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Selection: Randerson:JT [8 articles] 

Publications by author Randerson:JT.
 

A human-driven decline in global burned area

  
Science, Vol. 356, No. 6345. (30 June 2017), pp. 1356-1362, https://doi.org/10.1126/science.aal4108

Abstract

[Burn less, baby, burn less] Humans have, and always have had, a major impact on wildfire activity, which is expected to increase in our warming world. Andela et al. use satellite data to show that, unexpectedly, global burned area declined by ∼25% over the past 18 years, despite the influence of climate. The decrease has been largest in savannas and grasslands because of agricultural expansion and intensification. The decline of burned area has consequences for predictions of future changes to the atmosphere, ...

 

Influence of tree species on continental differences in boreal fires and climate feedbacks

  
Nature Geoscience, Vol. 8, No. 3. (2 February 2015), pp. 228-234, https://doi.org/10.1038/ngeo2352

Abstract

Wildfires are common in boreal forests around the globe and strongly influence ecosystem processes. However, North American forests support more high-intensity crown fires than Eurasia, where lower-intensity surface fires are common. These two types of fire can result in different net effects on climate as a consequence of their contrasting impacts on terrestrial albedo and carbon stocks. Here we use remote-sensing imagery, climate reanalysis data and forest inventories to evaluate differences in boreal fire dynamics between North America and Eurasia and ...

 

Analysis of daily, monthly, and annual burned area using the fourth-generation global fire emissions database (GFED4)

  
Journal of Geophysical Research: Biogeosciences, Vol. 118, No. 1. (2013), pp. 317-328, https://doi.org/10.1002/jgrg.20042

Abstract

We describe the fourth generation of the Global Fire Emissions Database (GFED4) burned area data set, which provides global monthly burned area at 0.25°  spatial resolution from mid-1995 through the present and daily burned area for the time series extending back to August 2000. We produced the full data set by combining 500 m MODIS burned area maps with active fire data from the Tropical Rainfall Measuring Mission (TRMM) Visible and Infrared Scanner (VIRS) and the Along-Track Scanning Radiometer (ATSR) family of ...

 

Plant responses to increasing CO2 reduce estimates of climate impacts on drought severity

  
Proceedings of the National Academy of Sciences, Vol. 113, No. 36. (06 September 2016), pp. 10019-10024, https://doi.org/10.1073/pnas.1604581113

Abstract

[Significance] We show that the water savings that plants experience under high CO2 conditions compensate for much of the effect of warmer temperatures, keeping the amount of water on land, on average, higher than we would predict with common drought metrics, and with a different spatial pattern. The implications of plants needing less water under high CO2 reaches beyond drought prediction to the assessment of climate change impacts on agriculture, water resources, wildfire risk, and vegetation dynamics. [Abstract] Rising atmospheric CO2 will make Earth ...

 

Recovery of Aboveground Plant Biomass and Productivity After Fire in Mesic and Dry Black Spruce Forests of Interior Alaska

  
Ecosystems In Ecosystems, Vol. 11, No. 2. (March 2008), pp. 209-225, https://doi.org/10.1007/s10021-007-9117-9

Abstract

Plant biomass accumulation and productivity are important determinants of ecosystem carbon (C) balance during post-fire succession. In boreal black spruce (Picea mariana) forests near Delta Junction, Alaska, we quantified aboveground plant biomass and net primary productivity (ANPP) for 4 years after a 1999 wildfire in a well-drained (dry) site, and also across a dry and a moderately well-drained (mesic) chronosequence of sites that varied in time since fire (2 to ∼116 years). Four years after fire, total biomass at the 1999 burn ...

 

Quantifying fire-wide carbon emissions in interior Alaska using field measurements and Landsat imagery

  
Journal of Geophysical Research: Biogeosciences, Vol. 119, No. 8. (1 August 2014), 2014JG002657, https://doi.org/10.1002/2014jg002657

Abstract

Carbon emissions from boreal forest fires are projected to increase with continued warming and constitute a potentially significant positive feedback to climate change. The highest consistent combustion levels are reported in interior Alaska and can be highly variable depending on the consumption of soil organic matter. Here we present an approach for quantifying emissions within a fire perimeter using remote sensing of fire severity. Combustion from belowground and aboveground pools was quantified at 22 sites (17 black spruce and five white ...

 

Mapping the daily progression of large wildland fires using MODIS active fire data

  
International Journal of Wildland Fire, Vol. 23, No. 5. (2014), 655, https://doi.org/10.1071/wf13015
Keywords: mapping   modelling   modis   regression   wildfires  

Abstract

High temporal resolution information on burnt area is needed to improve fire behaviour and emissions models. We used the Moderate Resolution Imaging Spectroradiometer (MODIS) thermal anomaly and active fire product (MO(Y)D14) as input to a kriging interpolation to derive continuous maps of the timing of burnt area for 16 large wildland fires. For each fire, parameters for the kriging model were defined using variogram analysis. The optimal number of observations used to estimate a pixel’s time of burning varied between four ...

 

Climate control of terrestrial carbon exchange across biomes and continents

  
Environmental Research Letters, Vol. 5, No. 3. (01 July 2010), 034007, https://doi.org/10.1088/1748-9326/5/3/034007
by Chuixiang Yi, Daniel Ricciuto, Runze Li, John Wolbeck, Xiyan Xu, Mats Nilsson, Luis Aires, John D. Albertson, Christof Ammann, M. Altaf Arain, Alessandro C. de Araujo, Marc Aubinet, Mika Aurela, Zoltán Barcza, Alan Barr, Paul Berbigier, Jason Beringer, Christian Bernhofer, Andrew T. Black, Paul V. Bolstad, Fred C. Bosveld, Mark S. J. Broadmeadow, Nina Buchmann, Sean P. Burns, Pierre Cellier, Jingming Chen, Jiquan Chen, Philippe Ciais, Robert Clement, Bruce D. Cook, Peter S. Curtis, D. Bryan Dail, Ebba Dellwik, Nicolas Delpierre, Ankur R. Desai, Sabina Dore, Danilo Dragoni, Bert G. Drake, Eric Dufrêne, Allison Dunn, Jan Elbers, Werner Eugster, Matthias Falk, Christian Feigenwinter, Lawrence B. Flanagan, Thomas Foken, John Frank, Juerg Fuhrer, Damiano Gianelle, Allen Goldstein, Mike Goulden, Andre Granier, Thomas Grünwald, Lianhong Gu, Haiqiang Guo, Albin Hammerle, Shijie Han, Niall P. Hanan, László Haszpra, Bernard Heinesch, Carole Helfter, Dimmie Hendriks, Lindsay B. Hutley, Andreas Ibrom, Cor Jacobs, Torbjörn Johansson, Marjan Jongen, Gabriel Katul, Gerard Kiely, Katja Klumpp, Alexander Knohl, Thomas Kolb, Werner L. Kutsch, Peter Lafleur, Tuomas Laurila, Ray Leuning, Anders Lindroth, Heping Liu, Benjamin Loubet, Giovanni Manca, Michal Marek, Hank A. Margolis, Timothy A. Martin, William J. Massman, Roser Matamala, Giorgio Matteucci, Harry McCaughey, Lutz Merbold, Tilden Meyers, Mirco Migliavacca, Franco Miglietta, Laurent Misson, Meelis Mölder, John Moncrieff, Russell K. Monson, Leonardo Montagnani, Mario Montes-Helu, Eddy Moors, Christine Moureaux, Mukufute M. Mukelabai, J. William Munger, May Myklebust, Zoltán Nagy, Asko Noormets, Walter Oechel, Ram Oren, Stephen G. Pallardy, Kyaw Tha Paw, João S. Pereira, Kim Pilegaard, Krisztina Pintér, Casimiro Pio, Gabriel Pita, Thomas L. Powell, Serge Rambal, James T. Randerson, Celso von Randow, Corinna Rebmann, Janne Rinne, Federica Rossi, Nigel Roulet, Ronald J. Ryel, Jorgen Sagerfors, Nobuko Saigusa, María J. Sanz, Giuseppe-Scarascia Mugnozza, Hans P. Schmid, Guenther Seufert, Mario Siqueira, Jean-François Soussana, Gregory Starr, Mark A. Sutton, John Tenhunen, Zoltán Tuba, Juha-Pekka Tuovinen, Riccardo Valentini, Christoph S. Vogel, Jingxin Wang, Shaoqiang Wang, Weiguo Wang, Lisa R. Welp, Xuefa Wen, Sonia Wharton, Matthew Wilkinson, Christopher A. Williams, Georg Wohlfahrt, Susumu Yamamoto, Guirui Yu, Roberto Zampedri, Bin Zhao, Xinquan Zhao

Abstract

Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric carbon dioxide because of the potential accelerating effects of positive climate–carbon cycle feedbacks. However, directly observed relationships between climate and terrestrial CO 2 exchange with the atmosphere across biomes and continents are lacking. Here we present data describing the relationships between net ecosystem exchange of carbon (NEE) and climate factors as measured using the eddy covariance method at 125 unique sites ...

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