Evidence of two regimes of easterly waves over West Africa and the tropical Atlantic

被引：68

作者：

Diedhiou, A ^{[1
]}

Janicot, S ^{[1
]}

Viltard, A ^{[1
]}

de Felice, P ^{[1
]}

机构：

[1] Ecole Polytech, CNRS, Meteorol Dynam Lab, F-91128 Palaiseau, France

来源：

GEOPHYSICAL RESEARCH LETTERS | 1998年 / 25卷 / 15期

关键词：

D O I：

10.1029/98GL02152

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Synoptic-scale easterly waves at 700 hPa have been studied over West Africa and the tropical Atlantic for the summers of 1979-1995. Spectral analyses (Fast Fourier and Wavelet Transforms) of 700 hPa meridional wind component along 17.5 degrees N enable to point out two band-periods, between 3 and 5 days and between 6 and 9 days. An example of each wave is shown. Composite analysis confirms the evidence of two such regimes of easterly waves during summer over West Africa and the tropical Atlantic. The 6-9-day wave regime differ from the 3-5-day wave regime by larger anticyclonic cells originated from the Libyan and the Azores areas, and by more northern tracks.

引用

页码：2805 / 2808

页数：4

共 32 条

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