@article{fdi:010052092, title = {{O}n the northward shift of the {W}est {A}frican monsoon}, author = {{R}amel, {R}. and {G}allee, {H}. and {M}essager, {C}.}, editor = {}, language = {{ENG}}, abstract = {{T}he regional climate model ({MAR}) is used to perform a simulation of the year 1992 over {W}est {A}frica. {I}t is shown that {MAR} is able to simulate the main features of the rainy regime over {W}est {A}frica and especially the discontinuous seasonal progression of the {W}est {A}frican {M}onsoon along the year. {O}ne particular feature that is reasonably well reproduced is the abrupt shift of the rain band from 5 degrees to 10 degrees {N} at the end of {J}une (also called "monsoon jump"). {T}his study suggests that such a phenomenon is associated with the shift of the {S}aharan heat low between two favourite positions: one being over the {S}ahelian area (10-15 degrees {N}) and the other over the {S}aharan area (20-25 degrees {N}). {T}hese two favourite locations of the heat low are linked to the spatial distribution of surface albedo over {W}est {A}frica that drives the spatio-temporal location of the surface temperature maxima. {A} detailed analysis of this "monsoon jump" is performed and the causes of the strong decrease in precipitation that precedes the northward shift of the rain band are also investigated.}, keywords = {}, booktitle = {}, journal = {{C}limate {D}ynamics}, volume = {26}, numero = {4}, pages = {429--440}, year = {2006}, DOI = {10.1007/s00382-005-0093-5}, URL = {https://www.documentation.ird.fr/hor/fdi:010052092}, }