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. Lakes act as important sinks for inorganic and organic sediment components.However, investigations of sedimentary carbon budgets within glacial lakesare currently absent from Arctic Siberia. The aim of this paper is toprovide the first reconstruction of accumulation rates, sediment and carbonbudgets from a lacustrine sediment core from Lake Rauchuagytgyn, Chukotka(Arctic Siberia). We combined multiple sediment biogeochemical andsedimentological parameters from a radiocarbon-dated 6.5 m sediment corewith lake basin hydroacoustic data to derive sediment stratigraphy, sedimentvolumes and infill budgets. Our results distinguished three principalsediment and carbon accumulation regimes that could be identified across allmeasured environmental proxies including early Marine Isotope Stage 2 (MIS2) (ca. 29–23.4 ka cal BP), mid-MIS2–early MIS1 (ca. 23.4–11.69 ka cal BP) and the Holocene (ca. 11.69–present). Estimated organic carbon accumulation rates (OCARs) werehigher within Holocene sediments (average 3.53 g OC m−2 a−1) thanPleistocene sediments (average 1.08 g OC m−2 a−1) and are similarto those calculated for boreal lakes from Quebec and Finland and Lake Baikalbut significantly lower than Siberian thermokarst lakes and Alberta glaciallakes. Using a bootstrapping approach, we estimated the total organic carbonpool to be 0.26 ± 0.02 Mt and a total sediment pool of 25.7 ± 1.71 Mt within a hydroacoustically derived sediment volume of ca. 32 990 557 m3. The total organic carbon pool is substantially smaller than Alaskanyedoma, thermokarst lake sediments and Alberta glacial lakes but sharessimilarities with Finnish boreal lakes. Temporal variability in sediment andcarbon accumulation dynamics at Lake Rauchuagytgyn is controlledpredominantly by palaeoclimate variation that regulates lake ice-coverdynamics and catchment glacial, fluvial and permafrost processes throughtime. These processes, in turn, affect catchment and within-lake primaryproductivity as well as catchment soil development. Spatial differences compared toother lake systems at a trans-regional scale likely relate to thehigh-latitude, mountainous location of Lake Rauchuagytgyn.

biogeosciences

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses