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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2018-66
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
08 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Assessment of GNSS radio occultation refractivity under heavy precipitation
Ramon Padullés1,2, Estel Cardellach2, Kuo-Nung Wang1, Chi O. Ao1, F. Joseph Turk1, and Manuel de la Torre-Juárez1 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
2Institut de Ciències de l’Espai (IEEC-CSIC), Barcelona, Spain
Abstract. A positive bias at heights between 3 and 8 km has been observed when comparing the radio occultation retrieved refractivity with that of meteorological analyses and re-analyses, in cases where heavy precipitation is present. The effect of precipitation in RO retrievals has been investigated as a potential cause of the bias, using precipitation measurements interpolated into the actual three dimensional RO raypaths to calculate the excess phase induced by precipitation. The study consisted in comparing the retrievals when such extra delay is removed from the actual measurement and when it is not. The results show how precipitation itself is not the cause of the positive bias. Instead, we show that the positive bias is linked to high specific humidity conditions regardless of precipitation. This study also shows a regional dependence of the bias. Furthermore, different analyses and re-analyses show a disagreement under high specific humidity conditions and in consequence, heavy precipitation.
Citation: Padullés, R., Cardellach, E., Wang, K.-N., Ao, C. O., Turk, F. J., and de la Torre-Juárez, M.: Assessment of GNSS radio occultation refractivity under heavy precipitation, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2018-66, in review, 2018.
Ramon Padullés et al.
Ramon Padullés et al.
Ramon Padullés et al.

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In this paper we have assessed the positive difference observed between Radio Occultations retrieved refractivity and that of weather analyses and re-analyses when heavy precipitation is present. The impact of the precipitation media into the refractivity observable has been evaluated, showing that precipitation itself cannot explain the magnitude of the observed difference. Instead, the difference is shown to be linked with high specific humidity conditions, which in turn are linked with rain.
In this paper we have assessed the positive difference observed between Radio Occultations...
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