Leaf onset in the northern hemisphere triggered by daytime temperature

Piao, Shilong; Tan, Jianguang; Chen, Anping; Fu, Yongshuo H.; Ciais, Philippe; Liu, Qiang; Janssens, Ivan A.; Vicca, Sara; Zeng, Zhenzhong; Jeong, Su-Jong; Li, Yue; Myneni, Ranga B.; Peng, Shushi; Shen, Miaogen; Peñuelas, Josep

doi:10.1038/ncomms7911

articleNature CommunicationsApr 23, 2015GOLD OA

Leaf onset in the northern hemisphere triggered by daytime temperature

SPShilong Piao JTJianguang Tan ACAnping Chen YHYongshuo H. Fu PCPhilippe Ciais

Chinese Academy of Sciences · Center for Excellence in Tibetan Plateau Earth Sciences · +13 more institutions

PubMed

Indexed incrossrefdoajpubmed

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 (T(mean)). 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 (T(min)). 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 T(mean). The triggering role of Tmax, rather than the T(min) or T(mean) variable, is also supported by analysis…

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Keywords

Daytime
Northern Hemisphere
Geography
Atmospheric sciences
Physics

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