Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 10, 1605-1631, 2014
http://www.clim-past.net/10/1605/2014/
doi:10.5194/cp-10-1605-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
29 Aug 2014
Arctic Holocene proxy climate database – new approaches to assessing geochronological accuracy and encoding climate variables
H. S. Sundqvist1,2, D. S. Kaufman3, N. P. McKay3, N. L. Balascio4, J. P. Briner5, L. C. Cwynar6, H. P. Sejrup7, H. Seppä8, D. A. Subetto9,10,11, J. T. Andrews12, Y. Axford13, J. Bakke7,14, H. J. B. Birks15,16,17, S. J. Brooks18, A. de Vernal19, A. E. Jennings12, F. C. Ljungqvist2,20, K. M. Rühland21, C. Saenger22, J. P. Smol21, and A. E. Viau23 1Department of Physical Geography & Quaternary Geology, Stockholm University, Stockholm, Sweden
2Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
3School of Earth Sciences & Environmental Sustainability, Northern Arizona University, Flagstaff, USA
4Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, USA
5Department of Geology, University at Buffalo, New York, USA
6Department of Biology, University of New Brunswick, Fredericton, Canada
7Department of Earth Sciences, University of Bergen, Bergen, Norway
8Department of Geosciences and Geography, University of Helsinki, Helsinki, Finland
9Northern Water Problems Institute, Karelian Research Center, Russian Academy of Sciences, Petrozavodsk, Russia
10Herzen State Pedagogical University of Russia, Saint Petersburg, Russia
11Kazan Federal University, Kazan, Russia
12Institute of Arctic and Alpine Research, University of Colorado, Boulder, USA
13Department of Earth & Planetary Sciences, Northwestern University, Illinois, USA
14Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
15Department of Biology, University of Bergen, Bergen, Norway
16Environmental Change Research Centre, University College London, UK
17School of Geography and the Environment, University of Oxford, London, UK
18Department of Life Sciences, Natural History Museum, London, UK
19GEOTOP, Université du Québec à Montréal, Montreal, Canada
20Department of History, Stockholm University, Stockholm, Sweden
21Paleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen's University, Ontario, Canada
22Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, USA
23Department of Geography, University of Ottawa, Ottawa, Canada
Abstract. We present a systematic compilation of previously published Holocene proxy climate records from the Arctic. We identified 170 sites from north of 58° N latitude where proxy time series extend back at least to 6 cal ka (all ages in this article are in calendar years before present – BP), are resolved at submillennial scale (at least one value every 400 ± 200 years) and have age models constrained by at least one age every 3000 years. In addition to conventional metadata for each proxy record (location, proxy type, reference), we include two novel parameters that add functionality to the database. First, "climate interpretation" is a series of fields that logically describe the specific climate variable(s) represented by the proxy record. It encodes the proxy–climate relation reported by authors of the original studies into a structured format to facilitate comparison with climate model outputs. Second, "geochronology accuracy score" (chron score) is a numerical rating that reflects the overall accuracy of 14C-based age models from lake and marine sediments. Chron scores were calculated using the original author-reported 14C ages, which are included in this database. The database contains 320 records (some sites include multiple records) from six regions covering the circumpolar Arctic: Fennoscandia is the most densely sampled region (31% of the records), whereas only five records from the Russian Arctic met the criteria for inclusion. The database contains proxy records from lake sediment (60%), marine sediment (32%), glacier ice (5%), and other sources. Most (61%) reflect temperature (mainly summer warmth) and are primarily based on pollen, chironomid, or diatom assemblages. Many (15%) reflect some aspect of hydroclimate as inferred from changes in stable isotopes, pollen and diatom assemblages, humification index in peat, and changes in equilibrium-line altitude of glaciers. This comprehensive database can be used in future studies to investigate the spatio-temporal pattern of Arctic Holocene climate changes and their causes. The Arctic Holocene data set is available from NOAA Paleoclimatology.

Citation: Sundqvist, H. S., Kaufman, D. S., McKay, N. P., Balascio, N. L., Briner, J. P., Cwynar, L. C., Sejrup, H. P., Seppä, H., Subetto, D. A., Andrews, J. T., Axford, Y., Bakke, J., Birks, H. J. B., Brooks, S. J., de Vernal, A., Jennings, A. E., Ljungqvist, F. C., Rühland, K. M., Saenger, C., Smol, J. P., and Viau, A. E.: Arctic Holocene proxy climate database – new approaches to assessing geochronological accuracy and encoding climate variables, Clim. Past, 10, 1605-1631, doi:10.5194/cp-10-1605-2014, 2014.
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