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https://doi.org/10.5194/amt-2017-370
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
06 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Water Vapor Retrieval using the Precision Solar Spectroradiometer
Panagiotis-Ioannis Raptis1,2, Stelios Kazadzis1, Julian Gröbner1, Natalia Kouremeti1, Lionel Doppler3, Ralf Becker3, and Constantinos Helmis2 1Physikalisch-Meteorologisches Observatorium Davos-World Radiation Center (PMOD-WRC), Davos, Switzerland
2University of Athens, Department of Physics, Athens, Greece
3Deutscher Wetterdienst, Meteorologisches Observatorium Lindenberg – Richard Assmann Observatorium (DWD, MOL-RAO), Lindenberg (Tauche), Germany
Abstract. The Precision Solar SpectroRadiometer (PSR) is a new spectroradiometer developed at Physikalisch-Meteorologisches Observatorium Davos-World Radiation Center (PMOD-WRC), Davos, measuring Direct Solar Irradiance at the surface, in the 300–1020 nm spectral range at high temporal resolution. The purpose of this work is to investigate the instrument's potential of retrieving Integrated Water Vapor (IWV) using its spectral measurements. Two different approaches were developed in order to retrieve IWV, the first one using single channel/wavelength measurements, following a theoretical water vapor high absorption wavelength, and the second one using direct sun irradiance integrated at a certain spectral region. IWV results have been validated using a 2-year dataset, consisting of an AERONET sun- photometer Cimel CE318, a Global Positioning System (GPS), a Microwave Radiometer Profiler (MWP) and radiosonde retrievals recorded at Meteorological Observatorium Lindenberg, Germany. For the monochromatic approach, better agreement with retrievals from other methods/instruments was achieved using the 946 nm channel, while for the spectral approach using the 934–948 nm window. Compared to other instruments' retrievals, the monochromatic approach leads to mean relative differences up to 3.3 % with the coefficient of determination (R2) being in the region of 0.87–0.95, while for the spectral approach mean relative differences up to 0.7 % were recorded with R2 in the region of 0.96–0.98. Uncertainties related to IWV retrieval methods were investigated and found to be less than 0.28 cm for both methods. Absolute IWV deviations of differences between PSR and other instruments were determined the range of 0.08–0.30 cm and only in extreme cases would reach up to 15 %.

Citation: Raptis, P.-I., Kazadzis, S., Gröbner, J., Kouremeti, N., Doppler, L., Becker, R., and Helmis, C.: Water Vapor Retrieval using the Precision Solar Spectroradiometer, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-370, in review, 2017.
Panagiotis-Ioannis Raptis et al.
Panagiotis-Ioannis Raptis et al.
Panagiotis-Ioannis Raptis et al.

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Short summary
The purpose of this work is to retrieve Integrated Water Vapor using spectral measurements from Precision Solar SpectroRadiometer (PSR). Two different approaches were developed one using single channel direct sun irradiance measurements, and the second one integrating at a certain spectral region. The results of the spectral approach are closer to the retrievals of non photometric techniques (GPS, Microwave radiometer and radiosondes), suggesting this method provide more accurate IWV product.
The purpose of this work is to retrieve Integrated Water Vapor using spectral measurements from...
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