Ice Fog and Light Snow Measurements Using a High-Resolution Camera System
Ice fog, diamond dust, and light snow usually form over extremely cold weather conditions, and they affect both visibility and Earth’s radiative energy budget. Prediction of these hydrometeors using models is difficult because of limited knowledge of the microphysical properties at the small size ra...
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Luleå tekniska universitet, Rymdteknik
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ftluleatu:oai:DiVA.org:ltu-2909 2023-05-15T18:45:44+02:00 Ice Fog and Light Snow Measurements Using a High-Resolution Camera System Kuhn, Thomas Gultepe, Ismail 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-2909 https://doi.org/10.1007/s00024-016-1343-7 eng eng Luleå tekniska universitet, Rymdteknik Cloud Physics and Severe Weather Research Section, Environment Canada, Toronto, ON, Canada Pure and Applied Geophysics, 0033-4553, 2016, 173:9, s. 3049-3064 orcid:0000-0003-3701-7925 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-2909 doi:10.1007/s00024-016-1343-7 ISI:000382941400005 Scopus 2-s2.0-84986620977 Local 0a4144d5-c9bd-4686-8bab-f783b6fceab3 info:eu-repo/semantics/openAccess Ice fog snow precipitation ice particles fall speed optical imaging Aerospace Engineering Rymd- och flygteknik Article in journal info:eu-repo/semantics/article text 2016 ftluleatu https://doi.org/10.1007/s00024-016-1343-7 2022-10-25T20:58:49Z Ice fog, diamond dust, and light snow usually form over extremely cold weather conditions, and they affect both visibility and Earth’s radiative energy budget. Prediction of these hydrometeors using models is difficult because of limited knowledge of the microphysical properties at the small size ranges due to measurement issues. These phenomena need to be better represented in forecast and climate models; therefore, in addition to remote sensing accurate measurements using ground-based instrumentation are required. An imaging instrument, aimed at measuring ice fog and light snow particles, has been built and is presented here. The ice crystal imaging (ICI) probe samples ice particles into a vertical, tapered inlet with an inlet flow rate of 11 L min−1. A laser beam across the vertical air flow containing the ice crystals allows for their detection by a photodetector collecting the scattered light. Detected particles are then imaged with high optical resolution. An illuminating LED flash and image capturing are triggered by the photodetector. In this work, ICI measurements collected during the fog remote sensing and modeling (FRAM) project, which took place during Winter of 2010–2011 in Yellowknife, NWT, Canada, are summarized and challenges related to measuring small ice particles are described. The majority of ice particles during the 2-month-long campaign had sizes between 300 and 800 μm. During ice fog events the size distribution measured had a lower mode diameter of 300 μm compared to the overall campaign average with mode at 500 μm. Validerad; 2016; Nivå 2; 2016-10-12 (andbra) Article in Journal/Newspaper Yellowknife Luleå University of Technology Publications (DiVA) Canada Yellowknife Pure and Applied Geophysics 173 9 3049 3064 |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
Ice fog snow precipitation ice particles fall speed optical imaging Aerospace Engineering Rymd- och flygteknik |
spellingShingle |
Ice fog snow precipitation ice particles fall speed optical imaging Aerospace Engineering Rymd- och flygteknik Kuhn, Thomas Gultepe, Ismail Ice Fog and Light Snow Measurements Using a High-Resolution Camera System |
topic_facet |
Ice fog snow precipitation ice particles fall speed optical imaging Aerospace Engineering Rymd- och flygteknik |
description |
Ice fog, diamond dust, and light snow usually form over extremely cold weather conditions, and they affect both visibility and Earth’s radiative energy budget. Prediction of these hydrometeors using models is difficult because of limited knowledge of the microphysical properties at the small size ranges due to measurement issues. These phenomena need to be better represented in forecast and climate models; therefore, in addition to remote sensing accurate measurements using ground-based instrumentation are required. An imaging instrument, aimed at measuring ice fog and light snow particles, has been built and is presented here. The ice crystal imaging (ICI) probe samples ice particles into a vertical, tapered inlet with an inlet flow rate of 11 L min−1. A laser beam across the vertical air flow containing the ice crystals allows for their detection by a photodetector collecting the scattered light. Detected particles are then imaged with high optical resolution. An illuminating LED flash and image capturing are triggered by the photodetector. In this work, ICI measurements collected during the fog remote sensing and modeling (FRAM) project, which took place during Winter of 2010–2011 in Yellowknife, NWT, Canada, are summarized and challenges related to measuring small ice particles are described. The majority of ice particles during the 2-month-long campaign had sizes between 300 and 800 μm. During ice fog events the size distribution measured had a lower mode diameter of 300 μm compared to the overall campaign average with mode at 500 μm. Validerad; 2016; Nivå 2; 2016-10-12 (andbra) |
format |
Article in Journal/Newspaper |
author |
Kuhn, Thomas Gultepe, Ismail |
author_facet |
Kuhn, Thomas Gultepe, Ismail |
author_sort |
Kuhn, Thomas |
title |
Ice Fog and Light Snow Measurements Using a High-Resolution Camera System |
title_short |
Ice Fog and Light Snow Measurements Using a High-Resolution Camera System |
title_full |
Ice Fog and Light Snow Measurements Using a High-Resolution Camera System |
title_fullStr |
Ice Fog and Light Snow Measurements Using a High-Resolution Camera System |
title_full_unstemmed |
Ice Fog and Light Snow Measurements Using a High-Resolution Camera System |
title_sort |
ice fog and light snow measurements using a high-resolution camera system |
publisher |
Luleå tekniska universitet, Rymdteknik |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-2909 https://doi.org/10.1007/s00024-016-1343-7 |
geographic |
Canada Yellowknife |
geographic_facet |
Canada Yellowknife |
genre |
Yellowknife |
genre_facet |
Yellowknife |
op_relation |
Pure and Applied Geophysics, 0033-4553, 2016, 173:9, s. 3049-3064 orcid:0000-0003-3701-7925 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-2909 doi:10.1007/s00024-016-1343-7 ISI:000382941400005 Scopus 2-s2.0-84986620977 Local 0a4144d5-c9bd-4686-8bab-f783b6fceab3 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00024-016-1343-7 |
container_title |
Pure and Applied Geophysics |
container_volume |
173 |
container_issue |
9 |
container_start_page |
3049 |
op_container_end_page |
3064 |
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1766236864406093824 |