Non-tidal aliasing in seasonal sea-level variability and annual Rossby waves as observed by satellite altimetry

Type Article
Date 1997-11
Language English
Author(s) Chen Ge1, Ezraty Robert2
Affiliation(s) 1 : UNIV GINGDAS,OCEAN REMOTE SENSING INST,GINGDAS 266003,PEOPLES R CHINA.
2 : IFREMER,CTR BREST,DEPT OCEANOG SPATIALE,F-29280 PLOUZANE,FRANCE.
Source Annales Geophysicae-atmospheres Hydrospheres And Space Sciences (0992-7689) (Springer Verlag), 1997-11 , Vol. 15 , N. 11 , P. 1478-1488
DOI 10.1007/s00585-997-1478-z
WOS© Times Cited 9
Abstract

It is becoming well known that aliasing associated with ocean tides could be a major source of systematic error in altimeter sea-level measurements. due to asynoptic sampling and imperfect tide modelling. However, it has been shown that signals of non-tidal origin may also contribute significantly to the observed aliasing. In this paper, numerical simulations are performed to demonstrate the full aliasing potential associated with altimeter observations of seasonal sealevel variability and annual Rossby waves. Our results indicate that ignorance of non-tidal aliasing may lead to the possibility of underestimating the total aliasing and misinterpreting or overlooking existing geophysical phenomena. Therefore, it is argued that an entice aliasing picture should be kept in mind when satellite altimeter data are analysed.

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