Title
Development of the Regional Arctic System Model (RASM): Near-Surface Atmospheric Climate Sensitivity
Campus Units
Geological and Atmospheric Sciences
Document Type
Article
Publication Version
Published Version
Publication Date
8-2017
Journal or Book Title
Journal of Climate
Volume
30
Issue
15
First Page
5729
Last Page
5753
DOI
10.1175/JCLI-D-15-0775.1
Abstract
The near-surface climate, including the atmosphere, ocean, sea ice, and land state and fluxes, in the initial version of the Regional Arctic System Model (RASM) are presented. The sensitivity of the RASM near-surface climate to changes in atmosphere, ocean, and sea ice parameters and physics is evaluated in four simulations. The near-surface atmospheric circulation is well simulated in all four RASM simulations but biases in surface temperature are caused by biases in downward surface radiative fluxes. Errors in radiative fluxes are due to biases in simulated clouds with different versions of RASM simulating either too much or too little cloud radiative impact over open ocean regions and all versions simulating too little cloud radiative impact over land areas. Cold surface temperature biases in the central Arctic in winter are likely due to too few or too radiatively thin clouds. The precipitation simulated by RASM is sensitive to changes in evaporation that were linked to sea surface temperature biases. Future work will explore changes in model microphysics aimed at minimizing the cloud and radiation biases identified in this work.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Cassano, John J.; DuVivier, Alice; Roberts, Andrew; Hughes, Mimi; Seefeldt, Mark; Brunke, Michael; Craig, Anthony; Fisel, Brandon; Gutowski, William; Hamman, Joseph; Higgins, Matthew; Maslowski, Wieslaw; Nijssen, Bart; Osinski, Robert; and Zeng, Xubin, "Development of the Regional Arctic System Model (RASM): Near-Surface Atmospheric Climate Sensitivity" (2017). Geological and Atmospheric Sciences Publications. 279.
https://lib.dr.iastate.edu/ge_at_pubs/279
Included in
Atmospheric Sciences Commons, Climate Commons, Oceanography Commons, Statistical Models Commons
Comments
This article is published as Cassano, John J., Alice DuVivier, Andrew Roberts, Mimi Hughes, Mark Seefeldt, Michael Brunke, Anthony Craig et al. "Development of the Regional Arctic System Model (RASM): near-surface atmospheric climate sensitivity." Journal of Climate 30, no. 15 (2017): 5729-5753. doi: 10.1175/JCLI-D-15-0775.1.