Advanced ground-based monitoring of stratospheric trace gas profiles: calibration, data analysis, and results

Gerd Hochschild; Hermann Berg; Gerhard Kopp; Richard Krupa; Martin Kuntz

doi:10.1117/12.319496

19 August 1998 Advanced ground-based monitoring of stratospheric trace gas profiles: calibration, data analysis, and results

Gerd Hochschild, Hermann Berg, Gerhard Kopp, Richard Krupa, Martin Kuntz

Author Affiliations +

Proceedings Volume 3503, Microwave Remote Sensing of the Atmosphere and Environment; (1998) https://doi.org/10.1117/12.319496
Event: Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 1998, Beijing, China

Abstract

The 268-280 GHz radiometer MIRA2 was constructed for ground- based monitoring of vertical profiles of minor stratospheric constituents and has been optimized especially for the observation of the extremely weak chlorine monoxide signature at 278 GHz and its diurnal variation. For calibration an adjustable internal load was developed, which provides any required brightness temperature from cryogenic to ambient temperatures, dependent on mechanical adjustment. In comparison to the well established external beam switching method this new technique result in a higher contrast in particular under critical conditions of the troposphere, For inversion of the measured spectra the modified Constrained Linear Inversion and the Optimal Estimation Method were used alternatively. The extensions of these well established methods include the fit of standing waves within the inversion process itself an the joint retrieval of several spectral lines. The advances in calibration and inversion techniques became obvious during the evaluation of the data measured at Kiruna, Sweden, 1996 and 1998, and Ny-Alesund, Svalbard, 1997. Profiles of the trace gases Ozone, N₂O, HNO₃ and ClO could be retrieved. From the data measured in Ny-Alesund a unique time series of ClO- and Ozone has been achieved which shows diurnal and long term variations of ClO and Ozone, respectively.

Citation Download Citation

Gerd Hochschild, Hermann Berg, Gerhard Kopp, Richard Krupa, and Martin Kuntz "Advanced ground-based monitoring of stratospheric trace gas profiles: calibration, data analysis, and results", Proc. SPIE 3503, Microwave Remote Sensing of the Atmosphere and Environment, (19 August 1998); https://doi.org/10.1117/12.319496

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