Calibrating ground‐based microwave radiometers: Uncertainty and drifts

Küchler, N.; Turner, D. D.; Löhnert, U.; Crewell, S.

doi:10.1002/2015RS005826

Title: Calibrating ground‐based microwave radiometers: Uncertainty and drifts

Journal Article · Thu Apr 21 00:00:00 EDT 2016 · Radio Science

DOI:https://doi.org/10.1002/2015RS005826· OSTI ID:1402529

Küchler, N. ^[1]; Turner, D. D. ^[2]; Löhnert, U. ^[1]; Crewell, S. ^[1]

Institute for Geophysics and Meteorology University of Cologne Cologne Germany
NOAA National Severe Storms Laboratory Forecast Research and Development Division Oklahoma USA

Abstract The quality of microwave radiometer (MWR) calibrations, including both the absolute radiometric accuracy and the spectral consistency, determines the accuracy of geophysical retrievals. The Microwave Radiometer Calibration Experiment (MiRaCalE) was conducted to evaluate the performance of MWR calibration techniques, especially of the so‐called Tipping Curve Calibrations (TCC) and Liquid Nitrogen Calibrations (LN2cal), by repeatedly calibrating a fourth‐generation Humidity and Temperature Profiler (HATPRO‐G4) that measures downwelling radiance between 20 GHz and 60 GHz. MiRaCalE revealed two major points to improve MWR calibrations: (i) the necessary repetition frequency for MWR calibration techniques to correct drifts, which ensures stable long‐term measurements; and (ii) the spectral consistency of control measurements of a well known reference is useful to estimate calibration accuracy. Besides, we determined the accuracy of the HATPRO's liquid nitrogen‐cooled blackbody's temperature. TCCs and LN2cals were found to agree within 0.5 K when observing the liquid nitrogen‐cooled blackbody with a physical temperature of 77 K. This agreement of two different calibration techniques suggests that the brightness temperature of the LN2 cooled blackbody is accurate within at least 0.5 K, which is a significant reduction of the uncertainties that have been assumed to vary between 0.6 K and 1.5 K when calibrating the HATPRO‐G4. The error propagation of both techniques was found to behave almost linearly, leading to maximum uncertainties of 0.7 K when observing a scene that is associated with a brightness temperature of 15 K.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0008830

OSTI ID:: 1402529

Journal Information:: Radio Science, Journal Name: Radio Science Vol. 51 Journal Issue: 4; ISSN 0048-6604

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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