caa a22 4500 605474192 CHVBK 20210128100346.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00382-014-2120-x doi (NATIONALLICENCE)springer-10.1007/s00382-014-2120-x The relationship between African easterly waves and daily rainfall over West Africa: observations and regional climate simulations [Elektronische Daten] [Julien Crétat, Edward Vizy, Kerry Cook] The relationship between summer African easterly waves (AEWs) and daily rainfall is assessed in West Africa for 1998-2008 using various reanalyses, satellite-derived rainfall products, and a regional climate model (RCM) run at 90- and 30-km resolutions. 3-5 and 6-9day AEWs are extracted by filtering daily 700hPa meridional wind time series at 1°W and 11.5°N, and 1°W and 17.5°N, respectively. Both observed and simulated rainfall anomalies are of larger magnitude over West Africa during 3-5-d than 6-9-d AEWs. The RCM simulates larger rainfall rates in phase with the 3-5-d wave trough instead of ahead, unlike the observations, and overestimates the intensity and spatial coverage of rainfall associated with 6-9-d AEWs. The observed and simulated co-variability between 3-5-d (6-9-d) AEW activity and daily rainfall is strong (weak) and mostly located south (north) of 15°N. However, the RCM overestimates the spatial coverage of the AEW-rainfall relationship in the longitudinal (latitudinal) direction in the case of 3-5-d (6-9-d) AEWs. Observed and simulated daily intense rainfall events, extracted using a percentile threshold approach, are mostly located south of 15°N during summer. The observed relationship between their frequency of occurrence and active 3-5-d AEWs is maximal west of 8°E, while extends up to southern Chad in both RCM simulations. Their magnitude is also largely overestimated by the RCM, indicating an exaggerated coupling between the wave activity and the convection. Finally, observed and simulated 3-5-d AEWs establish the most favorable synoptic conditions for the development of intense rainfall events over West Africa. Springer-Verlag Berlin Heidelberg, 2014 African easterly waves nationallicence Daily intense/extreme rainfall events nationallicence Regional climate model nationallicence Sahel nationallicence West Africa nationallicence Crétat Julien Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, 78712, Austin, TX, USA aut Vizy Edward Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, 78712, Austin, TX, USA aut Cook Kerry Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, 78712, Austin, TX, USA aut Climate Dynamics Springer Berlin Heidelberg 44/1-2(2015-01-01), 385-404 0930-7575 44:1-2<385 2015 44 382 https://doi.org/10.1007/s00382-014-2120-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2120-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Crétat Julien Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, 78712, Austin, TX, USA aut NATIONALLICENCE 700 1- Vizy Edward Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, 78712, Austin, TX, USA aut NATIONALLICENCE 700 1- Cook Kerry Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, 78712, Austin, TX, USA aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 44/1-2(2015-01-01), 385-404 0930-7575 44:1-2<385 2015 44 382