Intra-seasonal modulation of convection in the West African monsoon
| dc.creator | Janicot, Serge | |
| dc.date.accessioned | 2025-08-30T04:06:14Z | |
| dc.date.issued | 2001 | |
| dc.description.abstract | By using daily gridded rainfall data and NCEP/NCAR 925 hPa wind reanalyses over the period 1968-1990, it is shown the evidence of large and coherent fluctuations in the rainfall and wind fields at intra-seasonal time scale (10-60-day period) over West Africa. A composite analysis based on the dates of maximum (minimum) of a regional rainfall index in wet (dry) sequences shows that these sequences belong to a quasi-periodic signal of about 15 days. These enhanced (weakened) phases in the West African monsoon are characterized by a westward propagation of positive (negative) rainfall anomalies north of 10øN associated with a more cyclonic (anticyclonic) circulation over the Sahel consistent with a stronger (weaker) moisture advection over West Africa. | |
| dc.identifier.other | hal-00162234 | |
| dc.identifier.uri | https://hal.science/hal-00162234 | |
| dc.identifier.uri | https://africarxiv.ubuntunet.net/handle/1/9592 | |
| dc.language.iso | en | |
| dc.subject | African Research | |
| dc.title | Intra-seasonal modulation of convection in the West African monsoon | |
| dc.type | Academic Publication |