Sea surface height observations of the 34N 'waveguide' in the North Atlantic.
We present a study of the energetic zonal band at 34oN 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 anal...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2001
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| Online Access: | http://nora.nerc.ac.uk/id/eprint/100202/ https://nora.nerc.ac.uk/id/eprint/100202/1/Cromwell.pdf http://www.agu.org/journals/gl/gl0119/2001GL012936/pdf/2001GL012936.pdf |
| Summary: | We present a study of the energetic zonal band at 34oN 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 34oN 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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