No description available.

Ongoing research designed to expand a grid of tree-ring chronologies in the western U.S. that can be used to examine tree growth response to increasing atmospheric CO2 is summarized in this interim report. Current and projected sampling is designed to cover most of the Great Basin and the Southwestern U.S., focusing on long -lived species growing under stressful climatic conditions. Older trees growing in these circumstances provide the best potential for analytical discrimination of climatic and CO2 signals. A descriptive statistical summary of all current data sets is provided and potential directions of the project are discussed.

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No description available.

No description available.

A knowledge of the basic atmospheric parameters and their variability is required both for climatological purposes and theoretical studies. Meteorologists generally use constant pressure maps at a number of levels to study the broad scale structure of the atmosphere. Vertical cross sections are then used to provide a finer structure and also to permit a vertical integration of the various constant pressure levels. Research meteorologists at McGill have analysed hemispheric weather maps and meridional cross sections along 80oW on a daily basis for a three year period to determine major parameters in the general circulation. This study attempts to provide a useful contribution with respect to mean monthly and seasonal cross section parameters. [...]

p. 3 missing from manuscript. / A continuous display on facsimile of current radar precipitation maps at six heights with greyscale representation of seven levels of precipitation intensity went into operation on June 1 1963, in the Forecast Office at Montreal Airport. Each map portrayed, on a scale of 50 mi/in, the precipitation in an area 260 miles by 224 miles centered on the radar. For each height a pair of maps emerged simultaneously, the left map displaying intensity levels 1, 3, 5 and 7, and the right map levels 2, 4 and 6. [...]

A jet madel of cumulus is studied assuming steadystate conditions and horizontally uniform cross-sections of cloud and environment. Numerical solutions, assuming an entrainment rate inversely proportional to cloud radius, show that for a given ambient lapse rate the cloud thickness depends mainly on (i) mass flux at cloud base and (ii) relative humidity in lower levels. [...]

p. 2 (Abstract) missing from manuscript. / [...] None of the above approaches considered the heat capacity of the stone which for large hail can be quite high, and may aid in keeping the particle temperature below 0 C. It is one purpose of this thesis to investigate this effect. [...]

Meteorologists working in numerical weather prediction are faced with two distinct types of problems. The first problem is to devise a mathematical model which will represent the significant physical processes that occur in the atmosphere. The second problem is to integrate the model equations by applying numerical techniques over a grid network ot discrete points. [...]