Kinetic Energy in the Northern Hemisphere during the FGGE (First GARP Global Experiment) Year.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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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