Sea surface height observations of the 34°N ``waveguide'' in the North Atlantic

Details Sea surface height observations of the 34°N ``waveguide'' in the North Atlantic Sea surface height observations of the 34°N ``waveguide'' in the North Atlantic

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3705c&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 19, p. 3705-3708

Other

9

Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Physical: Sea Level Variations, Oceanography: Physical: Surface Waves And Tides, Oceanography: Physical: Upper Ocean Processes

Scientific paper

We present a study of the energetic zonal band at 34°N in the North Atlantic using a wavelet analysis of more than 8 years of TOPEX/POSEIDON altimeter data. It is already well-established in the literature that this zonal `waveguide' is dominated by large-scale propagating features. The wavelet analysis yields sea surface height variance at a range of periods and wavelengths, allowing us to observe and quantify evolution of the features in space and time. Signal variance west of the mid-Atlantic ridge at 34°N is larger than to the east of the ridge: by a factor of ~2 in the period band 0.5-0.9 years, in which baroclinic Rossby waves and eddies propagate. The period of the peak energy is reduced crossing the ridge from ~1 year to ~7-9 months, before rising again to the annual cycle on the other side. There is also evidence of energy peaks at periods of ~2-4 years in the Gulf Stream region and east of the ridge.

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