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| Titel |
Climate change between the mid and late Holocene in northern high latitudes – Part 1: Survey of temperature and precipitation proxy data |
| VerfasserIn |
H. S. Sundqvist, Q. Zhang, A. Moberg, K. Holmgren, H. Körnich, J. Nilsson, G. Brattström |
| 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 ; 6, no. 5 ; Nr. 6, no. 5 (2010-09-17), S.591-608 |
| Datensatznummer |
250003757
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| Publikation (Nr.) |
 copernicus.org/cp-6-591-2010.pdf |
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| Zusammenfassung |
| We undertake a study in two parts, where the overall aim
is to quantitatively compare results from climate proxy data with results
from several climate model simulations from the Paleoclimate Modelling
Intercomparison Project for the mid-Holocene period and the pre-industrial,
conditions for the pan-arctic region, north of 60° N. In this first
paper, we survey the available published local temperature and precipitation
proxy records. We also discuss and quantifiy some uncertainties in the
estimated difference in climate between the two periods as recorded in the
available data. The spatial distribution of available published local
proxies has a marked geographical bias towards land areas surrounding the
North Atlantic sector, especially Fennoscandia. The majority of the
reconstructions are terrestrial, and there is a large over-representation
towards summer temperature records. The available reconstructions indicate
that the northern high latitudes were warmer in both summer, winter and the
in annual mean temperature at the mid-Holocene (6000 BP ± 500 yrs)
compared to the pre-industrial period (1500 AD ± 500 yrs). For usage in
the model-data comparisons (in Part 1), we estimate the calibration
uncertainty and also the internal variability in the proxy records, to
derive a combined minimum uncertainty in the reconstructed temperature
change between the two periods. Often, the calibration uncertainty alone, at
a certain site, exceeds the actual reconstructed climate change at the site
level. In high-density regions, however, neighbouring records can be merged
into a composite record to increase the signal-to-noise ratio. The challenge
of producing reliable inferred climate reconstructions for the Holocene
cannot be underestimated, considering the fact that the estimated
temperature and precipitation fluctuations during this period are in
magnitude similar to, or lower than, the uncertainties the reconstructions.
We advocate a more widespread practice of archiving proxy records as most of
the potentially available reconstructions are not published in digital form. |
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