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The CRE tambora.org - new data and tools for collaborative research in climate and environmental history

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Geoscience Data Journal

Wiley-Blackwell

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      Highly variable Northern Hemisphere temperatures reconstructed from low- and high-resolution proxy data.

      A number of reconstructions of millennial-scale climate variability have been carried out in order to understand patterns of natural climate variability, on decade to century timescales, and the role of anthropogenic forcing. These reconstructions have mainly used tree-ring data and other data sets of annual to decadal resolution. Lake and ocean sediments have a lower time resolution, but provide climate information at multicentennial timescales that may not be captured by tree-ring data. Here we reconstruct Northern Hemisphere temperatures for the past 2,000 years by combining low-resolution proxies with tree-ring data, using a wavelet transform technique to achieve timescale-dependent processing of the data. Our reconstruction shows larger multicentennial variability than most previous multi-proxy reconstructions, but agrees well with temperatures reconstructed from borehole measurements and with temperatures obtained with a general circulation model. According to our reconstruction, high temperatures--similar to those observed in the twentieth century before 1990--occurred around ad 1000 to 1100, and minimum temperatures that are about 0.7 K below the average of 1961-90 occurred around ad 1600. This large natural variability in the past suggests an important role of natural multicentennial variability that is likely to continue.
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        ICOADS Release 2.5: extensions and enhancements to the surface marine meteorological archive

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          Five hundred years of gridded high-resolution precipitation reconstructions over Europe and the connection to large-scale circulation

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            Author and article information

            Journal
            Geoscience Data Journal
            Geosci. Data J.
            Wiley-Blackwell
            20496060
            November 2015
            November 2015
            : 2
            : 2
            : 63-77
            10.1002/gdj3.30
            © 2015

            http://doi.wiley.com/10.1002/tdm_license_1.1

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            Self URI (article page): http://doi.wiley.com/10.1002/gdj3.30

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