Preface -- Chapter 1: Motivation -- Chapter 2: State-of-the-Art -- Chapter 3: Objectives -- Chapter 4: Physical Background -- Chapter 5: Data -- Chapter 6: Methodology -- Chapter 7: A Statistical Model based on Non-stationary Predictors -- Chapter 8: Interdecadal changes in the SST-driven teleconnections with the Sahel -- Chapter 9: Modulation of the non-stationary Mediterranean-Sahel teleconne…