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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2018-104
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model evaluation paper 18 Jun 2018

Model evaluation paper | 18 Jun 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Evaluation of the atmosphere-land-ocean-sea ice interface processes in the Regional Arctic System Model Version 1 (RASM1) using local and globally gridded observations

Michael A. Brunke1, John J. Cassano2, Nicholas Dawson3, Alice K. DuVivier4, William J. Gutowski Jr.5, Joseph Hamman4, Wieslaw Maslowski7, Bart Nijssen6, J. E. Jack Reeves Eyre1, Jose C. Renteria8, Andrew Roberts7, and Xubin Zeng1 Michael A. Brunke et al.
  • 1Department of Hydrology and Atmospheric Sciences, The University of Arizona, Tucson, AZ 85719, USA
  • 2Cooperative Institute for Research in Environmental Sciences and Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO 80309, USA
  • 3Idaho Power, Boise, ID 83702, USA
  • 4National Center for Atmospheric Research, Boulder, CO 80305, USA
  • 5Department of Geological and Atmospheric Sciences, Iowa State University, Ames, IA 50011, USA
  • 6Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, USA
  • 7Department of Oceanography, Naval Postgraduate School, Monterey, CA 93943, USA
  • 8U.S. Department of Defense, High Performance Computing Modernization Program, Lorton, VA 22079, USA

Abstract. The Regional Arctic System Model version 1 (RASM1) has been developed to provide high-resolution simulations of the Arctic atmosphere-ocean-sea ice-land system. Here, we provide a baseline for the capability of RASM to simulate interface processes by comparing retrospective simulations from RASM1 for 1990–2014 with the Community Earth System Model version 1 (CESM1) and the spread across three recent reanalyses. Evaluations of surface and 2-m air temperature, surface radiative and turbulent fluxes, precipitation, and snow depth in the various models and reanalyses are performed using global and regional datasets and a variety of in situ datasets, including flux towers over land, ship cruises over oceans, and a field experiment over sea ice. These evaluations reveal that RASM1 simulates precipitation that is similar to CESM1, reanalyses, and satellite-gauge combined precipitation datasets over all river basins within the RASM domain. The possible reasons for this result are discussed. Snow depth in RASM is closer to upscaled surface observations over a flatter region than in more mountainous terrain in Alaska. The sea ice interface is well simulated in regards to radiation fluxes which generally fall within observational uncertainty. RASM1 surface temperature and radiation biases are shown to be due to biases in the simulated mean diurnal cycle. Development of RASM2 aims to address these biases.

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Michael A. Brunke et al.
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Short summary
The Regional Arctic System Model version 1 (RASM1) was recently developed for high-resolution simulation of the coupled atmosphere-ocean-sea ice-land system in the Arctic. Its simulation of the atmosphere-land-ocean-sea ice interface is evaluated by using the spread in recent reanalyses and a global Earth system model as baselines. Such comparisons reveal that RASM1 simulates precipitation well and improves the simulation of surface fluxes over sea ice.
The Regional Arctic System Model version 1 (RASM1) was recently developed for high-resolution...
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