Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds
Retrievals of ice-cloud properties from cloud-radar observations are challenging because the retrieval methods are typically underdetermined. Here, the authors investigate whether additional information can be obtained from higher-order moments and the slopes of the radar Doppler spectrum such as sk...
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AMER METEOROLOGICAL SOC
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:24050 2023-05-15T14:25:34+02:00 Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds Maahn, Maximilian Loehnert, Ulrich 2017 https://kups.ub.uni-koeln.de/24050/ eng eng AMER METEOROLOGICAL SOC Maahn, Maximilian orcid:0000-0002-2580-9100 and Loehnert, Ulrich (2017). Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds. J. Appl. Meteorol. Climatol., 56 (2). S. 263 - 283. BOSTON: AMER METEOROLOGICAL SOC. ISSN 1558-8432 ddc:no doc-type:article publishedVersion 2017 ftubkoeln 2022-11-09T07:19:34Z Retrievals of ice-cloud properties from cloud-radar observations are challenging because the retrieval methods are typically underdetermined. Here, the authors investigate whether additional information can be obtained from higher-order moments and the slopes of the radar Doppler spectrum such as skewness and kurtosis as well as the slopes of the Doppler peak. To estimate quantitatively the additional information content, a generalized Bayesian retrieval framework that is based on optimal estimation is developed. Real and synthetic cloud-radar observations of the Indirect and Semi-Direct Aerosol Campaign (ISDAC) dataset obtained around Barrow, Alaska, are used in this study. The state vector consists of the microphysical (particle-size distribution, mass-size relation, and cross section-area relation) and kinematic (vertical wind and turbulence) quantities required to forward model the moments and slopes of the radar Doppler spectrum. It is found that, for a single radar frequency, more information can be retrieved when including higher-order moments and slopes than when using only reflectivity and mean Doppler velocity but two radar frequencies. When using all moments and slopes with two or even three frequencies, the uncertainties of all state variables, including the mass-size relation, can be considerably reduced with respect to the prior knowledge. Article in Journal/Newspaper Arctic Arctic Barrow Alaska Cologne University: KUPS Arctic |
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Cologne University: KUPS |
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language |
English |
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ddc:no Maahn, Maximilian Loehnert, Ulrich Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds |
topic_facet |
ddc:no |
description |
Retrievals of ice-cloud properties from cloud-radar observations are challenging because the retrieval methods are typically underdetermined. Here, the authors investigate whether additional information can be obtained from higher-order moments and the slopes of the radar Doppler spectrum such as skewness and kurtosis as well as the slopes of the Doppler peak. To estimate quantitatively the additional information content, a generalized Bayesian retrieval framework that is based on optimal estimation is developed. Real and synthetic cloud-radar observations of the Indirect and Semi-Direct Aerosol Campaign (ISDAC) dataset obtained around Barrow, Alaska, are used in this study. The state vector consists of the microphysical (particle-size distribution, mass-size relation, and cross section-area relation) and kinematic (vertical wind and turbulence) quantities required to forward model the moments and slopes of the radar Doppler spectrum. It is found that, for a single radar frequency, more information can be retrieved when including higher-order moments and slopes than when using only reflectivity and mean Doppler velocity but two radar frequencies. When using all moments and slopes with two or even three frequencies, the uncertainties of all state variables, including the mass-size relation, can be considerably reduced with respect to the prior knowledge. |
format |
Article in Journal/Newspaper |
author |
Maahn, Maximilian Loehnert, Ulrich |
author_facet |
Maahn, Maximilian Loehnert, Ulrich |
author_sort |
Maahn, Maximilian |
title |
Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds |
title_short |
Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds |
title_full |
Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds |
title_fullStr |
Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds |
title_full_unstemmed |
Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds |
title_sort |
potential of higher-order moments and slopes of the radar doppler spectrum for retrieving microphysical and kinematic properties of arctic ice clouds |
publisher |
AMER METEOROLOGICAL SOC |
publishDate |
2017 |
url |
https://kups.ub.uni-koeln.de/24050/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Barrow Alaska |
genre_facet |
Arctic Arctic Barrow Alaska |
op_relation |
Maahn, Maximilian orcid:0000-0002-2580-9100 and Loehnert, Ulrich (2017). Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds. J. Appl. Meteorol. Climatol., 56 (2). S. 263 - 283. BOSTON: AMER METEOROLOGICAL SOC. ISSN 1558-8432 |
_version_ |
1766298015741509632 |