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| Large-Scale Biosphere–Atmosphere Experiment in Amazonia (LBA) | |
|---|---|
| Name | Large-Scale Biosphere–Atmosphere Experiment in Amazonia |
| Established | 1990s |
| Location | Amazon Basin |
Large-Scale Biosphere–Atmosphere Experiment in Amazonia (LBA) was a multidisciplinary research initiative focused on understanding the interactions between the Amazon Basin biosphere and the Earth atmosphere at regional to continental scales. The program brought together researchers from institutions such as the National Aeronautics and Space Administration and the National Institute for Space Research (Brazil), integrated field campaigns across nations including Brazil, Peru, and Bolivia, and aimed to inform international processes like the United Nations Framework Convention on Climate Change. LBA combined observations, experiments, and models to study how land-use change, climate variability, and biogeochemical cycles affect atmospheric composition and hydrology across the Amazon rainforest.
LBA originated from scientific discussions at venues including the International Geosphere-Biosphere Programme and the World Climate Research Programme and was influenced by workshops convened by the National Oceanic and Atmospheric Administration and the European Space Agency. Primary objectives included quantifying carbon budgets for the Amazon Basin, characterizing evapotranspiration and precipitation links with the South American Monsoon System, and assessing effects of deforestation related to policies enacted in capitals such as Brasília and regional centers like Manaus. The experiment targeted drivers spanning from seasonal variability influenced by the El Niño–Southern Oscillation to long-term changes associated with greenhouse gas forcing discussed at the Intergovernmental Panel on Climate Change.
LBA was coordinated through a network of research programs and agencies, including the Brazilian National Research Council, National Science Foundation, Swiss Federal Institute of Technology in Zurich, and the German Research Foundation. Governance structures involved steering committees with representatives from universities such as the University of São Paulo, the Massachusetts Institute of Technology, and research institutes including the Woods Hole Research Center; funding came from national agencies and international partners like the European Commission and philanthropic bodies modeled after foundations like the Gordon and Betty Moore Foundation. Collaborative partnerships extended to regional agencies in Colombia, Venezuela, and Guyana for field logistics and permitting.
The experimental design integrated observational networks, manipulative experiments, and remote sensing studies coordinated with platforms such as the Landsat and MODIS satellites and aircraft from NASA Ames Research Center. Components included flux towers measuring carbon and water exchange based on eddy covariance techniques standardized across sites like those operated by the RAPID-EC and networks linked to the FluxNet community, soil respiration plots, throughfall collectors, and stream gauging stations coordinated with hydrologic teams from the International Hydrological Programme. Manipulative experiments addressed fire regimes informed by historical records and regional practices from municipalities such as Altamira.
LBA produced influential results on carbon dynamics, showing that areas of the Amazon rainforest could shift from carbon sinks to sources under extensive deforestation and drought patterns associated with El Niño. Studies quantified large regional emissions of carbon dioxide and methane influencing analyses at the Intergovernmental Panel on Climate Change, and documented how biomass burning from agricultural frontiers near Pará altered atmospheric aerosol loading and cloud microphysics studied in conjunction with teams from the Max Planck Institute for Chemistry. Research also advanced understanding of the role of Amazonian evapotranspiration in sustaining the South American Monsoon System and provided data used in ensembles for the Coupled Model Intercomparison Project.
Field sites spanned diverse ecoregions and administrative units including research stations near Manaus, experimental forests in Rondônia, varzea floodplains along the Amazon River, and Andean foothill plots in Loreto (Peru). Regional studies targeted interactions between land-cover mosaics in frontier zones around cities such as Santarém and indigenous territories where land management practices intersected with conservation efforts led by organizations like FUNAI. Collaborative stations included university-managed sites at the INPA campus and long-term ecological research plots affiliated with the Long Term Ecological Research Network.
LBA established data repositories and standardized protocols for metadata shared among institutions including the National Center for Atmospheric Research, the Centro de Ciência do Sistema Terrestre (INPE), and international modeling centers such as the Hadley Centre. Data products informed dynamic vegetation models developed at centers like the Carnegie Institution for Science and coupled climate models from the Geophysical Fluid Dynamics Laboratory, and were integrated into continental-scale analyses used by the World Meteorological Organization. Emphasis on open data facilitated syntheses and meta-analyses published in journals associated with the American Geophysical Union and the Royal Society.
Findings from LBA informed national policy debates in Brazil on land-use planning, supported environmental assessments used by agencies like the Ministry of Environment (Brazil), and contributed evidence for international negotiations at the Conference of the Parties to the UNFCCC. Outreach programs engaged stakeholders including municipal governments in Belém, non-governmental organizations such as Conservation International and World Wildlife Fund, and indigenous organizations to translate scientific results into resource-management options. Educational initiatives partnered with universities including the Federal University of Amazonas to train a generation of scientists and policy analysts.
LBA faced logistical challenges across sovereign territories involving permits from agencies like IBAMA and coordination with local communities, and controversies arose over land-use research implications for agribusiness interests represented in state assemblies. Scientific debates included interpretation of carbon balance results contested by researchers at institutions such as the University of Leeds and methodological disputes over upscaling point measurements to the basin scale used in studies by the IPCC community. Ethical concerns about data sovereignty and benefit sharing prompted revisions to collaboration agreements with indigenous groups and national partners.
Category:Amazon Rainforest Category:Climate research programs Category:Ecology studies