01254nas a2200145   4500008004100000245010600041210006900147260001200216300001600228490000700244520075400251100002601005700002501031856005201056       2024                        eng d00aBrief communication: Significant biases in ERA5 output for the McMurdo Dry Valleys region, Antarctica0 aBrief communication Significant biases in ERA5 output for the Mc  c03/2024  a1207 - 12130 v183 a<p>The ERA5 climate reanalysis dataset plays an important role in applications such as monitoring and modeling climate system changes in polar regions, so the calibration of the reanalysis to ground observations is of great relevance. Here, we compare the 2 m air temperature time series of the ERA5 reanalysis and the near-surface bias-corrected reanalysis to the near-ground air temperature measured at 17 automatic weather stations (AWSs) in the McMurdo Dry Valleys, Antarctica. We find that the reanalysis data have biases that change with the season of the year and do not clearly correlate with elevation. Our results show that future work should rely on secondary observations to calibrate when using the ERA5 reanalysis in polar regions.</p>1 aGarza-Girón, Ricardo1 aTulaczyk, Slawek, M.  uhttps://tc.copernicus.org/articles/18/1207/2024