NDLI: Surface transport and mixing in Monterey Bay. I: Objective surface current maps

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Surface transport and mixing in Monterey Bay. I: Objective surface current maps

Content Provider	IEEE Xplore Digital Library
Author	Lipphardt Jr., B.L. Kirwan Jr., A.D. Grosch, C.E. Paduan, J.D. Wiggins, S. Small, D. Ide, K.
Copyright Year	2003
Description	Author affiliation: Delaware Univ., Newark, DE, USA (Lipphardt, B.L., Jr.)
Abstract	"Summary form only given". HF radars measure synoptic surface currents near the coast at time intervals like one hour with spatial resolution of a few kilometers. Although increasing numbers of HF radars make synoptic surface current maps routinely available, these maps are not useful for environmental or ecological studies, which require quantitative descriptions of near surface transport to study the impacts of upwelling, the ecology of nearshore habitats, or the effects of harmful algal blooms or oil spills. Particle studies provide a natural way to reveal synoptic surface transport properties embedded in a synoptic Eulerian velocity archive. Particle trajectories cannot easily be computed directly from an HF radar surface current archive, since the measurements contain space and time gaps and do not extend to the shoreline. Here we apply a technique called normal mode analysis (NMA) to objectively map HF radar surface current archives in Monterey Bay so that particle trajectories can be reliably computed. The NMA technique uses two sets of basis functions (vorticity modes and divergence modes) and exactly enforces no normal flow at the coastline and a specified normal flow (obtained from the radar measurements themselves) along the open boundaries. Spatial filtering is applied to reduce white noise, and an eight hour low-pass filter (with a sharp cutoff) is used to limit large accelerations while preserving semidiurnal fluctuations. The resulting objective maps typically recover about 70% of the mean kinetic energy in the radar measurements. This is the first of three talks describing the computation of synoptic maps of particle properties from HF radar measurements in Monterey Bay.
Sponsorship	Dept. of the Navy Sci. and Technol. Coalition for Enhanced Marine Resources Orincon Ceros Harbour Offshore Inc
File Size	52557
File Format	PDF
ISBN	0933957300
DOI	10.1109/OCEANS.2003.178213
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-09-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Hafnium Radar measurements Current measurement Time measurement Low pass filters Spatial resolution Environmental factors Petroleum Spaceborne radar Particle measurements
Content Type	Text
Resource Type	Article

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