The influence of Large-scale 200 mb tropical divergence events on the midlatitude zonal flow over the Asia-Pacific region during the 1983-84 winter
Boyle, James S.
MetadataShow full item record
Global band analysis grid point data produced by FNOC for the 1983/1984 winter season are used to study the daily variation of the mid-latitude 200 mb zonal wind in relation to the divergence field. It is found that the enhancements of tropical divergence are well correlated with the intensification of the westerly jet in the mid-latitudes. Three cases of the tropical divergence events were associated with tropical storm activities. This association asserts that westerly jet intensification is, in fact, a response to the tropical divergence enhancement, accepting the view that developed tropical storms are tropically-forced systems. A case of tropical divergence enhancement was also found to be attributable to a cold surge, reaffirming the importance of the cold surge related jet acceleration. Further, the study also confirms the downstream propagation of the jet streak; the existence of thermally indirect circulations at the jet exit region of the jet, both in the time-mean and in the transient motion fields.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Application of satellite cloud brightness data for large-scale tropical analysis: A correlation study of brightness and 200-mb divergence Chang, Chih-Pei (Monterey, California. Naval Postgraduate School, 1974 -08); NPS-51Cj74081This is a preliminary analysis of digitized satellite cloud brightness data that will be used in developing a model for large-scale analysis over data-void tropical areas, which is based on Wallace's (1971) postulation that ...
A Diagnostic Model for Estimating Large-Scale Flow Patterns in the Tropical Upper Troposphere from Satellite Cloud Brightness Data Chang, C.-P.; Jacobs, F.T.; Edwards, B.B. (1975-06);A diagnostic model is proposed to use digitized satellite cloud brightness data to estimate objectively the large-scale flow patterns over data-void tropical regions. The model utilizes a linear barotropic vorticity equation ...
An objective technique for estimating large-scale flow pattern in the tropical upper troposphere from digitized cloud brightness data. Jacobs, Frederick T. (Monterey, California. Naval Postgraduate School, 1974);An objective technique is proposed to use digitized satellite cloud brightness data to estimate large-scale flow patterns over data-void tropical regions. It is basically a diagnostic model which assumes: 1) area-averaged cloud ...