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| Sundqvist, H. S.; Zhang, Q.; Moberg, A.; Holmgren, K.; Kornich, H.; Nilsson, J.; Brattstrom, G.. |
| 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 degrees 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... |
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| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00231/34257/32623.pdf |
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| Ljungqvist, F. C.; Krusic, P. J.; Brattstrom, G.; Sundqvist, H. S.. |
| We analyse the spatio-temporal patterns of temperature variability over Northern Hemisphere land areas, on centennial time-scales, for the last 12 centuries using an unprecedentedly large network of temperature-sensitive proxy records. Geographically widespread positive temperature anomalies are observed from the 9th to 11th centuries, similar in extent and magnitude to the 20th century mean. A dominance of widespread negative anomalies is observed from the 16th to 18th centuries. Though we find the amplitude and spatial extent of the 20th century warming is within the range of natural variability over the last 12 centuries, we also find that the rate of warming from the 19th to the 20th century is unprecedented in the context of the last 1200 yr. The... |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00274/38498/36956.pdf |
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