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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-237
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-237
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 17 Sep 2019

Submitted as: research article | 17 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Calibration and Validation of the Polarimetric Radio Occultation and Heavy Precipitation experiment Aboard the PAZ Satellite

Ramon Padullés1, Chi O. Ao1, F. Joseph Turk1, Manuel de la Torre Juárez1, Byron Iijima1, Kuo-Nung Wang2,1, and Estel Cardellach3 Ramon Padullés et al.
  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, CA, 91109
  • 2Scripps Institution of Oceanography, La Jolla, San Diego, CA
  • 3Institut de Ci‘encies de l’Espai, Consejo Superior de Investigaciones Científicas, Institut d’Estudis Espacials de Catalunya

Abstract. This manuscript presents the calibration and validation studies for the Radio Occultations and Heavy Precipitation experiment aboard the PAZ satellite. These studies, necessary to assess and characterize the noise level and robustness of the ΔΦ observable of Polarimetric Radio Occultations (PRO), confirm the good performance of the experiment and the capability of this technique in sensing precipitation. It is shown how all the predicted effects that could have an impact into the PRO observables (e.g. effect of metallic structures nearby the antenna, the Faraday Rotation at the ionosphere, signal impurities in the transmission, altered cross polarization isolation, etc.) are effectively calibrated and corrected, and they have a negligible effect into the final observable. The on-orbit calibration, performed using an extensive dataset of free-of-rain and low ionospheric activity observations, is successfully used to correct all the collected observations, which are further validated against independent precipitation observations confirming the sensitivity of the observables to the presence of hydrometeors. The validation results also show how vertically averaged ΔΦ can be used as a proxy for precipitation.

Ramon Padullés et al.
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Short summary
In this study we thoroughly address the calibration and validation of the new Polarimetric Radio Occultation (PRO) observables. These represent an innovative way to obtain vertical profiles of precipitation along with thermodynamic observations of the same scene. First we perform the on-orbit calibration of the measurement. Then, we show how the PRO observables are sensitive to the presence and intensity of rain, by looking for coincident precipitation measurements from independent missions.
In this study we thoroughly address the calibration and validation of the new Polarimetric Radio...
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