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Characterization of anthropogenic methane plumes with the Hyperspectral Thermal Emission Spectrometer (HyTES): a retrieval method and error analysis

  • Miller C
  • Worden J
  • Hulley G
  • et al.
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Abstract

<p><strong>Abstract.</strong> We introduce a retrieval algorithm to estimate lower tropospheric methane (CH<sub>4</sub>) concentrations from the surface to 1<span class="thinspace"></span>km with uncertainty estimates using Hyperspectral Thermal Emission Spectrometer (HyTES) airborne radiance measurements. After resampling, retrievals have a spatial resolution of 6 × 6<span class="thinspace"></span>m<sup>2</sup>. The total error from a single retrieval is approximately 20<span class="thinspace"></span>%, with the uncertainties determined primarily by noise and spectral interferences from air temperature, surface emissivity, and atmospheric water vapor. We demonstrate retrievals for a HyTES flight line over storage tanks near Kern River Oil Field (KROF), Kern County, California, and find an extended plume structure in the set of observations with elevated methane concentrations (3.0 ± 0.6 to 6.0 ± 1.2<span class="thinspace"></span>ppm), well above mean concentrations (1.8 ± 0.4<span class="thinspace"></span>ppm) observed for this scene. With typically a 20<span class="thinspace"></span>% estimated uncertainty, plume enhancements with more than 1<span class="thinspace"></span>ppm are distinguishable from the background values with its uncertainty. HyTES retrievals are consistent with simultaneous airborne and ground-based in situ CH<sub>4</sub> mole fraction measurements within the reported accuracy of approximately 0.2<span class="thinspace"></span>ppm (or ∼ 8<span class="thinspace"></span>%), due to retrieval interferences related to air temperature, emissivity, and H<sub>2</sub>O.</p>

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APA

Miller, C. E., Worden, J. R., Hulley, G. C., Hook, S. J., Kuai, L., Li, K.-F., … Aubrey, A. D. (2016). Characterization of anthropogenic methane plumes with the Hyperspectral Thermal Emission Spectrometer (HyTES): a retrieval method and error analysis. Atmospheric Measurement Techniques, 9(7), 3165–3173. https://doi.org/10.5194/amt-9-3165-2016

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