Characterization of blackbody inhomogeneity and its effect on the retrieval results of the GLORIA instrument
2018
Abstract. Limb sounding instruments play an important role in the monitoring of climate
trends, as they provide a good vertical resolution. Traceability to the
International System of Units (SI) via onboard reference
or transfer standards is needed to compare trend estimates from multiple
instruments. This study investigates the required uncertainty of these
radiation standards to properly resolve decadal trends of climate-relevant
trace species like ozone, water vapor, and temperature distribution for the
Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA).
Temperature nonuniformities of the onboard reference blackbodies, used for
radiometric calibration, have an impact on the calibration uncertainty. The
propagation of these nonuniformities through the retrieval is analyzed. A
threshold for the maximum tolerable uncertainty of the blackbody temperature
is derived, so that climate trends can be significantly identified with
GLORIA.
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