Chlorofluorocarbons, helium, and neon measured on water bottle samples during POLARSTERN cruise ANT-XXII/2 (ISPOL) ...

• Main Authors: Huhn, Oliver, Hellmer, Hartmut H, Rhein, Monika, Roether, Wolfgang, Rodehacke, Christian, Schodlok, Michael P, Schröder, Michael
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2008
• Subjects: CTD from ice float; CTD/Rosette; Ice station; ANT-XXII/2; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Filchner Ronne Ice Shelf; Filchner-Ronne Ice Shelf; Ice Shelf; Larsen Ice Shelf; Ronne Ice Shelf; Sea ice; Weddell Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.729117; https://doi.pangaea.de/10.1594/PANGAEA.729117

During Ice Station POLarstern (ISPOL; R.V. Polarstern cruise ANT XXII/2, November 2004-January 2005), hydrographic and tracer observations were obtained in the western Weddell Sea while drifting closely in front of the Larsen Ice Shelf. These observations indicate recently formed Weddell Sea Bottom Water, which contains significant contributions of glacial melt water in its upper part, and High-Salinity Shelf Water in its lower layer. The formation of this bottom water cannot be related to the known sources in the south, the Filchner-Ronne Ice Shelf. We show that this bottom water is formed in the western Weddell Sea, most likely in interaction with the Larsen C Ice Shelf. By applying an Optimum Multiparameter Analysis (OMP) using temperature, salinity, and noble gas observations (helium isotopes and neon), we obtained mean glacial melt-water fractions of about 0.1% in the bottom water. On sections across the Weddell Gyre farther north, melt-water fractions are still on the order of 0.04%. Using ... : See doi:10.1594/PANGAEA.729699 for the physical oceanography. ...