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The impact of large atmospheric disturbances on deep benthic communities isnot well known quantitatively. Observations are scarce but may reveal specificprocesses leading to turbulent disturbances. Here, we present high-resolutiondeep-ocean observations to study potential turbulent mixing by largeatmospheric disturbances. We deployed an array of 100-Hz sampling-rategeophysical broadband Ocean Bottom Seismometers (OBSs) on the seafloor. Withinthe footprint of this array we also deployed an oceanographic 1-Hzsampling-rate vertical temperature sensor string covering the water phasebetween 7 and 207 m above the seafloor at about 3000 m depth off eastern Taiwanbetween June 2017 and April 2018. All instruments registered Category 4 cycloneTyphoon Talims passage northeast of the array one day ahead of the cyclonesclosest approach when the cyclones eye was more than 1,000 km away. For 10days, a group of near-inertial motions appeared most clearly in temperature.The registration reflects the importance of barotropic response to cyclones andthe propagation of inertio-gravity waves in weak density stratification. Inaddition to internal tides, these waves drove turbulent overturns larger than200 m that were concurrently registered by OBSs. The turbulent signals wereneither due to seismic activity nor to ocean-surface wave action. Cyclones cangenerate not only microseisms and earth hums, as well as turbulence in thewater column, producing additional ground motions. Quantified turbulenceprocesses may help constrain models on sediment resuspension and its effect ondeep-sea benthic life.

Deep sea floor observations of typhoon driven enhanced ocean turbulence