An EOF analysis of HF Doppler radar current measurements of the ChesapeakeBay buoyant outflow

Surface currents measured by HF Doppler radar as part of a study of the Che sapeake Bay outflow plume are examined using a 'real-vector' empirical orth ogonal function (EOF) analysis (Kaihatu et al., 1998). Based on about 23 da ys of nearly continuous data, the analysis shows that the first three EOF m odes, judged to be the only significant modes, account for 76% of the varia nce in the data set. The buoyant outflow occurs primarily in the mean flow field. The first EOF mode is dominated by wind forcing and the second mode by across-shelf semi-diurnal tidal forcing. The third mode exhibits a large -scale horizontal shear and contains a curved region of weak relative flow which appears to delineate the offshore edge of the plume; also, the third- mode response varies over the spring-neap cycle, suggesting a modulation of the outflow plume by a tidal residual eddy. The analysis therefore has pro vided a useful, exploratory examination of this dataset of surface currents . (C) 1999 Elsevier Science Ltd. All rights reserved.