DML as well as data of the control standard IA-RO63. It can be seen that the SD of the DML house standard is higher, but it is still within the specification of the analysis system. The transparent background [...] addition, the δ 15 N values of the organic matter also provide information on the efficiency of the biological pump if terrigenous input can be excluded. The δ 13 C and δ 15 N values of organisms, on the other [...] archives. On the other hand, we determine the δ 18 O values in ice and water samples from the Arctic and Antarctic, as well as the δ 13 C values of dissolved inorganic carbon in the water of the polar oceans