20-EPN2-046: Dust-carbon-climate feedbacks tested through detailed independent dating of Arctic wind-blown dust sequences on Greenland.
Visit by Thomas Stevens, Uppsala University (Sweden) to TA1.4 AU Greenland Kangerlussuaq Field Site (Greenland).
Dates of visit: 19-25 July 2021
Report Summary: The aim of this field campaign was to investigate the dynamics of aeolian mineral dust activity and organic carbon burial in western Greenland. Dust is an important component of the global climate system, and investigating its mobilisation, transport and deposition can reveal important information about regional climate and environmental development during the Holocene. Carbon burial in permafrost is one of the main mechanisms by which carbon is sequestered from the atmosphere, and may be linked to dust activity in high latitudes. The work focused on the area between the Greenland Ice Sheet margin and Kangerlussuaq, which represents a range of environmental conditions depending on distance from the ice sheet. We collected modern analogue samples of terrestrial windblown dust (loess) deposits to test and compare the performance of optically stimulated luminescence and radiocarbon dating. These samples were taken at a high-resolution from the surface of the deposits and thus represent recent aeolian activity. Furthermore, we targeted aeolian deposits containing palaeosol layers to be able to independently compare radiocarbon and luminescence ages, and to identify climate phases which were favourable for soil formation and carbon burial. In addition to purely aeolian sediments, peat bogs were also sampled.
These highly organic deposits complement the nearly purely minerogenic loess deposits because they effectively capture and preserve fine-grained wind-blown sediments. Further analysis of these samples and the use of different climate and carbon burial proxies will reveal important details of the regional climate history, dust-carbon burial dynamics, and provide insights into ice-proximal wind dynamics.
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