processes that has so far not been recognized.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Meteorologie/Land in the Earth System (2005-)
External Affiliations:Department of Earth Sciences, University of Bristol, UK
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