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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Spatiotemporal variation in vegetation spring phenology and its response to climate change in freshwater marshes of Northeast China
TL;DR: It was found that precipitation was a dominant factor determining the SOS in arid or semi-arid regions (Songnen plain and Liaohe plain), while temperature played a bigger role in determining the emergency SOS in Sanjiang plain and three cold mountains of the Northeast China.
Journal ArticleDOI
Intercomparison and evaluation of spring phenology products using National Phenology Network and AmeriFlux observations in the contiguous United States
Dailiang Peng,Xiaoyang Zhang,Chaoyang Wu,Wenjiang Huang,Alemu Gonsamo,Alfredo Huete,Kamel Didan,Bin Tan,Xinjie Liu,Bing Zhang +9 more
TL;DR: In this article, the authors extracted spring green-up onset dates (GUD) over the contiguous United States (CONUS) from six major land surface phenology (LSP) products: (1) Moderate Resolution Imaging Spectroradiometer (MODIS) Land Cover Dynamics Phenology (MCD12Q2); (2) Vegetation Index and Phenology Multi-sensor Phenology(VIPPHENEVI2), (3) Global Long-Term Climate Modeling Grid Land Surface Phenology, (4 and 5) North American Carbon Program (NACP)
Journal ArticleDOI
Influence of winter precipitation on spring phenology in boreal forests
TL;DR: The results provide a physical basis for the winter precipitation-SOS relationship, suggesting that an increase in winter precipitation can alleviate strong advancing trends in spring vegetation growth in conjunction with global warming even for temperature-limited ecosystems.
Journal ArticleDOI
Land surface phenology as indicator of global terrestrial ecosystem dynamics: A systematic review
TL;DR: Land surface phenology (LSP) is the study of seasonal patterns in plant phenophases based on time series from vegetation indices or biophysical variables derived from satellite data, and has played an essential role in monitoring the response of terrestrial ecosystems to environmental changes from local to global scales as discussed by the authors.
Journal ArticleDOI
Increasing interannual variability of global vegetation greenness
TL;DR: In this paper, the changes and drivers of the interannual variability (IAV) of vegetation greenness over time is still poorly understood, despite the long-term greening trend in global vegetation identified in previous investigations.
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