OCO-2 Level 1B calibrated, geolocated calibration spectra, Retrospective Processing V11r (OCO2_L1B_Calibration) at GES DISC

Description

Version 11r is the current version of the data set. Older versions will no longer be available and are superseded by Version 11r. The Orbiting Carbon Observatory is the first NASA missiondesigned to collect space-based measurements of atmospheric carbon dioxidewith the precision, resolution, and coverage needed to characterize theprocesses controlling its buildup in the atmosphere. The OCO-2 project uses the LEOStar-2 spacecraft that carries a single instrument. It incorporates three high-resolution spectrometers that make coincident measurements ofreflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and inmolecular oxygen (O2) A-Band at 0.76 micrometers. The three spectrometers have different characteristics and are calibrated independently. Their raw data numbers (DN) are delivered correlated in time tothe Level 1B process as Level 1A products. Each band has 1016 spectralelements, although some are masked out in the L2 retrieval.This L1B product results from calibration mode measurements (e.g., Lunar,Solar, Dark observations), and thus it differs from the OCO2_L1B_Science(L1bSc) product. The differences in the product formats are only in the geolocation information provided. Whereas the L1bSc products report geolocation data for each sounding, calibration products report the directionof the boresight vector.This is the retrospective processing where the calibration data is estimated from the full timeseries of data (before, during, and after the measurements), and is expected to be of slightly higher quality.

Resources

Name Format Description Link
21 Access the dataset landing page from the GES DISC website. https://disc.gsfc.nasa.gov/datacollection/OCO2_L1B_Calibration_11r.html
21 OCO-2 Project Home Page https://ocov2.jpl.nasa.gov/
21 Access the data via HTTP. https://oco2.gesdisc.eosdis.nasa.gov/data/OCO2_DATA/OCO2_L1B_Calibration.11r/
33 README document. https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/README.OCO2.pdf
22 OCO2_L1B_Calibration_8r.jpeg https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/OCO2_L1B_Calibration_8r.jpeg
21 Access the data via the OPeNDAP protocol. https://oco2.gesdisc.eosdis.nasa.gov/opendap/OCO2_L1B_Calibration.11r/contents.html
21 Subset recipe using OPeNDAP https://disc.gsfc.nasa.gov/information/howto?title=How+to+download+a+spatial+and+variable+subset+of+Level+1B+data+using+OPeNDAP
21 OCO-2 Documentation https://disc.gsfc.nasa.gov/information/documents?title=OCO-2+Documents
33 USER'S GUIDE https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/OCO2_OCO3_B10_DUG.pdf
21 Publications from the Science Team https://ocov2.jpl.nasa.gov/science/publications/
33 Level 1B Software Interface Specification containing description of all data objects in data files https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/SDOS_SIS_L1b.V7.pdf
21 OCO-2 Data Gaps https://disc.gsfc.nasa.gov/information/documents?title=OCO+Known+Data+Issues
21 Use the Earthdata Search to find and retrieve data sets across multiple data centers. https://search.earthdata.nasa.gov/search?q=OCO2_L1B_Calibration
33 Level 1B Algorithm Theoretical Basis (ATBD) https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/OCO_L1B_ATBD.pdf
21 This software (NASA NTR-49044) retrieves a set of atmospheric/surface/instrument parameters from a simultaneous fit to spectra from multiple absorption bands. The software uses an iterative, non-linear retrieval technique (optimal estimation). After the retrieval process has converged, the software performs an error analysis. The products of the software include all quantities needed to understand the information content of the measurement, its uncertainty, and its dependence on interfering atmospheric properties. Jet Propulsion Laboratory, California Institute of Technology. Copyright 2016 California Institute of Technology. U.S. Government sponsorship acknowledged. https://github.com/nasa/RtRetrievalFramework

Tags

  • infrared-wavelengths
  • atmosphere
  • atmospheric-chemistry
  • spectral-engineering
  • earth-science

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