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Article dans une revue Geophysical Research Letters Année : 2011

West African Monsoon influence on the summer Euro-Atlantic circulation

Résumé

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-latitudes circulation. A strong monsoon is related to high-pressure anomalies over the Azores and positive NAO phases.
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hal-00582619, version 1 (29-10-2021)

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Marco Gaetani, Benjamin Pohl, Hervé Douville, Bernard Fontaine. West African Monsoon influence on the summer Euro-Atlantic circulation. Geophysical Research Letters, 2011, 38, pp.L09705. ⟨10.1029/2011GL047150⟩. ⟨hal-00582619⟩
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