AliBlarquezGirardinEtAl2012

Référence

Ali, A.A., Blarquez, O., Girardin, M.P., Hely, C., Tinquaut, F., El Guellab, A., Valsecchi, V., Terrier, A., Bremond, L., Genries, A., Gauthier, S., Bergeron, Y. (2012) Control of the multimillennial wildfire size in boreal North America by spring climatic conditions. Proceedings of the National Academy of Sciences of the United States of America, 109(51):20966-20970. (Scopus )

Résumé

Wildfire activity in North American boreal forests increased during the last decades of the 20th century, partly owing to ongoing human-caused climatic changes. How these changes affect regional fire regimes (annual area burned, seasonality, and number, size, and severity of fires) remains uncertain as data available to explore fire-climate-vegetation interactions have limited temporal depth. Here we present a Holocene reconstruction of fire regime, combining lacustrine charcoal analyses with past drought and fire-season length simulations to elucidate the mechanisms linking long-term fire regime and climatic changes. We decomposed fire regime into fire frequency (FF) and biomass burned (BB) and recombined these into a new index to assess fire size (FS) fluctuations. Results indicated that an earlier termination of the fire season, due to decreasing summer radiative insolation and increasing precipitation over the last 7.0 ky, induced a sharp decrease in FF and BB ca. 3.0 kyBP toward the present. In contrast, a progressive increase of FS was recorded, which is most likely related to a gradual increase in temperatures during the spring fire season. Continuing climatic warming could lead to a change in the fire regime toward larger spring wildfires in eastern boreal North America.

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@ARTICLE { AliBlarquezGirardinEtAl2012,
    AUTHOR = { Ali, A.A. and Blarquez, O. and Girardin, M.P. and Hely, C. and Tinquaut, F. and El Guellab, A. and Valsecchi, V. and Terrier, A. and Bremond, L. and Genries, A. and Gauthier, S. and Bergeron, Y. },
    TITLE = { Control of the multimillennial wildfire size in boreal North America by spring climatic conditions },
    JOURNAL = { Proceedings of the National Academy of Sciences of the United States of America },
    YEAR = { 2012 },
    VOLUME = { 109 },
    PAGES = { 20966-20970 },
    NUMBER = { 51 },
    ABSTRACT = { Wildfire activity in North American boreal forests increased during the last decades of the 20th century, partly owing to ongoing human-caused climatic changes. How these changes affect regional fire regimes (annual area burned, seasonality, and number, size, and severity of fires) remains uncertain as data available to explore fire-climate-vegetation interactions have limited temporal depth. Here we present a Holocene reconstruction of fire regime, combining lacustrine charcoal analyses with past drought and fire-season length simulations to elucidate the mechanisms linking long-term fire regime and climatic changes. We decomposed fire regime into fire frequency (FF) and biomass burned (BB) and recombined these into a new index to assess fire size (FS) fluctuations. Results indicated that an earlier termination of the fire season, due to decreasing summer radiative insolation and increasing precipitation over the last 7.0 ky, induced a sharp decrease in FF and BB ca. 3.0 kyBP toward the present. In contrast, a progressive increase of FS was recorded, which is most likely related to a gradual increase in temperatures during the spring fire season. Continuing climatic warming could lead to a change in the fire regime toward larger spring wildfires in eastern boreal North America. },
    COMMENT = { Export Date: 7 January 2013 Source: Scopus CODEN: PNASA doi: 10.1073/pnas.1203467109 },
    ISSN = { 00278424 (ISSN) },
    KEYWORDS = { Canada, Drought code, Global circulation model, Paleoclimate },
    OWNER = { Luc },
    TIMESTAMP = { 2013.01.07 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84871390480&partnerID=40&md5=1b0bd06c25bccadb31c7e7a12c0f6b27 },
}

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