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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-181
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Jul 2018

Research article | 30 Jul 2018

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

Can turbulence within the field of view cause significant biases in radiative transfer modelling at the 183 GHz band?

Xavier Calbet1, Niobe Peinado-Galan2, Sergio DeSouza-Machado3, Emil Robert Kursinski4, Pedro Oria1, Dale Ward5, Angel Otarola6, Pilar Rípodas1, and Rigel Kivi7 Xavier Calbet et al.
  • 1AEMET, C/Leonardo Prieto Castro, 8, Ciudad Universitaria, 28071 Madrid, Spain
  • 2University of Valencia, Physics Faculty, Carrer del Dr. Moliner, 50, 46100 Burjassot, Valencia, Spain
  • 3JCET, University of Maryland, Baltimore County, Baltimore, Maryland, USA
  • 4Space Sciences and Engineering, Boulder, CO, USA
  • 5Hydrology and Atmospheric Sciences Department, University of Arizona, Tucson, AZ, USA
  • 6TMT International Observatory, Pasadena, CA, USA
  • 7Finnish Meteorological Institute Arctic Research Centre, Tähteläntie 62, 99600 Sodankylä, Finland

Abstract. The hypothesis whether turbulence within the passive microwave sounders field of view can cause significant biases in radiative transfer modelling at the 183GHz water vapour absorption band is tested. A novel method to calculate the effects of turbulence in radiative transfer modelling is presented. It is shown that the turbulent nature of water vapour in the atmosphere can be a critical component of radiative transfer modelling in this band. Radiative transfer simulations are performed comparing a uniform field with a turbulent one. These comparisons show frequency dependent biases which can scale up to several Kelvin in brightness temperature. These biases can match experimentally observed biases, such as the ones reported in Brogniez et al. (2016). Our simulations show that those biases could be explained as an effect of high intensity turbulence in the upper troposphere. This kind of turbulence is common in clear air turbulence, storm or cumulus cloud situations.

Xavier Calbet et al.
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Xavier Calbet et al.
Xavier Calbet et al.
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The hypothesis whether turbulence within the passive microwave sounders field of view can cause significant biases in radiative transfer modelling at the 183 GHz water vapour absorption band is tested. It is shown that this effect can cause significant biases, which can match the experimentally observed ones by Brogniez et al. (2016). They can be explained by locating intense turbulence in the high troposphere, such as the one present in clear air turbulence, cumulus clouds or storms.
The hypothesis whether turbulence within the passive microwave sounders field of view can cause...
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