Fig. 1
From: Rapid termination of the African Humid Period triggered by northern high-latitude cooling
Maps of the study area and climatology. a Colours represent mean monthly precipitation (mm) for the months Jun to Oct, the primary wet seasons for southern Cameroon and the Sahel. Red star marks the study site GeoB4905-4 (2°30.0´ N, 09°23.4´ E) in the Gulf of Guinea. Red dot marks the Gulf of Aden P178-15P core site4, white dots mark other sites discussed in the text and blue dots mark SST records from Supplementary Table 1. Black arrows mark position of TEJ and AEJ in summer13. Black box marks the inset. b Zoomed-in map of the study region showing C3–C4 vegetation distribution, rivers and bathymetry. Yellow dots mark the Douala, N’djamena, Niamey and Bangui GNIP stations, and Lake Ossa. Bathymetry shallower than 120 m is coloured in grey. c Monthly precipitation amount and δDp data for N’djamena, Chad and Doula, Cameroon27, highlighting the large seasonal δDp changes in the Sahel compared to equatorial regions. Error bars represent standard deviation (1σ) of monthly measurements
