Atmospheric water cycle and moisture fluxes in the West African monsoon: mean annual cycles and relationship using NCEP/NCAR reanalysis

Details Atmospheric water cycle and moisture fluxes in the West African monsoon: mean annual cycles and relationship using NCEP/NCAR reanalysis Atmospheric water cycle and moisture fluxes in the West African monsoon: mean annual cycles and relationship using NCEP/NCAR reanalysis

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30c..17f&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 3, pp. 17-1, CiteID 1117, DOI 10.1029/2002GL015834

Physics

20

Meteorology And Atmospheric Dynamics: Climatology (1620), Meteorology And Atmospheric Dynamics: Tropical Meteorology, Meteorology And Atmospheric Dynamics: Precipitation (1854)

Scientific paper

Atmospheric water (Precipitation minus Evaporation, P-E) and moisture fluxes from the NCEP/NCAR and observed rainfall data from the Climatic Research Unit are analyzed over the West African Monsoon region (WAM: 5°N-20°N 18°W-18°E) on the period 1968-1998. The main results show that 1) P-E averaged over the 15°N-20°N belt in July-September (JAS) is a better proxy of observed rainfall in Sudan-Sahel (12°N-18°N) than NCEP/NCAR rainfall in this reanalysis; 2) part of the moisture fluxes vertically integrated in the layers 1000-300 hPa or 1000-925 hPa advected into WAM originate from the Mediterranean sea and Central Africa; 3) their interannual March-April and JAS variations, especially north of 20°N, present significant relationship with Sahelian P-E in JAS; 4) at more local scales moisture advections and convergences are also significantly associated with observed Sudan-Sahel rainfall and, in wet (dry) situations, with a clear dominance of westerly (easterly) anomalies in the moisture flux south of 15°N.

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