Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime
The degree of glaciation of mixed-phase clouds constitutes one of the largest uncertainties in climate prediction. In order to better understand cloud glaciation, cloud spectrometer observations are presented in this paper, which were made in the mixed-phase temperature regime between 0 and -38°C (2...
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ftleibnizopen:oai:oai.leibnizopen.de:BYf5pIkBdbrxVwz6VrWv 2023-08-20T04:04:00+02:00 Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime Costa, Anja Meyer, Jessica Afchine, Armin Luebke, Anna Günther, Gebhard Dorsey, James R. Gallagher, Martin W. Ehrlich, Andre Wendisch, Manfred Baumgardner, Darrel Wex, Heike Krämer, Martina 2017 application/pdf https://oa.tib.eu/renate/handle/123456789/11924 https://doi.org/10.34657/10957 eng eng Katlenburg-Lindau : EGU CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0 Atmospheric Chemistry and Physics 17 (2017), Nr. 19 air temperature climate prediction cloud cover glaciation ice temperature effect Arctic 550 article Text 2017 ftleibnizopen https://doi.org/10.34657/10957 2023-07-30T23:32:54Z The degree of glaciation of mixed-phase clouds constitutes one of the largest uncertainties in climate prediction. In order to better understand cloud glaciation, cloud spectrometer observations are presented in this paper, which were made in the mixed-phase temperature regime between 0 and -38°C (273 to 235K), where cloud particles can either be frozen or liquid. The extensive data set covers four airborne field campaigns providing a total of 139000 1Hz data points (38.6h within clouds) over Arctic, midlatitude and tropical regions. We develop algorithms, combining the information on number concentration, size and asphericity of the observed cloud particles to classify four cloud types: liquid clouds, clouds in which liquid droplets and ice crystals coexist, fully glaciated clouds after the Wegener-Bergeron-Findeisen process and clouds where secondary ice formation occurred. We quantify the occurrence of these cloud groups depending on the geographical region and temperature and find that liquid clouds dominate our measurements during the Arctic spring, while clouds dominated by the Wegener-Bergeron-Findeisen process are most common in midlatitude spring. The coexistence of liquid water and ice crystals is found over the whole mixed-phase temperature range in tropical convective towers in the dry season. Secondary ice is found at midlatitudes at -5 to -10°C (268 to 263K) and at higher altitudes, i.e. lower temperatures in the tropics. The distribution of the cloud types with decreasing temperature is shown to be consistent with the theory of evolution of mixed-phase clouds. With this study, we aim to contribute to a large statistical database on cloud types in the mixed-phase temperature regime. publishedVersion Article in Journal/Newspaper Arctic LeibnizOpen (The Leibniz Association) Arctic |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
air temperature climate prediction cloud cover glaciation ice temperature effect Arctic 550 |
spellingShingle |
air temperature climate prediction cloud cover glaciation ice temperature effect Arctic 550 Costa, Anja Meyer, Jessica Afchine, Armin Luebke, Anna Günther, Gebhard Dorsey, James R. Gallagher, Martin W. Ehrlich, Andre Wendisch, Manfred Baumgardner, Darrel Wex, Heike Krämer, Martina Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
topic_facet |
air temperature climate prediction cloud cover glaciation ice temperature effect Arctic 550 |
description |
The degree of glaciation of mixed-phase clouds constitutes one of the largest uncertainties in climate prediction. In order to better understand cloud glaciation, cloud spectrometer observations are presented in this paper, which were made in the mixed-phase temperature regime between 0 and -38°C (273 to 235K), where cloud particles can either be frozen or liquid. The extensive data set covers four airborne field campaigns providing a total of 139000 1Hz data points (38.6h within clouds) over Arctic, midlatitude and tropical regions. We develop algorithms, combining the information on number concentration, size and asphericity of the observed cloud particles to classify four cloud types: liquid clouds, clouds in which liquid droplets and ice crystals coexist, fully glaciated clouds after the Wegener-Bergeron-Findeisen process and clouds where secondary ice formation occurred. We quantify the occurrence of these cloud groups depending on the geographical region and temperature and find that liquid clouds dominate our measurements during the Arctic spring, while clouds dominated by the Wegener-Bergeron-Findeisen process are most common in midlatitude spring. The coexistence of liquid water and ice crystals is found over the whole mixed-phase temperature range in tropical convective towers in the dry season. Secondary ice is found at midlatitudes at -5 to -10°C (268 to 263K) and at higher altitudes, i.e. lower temperatures in the tropics. The distribution of the cloud types with decreasing temperature is shown to be consistent with the theory of evolution of mixed-phase clouds. With this study, we aim to contribute to a large statistical database on cloud types in the mixed-phase temperature regime. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Costa, Anja Meyer, Jessica Afchine, Armin Luebke, Anna Günther, Gebhard Dorsey, James R. Gallagher, Martin W. Ehrlich, Andre Wendisch, Manfred Baumgardner, Darrel Wex, Heike Krämer, Martina |
author_facet |
Costa, Anja Meyer, Jessica Afchine, Armin Luebke, Anna Günther, Gebhard Dorsey, James R. Gallagher, Martin W. Ehrlich, Andre Wendisch, Manfred Baumgardner, Darrel Wex, Heike Krämer, Martina |
author_sort |
Costa, Anja |
title |
Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
title_short |
Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
title_full |
Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
title_fullStr |
Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
title_full_unstemmed |
Classification of Arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
title_sort |
classification of arctic, midlatitude and tropical clouds in the mixed-phase temperature regime |
publisher |
Katlenburg-Lindau : EGU |
publishDate |
2017 |
url |
https://oa.tib.eu/renate/handle/123456789/11924 https://doi.org/10.34657/10957 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics 17 (2017), Nr. 19 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0 |
op_doi |
https://doi.org/10.34657/10957 |
_version_ |
1774714437972787200 |