Climate drivers for peatland palaeoclimate records

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Climate drivers for peatland palaeoclimate records

Show simple item record Charman, Dan, J en_GB Barber, Keith E. en_GB Blaauw, Maarten en_GB Langdon, Pete G. en_GB Mauquoy, Dmitri en_GB Daley, Tim J. en_GB Hughes, Paul D.M. en_GB Karofeld, Edgar en_GB 2010-06-17T14:19:58Z en_GB 2011-01-25T10:39:19Z en_US 2013-03-20T14:32:04Z 2009-09 en_GB
dc.description.abstract Reconstruction of hydroclimate variability is an important part of understanding natural climate change on decadal to millennial timescales. Peatland records reconstruct ‘bog surface wetness’ (BSW) changes, but it is unclear whether it is a relative dominance of precipitation or temperature that has driven these variations over Holocene timescales. Previously, correlations with instrumental climate data implied that precipitation is the dominant control. However, a recent chironomid inferred July temperature record suggested temperature changes were synchronous with BSW over the mid-late Holocene. This paper provides new analyses of these data to test competing hypotheses of climate controls on bog surface wetness and discusses some of the distal drivers of large-scale spatial patterns of BSW change. Using statistically based estimates of uncertainty in chronologies and proxy records, we show a correlation between Holocene summer temperature and BSW is plausible, but that chronologies are insufficiently precise to demonstrate this conclusively. Simulated summer moisture deficit changes for the last 6000 years forced by temperature alone are relatively small compared with observations over the 20th century. Instrumental records show that summer moisture deficit provides the best explanatory variable for measured water table changes and is more strongly correlated with precipitation than with temperature in both Estonia and the UK. We conclude that BSW is driven primarily by precipitation, reinforced by temperature, which is negatively correlated with precipitation and therefore usually forces summer moisture deficit in the same direction. In western Europe, BSW records are likely to be forced by changes in the strength and location of westerlies, linked to large-scale North Atlantic ocean and atmospheric circulation. en_GB
dc.identifier.citation Quaternary Science Reviews, 2009, 28 (19-20): pp. 1811-1819 en_GB
dc.identifier.doi 10.1016/j.quascirev.2009.05.013 en_GB
dc.identifier.uri en_GB
dc.language.iso en en_GB
dc.publisher Elsevier Ltd en_GB
dc.relation.url en_GB
dc.subject Peatland en_GB
dc.subject bog surface wetness en_GB
dc.subject Holocene en_GB
dc.subject climate change en_GB
dc.title Climate drivers for peatland palaeoclimate records en_GB
dc.type Article en_GB 2010-06-17T14:19:58Z en_GB 2011-01-25T10:39:19Z en_US 2013-03-20T14:32:04Z
dc.identifier.issn 02773791 en_GB
dc.description Reproduced with permission of the publisher. Copyright © 2009 Elsevier Ltd en_GB
dc.identifier.journal Quaternary Science Reviews en_GB

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