Physical properties of High Arctic tropospheric particles during winter
A climatology of particle scattering properties in the wintertime High Arctic troposphere, including vertical distributions and effective radii, is presented. The measurements were obtained using a lidar and cloud radar located at Eureka, Nunavut Territory (80° N, 86° W). Four different particle gro...
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Online Access: | https://doi.org/10.5194/acp-9-6881-2009 https://www.atmos-chem-phys.net/9/6881/2009/ |
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ftcopernicus:oai:publications.copernicus.org:acp534 2023-05-15T14:54:15+02:00 Physical properties of High Arctic tropospheric particles during winter Bourdages, L. Duck, T. J. Lesins, G. Drummond, J. R. Eloranta, E. W. 2018-01-15 application/pdf https://doi.org/10.5194/acp-9-6881-2009 https://www.atmos-chem-phys.net/9/6881/2009/ eng eng doi:10.5194/acp-9-6881-2009 https://www.atmos-chem-phys.net/9/6881/2009/ eISSN: 1680-7324 Text 2018 ftcopernicus https://doi.org/10.5194/acp-9-6881-2009 2019-12-24T09:57:43Z A climatology of particle scattering properties in the wintertime High Arctic troposphere, including vertical distributions and effective radii, is presented. The measurements were obtained using a lidar and cloud radar located at Eureka, Nunavut Territory (80° N, 86° W). Four different particle groupings are considered: boundary-layer ice crystals, ice clouds, mixed-phase clouds, and aerosols. Two-dimensional histograms of occurrence probabilities against depolarization, radar/lidar colour ratio and height are given. Colour ratios are related to particle minimum dimensions (i.e., widths rather than lengths) using a Mie scattering model. Ice cloud crystals have effective radii spanning 25–220 µm, with larger particles observed at lower altitudes. Topographic blowing snow residuals in the boundary layer have the smallest crystals at 15–70 µm. Mixed-phase clouds have water droplets and ice crystal precipitation in the 5–40 µm and 40–220 µm ranges, respectively. Ice cloud crystals have depolarization decreasing with height. The depolarization trend is associated with the large ice crystal sub-population. Small crystals depolarize more than large ones in ice clouds at a given altitude, and show constant modal depolarization with height. Ice clouds in the mid-troposphere are sometimes observed to precipitate to the ground. Water clouds are constrained to the lower troposphere (0.5–3.5 km altitude). Aerosols are most abundant near the ground and are frequently mixed with the other particle types. The data are used to construct a classification chart for particle scattering in wintertime Arctic conditions. Text Arctic Eureka Nunavut Copernicus Publications: E-Journals Arctic Eureka ENVELOPE(-85.940,-85.940,79.990,79.990) Nunavut Atmospheric Chemistry and Physics 9 18 6881 6897 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
A climatology of particle scattering properties in the wintertime High Arctic troposphere, including vertical distributions and effective radii, is presented. The measurements were obtained using a lidar and cloud radar located at Eureka, Nunavut Territory (80° N, 86° W). Four different particle groupings are considered: boundary-layer ice crystals, ice clouds, mixed-phase clouds, and aerosols. Two-dimensional histograms of occurrence probabilities against depolarization, radar/lidar colour ratio and height are given. Colour ratios are related to particle minimum dimensions (i.e., widths rather than lengths) using a Mie scattering model. Ice cloud crystals have effective radii spanning 25–220 µm, with larger particles observed at lower altitudes. Topographic blowing snow residuals in the boundary layer have the smallest crystals at 15–70 µm. Mixed-phase clouds have water droplets and ice crystal precipitation in the 5–40 µm and 40–220 µm ranges, respectively. Ice cloud crystals have depolarization decreasing with height. The depolarization trend is associated with the large ice crystal sub-population. Small crystals depolarize more than large ones in ice clouds at a given altitude, and show constant modal depolarization with height. Ice clouds in the mid-troposphere are sometimes observed to precipitate to the ground. Water clouds are constrained to the lower troposphere (0.5–3.5 km altitude). Aerosols are most abundant near the ground and are frequently mixed with the other particle types. The data are used to construct a classification chart for particle scattering in wintertime Arctic conditions. |
format |
Text |
author |
Bourdages, L. Duck, T. J. Lesins, G. Drummond, J. R. Eloranta, E. W. |
spellingShingle |
Bourdages, L. Duck, T. J. Lesins, G. Drummond, J. R. Eloranta, E. W. Physical properties of High Arctic tropospheric particles during winter |
author_facet |
Bourdages, L. Duck, T. J. Lesins, G. Drummond, J. R. Eloranta, E. W. |
author_sort |
Bourdages, L. |
title |
Physical properties of High Arctic tropospheric particles during winter |
title_short |
Physical properties of High Arctic tropospheric particles during winter |
title_full |
Physical properties of High Arctic tropospheric particles during winter |
title_fullStr |
Physical properties of High Arctic tropospheric particles during winter |
title_full_unstemmed |
Physical properties of High Arctic tropospheric particles during winter |
title_sort |
physical properties of high arctic tropospheric particles during winter |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-9-6881-2009 https://www.atmos-chem-phys.net/9/6881/2009/ |
long_lat |
ENVELOPE(-85.940,-85.940,79.990,79.990) |
geographic |
Arctic Eureka Nunavut |
geographic_facet |
Arctic Eureka Nunavut |
genre |
Arctic Eureka Nunavut |
genre_facet |
Arctic Eureka Nunavut |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-9-6881-2009 https://www.atmos-chem-phys.net/9/6881/2009/ |
op_doi |
https://doi.org/10.5194/acp-9-6881-2009 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
9 |
container_issue |
18 |
container_start_page |
6881 |
op_container_end_page |
6897 |
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1766325968065003520 |