Open Access
Evidence for A Weakening Relationship between Interannual Temperature Variability and Northern Vegetation Activity
Shilong Piao,Huijuan Nan,Chris Huntingford,Philippe Ciais,Pierre Friedlingstein,Stephen Sitch,Shushi Peng,Shushi Peng,Anders Ahlström,Josep G. Canadell,Nan Cong,Samuel Levis,Peter Levy,Lingli Liu,Mark R. Lomas,Jiafu Mao,Ranga B. Myneni,Philippe Peylin,Ben Poulter,Xiaoying Shi,Guodong Yin,Nicolas Viovy,Tao Wang,Tao Wang,Xuhui Wang,Soenke Zaehle,Ning Zeng,Zhenzhong Zeng,Anping Chen +28 more
- Vol. 2014
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TLDR
This article showed that the strength of the relationship between the interannual variability of growing season NDVI and temperature (partial correlation coefficient RNDVI-GT) declined substantially between 1982 and 2011.Abstract:
Satellite-derived Normalized Difference Vegetation Index (NDVI), a proxy of vegetation productivity, is known to be correlated with temperature in northern ecosystems. This relationship, however, may change over time following alternations in other environmental factors. Here we show that above 30°N, the strength of the relationship between the interannual variability of growing season NDVI and temperature (partial correlation coefficient RNDVI-GT) declined substantially between 1982 and 2011. This decrease in RNDVI-GT is mainly observed in temperate and arctic ecosystems, and is also partly reproduced by process-based ecosystem model results. In the temperate ecosystem, the decrease in RNDVI-GT coincides with an increase in drought. In the arctic ecosystem, it may be related to a nonlinear response of photosynthesis to temperature, increase of hot extreme days and shrub expansion over grass-dominated tundra. Our results caution the use of results from interannual time scales to constrain the decadal response of plants to ongoing warming.read more
Citations
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Greening of the Earth and its drivers
Zaichun Zhu,Zaichun Zhu,Shilong Piao,Shilong Piao,Ranga B. Myneni,Mengtian Huang,Zhenzhong Zeng,Josep G. Canadell,Philippe Ciais,Philippe Ciais,Stephen Sitch,Pierre Friedlingstein,Almut Arneth,Chunxiang Cao,Lei Cheng,Etsushi Kato,Charles D. Koven,Yue Li,Xu Lian,Yongwen Liu,Ronggao Liu,Jiafu Mao,Yaozhong Pan,Shushi Peng,Josep Peñuelas,Benjamin Poulter,Thomas A. M. Pugh,Thomas A. M. Pugh,Benjamin D. Stocker,Benjamin D. Stocker,Nicolas Viovy,Xuhui Wang,Ying-Ping Wang,Zhiqiang Xiao,Hui Yang,Sönke Zaehle,Ning Zeng +36 more
TL;DR: In this paper, the authors used three long-term satellite leaf area index (LAI) records and ten global ecosystem models to investigate four key drivers of LAI trends during 1982-2009.
Global patterns of land-atmosphere fluxes of carbon dioxide, latent heat, and sensible heat derived from eddy covariance, satellite, and meteorological observations
Abstract: We upscaled FLUXNET observations of carbon dioxide, water, and energy fluxes to the global scale using the machine learning technique, model tree ensembles (MTE). We trained MTE to predict site-level gross primary productivity (GPP), terrestrial ecosystem respiration (TER), net ecosystem exchange (NEE), latent energy (LE), and sensible heat (H) based on remote sensing indices, climate and meteorological data, and information on land use. We applied the trained MTEs to generate global flux fields at a 0.5 degrees x 0.5 degrees spatial resolution and a monthly temporal resolution from 1982 to 2008. Cross-validation analyses revealed good performance of MTE in predicting among-site flux variability with modeling efficiencies (MEf) between 0.64 and 0.84, except for NEE (MEf = 0.32). Performance was also good for predicting seasonal patterns (MEf between 0.84 and 0.89, except for NEE (0.64)). By comparison, predictions of monthly anomalies were not as strong (MEf between 0.29 and 0.52). Improved accounting of disturbance and lagged environmental effects, along with improved characterization of errors in the training data set, would contribute most to further reducing uncertainties. Our global estimates of LE (158 +/- 7 J x 10(18) yr(-1)), H (164 +/- 15 J x 10(18) yr(-1)), and GPP (119 +/- 6 Pg C yr(-1)) were similar to independent estimates. Our global TER estimate (96 +/- 6 Pg C yr(-1)) was likely underestimated by 5-10%. Hot spot regions of interannual variability in carbon fluxes occurred in semiarid to semihumid regions and were controlled by moisture supply. Overall, GPP was more important to interannual variability in NEE than TER. Our empirically derived fluxes may be used for calibration and evaluation of land surface process models and for exploratory and diagnostic assessments of the biosphere.
Journal ArticleDOI
Characteristics, drivers and feedbacks of global greening
Shilong Piao,Shilong Piao,Xuhui Wang,Taejin Park,Taejin Park,Chi Chen,Xu Lian,Yue He,Jarle W. Bjerke,Anping Chen,Philippe Ciais,Philippe Ciais,Hans Tømmervik,Ramakrishna R. Nemani,Ranga B. Myneni +14 more
TL;DR: In this article, the authors examined the detection of the greening signal, its causes and its consequences, and showed that greening is pronounced over intensively farmed or afforested areas, such as in China and India, reflecting human activities.
Journal ArticleDOI
Detection and Attribution of Vegetation Greening Trend in China over the Last 30 Years
Shilong Piao,Shilong Piao,Guodong Yin,Jianguang Tan,Lei Cheng,Mengtian Huang,Yue Li,Ronggao Liu,Jiafu Mao,Ranga B. Myneni,Shushi Peng,Ben Poulter,Xiaoying Shi,Zhiqiang Xiao,Ning Zeng,Zhenzhong Zeng,Ying-Ping Wang +16 more
TL;DR: This study is the first to comprehensively detect and attribute a greening trend in China over the last three decades, using three different satellite-derived Leaf Area Index (LAI) datasets for detection as well as five different process-based ecosystem models for attribution.
Journal ArticleDOI
Recent Third Pole’s Rapid Warming Accompanies Cryospheric Melt and Water Cycle Intensification and Interactions between Monsoon and Environment: Multidisciplinary Approach with Observations, Modeling, and Analysis
Tandong Yao,Yongkang Xue,Deliang Chen,Fahu Chen,Lonnie G. Thompson,Peng Cui,Toshio Koike,William K. M. Lau,Dennis P. Lettenmaier,Volker Mosbrugger,Renhe Zhang,Baiqing Xu,Jeff Dozier,Thomas W. Gillespie,Yu Gu,Shichang Kang,Shilong Piao,Shiori Sugimoto,Kenichi Ueno,Lei Wang,Weicai Wang,Fan Zhang,Yongwei Sheng,Weidong Guo,Ailikun,Xiao Xin Yang,Yaoming Ma,Samuel S. P. Shen,Zhongbo Su,Fei Chen,Shunlin Liang,Yimin Liu,Vijay P. Singh,Kun Yang,Daqing Yang,Xinquan Zhao,Yun Qian,Yu Zhang,Qian Li +38 more
TL;DR: The Third Pole (TP) is experiencing rapid warming and is currently in its warmest period in the past 2,000 years as mentioned in this paper, and the latest development in multidisciplinary TP research is reviewed in this paper.
References
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Climate Change 2007: The Physical Science Basis Summary for Policymakers:
Journal ArticleDOI
Europe-wide reduction in primary productivity caused by the heat and drought in 2003
Philippe Ciais,Markus Reichstein,Nicolas Viovy,A. Granier,Jérôme Ogée,Vincent Allard,M. Aubinet,Nina Buchmann,C. Bernhofer,Arnaud Carrara,Frédéric Chevallier,N. de Noblet,Andrew D. Friend,Pierre Friedlingstein,Thomas Grünwald,Bernard Heinesch,Petri Keronen,Alexander Knohl,Gerhard Krinner,Denis Loustau,Giovanni Manca,Giorgio Matteucci,Franco Miglietta,Jean-Marc Ourcival,Dario Papale,Kim Pilegaard,Serge Rambal,G. Seufert,Jean-François Soussana,María José Sanz,Ernst Detlef Schulze,Timo Vesala,Riccardo Valentini +32 more
TL;DR: An increase in future drought events could turn temperate ecosystems into carbon sources, contributing to positive carbon-climate feedbacks already anticipated in the tropics and at high latitudes.
Journal ArticleDOI
Increased plant growth in the northern high latitudes from 1981 to 1991
TL;DR: In this paper, the authors present evidence from satellite data that the photosynthetic activity of terrestrial vegetation increased from 1981 to 1991 in a manner that is suggestive of an increase in plant growth associated with a lengthening of the active growing season.
Journal ArticleDOI
FLUXNET: A New Tool to Study the Temporal and Spatial Variability of Ecosystem-Scale Carbon Dioxide, Water Vapor, and Energy Flux Densities
Dennis D. Baldocchi,Eva Falge,Lianhong Gu,Richard J. Olson,David Y. Hollinger,Steven W. Running,P. M. Anthoni,Ch. Bernhofer,Kenneth J. Davis,Robert G. Evans,Jose D. Fuentes,Allen H. Goldstein,Gabriel G. Katul,Beverly E. Law,Xuhui Lee,Yadvinder Malhi,Tilden P. Meyers,William Munger,Walter C. Oechel,Kim Pilegaard,Hans Peter Schmid,Riccardo Valentini,Shashi B. Verma,Timo Vesala,Kell B. Wilson,S. C. Wofsy +25 more
TL;DR: The FLUXNET project as mentioned in this paper is a global network of micrometeorological flux measurement sites that measure the exchanges of carbon dioxide, water vapor, and energy between the biosphere and atmosphere.
Journal ArticleDOI
Climate-Driven Increases in Global Terrestrial Net Primary Production from 1982 to 1999
Ramakrishna R. Nemani,Charles D. Keeling,Hirofumi Hashimoto,Hirofumi Hashimoto,William M. Jolly,Stephen C. Piper,Compton J. Tucker,Ranga B. Myneni,Steven W. Running +8 more
TL;DR: It is indicated that global changes in climate have eased several critical climatic constraints to plant growth, such that net primary production increased 6% (3.4 petagrams of carbon over 18 years) globally.
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