Caractérisation du tournant climatique des années 1970 en Afrique du nord-ouest

摘要

The recent climate chanse in northwest Africa presents locallv sienificant changes for several parameters. This situation is confirmed over the ?eriod 1950–2008. between Morocco and Mauritania and the nearbv ocean. This studv is dedicated to the linear trends and breaks of trend in annual average series, of the air temperature at 2 m, the atmospheric pressure at Sea Level (rated PNM) and wind direction (at 10 m level) from the north, northeast and east. The analysis confirms a modification of the climate in the 1970s. This modification does not reflect homoeeneous trends. Thus the thermal evolution varies with a local increase of the temperatures over the Atlantic Ocean between 40°N and 14°N. while on the continent. Morocco is eettins warmer but in eastern Mauritania we have observed a coolina trend. The increase of atmospheric pressure is accompanied by a change in direction of the Harmattan's winds, with an increase in eastern winds.