| Large-Scale Biosphere-Atmosphere Experiment in Amazônia | |
|---|---|
| Name | Large-Scale Biosphere-Atmosphere Experiment in Amazônia |
| Acronym | LBA |
| Established | 1990s |
| Location | Amazon Basin |
Large-Scale Biosphere-Atmosphere Experiment in Amazônia is a multinational, multidisciplinary research program focused on interactions among the Amazon River, South American Monsoon System, Amazon Basin, tropical rainforest, and the atmosphere. Launched in the 1990s, it brought together researchers from institutions including the National Aeronautics and Space Administration, the National Science Foundation (United States), the Brazilian National Council for Scientific and Technological Development, and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior. The program integrated field campaigns, remote sensing, modelling, and socio-environmental studies across regions influenced by the Amazon River and adjacent biomes.
The program originated amid growing international concern about deforestation in the Amazon Rainforest, greenhouse gas emissions in the Kyoto Protocol era, and advances in satellite observation from platforms such as Landsat and TOPEX/Poseidon. Key organizing bodies included the International Geosphere-Biosphere Programme, the World Climate Research Programme, and national agencies like the Brazilian Institute of Geography and Statistics and the U.S. Agency for International Development. Early leadership and scientific coordination involved researchers associated with universities such as University of São Paulo, University of Maryland, College Park, and University of California, Berkeley.
LBA aimed to quantify fluxes of water, energy, carbon, trace gases, and aerosols between the Amazon Basin and the atmosphere while examining land-use change dynamics tied to actors like sugarcane, soybean, and cattle ranching expansion. Scientific questions included how altered vegetation cover influences regional climate linked to the South American Monsoon System, whether deforestation modifies carbon budgets relevant to the Intergovernmental Panel on Climate Change, and how fires associated with land management affect air quality monitored by satellites such as MODIS. The program also investigated interactions among biodiversity hotspots documented by organizations like the World Wildlife Fund and ecosystem services cited by the Convention on Biological Diversity.
LBA implemented nested, multi-scale studies combining ground plots, flux towers, aircraft campaigns, river monitoring, and satellite synthesis. Instruments included eddy-covariance towers for carbon fluxes used by teams from Wageningen University, atmospheric chemistry payloads on research aircraft operated by National Center for Atmospheric Research, and soil biogeochemistry labs at Smithsonian Tropical Research Institute. Remote sensing integration drew on data from NOAA, European Space Agency, and the Japan Aerospace Exploration Agency. Socioeconomic components used census and land-cover data from Instituto Nacional de Pesquisas Espaciais and field surveys conducted in municipalities such as Manaus and Altamira.
LBA produced evidence that intact tropical rainforest functions as a major carbon sink, with disturbance and selective logging reducing carbon residence times—findings discussed in reports to the Intergovernmental Panel on Climate Change and literature in journals associated with the American Geophysical Union. Results demonstrated that deforestation and fire increase emissions of carbon dioxide, methane, and aerosols measured during campaigns linked to TRACE-P and GTE. Studies described altered evapotranspiration affecting convective rainfall patterns connected to the South American Monsoon System and regional droughts similar to anomalies recorded during the 1997–98 El Niño. Riverine studies showed interactions among hydrology, sediment transport, and biogeochemical fluxes in the Amazon River consistent with observations by the Hydrological Sciences Journal community.
Findings informed policy dialogues involving the United Nations Framework Convention on Climate Change and national policy instruments in Brazil. Data from LBA underpinned monitoring approaches incorporated into initiatives by the Amazon Cooperation Treaty Organization and influenced conservation planning by NGOs including Conservation International and The Nature Conservancy. LBA outputs contributed to design and evaluation of payment for ecosystem services pilots in states such as Pará and recommendations for sustainable land-use practices cited in policy briefs by the World Bank and the Food and Agriculture Organization.
LBA convened universities, national research institutes, and international agencies: University of São Paulo, National Institute for Space Research (INPE), National Institute for Amazonian Research (INPA), University of Oxford, Imperial College London, Massachusetts Institute of Technology, Columbia University, and Max Planck Society groups. Funding sources included the National Science Foundation (United States), National Aeronautics and Space Administration, the European Commission, and Brazilian agencies such as the Brazilian Ministry of Science and Technology. Collaborative networks engaged regional governments of states like Amazonas (Brazilian state) and international partners from Germany, France, United Kingdom, and Japan.
LBA established long-term observatories and datasets that underpin contemporary programs such as the Grupo de Observadores do Clima initiatives, satellite missions by the European Space Agency, and modelling efforts within the Coupled Model Intercomparison Project. Its legacy includes methodological standards for flux measurements adopted by the FluxNet community, capacity-building through graduate training at institutions like Federal University of Amazonas, and data repositories accessed by global syntheses in journals led by the American Meteorological Society. Continued research extends LBA themes into studies of resilience, land-use transitions, and climate feedbacks involving partnerships with organizations such as the Green Climate Fund and regional initiatives coordinated by the Amazon Cooperation Treaty Organization.
Category:Amazon rainforest Category:Earth science experiments