Geochemical data for SOB14-A-21, a Lena Delta 1st terrace exposure

• Main Authors: Fuchs, Matthias, Strauss, Jens, Grosse, Guido
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: Arctic Delta; AWI_Perma; AWI Arctic Land Expedition; Carbon; organic; total; Carbon/Nitrogen ratio; Carbon and nitrogen and sulfur (CNS) isotope element analyzer; Elementar; Vario EL III; DATE/TIME; Density; dry bulk; wet bulk; Depth; bottom/max; sediment/rock; top/min; Description; EXPO; Exposure; Ice content; gravimetric; volumetric; LATITUDE; Lena_Delta_Sobo-Byk_2014; Lena Delta; LONGITUDE; Nitrogen; permafrost; Permafrost Research; PETA-CARB; PG-SOB14-A-21; Rapid Permafrost Thaw in a Warming Arctic and Impacts on the Soil Organic Carbon Pool; RU-Land_2014_Lena_Sobo-Byk; Sample; dry mass; wet mass; Sample code/label; Sample comment; Sample thickness; Sample volume; Arctic; Peta; Byk; Ice; lena delta
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.967485; https://doi.org/10.1594/PANGAEA.967485

The Holocene delta deposit (1st terrace) exposure SOB14-A-21 (72.53671°N, 127.98945°E) was sampled on 17 August 2014 North of Sobo-Sise Island in the Lena Delta during the framework of the joint Russian-German Expedition LENA 2014. The surface (top) of the exposure was characterized by mosses and sedges. The exposure itself was predominately sandy with few organic remnants. The top organic layer is thin (1.5 cm) and the active layer depth could not be determined exactly. However, the top 170 cm of the exposure were unfrozen although the thaw front might not only be from the top down but also horizontally due to the nature of the exposure. The exposure was first cleaned with a spade and then sampled with a knife and a hole saw from top to bottom. The entire exposure had a depth of 605 cm whereof the bottom 35 cm consisted of ice. Every 25 cm a sample was collected resulting in 22 samples (20 sediment samples and 2 ice samples). The samples were kept cool during the transport and later analyzed in the laboratory for bulk density, total organic carbon, and total nitrogen with a Vario EL III Elemental Analyzer. Prior to analysis, samples were freeze-dried, homogenized, and ground before measuring the samples with the elemental analyzer. The ice samples were not analyzed.