Richards Clark G.

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Richards
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Clark G.
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  • Article
    Static and dynamic performance of the RBRargo3 CTD
    (American Meteorological Society, 2022-10-01) Dever, Mathieu ; Owens, W. Brechner ; Richards, Clark G. ; Wijffels, Susan E. ; Wong, Annie P. S. ; Shkvorets, Igor ; Halverson, Mark ; Johnson, Greg
    The static and dynamic performances of the RBRargo3 are investigated using a combination of laboratory-based and in situ datasets from floats deployed as part of an Argo pilot program. Temperature and pressure measurements compare well to co-located reference data acquired from shipboard CTDs. Static accuracy of salinity measurements is significantly improved using 1) a time lag for temperature, 2) a quadratic pressure dependence, and 3) a unit-based calibration for each RBRargo3 over its full pressure range. Long-term deployments show no significant drift in the RBRargo3 accuracy. The dynamic response of the RBRargo3 demonstrates the presence of two different adjustment time scales: a long-term adjustment O(120) s, driven by the temperature difference between the interior of the conductivity cell and the water, and a short-term adjustment O(5–10) s, associated to the initial exchange of heat between the water and the inner ceramic. Corrections for these effects, including dependence on profiling speed, are developed.