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| Titel |
Arctic Holocene proxy climate database – new approaches to assessing geochronological accuracy and encoding climate variables |
| VerfasserIn |
H. S. Sundqvist, D. S. Kaufman, N. P. McKay, N. L. Balascio, J. P. Briner, L. C. Cwynar, H. P. Sejrup, H. Seppä, D. A. Subetto, J. T. Andrews, Y. Axford, J. Bakke, H. J. B. Birks, S. J. Brooks, A. de Vernal, A. E. Jennings, F. C. Ljungqvist, K. M. Rühland, C. Saenger, J. P. Smol, A. E. Viau |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 4 ; Nr. 10, no. 4 (2014-08-29), S.1605-1631 |
| Datensatznummer |
250117031
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| Publikation (Nr.) |
 copernicus.org/cp-10-1605-2014.pdf |
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| Zusammenfassung |
| 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. |
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