Global patterns of vegetation fire seasonality

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MODIS Terra +Aqua. • 2002-2012. • 0.5° - 16day. Function Fitting ... Seasonality drivers. Unimodal. Bimodal. Source : LADA Land Use systems map (FAO) ...
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