Biophysical variability in the Kuroshio Extension from Altimeter and SeaWiFS
Abstract
Ten years (1998-2007) of Sea Level Anomaly
(SLA) from multiple satellite altimeters and chlorophyll-a
concentration from the Sea-viewing Wide Field-of-view
Sensor (SeaWiFS) were used to investigate the eddy
structure and associated biophysical processes in the
Kuroshio Extension (KE) region near 35o
N. Seasonal
SeaWiFS chlorophyll-a concentrations cycles and annual
changes of altimeter SLA are derived for the subtropical
North Pacific near 35°N and along the KE axis. Spatial
structure of SeaWiFS is determined as the deviations from
a local seasonal cycle and examined in relation to altimeter
eddy structure. In the KE region, SeaWiFS structure is
evident during the spring bloom period with a scale around
460 km. Eddy propagation speeds and scales are examined.
Cold-core (cyclonic) rings correspond to areas of high
SeaWiFS chlorophyll-a. Warm-core (anticyclonic) rings
relate to areas of low chlorophyll-a concentration.
SeaWiFS chlorophyll-a anomalies and Altimeter SLA
structure have an overall negative correlation coefficient of
r=−0.36. Swirl currents between eddies redistribute surface
chlorophyll concentrations and can spatially bias maximum
and minimum concentration levels off eddy center.
Description
IEEE/MTS OCEANS 2009
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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