Event-scale Internal Tide Variability via X-band Marine Radar
arxiv(2024)
摘要
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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