OCO-2 Level 1B calibrated, geolocated science spectra, Retrospective Processing V10r (OCO2_L1B_Science) at GES DISC

Description

Version 10r is the current version of the data set. Older versions will no longer be available and are superseded by Version 10r. In early 2021, the OCO Team identified an issue with OCO-2 level 2 products processed since January 28, 2020. The Ancillary Geometric Product (AGAP) file, a static file used in OCO-2 Geolocation processing, was inadvertently replaced with an obsolete version. This AGAP file included a ~300 m pointing error. As a result, all OCO-2 Level 2, version 10r, data files for the period January 28 - December 31, 2020, were corrected and replaced. The replacement process was completed by the end of June, 2021. The significance of this error has been described in Kiel et al. (2019; doi:10.5194/amt-12-2241-2019). The Orbiting Carbon Observatory is the first NASA mission designed to collect space-based measurements of atmospheric carbon dioxide with the precision, resolution, and coverage needed to characterize the processes 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 of reflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and in molecular 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 to the Level 1B process as Level 1A products. Each band has 1016 spectral elements, although some are masked out in the L2 retrieval.This product is the output from the Level 1B process. It converts the raw instrument data numbers into calibrated radiances. This conversion is based upon files of instrument characteristics and algorithm parameters that may vary over time. In addition to calibrated radiances, the Level 1B output products have geolocation information recorded for each measurement for use in higher-level processes. 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
22 OCO2_L1B_Science_8r.jpeg https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/OCO2_L1B_Science_8r.jpeg
21 Use the Earthdata Search to find and retrieve data sets across multiple data centers. https://search.earthdata.nasa.gov/search?q=OCO2_L1B_Science
21 Access the data via the OPeNDAP protocol. https://oco2.gesdisc.eosdis.nasa.gov/opendap/OCO2_L1B_Science.10r/contents.html
21 OCO-2 Project Home Page https://ocov2.jpl.nasa.gov/
33 Level 1B Algorithm Theoretical Basis (ATBD) https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/OCO_L1B_ATBD.pdf
33 README document. https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/README.OCO2.pdf
33 USER'S GUIDE https://docserver.gesdisc.eosdis.nasa.gov/public/project/OCO/OCO2_OCO3_B10_DUG.pdf
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 Publications from the Science Team https://ocov2.jpl.nasa.gov/science/publications/
21 OCO-2 Data Gaps https://disc.gsfc.nasa.gov/information/documents?title=OCO+Known+Data+Issues
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2F6O3GEUK7U2JG
21 Access the data via HTTP. https://oco2.gesdisc.eosdis.nasa.gov/data/OCO2_DATA/OCO2_L1B_Science.10r/
21 OCO-2 Documentation https://disc.gsfc.nasa.gov/information/documents?title=OCO-2+Documents
21 Access the dataset landing page from the GES DISC website. https://disc.gsfc.nasa.gov/datacollection/OCO2_L1B_Science_10r.html
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 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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