Simulated range of mid-Holocene precipitation changes from extended lakes and wetlands over North Africa

Abstract ∘ farther north in simulations with a maximum lake or wetland extent than in simulations with a small lake extent. This northward extent is caused by a stronger and prolonged monsoon rainfall season over North Africa which is associated with an increased monsoon precipitation over the southern Sahara and an increased precipitation from tropical plumes over the northwestern Sahara. Replacing lakes with vegetated wetlands causes an enhanced precipitation increase, which is likely due to the high surface roughness of the wetlands. A moisture budget analysis reveals that both lakes and wetlands cause a local precipitation increase not only by enhanced evaporation but also by a stronger inland moisture transport and local moisture recycling to the south of Lake Chad and the west Saharan lakes. Analysis of the dynamic response shows that lakes and wetlands cause a circulation response inverse to the one associated with the Saharan heat low. Depending on the latitudinal position of the lakes and wetlands, they predominantly cause a northward shift or a decay of the African Easterly Jet. These results indicate that the latitudinal position of the lakes and wetlands strongly affects the northward extension of the African summer monsoon.

Angaben zum Objekt

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Simulated range of mid-Holocene precipitation changes from extended lakes and wetlands over North Africa ; volume:18 ; number:5 ; year:2022 ; pages:1035-1046 ; extent:12 ; Climate of the past ; 18, Heft 5 (2022), 1035-1046 (gesamt 12)

Beteiligte, Orts- und Zeitangaben

• Urheber: Specht, Nora Farina ; Claussen, Martin ; Kleinen, Thomas

Weitere Informationen

• DOI: 10.5194/cp-18-1035-2022
• URN: urn:nbn:de:101:1-2022051905393207439945
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Letzte Aktualisierung: 15.08.2025, 07:23 MESZ