By simulating expendable bathythermograph observations since the 1970s in a high horizontal resolution ocean model , the authors show that historical XBT errors can produce biases that are higher than the intrinsic trends and that are statistically significant after the 1990s, coincident with changes made in some of the XBT probe components.
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The original paper was published online in March 2015: onlinelibrary.wiley.com/doi/10.1002/2014GL061802/abstract