Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809705g&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 9, CiteID L09705
Physics
3
Global Change: Climate Dynamics (0429, 3309), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Global Climate Models (1626, 4928), Geographic Location: Africa, Geographic Location: Atlantic Ocean
Scientific paper
The West African Monsoon (WAM) influence on the interannual variability of the summer atmospheric circulation over North Atlantic and Europe is investigated over the period 1971-2000. A set of sensitivity experiments performed through the Arpege-Climat Atmospheric General Circulation Model is analyzed, using the so-called “grid-point nudging” technique, where the simulated atmospheric fields in the WAM region are relaxed towards the ERA40 reanalysis. Observations confirm that a sizable part of the Euro-Atlantic circulation variability is related to the WAM, with anomalies of reinforced convection in the Sudan-Sahel region associated with positive North Atlantic Oscillation (NAO) phases and subsidence over eastern Mediterranean. The nudged simulations highlights the role of the WAM in driving the mid-latitude circulation. A strong monsoon is related to high-pressure anomalies over the Azores and positive NAO phases.
Douville Hervé
Fontaine Bernard
Gaetani Marco
Pohl Benjamin
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