Monosaccharide anhydrides (MA) records of Lake El'gygytgyn sediments (MIS 5e, 6, 7e, 8,11c, 12c)

• Main Authors: Dietze, Elisabeth, Karger, Cornelia, Mangelsdorf, Kai
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Age; maximum/old; minimum/young; AWI_Envi; AWI Arctic Land Expedition; Calculated; COMPCORE; Composite Core; Depth; bottom/max; sediment/rock; top/min; ELGYGYTGYN; Elgygytgyn1998; Elgygytgyn crater lake; Sibiria; Russia; Event label; Galactosan per unit sediment mass; ICDP_Elgygytgyn-Drilling-Project; ICDP5011-1; ICDP 5011-1; Lake Elgygytgyn - Climate History of the Arctic since 3.6 Million Years; Levoglucosan/(mannosan+galactosan) ratio; Levoglucosan/mannosan ratio; Levoglucosan per unit sediment mass; Mannosan per unit sediment mass; Marine isotope stage; PG1351; Polar Terrestrial Environmental Systems @ AWI; RU-Land_1998_Elgygytgyn; Sample ID; Sampling on land; Ultra high performance liquid chromatography-high resolution mass spectrometry (U-HPLC-HRMS); Arctic; Crater Lake
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.915603; https://doi.org/10.1594/PANGAEA.915603

We freeze-dried and homogenized 44 samples of c. 0.7-1.8 g dry sediment from core PG1351 covering late glacials and interglacials of MIS 8 to MIS 5e, integrating sediment of 1 cm core depth. Temporal resolution of these samples ranges from 140 to 960 years per sample. For the period between 430 and 405 kyrs ago (end of MIS 12 to MIS 11c), 13 samples of 0.5-1.3 g of dry sediment from ICDP core 5011-1 were taken for MA analyses, integrating sediment of 2 cm core depth. Eight of these 13 samples are from the same core depths as were previously analysed for pollen (Melles et al., 2012). Temporal resolution of these samples varies between 200 and 970 years per sample comparable to core PG1351. Across all samples, temporal resolution is 333 ± 273 years per sample, giving centennial- to millennial scale averages. We extracted the polar lipids of all MA samples using a Dionex Accelerated Solvent Extraction system (ASE 350, ThermoFisher Scientific) at 100°C, 103 bar pressure and two extraction cycles (20 min static time) with 100 % methanol, after an ASE cycle with 100 % dichloromethane. For every sample sequence (n=13-18), we extracted a blank ASE cell and included it in all further steps. We added 60 ng of deuterated levoglucosan (C6H3D7O5; dLVG; Th. Geyer GmbH & Co. KG) as internal standard, and filtered the extract over a PTFE filter using acetonitrile and 5 % HPLC-grade water. We analysed the extracts with an Ultimate 3000 RS ultra-high performance liquid chromatograph (U-HPLC) with thermostated autosampler and column oven coupled to a Q Exactive Plus Orbitrap mass spectrometer (Quadrupole-Orbitrap MS; ThermoFisher Scientific) with heated electrospray injection (HESI) probe at GFZ Potsdam, using measurement conditions adapted from earlier studies (Hopmans et al., 2013;Schreuder et al., 2018;Dietze et al., 2019). Briefly, separation was achieved on two Xbridge BEH amide columns in series (2.1 x 150 mm, 3.5 um particle size) fitted with a 50 mm pre-column of the same material (Waters). The compounds were eluted ...