The influence of precipitation origin on the 18O–T relationship at Neumayer station, Ekströmisen, Antarctica
Abstract:The relationship between 18O and air temperature at Neumayer station, Ekströmisen, Antarctica, was investigated using fresh-snow samples from the time period 1981–2000. A trajectory model that calculated 5 day-backward trajectories was used to study the influence of different synoptic weather situations and thus of different moisture sources on this correlation. Generally a high correlation between air temperature and 18O was found, but the quality of the 18O–T relationship varied with the different trajectory classes. Additionally, the sea-ice coverage on the travel path of the moist air was considered. The amount of open ocean water underneath the trajectory has a large influence on the 18O–T relationship. For trajectories that lead completely above open water, no significant correlation between 18O and T was found, because mixing with air masses containing additionally evaporated water vapour from the ocean influences the isotope ratio of precipitation. A very high correlation, however, was found for transports over the completely ice-covered Weddell Sea.
Document Type: Research Article
Publication date: June 1, 2004
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