Glacio-chemical study spanning the past 2 kyr on three ice cores from Dronning Maud Land, Antarctica: 2. Seasonally resolved chemical records ...

• Main Authors: Sommer, S., Wagenbach, D., Mulvaney, R., Fischer, Hubertus
• Format: Article in Journal/Newspaper
• Language: English
• Published: University of Bern 2000
• Subjects: East Antarctica; Dronning Maud Land; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.48350/158735; https://boris-portal.unibe.ch/handle/20.500.12422/43348

The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals of chemical trace species could be obtained from the interior of central Antarctica over a period of approximately 2 millennia. Although the elevation as well as the accumulation rate differ between the drilling sites, similar values were obtained by comparing mean concentrations spanning the last 900 years. However, a distinct lack of intersite correlation was found on decadal timescales. Despite a noticeable accumulation change, apparent in one core, no significant concentration change of all three species has occurred. All the measured ions show clear seasonal signals over the whole records. While the sea-salt-related component sodium peaks simultaneously with calcium, the maximum ammonium concentration occurs ...