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| Total Carbon Column Observing Network | |
|---|---|
| Name | Total Carbon Column Observing Network |
| Formation | 2004 |
| Headquarters | Pasadena, California |
Total Carbon Column Observing Network is a global ground-based ensemble of high-precision spectroscopic observatories dedicated to measuring atmospheric column-averaged concentrations of carbon dioxide, methane, and related gases. The network provides long-term, high-accuracy observations that underpin planetary-scale studies by integrating data with satellite missions, climate models, and greenhouse gas inventories. It supports research tied to institutions and programs across atmospheric science, remote sensing, and environmental policy.
The network operates precision Fourier-transform and solar-viewing spectrometers at sites spanning urban, rural, polar, and marine environments, linking instruments housed at California Institute of Technology, Jet Propulsion Laboratory, National Oceanic and Atmospheric Administration, National Aeronautics and Space Administration, and Scripps Institution of Oceanography with observational efforts from Harvard University, Massachusetts Institute of Technology, University of Oxford, and University of Tokyo. Data products are compared with retrievals from satellite missions such as Orbiting Carbon Observatory-2, Greenhouse Gases Observing Satellite, Sentinel-5P, TanSat, and GOSAT-2 and assimilated into centers like European Centre for Medium-Range Weather Forecasts, National Centers for Environmental Prediction, and Global Carbon Project. The network contributes to assessments by the Intergovernmental Panel on Climate Change, supports national reporting linked to the United Nations Framework Convention on Climate Change, and informs initiatives involving World Meteorological Organization and International Geosphere-Biosphere Programme partners.
Origins trace to coordinated efforts among researchers at California Institute of Technology and Jet Propulsion Laboratory in the early 2000s to validate satellite retrievals following missions such as GOSAT. Early funding and programmatic support involved National Science Foundation, National Aeronautics and Space Administration, and international funding agencies including European Space Agency and Japan Aerospace Exploration Agency. Expansion phases aligned with launches of Orbiting Carbon Observatory-2 and GOSAT-2 and collaborations with projects at NOAA ESRL and observational programs managed by Scripps Institution of Oceanography. Key workshops convened at venues like American Geophysical Union meetings and sites hosted by World Climate Research Programme affiliates led to standardization efforts mirrored by laboratories such as National Institute of Standards and Technology and universities including University of Colorado Boulder and Carnegie Institution for Science.
Primary instruments include high-resolution solar-viewing Fourier-transform spectrometers, cavity ring-down spectrometers, and grating spectrometers deployed with sun-tracking systems developed by groups at Bruker, University of Toronto, and National Institute for Environmental Studies (Japan). Measurements rely on molecular spectroscopy databases maintained by HITRAN and processing algorithms derived from methods used in BIRA-IASB, Harvard-Smithsonian Center for Astrophysics, and instrument teams at ETH Zurich. Calibration approaches reference standards traceable to International System of Units laboratories such as NIST and intercomparison experiments with airborne platforms operated by NASA Ames Research Center and European Space Agency campaigns. The network leverages sunrise/sunset solar occultation and direct-sun absorption geometries similar to techniques used in observatories at Mauna Loa Observatory and Lauder Atmospheric Research Station.
Raw spectra undergo rigorous retrieval using community codes influenced by algorithms from ACOS and statistical frameworks pioneered at Jet Propulsion Laboratory, Karlsruhe Institute of Technology, and University of Bremen. Quality control practices mirror protocols from World Meteorological Organization and intercomparison exercises coordinated with International Atomic Energy Agency and regional calibration networks such as ICOS and NDACC. Uncertainty characterization employs traceability methods from National Physical Laboratory (UK) and error budgeting used in studies published by Proceedings of the National Academy of Sciences, Nature, and Journal of Geophysical Research. Data archives follow metadata standards promoted by Global Change Master Directory and are cross-referenced with inventories from Emissions Database for Global Atmospheric Research and national reporting to UNFCCC.
Site selection balances representativeness and logistical constraints, with locations operated by agencies and institutions including NOAA, Scripps Institution of Oceanography, University of Helsinki, Environment and Climate Change Canada, Commonwealth Scientific and Industrial Research Organisation, and Japan Meteorological Agency. Stations are co-located with observatories such as Mauna Loa Observatory, Barrow Observatory, Cape Grim, Izaña Atmospheric Observatory, and Ny-Ålesund, and integrated with networks like ICOS, AGAGE, and NDACC. Operational governance involves coordination among university consortia, national laboratories, and international bodies including World Meteorological Organization and Global Carbon Project, with data policy shaped by agreements similar to those governing Group on Earth Observations.
Observational records have quantified regional fluxes, validated satellite retrievals, and constrained inverse models used by teams at University of Edinburgh, Princeton University, Columbia University, and California Institute of Technology. Results have informed attribution studies tied to events such as regional biomass burning analyzed alongside datasets from MODIS, VIIRS, and ozone observations from OMI. Findings have appeared in journals including Nature Climate Change, Science, and Geophysical Research Letters, and contributed to synthesis reports by Intergovernmental Panel on Climate Change and policy assessments by International Energy Agency. Studies leveraging the network have elucidated seasonal cycles, urban enhancements observed in Los Angeles and Beijing, and long-term trends relevant to mitigation efforts led by institutions like Stanford University and Princeton University.
The network engages formal collaborations with NASA, NOAA, ESA, JAXA, European Commission projects, university groups at Massachusetts Institute of Technology, University of Cambridge, and University of Tokyo, and international research programs including ICOS and AGAGE. Partnerships extend to intercomparison campaigns with airborne platforms from NASA Langley Research Center, satellite teams at JAXA and JPL, and modeling centers such as European Centre for Medium-Range Weather Forecasts and National Center for Atmospheric Research. Capacity-building and training have involved workshops at American Geophysical Union meetings, summer schools organized by World Climate Research Programme, and technical exchanges with metrology institutes like NIST and National Physical Laboratory (UK).
Category:Atmospheric monitoring