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Puzzling over the dynamics of the Lofoten Basin - a sub-Arctic hot spot of ocean variability

Название публикации: 
Puzzling over the dynamics of the Lofoten Basin - a sub-Arctic hot spot of ocean variability.
Тип: 
Публикация
Авторы: 
Denis L, Volkov
Tatyana V. Belonenko
Victor R, Foux
Выходные данные публикации: 
GEOPHYSICAL RESEARCH LETTERS. Vol. 40, Issue 4, Feb. 2013. P . 7 38-7 43. doi: 1 0. 1 002 1 911.50126.
Дата публикации: 
2013-02
Аннотация: 
<p>[1] A sub-Arctic &ldquo;hot spot&rdquo; of intense synoptic-scale variability is observed in the Lofoten Basin (LB) of the Norwegian Sea. Using ERS-1/2 and Envisat satellite altimetry measurements, we discover a cyclonic propagation of the synoptic-scale sea surface height anomalies around the center of the LB. Surface drifter trajectories do not reveal an associated coherent near-surface cyclonic flow suggesting that the propagating signals have a wavelike nature. We identify a dipole and a quadrupole wave modes rotating around the center of the LB, obtain analytic dispersion relations for these modes, and demonstrate that the observed propagation is a manifestation of topographic Rossby waves. Most of the observed waves have a wavelength of about 500&thinsp;km and phase speeds ranging from 2 to 10&thinsp;km/day. We show that these waves are largely responsible for the localization and amplification of sea surface height variability in the center of the LB.</p>
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