A222-0006
Spectral Calibration of the MethaneAIR Instrument

Wednesday, 16 December 2020
Poster
Carly Staebell1, Kang Sun1,2, Jenna Samra3, Jonathan E Franklin4, Christopher Chan Miller3, Xiong Liu3, Kelly Chance3 and Steven C Wofsy5, (1)University at Buffalo, Department of Civil, Structural and Environmental Engineering, Buffalo, NY, United States, (2)University at Buffalo, RENEW Institute, Buffalo, NY, United States, (3)Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States, (4)Harvard University, Cambridge, MA, United States, (5)Harvard University, John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA, United States
Abstract:
MethaneAIR is the airborne simulator of MethaneSAT, an area-mapping satellite currently in development with the goal of locating and quantifying anthropogenic sources of methane worldwide. The MethaneAIR spectrometer measures radiance in the short-wave infrared spectral range, where the instrument spectral response function (ISRF) must be known with a high degree of accuracy. To this end, on-ground laboratory measurements were taken by scanning a tunable laser across the detector within the CH4 (1593-1679 nm) and O2 (1249-1317 nm) bands. Stray light was characterized and a correction algorithm was applied through FFT-based Van Cittert deconvolution. Wavelength registration was examined and found to be best described by a linear relationship for both bands with precision of ~0.01 spectral pixel. The instrument spectral spread function (ISSF), measured with fine wavelength steps of 0.005 nm near 10 central wavelengths across each band, was oversampled to construct the ISRF at a given wavelength and spatial pixel. The ISRFs were then smoothed with a Savitzky-Golay filter for use in a lookup table in the retrieval algorithm.
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