S.Y. Kim, et al.
Journal of Geophysical Research-Oceans, 118(12), pp. 6791-6806, (2013)
The network comprising 61 high-frequency radar systems along the U.S.
West Coast (USWC) provides a unique, high resolution, and broad scale
view of ocean surface circulation. Subinertial alongshore surface
currents show poleward propagating signals with phase speeds of O(10) and O(100–300)
that are consistent with historical in situ observations off the USWC
and that can be possibly interpreted as coastally trapped waves (CTWs).
The propagating signals in the slow mode are partly observed in southern
California, which may result from scattering and reflection of
higher-mode CTWs due to curvature of shoreline and bathymetry near Point
Conception, California. On the other hand, considering the order of the
phase speed in the slow mode, the poleward propagating signals may be
attributed to alongshore advection or pressure-driven flows. A
statistical regression of coastal winds at National Data Buoy Center
buoys on the observed surface currents partitions locally and remotely
wind-forced components, isolates footprints of the equatorward
propagating storm events in winter off the USWC, and shows the poleward
propagating signals year round.