The Spatial Variability of Coastal Surface Water Temperature During Upwelling

F. L. Scarpace Marine Studies Center, University of Wisconsin, Madison 53706

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T. Green III Marine Studies Center, University of Wisconsin, Madison 53706

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Abstract

Thermal scanner imagery acquired during a field experiment designed to study an upwelling event in Lake Superior is investigated. Temperature data were measured by the thermal scanner, with a spatial resolution of 7 m. These data were correlated with temperatures measured from boats. One- and two- dimensional Fourier transforms of the data were calculated and temperature variances as a function of wavenumber were plotted. A k−3 dependence of the temperature variance on wavenumber was found in the wavenumber range of 1 to 25 km−1. At wavenumbers >25 km−1. a k−5/3 dependence was found.

Abstract

Thermal scanner imagery acquired during a field experiment designed to study an upwelling event in Lake Superior is investigated. Temperature data were measured by the thermal scanner, with a spatial resolution of 7 m. These data were correlated with temperatures measured from boats. One- and two- dimensional Fourier transforms of the data were calculated and temperature variances as a function of wavenumber were plotted. A k−3 dependence of the temperature variance on wavenumber was found in the wavenumber range of 1 to 25 km−1. At wavenumbers >25 km−1. a k−5/3 dependence was found.

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