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Title of Journal: Int J Biometeorol

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Abbravation: International Journal of Biometeorology

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Springer-Verlag

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DOI

10.1016/0265-9646(91)90011-6

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1432-1254

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Pollen season and climate Is the timing of birch

Authors: R M Newnham T H Sparks C A Skjøth K Head B AdamsGroom M Smith
Publish Date: 2012/06/19
Volume: 57, Issue: 3, Pages: 391-400
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Abstract

In light of heightened interest in the response of pollen phenology to temperature we investigated recent changes to the onset of Betula birch pollen seasons in central and southern England including a test of predicted advancement of the Betula pollen season for London We calculated onset of birch pollen seasons using daily airborne pollen data obtained at London Plymouth and Worcester determined trends in the start of the pollen season and compared timing of the birch pollen season with observed temperature patterns for the period 1995–2010 We found no overall change in the onset of birch pollen in the study period although there was evidence that the response to temperature was nonlinear and that a lower asymptotic start of the pollen season may exist The start of the birch pollen season was strongly correlated with March mean temperature These results reinforce previous findings showing that the timing of the birch pollen season in the UK is particularly sensitive to spring temperatures The climate relationship shown here persists over both longer decadalscale trends and shorter seasonal trends as well as during periods of ‘signswitching’ when cooler spring temperatures result in later start dates These attributes combined with the wide geographical coverage of airborne pollen monitoring sites some with records extending back several decades provide a powerful tool for the detection of climate change impacts although local site factors and the requirement for winter chilling may be confounding factorsThis work was partly funded by the Copenhagen Global Change Initiative wwwcogcidk and the VillumKann Rasmussen Foundation through a Post Doc grant to Carsten Ambelas Skjøth and a Royal Society of New Zealand ISAT grant to Rewi Newnham Tim Sparks acknowledges the support of the Technische Universität München – Institute for Advanced Study funded by the German Excellence Initiative The authors would like to thank the National Pollen and Aerobiology Research Unit at the University of Worcester who provided the pollen counts particularly all those staff who are actively involved in producing pollen count data The authors are also grateful to the Environmental and Public Protection offices Islington who operate the pollen trap in North London to Martin Kent for insightful comments on the manuscript and to Tim Absolom for drafting Fig 5 Data on birch leafing were kindly supplied by the Woodland Trust


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