Evaluation of Greenland near surface air temperature datasets
J. E. Jack Reeves Eyre and Xubin Zeng
Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, 85721, USA
Received: 25 Dec 2016 – Accepted for review: 28 Dec 2016 – Discussion started: 02 Jan 2017
Abstract. Near-surface air temperature (SAT) over Greenland has important effects on mass balance of the ice sheet, but it is unclear which SAT datasets are reliable in the region. Here extensive in-situ SAT measurements (~ 1400 station-years) are used to assess monthly mean SAT from seven global reanalysis datasets, four gridded SAT analyses, one satellite retrieval and two dynamically downscaled reanalyses. Strengths and weaknesses of these products are identified, and their biases are found to vary by season and glaciological regime. MERRA2 reanalysis overall performs best with mean absolute error less than 2 °C in all months. Ice sheet-average annual mean SAT from different datasets are highly correlated in recent decades, but their 1901–2000 trends differ even in sign. Compared with the MERRA2 climatology combined with gridded SAT analysis anomalies, thirty-one earth system model historical runs from the CMIP5 archive reach ~ 5 °C for the 1901–2000 average bias and have opposite trends for a number of sub-periods.
Reeves Eyre, J. E. J. and Zeng, X.: Evaluation of Greenland near surface air temperature datasets, The Cryosphere Discuss., doi:10.5194/tc-2016-297, in review, 2017.