Lidar measurements of thin laminations within Arctic clouds
<p>Very thin ( < 10 m) laminations within Arctic clouds have been observed in all seasons using the Canadian Network for the Detection of Atmospheric Change (CANDAC) Rayleigh–Mie–Raman lidar (CRL) at the Polar Environment Atmospheric Research Laboratory (PEARL; located at...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2019-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/19/4595/2019/acp-19-4595-2019.pdf |
| Summary: | <p>Very thin ( < 10 m) laminations within Arctic clouds have been observed in
all seasons using the Canadian Network for the Detection of Atmospheric
Change (CANDAC) Rayleigh–Mie–Raman lidar (CRL) at the Polar Environment
Atmospheric Research Laboratory (PEARL; located at Eureka, Nunavut, in the
Canadian High Arctic). CRL's time (1 min) and altitude (7.5 m)
resolutions from 500 m to greater than 12 km altitude make these
measurements possible. We have observed a variety of thicknesses for
individual laminations, with some at least as thin as the detection limit of
the lidar (7.5 m). The clouds which contain the laminated features are
typically found below 4 km, can last longer than 24 h, and occur most
frequently during periods of snow and rain, often during very stable
temperature inversion conditions. Results are presented for range-scaled
photocounts at 532 and 355 nm, ratios of 532∕355 nm photocounts, and
the 532 nm linear depolarization parameter, and with context provided by
twice-daily Eureka radiosonde temperature and relative humidity profiles.</p> |
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| ISSN: | 1680-7316 1680-7324 |