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Zonal index and circulation change in the north Atlantic area, 1873–1972
Author(s) -
Makrogiannis T. J.,
Bloutsos A. A.,
Giles B. D.
Publication year - 1982
Publication title -
journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0196-1748
DOI - 10.1002/joc.3370020206
Subject(s) - index (typography) , circulation (fluid dynamics) , climatology , period (music) , environmental science , geography , atmospheric sciences , geology , physics , mechanics , world wide web , computer science , acoustics
Abstract Monthly and annual values are calculated of a zonal index based on surface pressure at 35°N and 55°N between 60°W and 10°W. The period under study, 1873‐1972, is divided into three sub‐periods which approximate with three epochs proposed by Lamb (1972). A comparison of our indices with Lamb's results is followed by a discussion of our monthly index, and the rarity of easterly flow in the 100‐year period is noted. The results are subjected to a trend and a power spectrum analysis and the latter indicates a number of periodicities some of which are not easily explicable.