Monday, 10 January 2005
Surface pressure trends in the canadian arctic during 1953–2003
Hourly values of surface pressure recorded at several dozen stations located in the Canadian Arctic (above 60o N latitude) during 1953-2003 were examined. For each station, a linear trend was fitted to the data and a statistical t test determined whether the trend was significant at the 5% level. A significant decrease in winter pressure averaging -5.8 hPa was found for most of the stations. Fewer and weaker statistically significant trends were found in the other seasons. In addition, very few stations in southern Canada had significant trends in any season. This appears to be a manifestation of the so called Arctic oscillation.