Synchronous fire activity in the tropical high Andes: an indication of regional climate forcing

Roman-Cuesta, R. M., Carmona-Moreno, C., Lizcano, G., New, M., Silman, M., Knoke, T., Malhi, Y., Oliveras, I., Asbjornsen, H. and Vuille, M. (2014) Synchronous fire activity in the tropical high Andes: an indication of regional climate forcing. Global Change Biology, 20 (6). pp. 1929-1942. ISSN 1354-1013

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Abstract

Global climate models suggest enhanced warming of the tropical mid and upper troposphere, with larger temperature rise rates at higher elevations. Changes in fire activity are amongst the most significant ecological consequences of rising temperatures and changing hydrological properties in mountainous ecosystems, and there is a global evidence of increased fire activity with elevation. Whilst fire research has become popular in the tropical lowlands, much less is known of the tropical high Andean region (>2000masl, from Colombia to Bolivia). This study examines fire trends in the high Andes for three ecosystems, the Puna, the Paramo and the Yungas, for the period 1982-2006. We pose three questions: (i) is there an increased fire response with elevation? (ii) does the El Nino- Southern Oscillation control fire activity in this region? (iii) are the observed fire trends human driven (e.g., human practices and their effects on fuel build-up) or climate driven? We did not find evidence of increased fire activity with elevation but, instead, a quasicyclic and synchronous fire response in Ecuador, Peru and Bolivia, suggesting the influence of high-frequency climate forcing on fire responses on a subcontinental scale, in the high Andes. ENSO variability did not show a significant relation to fire activity for these three countries, partly because ENSO variability did not significantly relate to precipitation extremes, although it strongly did to temperature extremes. Whilst ENSO did not individually lead the observed regional fire trends, our results suggest a climate influence on fire activity, mainly through a sawtooth pattern of precipitation (increased rainfall before fire-peak seasons (t-1) followed by drought spells and unusual low temperatures (t0), which is particularly common where fire is carried by low fuel loads (e.g., grasslands and fine fuel). This climatic sawtooth appeared as the main driver of fire trends, above local human influences and fuel build-up cyclicity.

Item Type: Article
Uncontrolled Keywords: andes,climate change,enso,fire,fuel load,grasslands,mei,paramo,precipitation,puna,southern-oscillation,rainfall variability,northern patagonia,elevation gradient,forest-fires,ice cores,vegetation,temperature,history,precipitation
Faculty \ School: Faculty of Social Sciences > School of International Development
Depositing User: Pure Connector
Date Deposited: 28 Apr 2015 14:04
Last Modified: 22 Apr 2020 00:07
URI: https://ueaeprints.uea.ac.uk/id/eprint/53269
DOI: 10.1111/gcb.12538

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