| Summary: | An extratropical cyclone reported to have the largest wind speed in Newfoundland in more<br />than a decade landed on the island of Newfoundland on 11 March 2017. The oceanic responses in<br />Placentia Bay on the southeast coast of Newfoundland to the winter storm were examined using<br />observed data and the Finite-Volume Community Ocean Model (FVCOM). The peak non-tidal water<br />level increase, i.e., storm surge, reached 0.85mat St. Lawrence and 0.77mat Argentia on Placentia Bay.<br />Sea surface temperature slightly decreased after the storm passage according to buoy and satellite<br />measurements. Root mean square dierences (RMSD) of the magnitude of storm surge between model<br />results and observations are 0.15 m. The model sea surface temperature showed a small decrease,<br />consistent with observations, with RMSDs from 0.19 to 0.64 C at buoy stations. The simulated<br />surface current changes agree with buoy observations, with model-observation velocity dierence<br />ratios (VDR) of 0.75−0.88. It was found that, at Argentia (St. Lawrence), the peak storm surge in<br />Placentia Bay was dominantly (moderately) associated with the inverse barometric eect, and the<br />subsequent negative surge was mainly due to the wind eect at both stations. The sea surface cooling<br />was associated with oceanic heat loss. In the momentum balance, the Coriolis, pressure gradient,<br />and advection terms were all important during the storm, while the first two terms were predominant<br />before and after the storm.
|
|---|
