ANNUAL PERIOD EQUATORIAL WAVES IN THE PACIFIC-OCEAN

Citation
S. Minobe et K. Takeuchi, ANNUAL PERIOD EQUATORIAL WAVES IN THE PACIFIC-OCEAN, J GEO RES-O, 100(C9), 1995, pp. 18379-18392
Citations number
42
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Oceanografhy
Journal title
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN journal
2169-9275 → ACNP
Volume
100
Issue
C9
Year of publication
1995
Pages
18379 - 18392
Database
ISI
SICI code
2169-9275(1995)100:C9<18379:APEWIT>2.0.ZU;2-3
Abstract
This paper analyzes behavior of annual period equatorial waves and the ir role in oceanic variations, namely, the sea level displacement, zon al current, and sea surface temperature (SST) along the equator in the Pacific. Using; a linear model forced by observed wind stress, the am plitudes and phases of the annual equatorial waves are calculated. The model equatorial waves are compared with the waves decomposed from Le vitus' (1982) climatological density data. The modeled and decomposed first-meridional-mode Rossby waves of the two gravest vertical modes i ndicate common features that those waves are forced in the eastern Pac ific and propagate to the central Pacific. These first-meridional-mode Rossby waves play a dominant role in the model sea level displacement and cause the westward propagating feature in the model surface zonal current in the central Pacific. The analysis suggests that the propag ation of the surface zonal current is significantly responsible for th e well-known westward propagation of annual SST variation in this regi on. The modeled and decomposed Kelvin waves are significantly differen t, but the model suggests that the role of the annual Kelvin waves in the equatorial oceanic variations is smaller than that of the first-me ridional-mode Rossby waves.