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.

Fichier principal
Vignette du fichier
2011GL047150.pdf (442.09 Ko) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Licence

Dates et versions

hal-00582619 , version 1 (29-10-2021)

Licence

Identifiants

Citer

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⟩
319 Consultations
152 Téléchargements

Altmetric

Partager

  • More