Limnological properties of thermokarst lakes in Central Yakutia sampled between 2018-2019

• Main Authors: Hughes-Allen, Lara, Bouchard, Frédéric, Séjourné, Antoine, Gandois, Laure
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Carbon; organic; dissolved; Central_Yakutia_thermokast_lakes; Central Yakutia; Conductivity; specific; Dissolved organic carbon; dissolved oxygen; Lake; Lake type; LATITUDE; limnology; LONGITUDE; Oxygen; permafrost; pH; Sampling lake; Season; Temperature; water; thermokarst lakes; TOC-5000A analyzer; Shimadzu; Japan; Year of observation; YSI Pro DSS multiprobe sensor; Canada; Thermokarst; Yakutia; Siberia
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.919907; https://doi.org/10.1594/PANGAEA.919907

This dataset compiles selected limnological properties of a series of thermokarst (thaw) lakes in Central Yakutia (Eastern Siberia). These properties were measured during fall 2018 (September), winter 2019 (March-April), spring 2019 (May), and summer 2019 (August). These data span four seasons (Fall, Winter, Spring, and Summer) 2018-2019. The lake type designation is based on field observations, past radiocarbon dating of lake sediments, geochemical signatures of lake waters, and a multiple-stage development model of thermokarst lakes. Data were collected at the surface (~ 30 cm depth) from lake shores. Specific conductivity (accuracy ±1% of reading), temperature (accuracy ±0.2°C), dissolved oxygen (accuracy ±1% of reading or 1% saturation) and pH (accuracy ±0.2) were measured using a YSI Pro DSS multiprobe sensor. Water samples were collected to analyze dissolved organic carbon (DOC). Samples were filtered using baked glass fiber filters (Whatman GF/F, 0. 7µm), acidified to pH 2 with ultra-pure HCl and stored in baked glass vials. DOC concentration was measured using a TOC-5000A analyzer (Shimadzu, Japan). The quantification limit was 1 mg L-1. Above this value, the analytical uncertainty was estimated at ±0.1 mg L-1. Reference material included ION-915 ([DOC]= 1.37 ± 0.41mg C L-1) and ION 96.4 ([DOC]= 4.64 ± 0.70 mg C L-1) (Environment and Climate Change Canada, Canada).