Leaf onset in the northern hemisphere triggered by daytime temperature
Piao, S. L. (Zhongguo ke xue yuan. Institute of Tibetan Plateau Research)
Tan, Jianguang (Sino-French Institute for Earth System Science)
Chen, Anping (Princeton University. Departament of Ecology and Evolutionary Biology)
Fu, Yongshuo H.. (Sino-French Institute for Earth System Science)
Ciais, Philippe (Laboratoire des Sciences du Climat et de l'Environment)
Liu, Qiang (Sino-French Institute for Earth System Science)
Janssens, Ivan (Universiteit Antwerpen. Departement Biologie)
Vicca, Sara (Universiteit Antwerpen. Departement Biologie)
Zeng, Zhenzhong (Sino-French Institute for Earth System Science)
Jeong, Su-Jong (Jet Propulsion Laboratory (U.S.))
Li, Yue (Sino-French Institute for Earth System Science)
Myneni, Ranga B. (Boston University. Department of Earth and Environment)
Peng, Shushi (Sino-French Institute for Earth System Science)
Shen, Miaogen (Zhongguo ke xue yuan. Institute of Tibetan Plateau Research)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Date:	2015
Abstract:	Recent warming significantly advanced leaf onset in the northern hemisphere. This signal cannot be accurately reproduced by current models parameterized by daily mean temperature (Tmean). Here using in situ observations of leaf unfolding dates (LUDs) in Europe and the United States, we show that the interannual anomalies of LUD during 1982-2011 are triggered by daytime (Tmax) more than by nighttime temperature (Tmin). Furthermore, an increase of 1 °C in Tmax would advance LUD by 4. 7 days in Europe and 4. 3 days in the United States, more than the conventional temperature sensitivity estimated from Tmean. The triggering role of Tmax, rather than the Tmin or Tmean variable, is also supported by analysis of the large-scale patterns of satellite-derived vegetation green-up in spring in the northern hemisphere (>30°N). Our results suggest a new conceptual framework of leaf onset using daytime temperature to improve the performance of phenology modules in current Earth system models.
Grants:	European Commission 610028
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Earth sciences ; Climate science ; Ecology
Published in:	Nature communications, April 2015, p. 1-8, ISSN 2041-1723

DOI: 10.1038/ncomms7911
PMID: 25903224

Published version 8 p, 1.1 MB

Post-print 31 p, 1.4 MB

Suplement 21 p, 2.6 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
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Articles > Published articles