Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2477d&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 16, p. 2477-2480
Physics
8
Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions, Geodesy And Gravity: Rotational Variations, Oceanography: Physical: El Nino, Atmospheric Composition And Structure: General Or Miscellaneous
Scientific paper
The impact of the 1997-1998 ENSO event is presented in context of axial Earth-atmosphere angular momentum exchange utilizing length of day (LOD), Southern Oscillation Index (SOI) and atmospheric angular momentum (AAM) data from 1970 to 1998; comparisons are made with previous events. The analysis of equal-area latitudinally belted AAM from the NCEP reanalysis (1958-98) reveals slow global coherent poleward propagation of angular momentum. These structures originate in the equatorial regions, penetrate into high latitudes and are bimodal in nature with variations centered at low-frequency (LF~4.7yr) and quasi-biennial (QB~2.4yr) periods. Analyses utilize both a recursive filter and multichannel singular spectrum analysis (M-SSA).
Dickey Jean O.
Gegout Pascal
Marcus Steven L.
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