Carbon and Beyond: The Biogeochemistry of Climate in a Rapidly Changing Amazon

Kristofer Covey, Fiona Soper, Sunitha Pangala, Angelo Bernardino, Zoe Pagliaro, Luana Basso, Henrique Cassol, Philip Fearnside, Diego Navarrete, Sidney Novoa, Henrique Sawakuchi, Thomas Lovejoy, Jose Marengo, Carlos A. Peres, Jonathan Baillie, Paula Bernasconi, Jose Camargo, Carolina Freitas, Bruce Hoffman, Gabriela B. NardotoIsmael Nobre, Juan Mayorga, Rita Mesquita, Silvia Pavan, Flavia Pinto, Flavia Rocha, Ricardo de Assis Mello, Alice Thuault, Alexis Anne Bahl, Aurora Elmore

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Abstract

The Amazon Basin is at the center of an intensifying discourse about deforestation, land-use, and global change. To date, climate research in the Basin has overwhelmingly focused on the cycling and storage of carbon (C) and its implications for global climate. Missing, however, is a more comprehensive consideration of other significant biophysical climate feedbacks [i.e., CH4, N2O, black carbon, biogenic volatile organic compounds (BVOCs), aerosols, evapotranspiration, and albedo] and their dynamic responses to both localized (fire, land-use change, infrastructure development, and storms) and global (warming, drying, and some related to El Niño or to warming in the tropical Atlantic) changes. Here, we synthesize the current understanding of (1) sources and fluxes of all major forcing agents, (2) the demonstrated or expected impact of global and local changes on each agent, and (3) the nature, extent, and drivers of anthropogenic change in the Basin. We highlight the large uncertainty in flux magnitude and responses, and their corresponding direct and indirect effects on the regional and global climate system. Despite uncertainty in their responses to change, we conclude that current warming from non-CO2 agents (especially CH4 and N2O) in the Amazon Basin largely offsets—and most likely exceeds—the climate service provided by atmospheric CO2 uptake. We also find that the majority of anthropogenic impacts act to increase the radiative forcing potential of the Basin. Given the large contribution of less-recognized agents (e.g., Amazonian trees alone emit ~3.5% of all global CH4), a continuing focus on a single metric (i.e., C uptake and storage) is incompatible with genuine efforts to understand and manage the biogeochemistry of climate in a rapidly changing Amazon Basin.

Original languageEnglish
Article number618401
JournalFrontiers in Forests and Global Change
Volume4
DOIs
Publication statusPublished - 11 Mar 2021

Keywords

  • biogenic VOC emission
  • black carbon
  • climate change
  • land use - land cover change
  • methane
  • nitrous oxide

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