Simulation of stationary and transient geopotential-height eddies in January and July with a spectral general circulation model

Journal Article · Sun Apr 15 04:00:00 EST 1984 · J. Atmos. Sci.; (United States)

DOI:https://doi.org/10.1175/1520-0469(1984)041<1394:TSOSAT>2.0.CO;2· OSTI ID:6804414

Malone, R C; Pitcher, E J; Blackmon, M L; Puri, K; Bourke, W

We examine the characteristics of stationary and transient eddies in the geopotential-height field as simulated by a spectral general circulation model. The model possessess a realistic, but smootheed, topography. Two simulations with perpetual January and July forcing by climatological sea surface temperatures, sea ice, and insolation were extended to 1200 days, of which the final 600 days were used for the results in this study. We find that the stationary waves are well simulated in both seasons in the Northern Hemisphere, where strong forcing by orography and land-sea thermal contrast exists. However, in the Southern Hemisphere, where no continents are present in midlatitudes, the stationary waves have smaller amplitude than that observed in both seasons. In both hemispheres, the transient eddies are well simulated in the winter season but are too weak in the summer season. The model fails to generate a sufficiently intense summertime midlatitude jet in either hemisphere, and this results in a low level of transient activity. The variance in the tropical troposphere is very well simulated. We examine the geographical distribution and vertical structure of the transient eddies. Fourier analysis in zonal wavenumber and temporal filtering are used to display the wavelength and frequency characteristics of the eddies.

• Research Organization: Institute for Geophysical and Planetary Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 6804414
• Journal Information: J. Atmos. Sci.; (United States), Journal Name: J. Atmos. Sci.; (United States) Vol. 41:8; ISSN JAHSA
• Country of Publication: United States
• Language: English

Related Subjects

500100* -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CIRCULATION
BOUNDARY CONDITIONS
CLIMATES
FLUID FLOW
FOURIER ANALYSIS
SIMULATION
TRANSIENTS
VORTEX FLOW