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Journal of Applied Meteorology and Climatology

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Editorial Type:
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Article Type:
Research Article

The Measured Relationship between Ice Water Content and Cloud Radar Reflectivity in Tropical Convective Clouds

A. Protat Research and Development Branch, Australian Bureau of Meteorology, Melbourne, Victoria, Australia

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J. Delanoë Laboratoire des Atmosphère Milieux Observations Spatiales (LATMOS), Guyancourt, France

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J. W. Strapp Met Analytics Inc., Toronto, Ontario, Canada

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E. Fontaine Laboratoire de Météorologie Physique (LaMP), Université Blaise Pascal, Clermont-Ferrand, France

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D. Leroy Laboratoire de Météorologie Physique (LaMP), Université Blaise Pascal, Clermont-Ferrand, France

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A. Schwarzenboeck Laboratoire de Météorologie Physique (LaMP), Université Blaise Pascal, Clermont-Ferrand, France

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L. Lilie Science Engineering Associates, Mansfield Center, Connecticut

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C. Davison National Research Council Canada, Ottawa, Ontario, Canada

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F. Dezitter Airbus, Inc., Toulouse, France

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A. Grandin Airbus, Inc., Toulouse, France

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M. Weber Airbus, Inc., Toulouse, France

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Print Publication:
01 Aug 2016
DOI:
https://doi.org/10.1175/JAMC-D-15-0248.1
Page(s):
1707–1729
Restricted access

Abstract

In this paper, unprecedented bulk measurements of ice water content (IWC) up to approximately 5 g m−3 and 95-GHz radar reflectivities Z95 are used to analyze the statistical relationship between these two quantities and its variability. The unique aspect of this study is that these IWC–Z95 relationships do not use assumptions on cloud microphysics or backscattering calculations. IWCs greater than 2 g m−3 are also included for the first time in such an analysis, owing to improved bulk IWC probe technology and a flight program targeting high ice water content. Using a single IW–Z95 relationship allows for the retrieval of IWC from radar reflectivities with less than 30% bias and 40%–70% rms difference. These errors can be reduced further, down to 10%–20% bias over the whole IWC range, using the temperature variability of this relationship. IWC errors largely increase for Z95 > 16 dBZ, as a result of the distortion of the IWC–Z95 relationship by non-Rayleigh scattering effects. A nonlinear relationship is proposed to reduce these errors down to 20% bias and 20%–35% rms differences. This nonlinear relationship also outperforms the temperature-dependent IWC–Z95 relationship for convective profiles. The joint frequency distribution of IWC and temperature within and around deep tropical convective cores shows that at the −50° ± 5°C level, the cruise altitude of many commercial jet aircraft, IWCs greater than 1.5 g m−3 were found exclusively in convective profiles.

Corresponding author address: Alain Protat, Australian Bureau of Meteorology, 700 Collins St., Docklands, Melbourne, VIC 3008, Australia. E-mail: a.protat@bom.gov.au

Abstract

In this paper, unprecedented bulk measurements of ice water content (IWC) up to approximately 5 g m−3 and 95-GHz radar reflectivities Z95 are used to analyze the statistical relationship between these two quantities and its variability. The unique aspect of this study is that these IWC–Z95 relationships do not use assumptions on cloud microphysics or backscattering calculations. IWCs greater than 2 g m−3 are also included for the first time in such an analysis, owing to improved bulk IWC probe technology and a flight program targeting high ice water content. Using a single IW–Z95 relationship allows for the retrieval of IWC from radar reflectivities with less than 30% bias and 40%–70% rms difference. These errors can be reduced further, down to 10%–20% bias over the whole IWC range, using the temperature variability of this relationship. IWC errors largely increase for Z95 > 16 dBZ, as a result of the distortion of the IWC–Z95 relationship by non-Rayleigh scattering effects. A nonlinear relationship is proposed to reduce these errors down to 20% bias and 20%–35% rms differences. This nonlinear relationship also outperforms the temperature-dependent IWC–Z95 relationship for convective profiles. The joint frequency distribution of IWC and temperature within and around deep tropical convective cores shows that at the −50° ± 5°C level, the cruise altitude of many commercial jet aircraft, IWCs greater than 1.5 g m−3 were found exclusively in convective profiles.

Corresponding author address: Alain Protat, Australian Bureau of Meteorology, 700 Collins St., Docklands, Melbourne, VIC 3008, Australia. E-mail: a.protat@bom.gov.au
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