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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fttibhannoverren:oai:oa.tib.eu:123456789/11924 2023-06-06T11:50:01+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 ESSN:1680-7324 DOI:https://doi.org/10.5194/acp-17-12219-2017 https://oa.tib.eu/renate/handle/123456789/11924 http://dx.doi.org/10.34657/10957 CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0 frei zugänglich Atmospheric Chemistry and Physics 17 (2017), Nr. 19 air temperature climate prediction cloud cover glaciation ice temperature effect Arctic ddc:550 status-type:publishedVersion doc-type:article doc-type:Text 2017 fttibhannoverren https://doi.org/10.34657/1095710.5194/acp-17-12219-2017 2023-04-17T16:18:25Z 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. Article in Journal/Newspaper Arctic Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Arctic |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
language |
English |
topic |
air temperature climate prediction cloud cover glaciation ice temperature effect Arctic ddc:550 |
spellingShingle |
air temperature climate prediction cloud cover glaciation ice temperature effect Arctic ddc: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 ddc: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. |
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_relation |
ESSN:1680-7324 DOI:https://doi.org/10.5194/acp-17-12219-2017 https://oa.tib.eu/renate/handle/123456789/11924 http://dx.doi.org/10.34657/10957 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0 frei zugänglich |
op_doi |
https://doi.org/10.34657/1095710.5194/acp-17-12219-2017 |
_version_ |
1767955782824886272 |