Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar
Turbulent dissipation rate retrievals from cloud radar Doppler velocity measurements are evaluated using independent, in situ observations in Arctic stratocumulus clouds. In situ validation data sets of dissipation rate are derived using sonic anemometer measurements from a tethered balloon and high...
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ftcopernicus:oai:publications.copernicus.org:amt13816 2023-05-15T14:58:32+02:00 Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar Shupe, M. D. Brooks, I. M. Canut, G. 2018-01-15 application/pdf https://doi.org/10.5194/amt-5-1375-2012 https://amt.copernicus.org/articles/5/1375/2012/ eng eng doi:10.5194/amt-5-1375-2012 https://amt.copernicus.org/articles/5/1375/2012/ eISSN: 1867-8548 Text 2018 ftcopernicus https://doi.org/10.5194/amt-5-1375-2012 2020-07-20T16:25:48Z Turbulent dissipation rate retrievals from cloud radar Doppler velocity measurements are evaluated using independent, in situ observations in Arctic stratocumulus clouds. In situ validation data sets of dissipation rate are derived using sonic anemometer measurements from a tethered balloon and high frequency pressure variation observations from a research aircraft, both flown in proximity to stationary, ground-based radars. Modest biases are found among the data sets in particularly low- or high-turbulence regimes, but in general the radar-retrieved values correspond well with the in situ measurements. Root mean square differences are typically a factor of 4–6 relative to any given magnitude of dissipation rate. These differences are no larger than those found when comparing dissipation rates computed from tethered-balloon and meteorological tower-mounted sonic anemometer measurements made at spatial distances of a few hundred meters. Temporal lag analyses suggest that approximately half of the observed differences are due to spatial sampling considerations, such that the anticipated radar-based retrieval uncertainty is on the order of a factor of 2–3. Moreover, radar retrievals are clearly able to capture the vertical dissipation rate structure observed by the in situ sensors, while offering substantially more information on the time variability of turbulence profiles. Together these evaluations indicate that radar-based retrievals can, at a minimum, be used to determine the vertical structure of turbulence in Arctic stratocumulus clouds. Text Arctic Copernicus Publications: E-Journals Arctic Atmospheric Measurement Techniques 5 6 1375 1385 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Turbulent dissipation rate retrievals from cloud radar Doppler velocity measurements are evaluated using independent, in situ observations in Arctic stratocumulus clouds. In situ validation data sets of dissipation rate are derived using sonic anemometer measurements from a tethered balloon and high frequency pressure variation observations from a research aircraft, both flown in proximity to stationary, ground-based radars. Modest biases are found among the data sets in particularly low- or high-turbulence regimes, but in general the radar-retrieved values correspond well with the in situ measurements. Root mean square differences are typically a factor of 4–6 relative to any given magnitude of dissipation rate. These differences are no larger than those found when comparing dissipation rates computed from tethered-balloon and meteorological tower-mounted sonic anemometer measurements made at spatial distances of a few hundred meters. Temporal lag analyses suggest that approximately half of the observed differences are due to spatial sampling considerations, such that the anticipated radar-based retrieval uncertainty is on the order of a factor of 2–3. Moreover, radar retrievals are clearly able to capture the vertical dissipation rate structure observed by the in situ sensors, while offering substantially more information on the time variability of turbulence profiles. Together these evaluations indicate that radar-based retrievals can, at a minimum, be used to determine the vertical structure of turbulence in Arctic stratocumulus clouds. |
format |
Text |
author |
Shupe, M. D. Brooks, I. M. Canut, G. |
spellingShingle |
Shupe, M. D. Brooks, I. M. Canut, G. Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar |
author_facet |
Shupe, M. D. Brooks, I. M. Canut, G. |
author_sort |
Shupe, M. D. |
title |
Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar |
title_short |
Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar |
title_full |
Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar |
title_fullStr |
Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar |
title_full_unstemmed |
Evaluation of turbulent dissipation rate retrievals from Doppler Cloud Radar |
title_sort |
evaluation of turbulent dissipation rate retrievals from doppler cloud radar |
publishDate |
2018 |
url |
https://doi.org/10.5194/amt-5-1375-2012 https://amt.copernicus.org/articles/5/1375/2012/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
eISSN: 1867-8548 |
op_relation |
doi:10.5194/amt-5-1375-2012 https://amt.copernicus.org/articles/5/1375/2012/ |
op_doi |
https://doi.org/10.5194/amt-5-1375-2012 |
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Atmospheric Measurement Techniques |
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5 |
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6 |
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1375 |
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1385 |
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1766330680736743424 |