West African Monsoon influence on the summer Euro-Atlantic circulation

被引：36
作者：
Gaetani, Marco [1 ,2 ]
Pohl, Benjamin [3 ]
Douville, Herve [4 ]
Fontaine, Bernard [3 ]
机构：
[1] CNR, Ist Biometeorol, IBIMET, I-00185 Rome, Italy
[2] Univ Aquila, CETEMPS, I-67100 Laquila, Italy
[3] Univ Bourgogne, CNRS, CRC, F-21000 Dijon, France
[4] Meteo France, CNRS, CNRM GAME, F-31057 Toulouse 1, France
来源：
GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷
关键词：
D O I：
10.1029/2011GL047150
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
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. Citation: Gaetani, M., B. Pohl, H. Douville, and B. Fontaine (2011), West African Monsoon influence on the summer Euro-Atlantic circulation, Geophys. Res. Lett., 38, L09705, doi: 10.1029/2011GL047150.
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页数：5
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