Open AccessAnnual pressure oscillation from sea level to I00 mb in the northern hemisphere
Author(s) -
G. C. Asnani,
Saroj K. Mishra
Publication year - 1975
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v26i3.2289
Subject(s) - climatology , geopotential height , latitude , northern hemisphere , oscillation (cell signaling) , southern hemisphere , environmental science , amplitude , annual cycle , atmospheric sciences , southern oscillation , geopotential , north atlantic oscillation , sea level , geology , geography , el niño southern oscillation , meteorology , physics , oceanography , precipitation , geodesy , quantum mechanics , biology , genetics
From climatological normals of about 250 upper air observatories in the northern hemisphere, the annual mean, the annual oscillation and the semi-annual oscillation in the geopotential height of 850, 700, 500, 300, 200 and 100 mb pressure levels have been worked out; while the features of semi-annual oscillation are discussed elsewhere (Asnani and Verma 1975). The characteristics of annual mean, and annual oscillation are presented here. At long and above 700 mb level the maximum occurs first at the polar latitudes and then at sub-tropical latitudes with a lag 300 of about 3 to 4 weeks. At and south of won the amplitude is maximum at 200-mb level; at higher latitudes, the amplitude increases upto 100-mb level, the last level of our analysis.
The annual mean picture as well as the annual oscillation exhibit some special features over the Asian region.