Recurrent transitions to Little Ice Age-like climatic regimes over the Holocene
| Autor: | Phil Jones, Mauri Timonen, Vladimir Matskovsky, Richard Hall, Markku Oinonen, Kari Mielikäinen, Laura Arppe, Pekka Nöjd, Markus Stoffel, Samuli Helama |
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| Přispěvatelé: | Natural Sciences Unit, Finnish Museum of Natural History |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
1171 Geosciences
Atmospheric Science 010504 meteorology & atmospheric sciences Atlantic meridional overturning circulation Volcanic forcing Forcing (mathematics) 010502 geochemistry & geophysics 01 natural sciences Article Paleoclimatology ddc:550 Dendrochronology East Atlantic pattern 1172 Environmental sciences Holocene 0105 earth and related environmental sciences ddc:333.7-333.9 geography geography.geographical_feature_category Northern Hemisphere Volcano Arctic 13. Climate action Climatology Little Ice Age Period (geology) Tree ring Geology |
| Zdroj: | Climate Dynamics Climate Dynamics, Vol. 56, No 11-12 (2021) pp. 3817-3833 |
| ISSN: | 0930-7575 |
| Popis: | Holocene climate variability is punctuated by episodic climatic events such as the Little Ice Age (LIA) predating the industrial-era warming. Their dating and forcing mechanisms have however remained controversial. Even more crucially, it is uncertain whether earlier events represent climatic regimes similar to the LIA. Here we produce and analyse a new 7500-year long palaeoclimate record tailored to detect LIA-like climatic regimes from northern European tree-ring data. In addition to the actual LIA, we identify LIA-like ca. 100–800 year periods with cold temperatures combined with clear sky conditions from 540 CE, 1670 BCE, 3240 BCE and 5450 BCE onwards, these LIA-like regimes covering 20% of the study period. Consistent with climate modelling, the LIA-like regimes originate from a coupled atmosphere–ocean–sea ice North Atlantic-Arctic system and were amplified by volcanic activity (multiple eruptions closely spaced in time), tree-ring evidence pointing to similarly enhanced LIA-like regimes starting after the eruptions recorded in 1627 BCE, 536/540 CE and 1809/1815 CE. Conversely, the ongoing decline in Arctic sea-ice extent is mirrored in our data which shows reversal of the LIA-like conditions since the late nineteenth century, our record also correlating highly with the instrumentally recorded Northern Hemisphere and global temperatures over the same period. Our results bridge the gaps between low- and high-resolution, precisely dated proxies and demonstrate the efficacy of slow and fast components of the climate system to generate LIA-like climate regimes. Supplementary Information The online version contains supplementary material available at 10.1007/s00382-021-05669-0. |
| Databáze: | OpenAIRE |
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