Development of the Regional Arctic Climate System Model (RACM) ---
description
Transcript of Development of the Regional Arctic Climate System Model (RACM) ---
Development of the Regional Arctic Climate System Model (RACM) ---
Department of Civil and Environmental Engineering University of Washington
May, 2010
Performance of the VIC land surface model in coupled and uncoupled simulations
Current Status
• The macroscale hydrology model VIC has been successfully coupled with WRF through CCSM4 flux coupler CPL7.
• WRF/VIC successfully runs more than 6 months over Arctic in wr50a grid with ocean and sea ice as a data model.
• Currently WRF/VIC is basically ready for long-time (multi-year) simulation since VIC has restart function and also is able to produce its own output.
SimultationsWRF-VIC : WRF/VIC coupled simulation over the
Arctic region in the wr50a grid (Jan. – Jun. 2003) with ocean and sea ice conditions prescribed (“data model”). Initial and boundary conditions are from FNL.
VIC-obs: VIC Offline Simulations of the Arctic domain (1990-2003) at 50km resolution driven by meteorological observation (provided by Xiaogang Shi).
WRF-noah: Original WRF simulation (by Joan Cassano’s group over wr50a grid driven by NCEP-2 reanalysis data(Sep. 2000 - ).
WRF2: Original WRF simulation (by JuanXiong He ) over wr50a grid driven by FNL (Jan. 1 - 15 2003 ).
SST
Modeling FrameworkArctic Domain wr50a resolution
runs: Jan. – June. 2003
Configuration WV (WRF/VIC)
Features specific to Cold-Land Processes:
• Two-layer energy balance snow model (Storck et al. 1999)
• Frozen soil/permafrost
algorithm (Cherkauer et al. 1999, 2003)
• Lakes and wetlands model (Bowling et al.
2004)
•Blowing snow algorithm (Bowling et
al. 2004)
Validation of coupled WRF/VIC modeling systemWRF/VIC
JFM 2003
AMJ 2003
Observation
WRF/VIC produces drier climate especially over Russia, Finland, Sweden and Norway.
Validation of coupled WRF/VIC modeling systemWRF/VIC Observation
JFM 2003
AMJ 2003
WRF/VIC basically captures temperature
pattern but has significantly cold bias
over Russia.