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Warm Mediterranean mid-Holocene summers inferred from fossil midge assemblages

Samartin, Stephanie and Heiri, Oliver and Joos, Fortunat and Renssen, Hans and Franke, Jorg and Bronnimann, Stefan and Tinner, Willy. (2017) Warm Mediterranean mid-Holocene summers inferred from fossil midge assemblages. Nature Geoscience, 10 (3). 207-+.

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Official URL: https://edoc.unibas.ch/67692/

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Abstract

Understanding past climate trends is key for reliable projections of global warming and associated risks and hazards. Uncomfortably large discrepancies between vegetation-based summer temperature reconstructions (mainly based on pollen) and climate model results have been reported for the current interglacial, the Holocene. For the Mediterranean region these reconstructions indicate cooler-than-present mid-Holocene summers, in contrast with expectations based on climate models and long-term changes in summer insolation. We present new quantitative and replicated Holocene summer temperature reconstructions based on fossil chironomid midges from the northern central Mediterranean region. The Holocene thermal maximum is reconstructed 9,000-5,000 years ago and estimated to have been 1-2 degrees C warmer in mean July temperature than the recent pre-industrial period, consistent with glacier and marine records, and with transient climate model runs. This combined evidence implies that widely used pollen-based summer temperature reconstructions in the Mediterranean area are significantly biased by precipitation or other forcings such as early land use. Our interpretation can resolve the previous discrepancy between climate models and quantitative palaeotemperature records for millennial-scale Holocene summer temperature trends in the Mediterranean region. It also suggests that pollen-based evidence for cool mid-Holocene summers in other semi-arid to arid regions of the Northern Hemisphere may have to be reconsidered, with potential implications for global-scale reconstructions.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Natur- Landschafts- und Umweltschutz > Geoökologie (Heiri)
UniBasel Contributors:Heiri, Oliver
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:NATURE PUBLISHING GROUP
ISSN:1752-0894
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:26 Feb 2019 17:17
Deposited On:26 Feb 2019 17:17

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