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| Titel |
Barometric tides from ECMWF operational analyses |
| VerfasserIn |
R. D. Ray, R. M. Ponte |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 8 ; Nr. 21, no. 8, S.1897-1910 |
| Datensatznummer |
250014686
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| Publikation (Nr.) |
 copernicus.org/angeo-21-1897-2003.pdf |
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| Zusammenfassung |
The solar diurnal and
semidiurnal tidal oscillations in surface pressure are extracted from the
operational analysis product of the European Centre for Medium Range Weather
Forecasting (ECMWF). For the semidiurnal tide this involves a special temporal
interpolation, following Van den Dool et al. (1997). The resulting tides are
compared with a "ground truth" tide data set, a compilation of
well-determined tide estimates deduced from many long time series of station
barometer measurements. These comparisons show that the ECMWF (analysis) tides
are significantly more accurate than the tides deduced from two other widely
available reanalysis products. Spectral analysis of ECMWF pressure series shows
that the tides consist of sharp central peaks with modulating sidelines at
integer multiples of 1 cycle/year, superimposed on a broad cusp of stochastic
energy. The integrated energy in the cusp dominates that of the side-lines.
This complicates the development of a simple empirical model that can
characterize the full temporal variability of the tides.
Key words. Meteorology and
atmospheric dynamics (waves and tides) |
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