Fieldwork on Lake Nylandssjön, Sweden, 22 March 2022
Jules Millet and Anja Studer from the Biogeochemistry group went to visit their collaborators Christian Bigler and Johan Rydberg at Umeå University, Sweden, during March 2022. Together, they went field sampling on Lake Nylandssjön, which is a small, dimictic, mesotrophic lake in Northern Sweden. They collected water and plankton samples through the ice, but most importantly, they retrieved sediment cores from the lake bottom. Since about 100 years, the sediment of Lake Nylandssjön preserves varves of excellent quality, which can be subsampled at an annual resolution when retrieved by freeze-coring. The Lake Nylandssjön sediments will allow us to study diagenetic alteration of organic nitrogen contained within diatom frustules on decadal timescales.