Physically Based Global Downscaling: Regional Evaluation

Journal Article · Wed Feb 01 04:00:00 EST 2006 · Journal of Climate, 19(3):429-445

DOI:https://doi.org/10.1175/JCLI3622.1· OSTI ID:881929

Ghan, Steven J; Shippert, Timothy R; Fox, Jared

The climate simulated by a global atmosphere/land model with a physically-based subgrid orography scheme is evaluated in ten selected regions. Climate variables simulated for each of multiple elevation classes within each grid cell are mapped according the high-resolution distribution of surface elevation in each region. Comparison of the simulated annual mean climate with gridded observations leads to the following conclusions. At low to moderate elevations the downscaling scheme correctly simulates increasing precipitation, decreasing temperature, and increasing snow with increasing elevation within regions smaller than 100 km. At high elevations the downscaling scheme correctly simulates a decrease in precipitation with increasing elevation. Too little precipitation is simulated on the windward side of mountain ranges and too much precipitation is simulated on the lee side. The simulated sensitivity of surface air temperature to surface elevation is too strong, particularly in valleys influenced by drainage circulations. Observations show little evidence of a “snow shadow”, so the neglect of the subgrid rainshadow does not produce an unrealistic simulation of the snow distribution. Summertime snow area, which is a proxy for land ice, is much larger than observed. Summertime snow water equivalent is far less than the observed thickness of glaciers because a 1 m upper bound on snow water is applied to the simulations and because snow transport by slides is neglected. The 1 m upper bound on snow water equivalent also causes an underestimate of seasonal snow water during late winter, compared with gridded station measurements. Potential solutions to these problems are discussed.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 881929
• Report Number(s): PNNL-SA-44149; KP1703020
• Journal Information: Journal of Climate, 19(3):429-445, Journal Name: Journal of Climate, 19(3):429-445 Journal Issue: 3 Vol. 19; ISSN JLCLEL; ISSN 0894-8755
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AMBIENT TEMPERATURE
ATMOSPHERIC PRECIPITATIONS
CLIMATE MODELS
CLIMATES
COMPUTERIZED SIMULATION
ENVIRONMENTAL TRANSPORT
GCM
SENSITIVITY
SURFACE AIR
climate model-driven
complex terrain
flows
interpolation
orographic precipitation
resolution
sensitivity
simulations
western United States