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The Role of Fire on Water and Carbon Cycling Across Two Contrasting Terra Firme Amazonian Forests
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  • Gabriel de Oliveira,
  • Luiz Aragao,
  • Jing Chen,
  • Nathaniel Brunsell,
  • Guilherme Mataveli,
  • Ricardo Dalagnol,
  • Steven Schultze,
  • Brett Kreinsen,
  • Carlos Costa dos Santos,
  • Hugo Seixas,
  • Scott Stark,
  • Andre Lima,
  • Yosio Shimabukuro
Gabriel de Oliveira
University of South Alabama

Corresponding Author:[email protected]

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Luiz Aragao
INPE National Institute for Space Research
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Jing Chen
University of Toronto
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Nathaniel Brunsell
University of Kansas
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Guilherme Mataveli
INPE National Institute for Space Research
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Ricardo Dalagnol
INPE National Institute for Space Research
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Steven Schultze
University of South Alabama
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Brett Kreinsen
University of Toronto
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Carlos Costa dos Santos
UFCG Federal University of Campina Grande
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Hugo Seixas
UNICAMP State University of Campinas
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Scott Stark
Michigan State University
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Andre Lima
University of Maryland
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Yosio Shimabukuro
INPE
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Abstract

Recently intensified forest fires in the Amazon region have led to large-scale forest losses, particularly in Brazil, after more than a decade of effective forest conservation policy. Analysis of the time course of fire impacts on water and carbon cycling is required for accurate measurement of changes in the forest-atmosphere interactions. Moreover, measurements must also account for natural variations associated with vegetation phenology, and generally direct and indirect effects of environmental changes at annual, seasonal and sub-annual time scales. Here, we study the recovery of two contrasting terra firme forests affected by fire in eastern (sub-montane ombrophile forests) and western (bamboo dominated forests) Amazonia in terms of water and carbon fluxes utilizing remote sensing (Moderate Resolution Imaging Spectroradiometer, MODIS) and climate reanalysis data (Global Land Data Assimilation System, GLDAS). Our results showed that fires significantly increased land surface temperature and air temperature in the forests over different time scales. However, the forests showed an ability to recover their original states in terms of coupling between the carbon and water cycles based on the comparison of the periods before and after the fires. Results from a wavelet analysis showed an intensification in annual and seasonal fluctuations, and in some cases (e.g., evapotranspiration) sub-annual fluctuations. Understanding the mechanisms controlling the forest-atmosphere interactions are essential for assessing how forest fires will influence the exchanges of water and carbon in the future. Improving data and theory about the impacts of fire and other disturbances on the energy balance is essential to improve earth systems models for forecasting the role of tropical forest fires in climate change. Within this context, our approach and, consequently, the results obtained here will help improve the understanding of how fires in terra firme Amazonian forests impact land-atmosphere coupling at different spatial and temporal scales.