Assessment of trends in surface and upper air temperatures at various locations in Canada

Recent studies of the Canadian climate have indicated significant changes in the observed surface temperature during the past five decades. A strong warming is identified in the western part of Canada while cooling occurs in the north-eastern part of the country, particularly during winter and spring. It is pertinent to determine if related trends also occur in upper levels of the atmosphere. This work presents a preliminary analysis of the trends and variability in temperature at the surface and various standard upper air pressure levels at several locations in Canada.