Development of the Regional Arctic System Model (RASM): near-surface atmospheric climate sensitivity
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Authors
Cassano, John J.
DuVivier, Alice
Roberts, Andrew
Hughes, Mimi
Seefeldt, Mark
Brunke, Michael
Craig, Anthony
Fisel, Brandon
Gutowski, William
Hamman, Joseph
Subjects
Advisors
Date of Issue
2017-08-01
Date
Publisher
American Meteorological Society (AMS)
Language
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.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1175/JCLI-D-15-0775.1
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
U.S. Department of Energy (DOE)
National Science Foundation (NSF)
National Science Foundation (NSF)
Funding
Grant DE-FG02-07ER64460 (DOE)
Grant DE--FG02-07ER64463 (DOE)
Grant DE-SC0006178 (DOE)
Grant PLR-1107788 (NSF)
Grant DE-SC0006693 (DOE)
Grant DE-FG02-07ER64462 (DOE)
Grant DE-SC0006856 (DOE)
Grant PLR-1417818 (NSF)
Grant DE--FG02-07ER64463 (DOE)
Grant DE-SC0006178 (DOE)
Grant PLR-1107788 (NSF)
Grant DE-SC0006693 (DOE)
Grant DE-FG02-07ER64462 (DOE)
Grant DE-SC0006856 (DOE)
Grant PLR-1417818 (NSF)
Format
25 p.
Citation
J.J. Cassano, et al, "Development of the Regional Arctic System Model (RASM): near surface atmospheric climate sensitivity," Journal of Climate, v. 30 (1 August 2017), pp. 5729-5753.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.