The Orbiting Carbon Observatory (OCO-2): spectrometer performance evaluation using pre-launch direct sun measurements
By Christian Frankenberg, R. Pollock, R. Lee, R. Rosenberg, J. Blavier, David Crisp, Christopher W. O'Dell, G. Osterman, C. Roehl, Paul O. Wennberg and 1 more. 2014
152 citations recorded by the source corpus.
Abstract. The Orbiting Carbon Observatory-2 (OCO-2), launched on 2 July 2014, is a NASA mission designed to measure the column-averaged CO2 dry air mole fraction, XCO2. Towards that goal, it will collect spectra of reflected sunlight in narrow spectral ranges centered at 0.76, 1.6 and 2.0 μm with a resolving power (λ/Δ λ) of 20 000. These spectra will be used in an optimal estimation framework to retrieve XCO2. About 100 000 cloud free soundings of XCO2 each day will allow estimates of net CO2 fluxes on regional to continental scales to be determined. Here, we evaluate the OCO-2 spectrometer performance using pre-launch data acquired during instrument thermal vacuum tests in April 2012. A heliostat and a diffuser plate were used to feed direct sunlight into the OCO-2 instrument and spectra were recorded. These spectra were compared to those collected concurrently from a nearby high-resolution Fourier Transform Spectrometer that was part of the Total Carbon Column Observing Network (TCCON). Using the launch-ready OCO-2 calibration and spectroscopic parameters, we performed total column scaling fits to all spectral bands and compared these to TCCON results. On 20 April, we detected a CO2 plume from the Los Angeles basin at the JPL site with strongly enhanced short-term variability on the order of 1% (3–4 ppm). We also found good (
Subfields: Atmospheric Science, Global and Planetary Change, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/d800837ddfb505bbccbcc30db425da235a657ab2
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Citations in the corpus
- Modeling plant–water interactions: an ecohydrological overview from the cell to the global scale (2016, background): “Finally, anomalies of atmospheric CO2 concentration are an important source of information to estimate the net carbon uptake or release over very large areas and on the seasonal and annual time scale,(412,472,473) and they may become even more so in the future.(474)”
- Building the COllaborative Carbon Column Observing Network (COCCON): long-term stability and ensemble performance of the EM27/SUN Fourier transform spectrometer (2018, background): “TCCON stations are also the primary validation for OCO-2 (https://ocov2.jpl.nasa.gov/files/ocov2/OCO-2_ SciValPlan_111005_ver1_0_revA_final_signed1.pdf; last access: 4 March 2019), and validating the satellite observations at different locations is critical for the validation effort (Wunch et al., 2”