An investigation of offshore circulation using satellite data and feature tracking techniques.
Lennon, Gary R.
Smith, David C. IV
Batteen, Mary L.
MetadataShow full item record
Satellite-derived sea surface motion vectors are obtained for an area 100 to 300 kilometers from the central California coast south of Point Arena. These vectors are compared with hydrographic data acquired during the OPTOMA 21 cruise. Three AVHRR images, with 24 hour spacing between images, are used to create two sets of sea surface flow vectors. The vectors obtained show only limited agreement with geostrophic velocities computed relative to 750 meters. There is good agreement when the geostrophic flow is strong and persistent submesoscale features are advected by the flow. Unfortunately this technique is only able to identify some of the strong flows and its utility for identifying weak ( < 10 cm/ sec) flows is questionable. There are numerous eddies and perturbations in the surface flow in this area that cannot be resolved by this technique when the images are 24 hours apart. Cloud contamination in the second image emphasizes the dependence of this technique on an unobstructed view of the ocean. Nevertheless, when used with an understanding of its limitations, the feature tracking technique can be a useful method of interpreting satellite oceanographic data.
RightsThis 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.
Showing items related by title, author, creator and subject.
Sea surface current estimates off Central California as derived from enhanced AVHRR infrared images Fang, Chung-Ming (1987-09);A technique is presented which uses an interactive computer program to estimate sea surface current velocity from the displacement of sea surface temperature (SST) patterns apparent in enhanced sequential Infrared (IR)images ...
Carsten, David M. (Monterey, California. Naval Postgraduate School, 2000);An algorithm used to composite SSM/I 85.5 GHz imagery and derive sea ice motion was adapted for operational testing at Fleet Numerical Meteorology and Oceanography Command (FNMOC). A feature tracking technique was applied ...
Kim, John W. (Monterey, CA; Naval Postgraduate School, 2020);In recent years, new acoustic stealth platforms, which have the potential to operate invisibly from human sonar operators, have emerged from near-peer competitor nations. In response to the challenges presented by acoustic ...