Publication Date:
2023-05-15
Description:
The relationship between d18O 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 d18O was found, but the quality of the d18O-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 d18O-T relationship. For trajectories that lead completely above open water, no significant correlation between d18O 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.
Keywords:
AWI_Glac; Calculated; DATE/TIME; Deuterium excess; Dronning Maud Land, Antarctica; Glaciology @ AWI; Neumayer; Neumayer_based; NEUMAYER III; Research station; RS; Temperature, air; WMO89002; δ18O, water; δ Deuterium
Type:
Dataset
Format:
text/tab-separated-values, 1342 data points
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