Greenland records of aerosol source and atmospheric lifetime changes from the Eemian to the Holocene

Schüpbach, Simon; Fischer, Hubertus; Bigler, M.; Erhardt, Tobias; Gfeller, Gideon; Leuenberger, Daiana; Mini, Olivia; Mulvaney, R.; Abram, N. J.; Fleet, L.; Frey, M. M.; Thomas, E.; Svensson, A.; Dahl-Jensen, D.; Kettner, E.; Kjaer, H.; Seierstad, I.; Steffensen, J. P.; Rasmussen, S. O.; Vallelonga, P.; ... (2018). Greenland records of aerosol source and atmospheric lifetime changes from the Eemian to the Holocene. Nature communications, 9(1) Nature Publishing Group 10.1038/s41467-018-03924-3

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The Northern Hemisphere experienced dramatic changes during the last glacial, featuring vast ice sheets and abrupt climate events, while high northern latitudes during the last interglacial (Eemian) were warmer than today. Here we use high-resolution aerosol records from the Greenland NEEM ice core to reconstruct the environmental alterations in aerosol source regions accompanying these changes. Separating source and transport effects, we find strongly reduced terrestrial biogenic emissions during glacial times reflecting net loss of vegetated area in North America. Rapid climate changes during the glacial have little effect on terrestrial biogenic aerosol emissions. A strong increase in terrestrial dust emissions during the coldest intervals indicates higher aridity and dust storm activity in East Asian deserts. Glacial sea salt aerosol emissions in the North Atlantic region increase only moderately (50%), likely due to sea ice expansion. Lower aerosol concentrations in Eemian ice compared to the Holocene are mainly due to shortened atmospheric residence time, while emissions changed little.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Schüpbach, Simon; Fischer, Hubertus; Erhardt, Tobias; Gfeller, Gideon; Leuenberger, Daiana; Mini, Olivia and Adolphi, Florian

Subjects:

500 Science > 530 Physics

ISSN:

2041-1723

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

08 May 2018 10:05

Last Modified:

19 Jul 2018 11:49

Publisher DOI:

10.1038/s41467-018-03924-3

BORIS DOI:

10.7892/boris.116221

URI:

https://boris.unibe.ch/id/eprint/116221

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