Large-scale Rossby wave in the mid-latitude South Pacific from altimetry data

Details Large-scale Rossby wave in the mid-latitude South Pacific from altimetry data Large-scale Rossby wave in the mid-latitude South Pacific from altimetry data

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25..179w&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 2, p. 179-182

Physics

7

Oceanography: Physical: Sea Level Variations, Oceanography: Physical: Upper Ocean Processes, Global Change: Remote Sensing, Oceanography: Physical: Eastern Boundary Currents

Scientific paper

We present observations of large-scale Rossby wave propagation in the mid-latitude South Pacific (25°S) from analyzing 4 years of TOPEX/POSEIDON altimetry data. Using wavelet transform we separate phase propagation from amplitude modulation. The dominant Rossby wave has a wavelength of about 40° with a period close to 2 years (phase speed ~6.4cm/s). Its amplitude modulates both interannually and intraannually. In addition, we also found a shorter-scale Rossby wave with a wavelength of about 16° and a period close to 9 months.

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