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arXiv · 2404.18218

Event-scale Internal Tide Variability via X-band Marine Radar

Alexandra J. Simpson·Jacqueline M. McSweeney·James A. Lerczak·Merrick C. Haller
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Abstract

A combined radar remote sensing and in situ data set is used to track packets of nonlinear internal waves as they propagate and shoal across the inner shelf (40m - 9m). The dataset consists of high space-time resolution (5m, 2min) radar image time series collected over a 10km radial footprint, with over a dozen synchronous and co-located moorings measuring temperature, salinity, and velocity throughout the water column. The internal bores and higher-frequency internal waves that make up the internal tide are tracked in the radar image time series and, therefore, provide continuous cross-shore speed and angle estimates as the waves propagate across the inner shelf. We compare radar-estimated speeds to those estimated from moorings and confirm a cross-shore shoaling profile that deviates from linear theory. We additionally use combined remote sensing and in situ data to perform a detailed analysis on four consecutive internal tides. These analyses reveal intra-packet speed variability, tide-tide influences, reflected internal waves, and an instance of internal wave polarity reversal observed in the radar and moorings.

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Alexandra J. Simpson, Jacqueline M. McSweeney, James A. Lerczak, Merrick C. Haller. 2024-04-28. Event-scale Internal Tide Variability via X-band Marine Radar. https://arxiv.org/abs/2404.18218

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