Changes in climate and fire regimes are transforming the boreal forest, the world’s largest biome. Boreal North America recently experienced two years with large burned area: 2014 in the Northwest Territories and 2015 in Alaska. Here we use climate, lightning, fire and vegetation data sets to assess the mechanisms contributing to large fire years. We find that lightning ignitions have increased since 1975, and that the 2014 and 2015 events coincided with a record number of lightning ignitions and exceptionally high levels of burning near the northern treeline. Lightning ignition explained more than 55% of the interannual variability in burned area, and was correlated with temperature and precipitation, which are projected to increase by mid-century. The analysis shows that lightning drives interannual and long-term ignition and burned area dynamics in boreal North America, and implies future ignition increases may increase carbon loss while accelerating the northward expansion of boreal forest.
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Kuusela, K. The Dynamics of Boreal Coniferous Forests (Finnish National Fund for Research and Development, 1992).
Scharlemann, J. P., Tanner, E. V., Hiederer, R. & Kapos, V. Global soil carbon: understanding and managing the largest terrestrial carbon pool. Carbon Manag. 5, 81–91 (2014).
Rogers, B. M., Soja, A. J., Goulden, M. L. & Randerson, J. T. Influence of tree species on continental differences in boreal fires and climate feedbacks. Nat. Geosci. 8, 228–234 (2015).
Kasischke, E. S. & Turetsky, M. R. Recent changes in the fire regime across the North American boreal region—spatial and temporal patterns of burning across Canada and Alaska. Geophys. Res. Lett. 33, L09703 (2006).
Gillett, N. P., Weaver, A. J., Zwiers, F. W. & Flannigan, M. D. Detecting the effect of climate change on Canadian forest fires. Geophys. Res. Lett. 31, L18211 (2004).
Balshi, M. S. et al. Assessing the response of area burned to changing climate in western boreal North America using a Multivariate Adaptive Regression Splines (MARS) approach. Glob. Change Biol. 15, 578–600 (2009).
Flannigan, M. D., Logan, K. A., Amiro, B. D., Skinner, W. R. & Stocks, B. J. Future area burned in Canada. Climatic Change 72, 1–16 (2005).
Young, A. M., Higuera, P. E., Duffy, P. A. & Hu, F. S. Climatic thresholds shape northern high-latitude fire regimes and imply vulnerability to future climate change. Ecography 40, 606–617 (2016).
French, N. H. F. et al. Fire in arctic tundra of Alaska: past fire activity, future fire potential, and significance for land management and ecology. Int. J. Wildl. Fire 24, 1045–1061 (2015).
Hu, F. S. et al. Tundra burning in Alaska: linkages to climatic change and sea ice retreat. J. Geophys. Res. 115, G04002 (2010).
Venevsky, S., Thonicke, K., Sitch, S. & Cramer, W. Simulating fire regimes in human-dominated ecosystems: Iberian Peninsula case study. Glob. Change Biol. 8, 984–998 (2002).
Kasischke, E., Williams, D. & Barry, D. Analysis of the patterns of large fires in the boreal forest region of Alaska. Int. J. Wildl. Fire 11, 131–144 (2002).
Stocks, B. J. et al. Large forest fires in Canada, 1959–1997. J. Geophys. Res. 108, 8149 (2002).
Dissing, D. & Verbyla, D. L. Spatial patterns of lightning strikes in interior Alaska and their relations to elevation and vegetation. Can. J. For. Res. 33, 770–782 (2003).
Hu, F. S. et al. Arctic tundra fires: natural variability and responses to climate change. Front. Ecol. Environ. 13, 369–377 (2015).
Héon, J., Arseneault, D. & Parisien, M.-A. Resistance of the boreal forest to high burn rates. Proc. Natl Acad. Sci. USA 111, 13888–13893 (2014).
Kelly, R. et al. Recent burning of boreal forests exceeds fire regime limits of the past 10,000 years. Proc. Natl Acad. Sci. USA 110, 13055–13060 (2013).
Johnstone, J. F., Hollingsworth, T. N., Chapin, F. S. & Mack, M. C. Changes in fire regime break the legacy lock on successional trajectories in Alaskan boreal forest. Glob. Change Biol. 16, 1281–1295 (2010).
Parks, S. A., Holsinger, L. M., Miller, C. & Nelson, C. R. Wildland fire as a self-regulating mechanism: the role of previous burns and weather in limiting fire progression. Ecol. Appl. 25, 1478–1492 (2015).
Krawchuk, M. A. & Cumming, S. G. Effects of biotic feedback and harvest management on boreal forest fire activity under climate change. Ecol. Appl. 21, 122–136 (2011).
Romps, D. M., Seeley, J. T., Vollaro, D. & Molinari, J. Projected increase in lightning strikes in the United States due to global warming. Science 346, 851–854 (2014).
Krause, A., Kloster, S., Wilkenskjeld, S. & Paeth, H. The sensitivity of global wildfires to simulated past, present, and future lightning frequency. J. Geophys. Res. 119, 312–322 (2014).
Veraverbeke, S., Rogers, B. M. & Randerson, J. T. Daily burned area and carbon emissions from boreal fires in Alaska. Biogeosciences 12, 3579–3601 (2015).
Turetsky, M. R. et al. Recent acceleration of biomass burning and carbon losses in Alaskan forests and peatlands. Nat. Geosci. 4, 27–31 (2011).
Sedano, F. & Randerson, J. T. Multi-scale influence of vapor pressure deficit on fire ignition and spread in boreal forest ecosystems. Biogeosciences 11, 3739–3755 (2014).
Partain, J. L. et al. An assessment of the role of anthropogenic climate change in the Alaska fire season of 2015. Bull. Am. Meteorol. Soc. 97, S14–S18 (2016).
Flannigan, M. et al. Global wildland fire season severity in the 21st century. For. Ecol. Manag. 294, 54–61 (2013).
Liston, G. E. & Hiemstra, C. A. The changing cryosphere: pan-Arctic snow trends (1979–2009). J. Clim. 24, 5691–5712 (2011).
Westerling, A. L., Hidalgo, H. G., Cayan, D. R. & Swetnam, T. W. Warming and earlier spring increase western US forest wildfire activity. Science 313, 940–943 (2006).
Magi, B. I. Global lightning parameterization from CMIP5 climate model output. J. Atmos. Ocean. Technol. 32, 434–452 (2015).
Rogers, B. M., Randerson, J. T. & Bonan, G. B. High-latitude cooling associated with landscape changes from North American boreal forest fires. Biogeosciences 10, 699–718 (2013).
MacDonald, G. M. et al. Holocene treeline history and climate change across Northern Eurasia. Quat. Res. 53, 302–311 (2000).
Harsch, M. A., Hulme, P. E., McGlone, M. S. & Duncan, R. P. Are treelines advancing? A global meta-analysis of treeline response to climate warming. Ecol. Lett. 12, 1040–1049 (2009).
Pielke, R. A. & Vidale, P. L. The boreal forest and the polar front. J. Geophys. Res. 100, 25755–25758 (1995).
Davis, M. B. & Shaw, R. G. Range shifts and adaptive responses to Quaternary climate change. Science 292, 673–679 (2001).
Dale, V. H. et al. Climate change and forest disturbances. Bioscience 51, 723–734 (2001).
Hewitt, R. E. et al. Getting to the root of the matter: landscape implications of plant-fungal interactions for tree migration in Alaska. Landsc. Ecol. 31, 895–911 (2015).
Payette, S. & Filion, L. White spruce expansion at the tree line and recent climatic change. Can. J. For. Res. 15, 241–251 (1985).
Bonan, G. B., Pollard, D. & Thompson, S. L. Effects of boreal forest vegetation on global climate. Nature 359, 716–718 (1992).
Euskirchen, E. S., McGuire, A. D., Chapin, F. S., Yi, S. & Thompson, C. C. Changes in vegetation in northern Alaska under scenarios of climate change, 2003–2100: implications for climate feedbacks. Ecol. Appl. 19, 1022–1043 (2009).
Krawchuk, M. A., Cumming, S. G., Flannigan, M. D. & Wein, R. W. Biotic and abiotic regulation of lightning fire initiation in the mixedwood boreal forest. Ecology 87, 458–468 (2006).
French, N. H. F., Whitley, M. A. & Jenkins, L. K. Fire disturbance effects on land surface albedo in Alaskan tundra. J. Geophys. Res. 121, 841–854 (2016).
Mack, M. C. et al. Carbon loss from an unprecedented Arctic tundra wildfire. Nature 475, 489–492 (2011).
Mouteva, G. O. et al. Black carbon aerosol dynamics and isotopic composition in Alaska linked with boreal fire emissions and depth of burn in organic soils. Glob. Biogeochem. Cycles 29, 1977–2000 (2015).
Bond, T. C. et al. Bounding the role of black carbon in the climate system: a scientific assessment. J. Geophys. Res. 118, 5380–5552 (2013).
Brown, D. R. N. et al. Interactive effects of wildfire and climate on permafrost degradation in Alaskan lowland forests. J. Geophys. Res. 120, 1619–1637 (2015).
Schuur, E. A. G. et al. Climate change and the permafrost carbon feedback. Nature 520, 171–179 (2015).
Hantson, S. et al. The status and challenge of global fire modelling. Biogeosciences 13, 3359–3375 (2016).
Pfeiffer, M., Spessa, A. & Kaplan, J. O. A model for global biomass burning in preindustrial time: LPJ-LMfire (v1.0). Geosci. Model Dev. 6, 643–685 (2013).
Mesinger, F. et al. North American regional reanalysis. Bull. Am. Meteorol. Soc. 87, 343–360 (2006).
Taylor, K. E., Stouffer, R. J. & Meehl, G. A. An overview of CMIP5 and the experiment design. Bull. Am. Meteorol. Soc. 93, 485–498 (2012).
Meinshausen, M. et al. The RCP greenhouse gas concentrations and their extensions from 1765 to 2300. Climatic Change 109, 213–241 (2011).
Fowler, H. J., Blenkinsop, S. & Tebaldi, C. Linking climate change modelling to impacts studies: recent advances in downscaling techniques for hydrological modelling. Int. J. Climatol. 27, 1547–1578 (2007).
Kochtubajda, B., Stewart, R. E., Gyakum, J. R. & Flannigan, M. D. Summer convection and lightning over the Mackenzie river basin and their impacts during 1994 and 1995. Atmos. Ocean 40, 199–220 (2002).
Kochtubajda, B. et al. Lightning and fires in the Northwest Territories and responses to future climate change. Arctic 59, 211–221 (2006).
Farukh, M. A. & Hayasaka, H. Active forest fire occurrences in severe lightning years in Alaska. J. Nat. Disaster Sci. 33, 71–84 (2012).
Burrows, W. R. et al. Lightning occurrence patterns over Canada and adjacent United States from lightning detection network observations. Atmos. Ocean 40, 59–80 (2002).
Reap, R. Climatological characteristics and objective prediction of thunderstorms over Alaska. Weather Forecast. 6, 309–319 (1991).
Nowacki, G. & Brock, T. Ecoregions and Subregions of Alaska, EcoMap Version 2.0 (map) (USDA Forest Service, 1995).
Cecil, D. J., Buechler, D. E. & Blakeslee, R. J. Gridded lightning climatology from TRMM-LIS and OTD: dataset description. Atmos. Res. 135–136, 404–414 (2014).
Veraverbeke, S. et al. Mapping the daily progression of large wildland fires using MODIS active fire data. Int. J. Wildl. Fire 23, 655–667 (2014).
López García, M. J. & Caselles, V. Mapping burns and natural reforestation using thematic Mapper data. Geocarto Int. 6, 31–37 (1991).
Beaudoin, A. et al. Mapping attributes of Canada’s forests at moderate resolution through k NN and MODIS imagery. Can. J. For. Res. 44, 521–532 (2014).
Prichard, S. J. et al. Evaluation of the CONSUME and FOFEM fuel consumption models in pine and mixed hardwood forests of the eastern United States. Can. J. For. Res. 44, 784–795 (2014).
Van Wagner, C. E. Development and Structure of the Canadian Forest Fire Weather Index System (Environment Canada, Forestry Service, 1987).
Kasischke, E. S. et al. Quantifying burned area for North American forests: Implications for direct reduction of carbon stocks. J. Geophys. Res. 116, G04003 (2011).
Hansen, M. C. et al. Global percent tree cover at a spatial resolution of 500 meters: first results of the MODIS vegetation continuous fields algorithm. Earth Interact. 7, 1–15 (2003).
Walker, D. A. et al. The Circumpolar Arctic vegetation map. J. Veg. Sci. 16, 267–282 (2005).
Carroll, M. L., Townshend, J. R., DiMiceli, C. M., Noojipady, P. & Sohlberg, R. A. A new global raster water mask at 250 m resolution. Int. J. Digit. Earth 2, 291–308 (2009).
Legendre, P. & Legendre, L. Numerical Ecology (Elsevier, 2012).
Price, C. & Rind, D. The impact of a 2 × CO2 climate on lightning-caused fires. J. Clim. 7, 1484–1494 (1994).
Peterson, D., Wang, J., Ichoku, C. & Remer, L. A. Effects of lightning and other meteorological factors on fire activity in the North American boreal forest: implications for fire weather forecasting. Atmos. Chem. Phys. 10, 6873–6888 (2010).
Veraverbeke, S. et al. ABoVE: Ignitions, Burned Area and Emissions of Fires in AK, YT, and NWT, 2001–2015http://dx.doi.org/10.3334/ORNLDAAC/1341 (2017).
This work was funded by the National Aeronautics and Space Administration (NASA) Carbon in Arctic Reservoirs Experiment (CARVE) and the Arctic-Boreal Vulnerability Experiment (ABoVE, NNX15AU56A). We acknowledge the World Climate Research Program’s Working Group on Coupled Modeling, which is responsible for the Climate Model Intercomparison Project, and we thank the climate modelling groups for producing and making available their model output. We wish to thank Environment and Climate Change Canada for their generous permission to use Canadian Lightning Detection Network data. We thank NASA for providing access to the Optical Transient Detector gridded lightning climatology data. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. S.V. would like to thank C. Verstraete for discussions on early ideas of this paper and support.
The authors declare no competing financial interests.
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Veraverbeke, S., Rogers, B., Goulden, M. et al. Lightning as a major driver of recent large fire years in North American boreal forests. Nature Clim Change 7, 529–534 (2017). https://doi.org/10.1038/nclimate3329
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