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W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils
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| Zeitschriftentitel: | Journal of Atmospheric and Oceanic Technology |
|---|---|
| Personen und Körperschaften: | , , , , |
| In: | Journal of Atmospheric and Oceanic Technology, 36, 2019, 8, S. 1463-1476 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
American Meteorological Society
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| Schlagwörter: |
| author_facet |
Protat, Alain Rauniyar, Surendra Delanoë, Julien Fontaine, Emmanuel Schwarzenboeck, Alfons Protat, Alain Rauniyar, Surendra Delanoë, Julien Fontaine, Emmanuel Schwarzenboeck, Alfons |
|---|---|
| author |
Protat, Alain Rauniyar, Surendra Delanoë, Julien Fontaine, Emmanuel Schwarzenboeck, Alfons |
| spellingShingle |
Protat, Alain Rauniyar, Surendra Delanoë, Julien Fontaine, Emmanuel Schwarzenboeck, Alfons Journal of Atmospheric and Oceanic Technology W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils Atmospheric Science Ocean Engineering |
| author_sort |
protat, alain |
| spelling |
Protat, Alain Rauniyar, Surendra Delanoë, Julien Fontaine, Emmanuel Schwarzenboeck, Alfons 0739-0572 1520-0426 American Meteorological Society Atmospheric Science Ocean Engineering http://dx.doi.org/10.1175/jtech-d-18-0154.1 <jats:title>Abstract</jats:title><jats:p>Attenuation of the W-band (95 GHz) radar signal by atmospheric ice particles has long been neglected in cloud microphysics studies. In this work, 95-GHz airborne multibeam cloud radar observations in tropical stratiform ice anvils are used to estimate vertical profiles of 95-GHz attenuation. Two techniques are developed and compared, using very different assumptions. The first technique examines statistical reflectivity differences between repeated aircraft passes through the same cloud mass at different altitudes. The second technique exploits reflectivity differences between two different pathlengths through the same cloud, using the multibeam capabilities of the cloud radar. Using the first technique, the two-way attenuation coefficient produced by stratiform ice particles ranges between 1 and 1.6 dB km<jats:sup>−1</jats:sup> for reflectivities between 13 and 18 dB<jats:italic>Z</jats:italic>, with an expected increase of attenuation with reflectivity. Using the second technique, the multibeam results confirm these high attenuation coefficient values and expand the reflectivity range, with typical attenuation coefficient values of up to 3–4 dB km<jats:sup>−1</jats:sup> for reflectivities of 20 dB<jats:italic>Z</jats:italic>. The potential impact of attenuation on precipitating-ice-cloud microphysics retrievals is quantified using vertical profiles of the mean and the 99th percentile of ice water content derived from noncorrected and attenuation-corrected reflectivities. A large impact is found on the 99th percentile of ice water content, which increases by 0.3–0.4 g m<jats:sup>−3</jats:sup> up to 11-km height. Finally, T-matrix calculations of attenuation constrained by measured particle size distributions, ice crystal mass–size, and projected area–size relationships are found to largely underestimate cloud radar attenuation estimates.</jats:p> W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils Journal of Atmospheric and Oceanic Technology |
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10.1175/jtech-d-18-0154.1 |
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American Meteorological Society, 2019 |
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0739-0572 1520-0426 |
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Journal of Atmospheric and Oceanic Technology |
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| title |
W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_unstemmed |
W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_full |
W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_fullStr |
W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_full_unstemmed |
W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_short |
W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_sort |
w-band (95 ghz) radar attenuation in tropical stratiform ice anvils |
| topic |
Atmospheric Science Ocean Engineering |
| url |
http://dx.doi.org/10.1175/jtech-d-18-0154.1 |
| publishDate |
2019 |
| physical |
1463-1476 |
| description |
<jats:title>Abstract</jats:title><jats:p>Attenuation of the W-band (95 GHz) radar signal by atmospheric ice particles has long been neglected in cloud microphysics studies. In this work, 95-GHz airborne multibeam cloud radar observations in tropical stratiform ice anvils are used to estimate vertical profiles of 95-GHz attenuation. Two techniques are developed and compared, using very different assumptions. The first technique examines statistical reflectivity differences between repeated aircraft passes through the same cloud mass at different altitudes. The second technique exploits reflectivity differences between two different pathlengths through the same cloud, using the multibeam capabilities of the cloud radar. Using the first technique, the two-way attenuation coefficient produced by stratiform ice particles ranges between 1 and 1.6 dB km<jats:sup>−1</jats:sup> for reflectivities between 13 and 18 dB<jats:italic>Z</jats:italic>, with an expected increase of attenuation with reflectivity. Using the second technique, the multibeam results confirm these high attenuation coefficient values and expand the reflectivity range, with typical attenuation coefficient values of up to 3–4 dB km<jats:sup>−1</jats:sup> for reflectivities of 20 dB<jats:italic>Z</jats:italic>. The potential impact of attenuation on precipitating-ice-cloud microphysics retrievals is quantified using vertical profiles of the mean and the 99th percentile of ice water content derived from noncorrected and attenuation-corrected reflectivities. A large impact is found on the 99th percentile of ice water content, which increases by 0.3–0.4 g m<jats:sup>−3</jats:sup> up to 11-km height. Finally, T-matrix calculations of attenuation constrained by measured particle size distributions, ice crystal mass–size, and projected area–size relationships are found to largely underestimate cloud radar attenuation estimates.</jats:p> |
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| author | Protat, Alain, Rauniyar, Surendra, Delanoë, Julien, Fontaine, Emmanuel, Schwarzenboeck, Alfons |
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| description | <jats:title>Abstract</jats:title><jats:p>Attenuation of the W-band (95 GHz) radar signal by atmospheric ice particles has long been neglected in cloud microphysics studies. In this work, 95-GHz airborne multibeam cloud radar observations in tropical stratiform ice anvils are used to estimate vertical profiles of 95-GHz attenuation. Two techniques are developed and compared, using very different assumptions. The first technique examines statistical reflectivity differences between repeated aircraft passes through the same cloud mass at different altitudes. The second technique exploits reflectivity differences between two different pathlengths through the same cloud, using the multibeam capabilities of the cloud radar. Using the first technique, the two-way attenuation coefficient produced by stratiform ice particles ranges between 1 and 1.6 dB km<jats:sup>−1</jats:sup> for reflectivities between 13 and 18 dB<jats:italic>Z</jats:italic>, with an expected increase of attenuation with reflectivity. Using the second technique, the multibeam results confirm these high attenuation coefficient values and expand the reflectivity range, with typical attenuation coefficient values of up to 3–4 dB km<jats:sup>−1</jats:sup> for reflectivities of 20 dB<jats:italic>Z</jats:italic>. The potential impact of attenuation on precipitating-ice-cloud microphysics retrievals is quantified using vertical profiles of the mean and the 99th percentile of ice water content derived from noncorrected and attenuation-corrected reflectivities. A large impact is found on the 99th percentile of ice water content, which increases by 0.3–0.4 g m<jats:sup>−3</jats:sup> up to 11-km height. Finally, T-matrix calculations of attenuation constrained by measured particle size distributions, ice crystal mass–size, and projected area–size relationships are found to largely underestimate cloud radar attenuation estimates.</jats:p> |
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| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Rs1, DE-Pl11, DE-105, DE-14, DE-Ch1, DE-L229 |
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| spelling | Protat, Alain Rauniyar, Surendra Delanoë, Julien Fontaine, Emmanuel Schwarzenboeck, Alfons 0739-0572 1520-0426 American Meteorological Society Atmospheric Science Ocean Engineering http://dx.doi.org/10.1175/jtech-d-18-0154.1 <jats:title>Abstract</jats:title><jats:p>Attenuation of the W-band (95 GHz) radar signal by atmospheric ice particles has long been neglected in cloud microphysics studies. In this work, 95-GHz airborne multibeam cloud radar observations in tropical stratiform ice anvils are used to estimate vertical profiles of 95-GHz attenuation. Two techniques are developed and compared, using very different assumptions. The first technique examines statistical reflectivity differences between repeated aircraft passes through the same cloud mass at different altitudes. The second technique exploits reflectivity differences between two different pathlengths through the same cloud, using the multibeam capabilities of the cloud radar. Using the first technique, the two-way attenuation coefficient produced by stratiform ice particles ranges between 1 and 1.6 dB km<jats:sup>−1</jats:sup> for reflectivities between 13 and 18 dB<jats:italic>Z</jats:italic>, with an expected increase of attenuation with reflectivity. Using the second technique, the multibeam results confirm these high attenuation coefficient values and expand the reflectivity range, with typical attenuation coefficient values of up to 3–4 dB km<jats:sup>−1</jats:sup> for reflectivities of 20 dB<jats:italic>Z</jats:italic>. The potential impact of attenuation on precipitating-ice-cloud microphysics retrievals is quantified using vertical profiles of the mean and the 99th percentile of ice water content derived from noncorrected and attenuation-corrected reflectivities. A large impact is found on the 99th percentile of ice water content, which increases by 0.3–0.4 g m<jats:sup>−3</jats:sup> up to 11-km height. Finally, T-matrix calculations of attenuation constrained by measured particle size distributions, ice crystal mass–size, and projected area–size relationships are found to largely underestimate cloud radar attenuation estimates.</jats:p> W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils Journal of Atmospheric and Oceanic Technology |
| spellingShingle | Protat, Alain, Rauniyar, Surendra, Delanoë, Julien, Fontaine, Emmanuel, Schwarzenboeck, Alfons, Journal of Atmospheric and Oceanic Technology, W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils, Atmospheric Science, Ocean Engineering |
| title | W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_full | W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_fullStr | W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_full_unstemmed | W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_short | W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| title_sort | w-band (95 ghz) radar attenuation in tropical stratiform ice anvils |
| title_unstemmed | W-Band (95 GHz) Radar Attenuation in Tropical Stratiform Ice Anvils |
| topic | Atmospheric Science, Ocean Engineering |
| url | http://dx.doi.org/10.1175/jtech-d-18-0154.1 |