caa a22 4500 605471479 CHVBK 20210128105155.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00382-014-2460-6 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2460-6 Anomalously wet and dry rainy seasons in Equatorial East Africa and associated differences in intra-seasonal characteristics [Elektronische Daten] [N. Philippon, P. Camberlin, V. Moron, J. Boyard-Micheau] Differences between anomalously wet and dry rainy seasons over the period 1961-2001 in Equatorial East Africa (Kenya, northern Tanzania) are studied at local scale using a 53 rain-gauge network and analysing six intra-seasonal characteristics (ISCs): the onset and end dates, the wet spells number and length, daily mean rainfall amount and the dry spells length. As compared to anomalously dry Long Rains, anomalously wet ones record earlier onsets, more wet spells with higher daily mean rainfall amounts (above 14mm/day). For the Short Rains, the end date is also widely modulated across the rain gauge network, and daily mean rainfall amounts above (below) 10mm/day are more (less) frequent during anomalously wet (dry) seasons. The differences in the number, length and daily mean rainfall amount of wet spells between anomalously wet and anomalously dry rainy seasons is also analysed in an ensemble of 24 sea surface temperature-forced runs of the ECHAM4.5 Atmospheric General Circulation Model. For the Long Rains, results are inconsistent between runs which suggests a lack of reproducibility of the ISCs in the model. For the Short Rains, the ISCs distributions between anomalously wet and anomalously dry years are significantly different in most of the runs/locations. In particular, daily mean rainfall amounts above 8mm/day are more (less) frequent in the model during anomalously wet (dry) years. Springer-Verlag Berlin Heidelberg, 2015 Equatorial East Africa nationallicence Long Rains nationallicence Short Rains nationallicence Intra-seasonal variability nationallicence Wet spells nationallicence ISCs : Intra-seasonal components nationallicence NWS : Number of wet spells nationallicence LWS : Mean length of wet spells nationallicence IWS : Daily mean rainfall amount of wet spells nationallicence LDS : Mean length of dry spells nationallicence OD : Onset date nationallicence ED : End date nationallicence KS test : Kolmogorov-Smirnov test nationallicence Philippon N. Centre de Recherches de Climatologie, UMR Biogéosciences 6282 CNRS, Université de Bourgogne, Dijon, France aut Camberlin P. Centre de Recherches de Climatologie, UMR Biogéosciences 6282 CNRS, Université de Bourgogne, Dijon, France aut Moron V. CEREGE UM 34 CNRS, Aix-Marseille University, Aix en Provence, France aut Boyard-Micheau J. Centre de Recherches de Climatologie, UMR Biogéosciences 6282 CNRS, Université de Bourgogne, Dijon, France aut Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2101-2121 0930-7575 45:7-8<2101 2015 45 382 https://doi.org/10.1007/s00382-014-2460-6 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/s00382-014-2460-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Philippon N. Centre de Recherches de Climatologie, UMR Biogéosciences 6282 CNRS, Université de Bourgogne, Dijon, France aut NATIONALLICENCE 700 1- Camberlin P. Centre de Recherches de Climatologie, UMR Biogéosciences 6282 CNRS, Université de Bourgogne, Dijon, France aut NATIONALLICENCE 700 1- Moron V. CEREGE UM 34 CNRS, Aix-Marseille University, Aix en Provence, France aut NATIONALLICENCE 700 1- Boyard-Micheau J. Centre de Recherches de Climatologie, UMR Biogéosciences 6282 CNRS, Université de Bourgogne, Dijon, France aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2101-2121 0930-7575 45:7-8<2101 2015 45 382 SWISSBIB 60547138X