Static and dynamic performance of the RBRargo3 CTD

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Dever, Mathieu
Owens, W. Brechner
Richards, Clark G.
Wijffels, Susan E.
Wong, Annie P. S.
Shkvorets, Igor
Halverson, Mark
Johnson, Greg
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In situ oceanic observations
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.
Author Posting. © American Meteorological Society, 2022. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of the Atmospheric and Oceanic Technology 39(10), (2022): 1525–1539,
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Dever, M., Owens, B., Richards, C., Wijffels, S., Wong, A., Shkvorets, I., Halverson, M., & Johnson, G. (2022). Static and dynamic performance of the RBRargo3 CTD. Journal of Atmospheric and Oceanic Technology, 39(10), 1525–1539.
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