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A 520 year record of summer sunshine for the eastern European Alps based on stable carbon isotopes in larch tree rings / Polona Hafner; Danny McCarroll; Iain Robertson; Neil J. Loader; Mary Gagen; Giles HF Young; Roderick J. Bale; Eloni Sonninen; Tom Levanič

Climate Dynamics, Volume: 43, Issue: 3-4, Pages: 971 - 980

Swansea University Author: Gagen, Mary

DOI (Published version): 10.1007/s00382-013-1864-z

Abstract

A 520-year stable carbon isotope chronology from tree ring cellulose in high altitude larch trees (Larix decidua Mill.), from the eastern European Alps, correlates more strongly with summer temperature than with summer sunshine hours. However, when instrumental records of temperature and sunshine di...

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Published in: Climate Dynamics
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa23984
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Abstract: A 520-year stable carbon isotope chronology from tree ring cellulose in high altitude larch trees (Larix decidua Mill.), from the eastern European Alps, correlates more strongly with summer temperature than with summer sunshine hours. However, when instrumental records of temperature and sunshine diverge after AD 1980, the tree ring time series does not follow warming summer temperatures but more closely tracks summer sunshine trends. It is concluded that sunshine is the dominant control on carbon isotope fractionation in these trees, via the influence of photosynthetic rate on the internal partial pressure of CO2, and that high summer (July-August) sunshine hours is a suitable target for climate reconstruction. We thus present the first reconstruction of summer sunshine for the eastern Alps and compare it with the regional temperature evolution.
Keywords: Carbon isotopes; dendrochronology; climate change; cloud cover
College: College of Science
Issue: 3-4
Start Page: 971
End Page: 980