First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland
The microphysical properties of clouds play a significant role in determining their radiative effect; one of these properties is the orientation of ice crystals. A source of error in current microphysical retrievals and model simulations is the assumption that clouds are composed of only randomly or...
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ftleedsuniv:oai:eprints.whiterose.ac.uk:117287 2023-05-15T16:26:54+02:00 First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland Cole, S Neely III., RR Stillwell, RA 2017-03-16 text https://eprints.whiterose.ac.uk/117287/ https://eprints.whiterose.ac.uk/117287/1/acp-2016-1134.pdf en eng European Geosciences Union https://eprints.whiterose.ac.uk/117287/1/acp-2016-1134.pdf Cole, S, Neely III., RR orcid.org/0000-0003-4560-4812 and Stillwell, RA (2017) First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland. Atmospheric Chemistry and Physics Discussions. ISSN 1680-7367 cc_by_3 CC-BY Article NonPeerReviewed 2017 ftleedsuniv 2023-01-30T21:55:37Z The microphysical properties of clouds play a significant role in determining their radiative effect; one of these properties is the orientation of ice crystals. A source of error in current microphysical retrievals and model simulations is the assumption that clouds are composed of only randomly oriented ice crystals (ROIC). This assumption is frequently not true, as evidenced by optical phenomena such as parhelia (commonly referred to as sundogs). Here, observations from the Cloud, Aerosol and Polarization Backscatter Lidar (CAPABL) at Summit, Greenland are utilized along with instruments that are part of the Integrated Characterization of Energy, Clouds, Atmospheric state and Precipitation at Summit (ICECAPS) project in order to determine when, where and under what conditions horizontally oriented ice crystals (HOIC) occur at Summit, Greenland. Between July 2015 and May 2016, HOIC are observed on 86 days of the 335-day study. HOIC occurred within stratiform clouds on 48 days, in precipitation on 32 days and in cirrus clouds on 14 days. Analysis of all of the cases found that, on average, in comparison to ROIC, HOIC occur at higher temperatures, higher wind speeds and lower heights above ground level. Differences were also present in the relative humidities (RHs) at which HOIC and ROIC occurred in stratiform clouds and precipitation but not in cirrus clouds. Analysis over the whole study period revealed monthly variations in the abundance of HOIC with the number of detections peaking in April and October. Monthly changes were also present in the number of days containing HOIC. The results presented here aim to be the first step towards a comprehensive climatology and understanding of the microphysical processes that lead to the formation of HOIC at Summit, Greenland. Article in Journal/Newspaper Greenland White Rose Research Online (Universities of Leeds, Sheffield & York) Greenland |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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ftleedsuniv |
language |
English |
description |
The microphysical properties of clouds play a significant role in determining their radiative effect; one of these properties is the orientation of ice crystals. A source of error in current microphysical retrievals and model simulations is the assumption that clouds are composed of only randomly oriented ice crystals (ROIC). This assumption is frequently not true, as evidenced by optical phenomena such as parhelia (commonly referred to as sundogs). Here, observations from the Cloud, Aerosol and Polarization Backscatter Lidar (CAPABL) at Summit, Greenland are utilized along with instruments that are part of the Integrated Characterization of Energy, Clouds, Atmospheric state and Precipitation at Summit (ICECAPS) project in order to determine when, where and under what conditions horizontally oriented ice crystals (HOIC) occur at Summit, Greenland. Between July 2015 and May 2016, HOIC are observed on 86 days of the 335-day study. HOIC occurred within stratiform clouds on 48 days, in precipitation on 32 days and in cirrus clouds on 14 days. Analysis of all of the cases found that, on average, in comparison to ROIC, HOIC occur at higher temperatures, higher wind speeds and lower heights above ground level. Differences were also present in the relative humidities (RHs) at which HOIC and ROIC occurred in stratiform clouds and precipitation but not in cirrus clouds. Analysis over the whole study period revealed monthly variations in the abundance of HOIC with the number of detections peaking in April and October. Monthly changes were also present in the number of days containing HOIC. The results presented here aim to be the first step towards a comprehensive climatology and understanding of the microphysical processes that lead to the formation of HOIC at Summit, Greenland. |
format |
Article in Journal/Newspaper |
author |
Cole, S Neely III., RR Stillwell, RA |
spellingShingle |
Cole, S Neely III., RR Stillwell, RA First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland |
author_facet |
Cole, S Neely III., RR Stillwell, RA |
author_sort |
Cole, S |
title |
First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland |
title_short |
First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland |
title_full |
First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland |
title_fullStr |
First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland |
title_full_unstemmed |
First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland |
title_sort |
first look at the occurrence of horizontally oriented ice crystals over summit, greenland |
publisher |
European Geosciences Union |
publishDate |
2017 |
url |
https://eprints.whiterose.ac.uk/117287/ https://eprints.whiterose.ac.uk/117287/1/acp-2016-1134.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://eprints.whiterose.ac.uk/117287/1/acp-2016-1134.pdf Cole, S, Neely III., RR orcid.org/0000-0003-4560-4812 and Stillwell, RA (2017) First Look at the Occurrence of Horizontally Oriented Ice Crystals over Summit, Greenland. Atmospheric Chemistry and Physics Discussions. ISSN 1680-7367 |
op_rights |
cc_by_3 |
op_rightsnorm |
CC-BY |
_version_ |
1766015917218594816 |