Global patterns of vegetation fire seasonality A. Benali1*, B. Mota1, J.M.C. Pereira1, D. Oom1, N. Carvalhais2,3 1Centro
de Estudos Florestais, ISA, Universidade Técnica Lisboa, Portugal 2Max Planck Institut fur Biogeochemie, Jena, Germany 3CENSE, DCEA-FCT, Universidade Nova de Lisboa, Portugal
[email protected] EGU, April 2013
Vegetation Fire Seasonality • Seasonality is a component of Fire Regime; • Seasonal fire activity has not been thoroughly characterized at the global scale so far; • Objectives – Identify the types of fire seasonality at a global scale – Identify the influence of the main drivers of fire seasonality.
Seasonality Classification Annual Active Fire Data Decadal Active Fire Data
Nº Active Fires Function Fitting Von Mises Circular Distribution (N=1 and N=2)
Low Fire Incidence
yes
< 10
Min MEF
yes
Other
< 0.60
∆ MEF(uni, bi)
yes
UniModal
< 0.15
• MODIS Terra +Aqua • 2002-2012 • 0.5° - 16day
µ1 - µ2
yes
< 3.5 months
Oom and Pereira et al. 2013
BiModal
3
Seasonality Classification Look at Annual Seasonality
Decadal Seasonality
Annual Seasonality Yearly Fit Type Yearly YearlyFit FitType Type
Unimodal
Systematically Bimodal
Bimodal
Frequently Bimodal
Based on the proportion of years that are Bi and Unimodal
Other
Low Fire Incidence
Sporadically Bimodal Nº Years with Fires