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Analysis of Rainfall Dynamics in Conakry, Republic of Guinea

Observed rainfall data of the National Meteorological Service of Guinea (NMS) exhibit that synoptic station usually records the largest rainfall amount in Guinea. Only few studies have been done on this rainfall peak observed in Conakry. This work better analyses the atmospheric dynamics leading to rainfall particularity. Using NMS data from 1981 to 2010, the monthly con- tribution and mean seasonal cycle of each station has been done. These find- ings of the study show that between July and August (rainfall season peak), the coastline particularly Conakry records the largest amount of rainfall. Us- ing Era Interim data for the common period (1981-2010), we also investigate the rainfall dynamics in the lower level (1000 hPa - 850 hPa) from precipit- able water, divergence, and moisture flow transport. There is a west and southwest moisture flow transport explained by a strong moisture conver- gence in the coastal region (Lower-Guinea). Furthermore, values of precipit- able water in the same region are found, in agreement with the high moisture flow transport gradient. These incoming flow (west and south-west) undergo a return by blocking’s Kakoulima range (foehn effect) and Fouta Djallon massif to initiate convection clouds on the Guinean coast. These processes enhance a convergence of moisture associated with orographic origin convec- tion. This has an important effect by increasing the rainfall amount in Cona- kry.

Auteur(s) : Ibrahima Kalil Kante1, Saïdou Moustapha Sall, Daouda Badiane, Ibrahima Diouf, Abdoul Lahat Dieng, Idrissa Diaby, Françoise Guichard
Année de publication : 2019
Revue : Atmospheric and Climate Sciences
Type : Article
Mise en ligne par : SALL Saïdou Moustapha