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SHR Pressure Sensor (red)

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2016

Red circles indicate pressure sensor port and external tube

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2017

Red circles indicate pressure sensor port and external tube

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2017

Red circles indicate pressure sensor port and external tube

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2017

Red circle indicates pressure sensor port and external tube

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After deployment of new sensor, the cradle is pushed slightly further into the sediment, but has not otherwise moved

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Hydrate Ridge

Internal temperature discontinuity (~0.35ºC)

Seafloor pressure discontinuity (~0.5 m)

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Hydrate Ridge

Comparison between PREST and MARUM CTD temperatures

Comparison between PREST and MARUM CTD pressures (different locations, similar tidal variations)

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Slope Base (~2900 m)

No major between-deployment discontinuities or differences from co-located CTD

Internal temperature does have a “warm-up” period after powering up, but <0.2ºC

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Axial Base (~2600 m)

No major between-deployment discontinuities or differences from co-located CTD

Internal temperature does have a “warm-up” period after powering up, but <0.2ºC