Signal strength and climate calibration of a European tree-ring isotope network

Details Signal strength and climate calibration of a European tree-ring isotope network Signal strength and climate calibration of a European tree-ring isotope network

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3424302t&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 24, CiteID L24302

Mathematics

Logic

10

Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Biogeosciences: Plant Ecology (1851)

Scientific paper

We present the first European network of tree ring δ 13C and δ 18O, containing 23 sites from Finland to Morocco. Common climate signals are found over broad climatic-ecological ranges. In temperate regions we find positive correlations with summer maximum temperatures and negative correlations with summer precipitation and Palmer Drought Severity Indices (PDSI) with no obvious species-specific differences. Regional δ 13C and δ 18O chronologies share high common variance in year-to-year variations. Long-term variations, however, exhibit differences that may reflect spatial variability in environmental forcings, age trends and/or plant physiological responses to increasing atmospheric CO2 concentration. Rotated principal component analysis (RPCA) and climate field correlations enable the identification of four sub-regions in the δ 18O network - northern and eastern Central Europe, Scandinavia and the western Mediterranean. Regional patterns in the δ 13C network are less clear and are timescale dependent. Our results indicate that future reconstruction efforts should concentrate on δ 18O data in the identified European regions.

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