Séminaire
Today we'll have two 30 minutes-long talks. The second one will be given by
Yushi Morioka
The interannual variability of the southern part of the Canary Current system (West Africa) is explored with a special attention to the existence of abnormal seasonal warming and cooling of sea-surface temperatures just off the coast, recently depicted as "coastal Niño/Niña" phenomenon. In a region off Senegal coast, just south of Cap-Vert, the monthly variability of the sea-surface temperatures reaches its peak in boreal spring, in relation with the intensity of the trade winds in the North Atlantic. When the trade winds in late boreal winter are anomalously strong over the region, the coastal sea-surface temperatures become anomalously cooler in early boreal spring, while the coastal upwelling is enhanced. When the coastal winds in late boreal winter are anomalously weak, the coastal sea-surface temperatures become anomalously warmer in early boreal spring, while the coastal upwelling is reduced, highlighting the possible existence of a local air-sea interaction. The change in sea-surface temperature has an impact on the fishery activity in the region. This also affects the air temperature of surrounding areas, but the influence on the rainfall is not significant.