Kinetic Energy in the Northern Hemisphere during the FGGE (First GARP Global Experiment) Year.
Abstract
Northern Hemisphere kinetic energy during the FGGE year is calculated on twice daily basis at 0000 GMT and 1200 GMT. Graphs of time series of total (K), zonal (K sub Z) and eddy (K sub E) kinetics energy exhibit a strong annual cycle with superimposed short term fluctuations of about 14 to 16 days in K and K sub E. This is confirmed by spectral analysis. Division of K sub E into standing and transient components by month shows good agreement with values from Peixoto and Oort (1974) for standing K sub E but poorer agreement for transient K sub E. A large portion of the difference is probably due to interpolation methods. Standing and transient K sub E by month and latitude show standing maxima associated with persistent trough and ridge features, mean jet stream and summer monsoon. A single transient maximum located about 5 to 10 deg north of the jet related standing maximum appears associated with cyclone activity. Geographical plots of grid point K showed Asian and North American east coast winter maxima near equal intensity. Lower than average North American temperatures enhanced baroclinicity, contributing to the stronger than average maximum. Spring reveals a collapsed North American maximum, and the signature of the Indian monsoon appears prominent in summer. Available potential energy (A) quantities form Min and Horn (1982) allow K to A ratios to be compared with those of Peixoto and Oort (1974). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1983
- Accession Number
- ADA135382
Entities
People
- J. H. Zautner
Organizations
- Air Force Institute of Technology