XBT science: Assessment of instrumental biases and errors
2016
AbstractExpendable
bathythermograph(XBT) data were the major component of the ocean temperature profile observations from the late 1960s through the early 2000s, and XBTs still continue to provide critical data to monitor surface and
subsurface currents, meridional heat transport, and
ocean heat content. Systematic errors have been identified in the XBT data, some of which originate from computing the depth in the profile using a theoretically and experimentally derived fall-rate equation (FRE). After in-depth studies of these
biasesand discussions held in several workshops dedicated to discussing XBT
biases, the XBT
science communitymet at the Fourth XBT Science Workshop and concluded that XBT
biasesconsist of 1) errors in depth values due to the inadequacy of the probe motion description done by standard FRE and 2) independent pure temperature
biases. The depth error and temperature bias are temperature dependent and may depend on the data acquisition and recording system. In addition, the depth bia...
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