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Wind Tunnel Experiments to Study Chaparral Crown Fires
09:27

Wind Tunnel Experiments to Study Chaparral Crown Fires

Published on: November 14, 2017

Constraints on global fire activity vary across a resource gradient.

Meg A Krawchuk1, Max A Moritz

  • 1Department of Environmental Science, Policy and Management, 137 Mulford Hall, MC#3114, University of California, Berkeley, California 94720, USA. megk@berkeley.edu

Ecology
|May 13, 2011
PubMed
Summary

Wildfire activity is controlled by fuel availability and weather, but their importance varies globally. Understanding these varying constraints helps predict future fire risk worldwide.

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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

Published on: June 1, 2016

Area of Science:

  • Ecology
  • Global Change Biology
  • Fire Ecology

Background:

  • Wildfire activity is influenced by fuel availability and atmospheric conditions.
  • The varying constraints hypothesis posits that the relative importance of these factors differs spatially.
  • Understanding these dynamics is crucial for predicting fire regimes under climate change.

Purpose of the Study:

  • To empirically test the varying constraints hypothesis on a global scale.
  • To analyze the spatial heterogeneity in the drivers of wildfire activity.
  • To synthesize macro-scale findings with local and regional fire studies.

Main Methods:

  • Utilized global monthly wildfire data from 2001-2007.
  • Analyzed relationships with soil moisture and mid-tropospheric circulation.
  • Synthesized data across gradients of net primary productivity, temperature, and biome type.

Main Results:

  • Demonstrated support for the varying constraints hypothesis.
  • Showed that fuel moisture is a stronger constraint in resource-rich areas (e.g., tropics).
  • Indicated fuel availability is a greater constraint in resource-limited areas (e.g., deserts, grasslands).

Conclusions:

  • Biophysical factors for wildfires must coincide, but their relative influence varies predictably.
  • Macro-scale evidence supports spatially varying constraints on fire activity.
  • Findings inform predictions of how fire sensitivity may change globally with altered climate.