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Dissolved organic matter in the deep TALDICE ice core: A nano-UPLC-nano-ESI-HRMS method

November 18, 2019

Trace organic compounds in deep ice cores supply important paleoclimatic information. Untargeted analyses of dissolved organic matter provide an overview of molecular species in ice samples however, sample volumes usually required for these analyses are generally not available from deep ice cores. Here, we developed an analytical method using a nano-UPLC-nano-ESI-HRMS to detect major molecular species in ice cores. Samples (4 µL) from the TALos Dome Ice CorE (TALDICE), allowed investigating molecular species across a range of depths including during glacial and interglacial periods. We detected 317 chemical species that were tentatively assigned to fatty acids, hydroxy fatty acids and their degradation products (oxo-fatty acids and dicarboxylic acids), as well as oxidation byproducts of isoprene and monoterpenes. These compounds indicate that the main sources of the organic fraction are microbes as well as primary and secondary aerosols. Interglacial samples encompass a wide range of species including compounds from the oxidation of isoprene and monoterpenes as well as unsaturated fatty acids, while the glacial samples contained less diverse species. This difference may be due to decreased temperatures during the glacial period inhibiting terrestrial vegetation growth and increasing the sea ice extent, thereby weakening the emission sources.

Publication Year 2019
Title Dissolved organic matter in the deep TALDICE ice core: A nano-UPLC-nano-ESI-HRMS method
DOI 10.1016/j.scitotenv.2019.134432
Authors Roberta Zangrando, Veronica Zanella, Ornela Karroca, Elena Barbaro, Natalie Kehrwald, Dario Battistel, Andrea Gambaro, Carlo Barbante
Publication Type Article
Publication Subtype Journal Article
Series Title Science of the Total Environment
Index ID 70206688
Record Source USGS Publications Warehouse
USGS Organization Geosciences and Environmental Change Science Center