An annually resolved bristlecone pine carbon isotope chronology for the last millennium |
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| Authors: | Roderick J Bale Iain Robertson Neil J Loader Mary Gagen Danny McCarroll |
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| Institution: | a Department of Archaeology History and Anthropology, University of Wales Trinity Saint David, Lampeter, Ceredigion, SA48 7ED, UKb Department of Geography, Swansea University, Singleton Park, Swansea SA2 8PP, UKc Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, USA |
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| Abstract: | We present the first near millennium-length, annually resolved stable isotope record from bristlecone pines (Pinus longaeva, D.K Bailey). The carbon isotope ratios from the cellulose of seven trees from the White Mountains of California, corrected for anthropogenic changes in atmospheric chemistry, are used to reconstruct growing season (June through August) precipitation back to AD 1085. Extremely negative isotope results are strongly correlated with proposed severest El Niño events over the last 500 yr, and similar values in the first half of the millennium are used to reconstruct a further 13 strong El Niño events, concentrated in the 12th Century and the mid 13th and 14th Centuries. Ring-width chronologies from adjacent sites in the White Mountains demonstrate a high degree of decadal covariance with the δ13C series, although there are several periods of notable divergence. |
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| Keywords: | Bristlecone pine Carbon isotopes Dendroclimatology Climate change Tree rings Palaeoclimate Drought Precipitation El Niñ o |
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