Radionuclides measured on 37 water bottle profiles during POLARSTERN cruise ARK-XXII/2 ...

• Main Authors: Cai, Pinghe, Rutgers van der Loeff, Michiel M, Stimac, Ingrid, Nöthig, Eva-Maria, Lepore, Kate, Moran, S Bradley
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; DEPTH, water; Salinity; Uranium-238; Uranium-238, standard deviation; Thorium-234, total; Thorium-234, total, standard deviation; Thorium-234/Uranium-238 activity ratio; Thorium-234/Uranium-238 activity ratio, standard deviation; CTD/Rosette, ultra clean; CTD/Rosette; CTD; see further details; ARK-XXII/2; Polarstern; Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES; Marine Geochemistry @ AWI AWI_MarGeoChem; Arctic; Arctic Ocean; Barents Sea; Kara Sea; Laptev Sea; The Ark; laptev; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.708354; https://doi.pangaea.de/10.1594/PANGAEA.708354

The loss of Arctic sea ice has accelerated in recent years. With the decline in sea ice cover, the Arctic Ocean biogeochemistry is undergoing unprecedented change. A key question about the changing Arctic Ocean biogeochemistry is concerning the impact of the shrinking sea ice cover on the particulate organic carbon (POC) export from the upper Arctic Ocean. Thus far, there are still very few direct measurements of POC export in the permanently ice-covered central Arctic Ocean. A further issue is that the magnitude of the POC export so far documented in this region remains controversial. During the ARK-XXII/2 expedition to the Arctic Ocean from 28 July to 7 October in 2007, we conducted a high-resolution study of POC export using 234Th/238U disequilibrium. Depth profiles of total 234Th in the upper 200 m were collected at 36 stations in the central Arctic Ocean and its adjacent seas, i.e., the Barents Sea, the Kara Sea and the Laptev Sea. Samples were processed using a small-volume MnO2 coprecipitation method ... : Volume sampled: 4 L of seawater ...