Synoptic Climatological Analysis of Iaea/WMO GNIP Data from Cnada: Possible evidence for ENSO influence on isotope-climate relations

摘要

Observations [1] and climate models [2] suggest that changes in circulation patterns can produce changes in the isotopic composition of precipitation that can be decoupled from surface temperature variability. The GNIP/WMO database was used to look at the interannual variability in the isotopic composition of precipitation at three stations in western Canada: Wynyard, Saskatchewan and The Pas and Gimli, Manitoba. These stations are located at the confluence of the Pacific, Arctic and Tropical air masses. Given their location, it is likely that changes in atmospheric circulation may result in changes in the relative contribution of the three air masses, which may be identified in the isotopic composition of precipitation.