The TRANSDRIFT I expedition was part of the joint Russian-German cooperation and the Laptev Sea System project. The Arctic and Antarctic Research Institute (AARI) in St. Petersburg and the GEOMAR Research Center for Marine Geosciences were jointly responsible for the organization and coordination of the TRANSDRIFT I expedition, which was funded by the Russian Ministry for Research and Technology and the German Ministry for Research and Technology.The TRANSDRIFT I expedition was carried out aboard the Russian RV IVAN KIREYEV and a multi-disciplinary meteorological, oceanographical, chemical, biological and geological working program was carried out in bilateral cooperation. CTD data were retrieved at a total number of 133 stations. Hydrochemical sampling with oxygen, silicate and phosphate analysis was carries out at 87, 84 and 16 of these stations, respectively.