Universität zu Köln

Dietze, Elisabeth ORCID: 0000-0003-4817-8441, Mangelsdorf, Kai, Andreev, Andrei ORCID: 0000-0002-8745-9636, Karger, Cornelia, Schreuder, Laura T., Hopmans, Ellen C., Rach, Oliver, Sachse, Dirk ORCID: 0000-0003-4207-0309, Wennrich, Volker ORCID: 0000-0003-3617-1963 and Herzschuh, Ulrike ORCID: 0000-0003-0999-1261 (2020). Relationships between low-temperature fires, climate and vegetation during three late glacials and interglacials of the last 430 kyr in northeastern Siberia reconstructed from monosaccharide anhydrides in Lake El'gygytgyn sediments. Clim. Past., 16 (2). S. 799 - 819. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1814-9332

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Abstract

Landscapes in high northern latitudes are assumed to be highly sensitive to future global change, but the rates and long-term trajectories of changes are rather uncertain. In the boreal zone, fires are an important factor in climate-vegetation interactions and biogeochemical cycles. Fire regimes are characterized by small, frequent, low-intensity fires within summergreen boreal forests dominated by larch, whereas evergreen boreal forests dominated by spruce and pine burn large areas less frequently but at higher intensities. Here, we explore the potential of the monosaccharide anhydrides (MA) levoglucosan, mannosan and galactosan to serve as proxies of low-intensity biomass burning in glacial-to-interglacial lake sediments from the high northern latitudes. We use sediments from Lake El'gygytgyn (cores PG 1351 and ICDP 5011-1), located in the far north-east of Russia, and study glacial and interglacial samples of the last 430?kyr (marine isotope stages 5e, 6, 7e, 8, 11c and 12) that had different climate and biome configurations. Combined with pollen and non-pollen palynomorph records from the same samples, we assess how far the modern relationships between fire, climate and vegetation persisted during the past, on orbital to centennial timescales. We find that MAs attached to particulates were well-preserved in up to 430 kyr old sediments with higher influxes from low-intensity biomass burning in interglacials compared to glacials. MA influxes significantly increase when summergreen boreal forest spreads closer to the lake, whereas they decrease when tundra-steppe environments and, especially, Sphagnum peatlands spread. This suggests that low-temperature fires are a typical characteristic of Siberian larch forests also on long timescales. The results also suggest that low-intensity fires would be reduced by vegetation shifts towards very dry environments due to reduced biomass availability, as well as by shifts towards peatlands, which limits fuel dryness. In addition, we observed very low MA ratios, which we interpret as high contributions of galactosan and mannosan from biomass sources other than those currently monitored, such as the moss-lichen mats in the understorey of the summergreen boreal forest. Overall, sedimentary MAs can provide a powerful proxy for fire regime reconstructions and extend our knowledge of long-term natural fire-climate-vegetation feedbacks in the high northern latitudes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dietze, Elisabeth UNSPECIFIED orcid.org/0000-0003-4817-8441 UNSPECIFIED Mangelsdorf, Kai UNSPECIFIED UNSPECIFIED UNSPECIFIED Andreev, Andrei UNSPECIFIED orcid.org/0000-0002-8745-9636 UNSPECIFIED Karger, Cornelia UNSPECIFIED UNSPECIFIED UNSPECIFIED Schreuder, Laura T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hopmans, Ellen C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rach, Oliver UNSPECIFIED UNSPECIFIED UNSPECIFIED Sachse, Dirk UNSPECIFIED orcid.org/0000-0003-4207-0309 UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Herzschuh, Ulrike UNSPECIFIED orcid.org/0000-0003-0999-1261 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-336153
DOI:	10.5194/cp-16-799-2020
Journal or Publication Title:	Clim. Past.
Volume:	16
Number:	2
Page Range:	S. 799 - 819
Date:	2020
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1814-9332
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MOLECULAR TRACERS; ORGANIC AEROSOLS; EMISSION FACTORS; CARBONACEOUS AEROSOLS; POLLEN RECORD; CORE PG1351; BIOMASS; HOLOCENE; LEVOGLUCOSAN; CHARCOAL Multiple languages Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33615