Figure 1

Time series of JAS Sahel rainfall, JJA SAWPSM precipitation and JJA SAWPSM cloudiness. Time series of (a) JAS rainfall over the Sahel in the PRECL precipitation data, (b) JJA SAWPSM precipitation in the NCEP Reanalysis data, (c) JJA SAWPSM precipitation in the ERA-40, and (d) JJA SAWPSM cloudiness (bar), and the weighted running average with 9-year Lanczos low-pass filter of the time series (solid line; see Methods). This figure was generated by the NCAR Command Language (Version 6.3.0) [Software]. (2016). Boulder, Colorado: UCAR/NCAR/CISL/TDD. http://dx.doi.org/10.5065/D6WD3XH5.