Leaf onset in the northern hemisphere triggered by daytime temperature
Shilong Piao,Jianguang Tan,Anping Chen,Yongshuo H. Fu,Philippe Ciais,Qiang Liu,Ivan A. Janssens,Sara Vicca,Zhenzhong Zeng,Su-Jong Jeong,Yue Li,Ranga B. Myneni,Shushi Peng,Miaogen Shen,Josep Peñuelas +14 more
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TLDR
This work shows that the interannual anomalies of LUD during 1982–2011 are triggered by daytime (Tmax) more than by nighttime temperature (Tmin), and suggests a new conceptual framework of leaf onset using daytime temperature to improve the performance of phenology modules in current Earth system models.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 Ci nTmax 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 (430N). Our results suggest a new conceptual framework of leaf onset using daytime temperature to improve the performance of phenology modules in current Earth systemread more
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Spatial variance of spring phenology in temperate deciduous forests is constrained by background climatic conditions
Marc Peaucelle,Marc Peaucelle,Ivan A. Janssens,Benjamin D. Stocker,Benjamin D. Stocker,Adrià Descals Ferrando,Yongshuo H. Fu,Roberto Molowny-Horas,Philippe Ciais,Josep Peñuelas +9 more
TL;DR: The authors show that the spatial variation of leaf unfolding in 8 deciduous tree species in Europe can be explained by local adaptation to long-term mean climate conditions, which would imply that models using constant temperature response are inherently inaccurate at local scale.
Journal ArticleDOI
Northern forest winters have lost cold, snowy conditions that are important for ecosystems and human communities
Alexandra R. Contosta,N. J. Casson,Sarah Garlick,Sarah J. Nelson,Matthew P. Ayres,Elizabeth A. Burakowski,John Campbell,Irena F. Creed,Catherine Eimers,Celia A. Evans,Ivan J. Fernandez,Colin B. Fuss,Thomas G. Huntington,Kaizad F. Patel,Kaizad F. Patel,Rebecca Sanders-DeMott,Kyongho Son,Pamela H. Templer,Casey Thornbrugh +18 more
TL;DR: It is shown that cold and snow covered conditions have generally decreased over the past 100 years and this trends suggest positive outcomes for tree health as related to reduced fine root mortality and nutrient loss associated with winter frost but negative outcomes asrelated to the northward advancement and proliferation of forest insect pests.
Journal ArticleDOI
Understanding long-term (1982–2013) patterns and trends in winter wheat spring green-up date over the North China Plain
TL;DR: An improved GUD algorithm is introduced to extract GUD data for 32 years for the winter wheat croplands on the North China Plain, using the third-generation normalized difference vegetation index form Global Inventory Modeling and Mapping Studies (GIMMS3g NDVI).
Journal ArticleDOI
NDVI indicated inter-seasonal non-uniform time-lag responses of terrestrial vegetation growth to daily maximum and minimum temperature
TL;DR: In this article, the authors quantitatively investigated the inter-seasonal non-uniform time-lag effects of Tmax and/or Tmin on terrestrial vegetation growth from 1982 to 2014 by applying partial correlation and time lag analyses.
Journal ArticleDOI
Earlier leaf-out warms air in the north
TL;DR: In this article, the authors used the Community Earth System Model 1.2 to investigate climate feedbacks from advanced leaf-out in northern temperate and boreal vegetation and identified warming hotspots in the Canadian Arctic Archipelago, east and west edges of Siberia and southeastern Tibetan Plateau.
References
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