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Temperature Covariance in Tree Ring Reconstructions and Model Simulations Over the Past Millennium
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 18, p. 9458-9469Article in journal (Refereed) Published
Abstract [en]

Spatial covariance in the simulated temperature evolution over the past millennium has been reported to exceed that of multiproxy-based reconstructions. Here we use tree ring-based temperature reconstructions and state-of-the-art climate model simulations to assess temporal changes in Northern Hemisphere intercontinental temperature covariance during the last 1000 years. Tree ring-only approaches reveal stronger agreement with model simulations compared to multiproxy networks. Although simulated temperatures exhibit a substantial spread among individual models, intercontinental temperature coherency is mainly driven by the cooling of large volcanic eruptions in 1257, 1452, 1600, and 1815 Common Era. The coherence of these synchronizing events appears to be elevated in several climate simulations relative to their own unforced covariance baselines and in comparison to the proxy reconstructions. This suggests that some models likely overestimate the amplitude of abrupt summer cooling in response to volcanic eruptions, particularly at larger spatial scales.

Place, publisher, year, edition, pages
2017. Vol. 44, no 18, p. 9458-9469
Keyword [en]
Climate variability, Climate change and variability, Global climate models, Paleoclimatology, paleoclimate, spatial temperature synchrony, millennial scale, radiative forcing, proxy model comparison
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Natural Sciences
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URN: urn:nbn:se:polar:diva-3911DOI: 10.1002/2017GL073239OAI: oai:DiVA.org:polar-3911DiVA, id: diva2:1165220
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2017GL073239

Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-12

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Publisher's full texthttp://dx.doi.org/10.1002/2017GL073239
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