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From 15 th  May to 11 th  October 2019, six Saildrone uncrewed surface vehicles (USVs) were deployed for 150-day cruises collecting a suite of atmospheric and oceanographic measurements from Dutch Harbor, Alaska, transiting the Bering Strait into the Chukchi Sea and the Arctic Ocean. Two Saildrones funded by the National Aeronautics and Space Administration (NASA), SD-1036 and SD-1037, were equipped with infrared (IR) radiation pyrometers in a &#x201C;unicorn&#x201D; structure on the deck for the determination of the ocean sea surface skin temperature (SST skin ). We present an algorithm to derive SST skin  from the downward- and upward-looking radiometers and estimate the main contributions to the inaccuracy of SST skin . After stringent quality control of data and eliminating measurements influenced by sea ice and precipitation, and restricting the acceptable tilt angles of the USV based on radiative transfer simulations, SST skin  can be derived to an accuracy of approximately 0.12 K. The error budget of the derived SST skin  is developed and the largest component comes from the instrumental uncertainties assuming the viewing geometry is adequately determined. Thus, Saildrones equipped with these sensors could provide sufficiently accurate SST skin  retrievals for studying the physics of the thermal skin effect, in conjunction with accurate subsurface thermometer measurements, and for validating satellite-derived SST skin  fields at high latitudes.

High Latitude Sea Surface Skin Temperatures Derived From Saildrone Infrared Measurements