Accession Number : AD0634095

Title :   AIRMASSES, STREAMLINES, AND THE BOREAL FOREST. APPENDIX: NON-LINEAR PARAMETER ESTIMATION FOR THE PARTIAL COLLECTIVE MODEL OF AIRMASS ANALYSIS.

Descriptive Note : Technical rept.,

Corporate Author : WISCONSIN UNIV MADISON DEPT OF METEOROLOGY

Personal Author(s) : Bryson,Reid A. ; Johnson,Donald R.

Report Date : FEB 1966

Pagination or Media Count : 81

Abstract : The July airmass frequency distribution over Canada is analyzed by daily computation of trajectories from grid intersections back to source regions. A zone of rapid transition from Arctic Air dominance to Pacific Air dominance is found to lie along the northern border of the boreal forest, suggesting that the summer airmass distribution might be an important causal factor for the distribution of forest versus tundra. An independent analysis of July airmass frequency distribution by resolution of the daily maximum temperature frequency distribution into partial collectives (component normal distributions) yields results very similar to the trajectory analysis but with more detail. This analysis suggests that airmass dominance might be of importance to other biotic regions as well as the boreal forest and tundra. A final analysis using monthly resultant wind streamlines near the surface indicates that mean airstreams and confluences between airstreams define climatic regions with a distinctive annual march of airstream (and in the mean, airmass) dominance. These regions show a clear congruence with several major biotic regions. These analyses strongly suggest that the boreal forest occupies the region between the mean (or modal) southern boundary of Arctic Air in winter and the mean southern boundary of Arctic Air in summer. (Author)

Descriptors :   (*CLIMATE, *ECOLOGY), (*AIR MASS ANALYSIS, CLIMATE), GEOGRAPHY, CANADA, PLANTS(BOTANY), METEOROLOGICAL PHENOMENA, CORRELATION TECHNIQUES, ARCTIC REGIONS

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE