Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska
Seven years of autumnal ground-based observations (September–November 2002–2008) at the U.S. Department of Energy Atmospheric Radiation Measurement North Slope of Alaska site have been analyzed for addressing the occurrence frequency and macrophysical and microphysical properties of Arctic mixed-pha...
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ftcdlib:oai:escholarship.org/ark:/13030/qt8hk91057 2023-05-15T14:55:36+02:00 Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska Qiu, S Xi, B Dong, X 9589 - 9603 2018-09-16 application/pdf https://escholarship.org/uc/item/8hk91057 unknown eScholarship, University of California qt8hk91057 https://escholarship.org/uc/item/8hk91057 public Journal of Geophysical Research: Atmospheres, vol 123, iss 17 Arctic mixed-phase cloud thermodynamic profile wind direction cloud occurrence frequency cloud microphysical processes cloud vertical structure Atmospheric Sciences Physical Geography and Environmental Geoscience article 2018 ftcdlib 2021-06-28T17:07:39Z Seven years of autumnal ground-based observations (September–November 2002–2008) at the U.S. Department of Energy Atmospheric Radiation Measurement North Slope of Alaska site have been analyzed for addressing the occurrence frequency and macrophysical and microphysical properties of Arctic mixed-phase clouds (AMC), as well as the relationship between environmental parameters and AMC properties. In September and October, AMC occurrence frequency is 20–30% lower during a southerly wind when compared to the other wind directions; in November, the variation of AMC occurrence frequency with wind direction is small. The mean liquid water path in November is about half of that in October and September. When the surface is snow free, temperature (T) and specific humidity (q) profiles during a northerly wind are warmer and moister than those for the southerly wind. Northerly wind profiles have a higher relative humidity to ice (RHi) and lower atmosphere stability. Furthermore, the AMC occurrence frequency has a positive relationship with RHi and a negative relationship with stability. These two points may explain the lower AMC occurrence frequency during a southerly wind. During a northerly wind, AMCs have larger radar reflectivity, wider spectrum width, and larger Doppler velocity signatures. The stronger precipitation for AMC during a northerly wind is possibly due to the cleaner air masses from the ocean (north). With the same amount of q, the radar spectrum width has a higher frequency in the larger bins during a northerly wind. Both T, q, and radar reflectivity, radar spectrum width profiles show evidence of deposition in the sub-cloud layer in September and October. Article in Journal/Newspaper Arctic north slope Alaska University of California: eScholarship Arctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Arctic mixed-phase cloud thermodynamic profile wind direction cloud occurrence frequency cloud microphysical processes cloud vertical structure Atmospheric Sciences Physical Geography and Environmental Geoscience |
spellingShingle |
Arctic mixed-phase cloud thermodynamic profile wind direction cloud occurrence frequency cloud microphysical processes cloud vertical structure Atmospheric Sciences Physical Geography and Environmental Geoscience Qiu, S Xi, B Dong, X Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska |
topic_facet |
Arctic mixed-phase cloud thermodynamic profile wind direction cloud occurrence frequency cloud microphysical processes cloud vertical structure Atmospheric Sciences Physical Geography and Environmental Geoscience |
description |
Seven years of autumnal ground-based observations (September–November 2002–2008) at the U.S. Department of Energy Atmospheric Radiation Measurement North Slope of Alaska site have been analyzed for addressing the occurrence frequency and macrophysical and microphysical properties of Arctic mixed-phase clouds (AMC), as well as the relationship between environmental parameters and AMC properties. In September and October, AMC occurrence frequency is 20–30% lower during a southerly wind when compared to the other wind directions; in November, the variation of AMC occurrence frequency with wind direction is small. The mean liquid water path in November is about half of that in October and September. When the surface is snow free, temperature (T) and specific humidity (q) profiles during a northerly wind are warmer and moister than those for the southerly wind. Northerly wind profiles have a higher relative humidity to ice (RHi) and lower atmosphere stability. Furthermore, the AMC occurrence frequency has a positive relationship with RHi and a negative relationship with stability. These two points may explain the lower AMC occurrence frequency during a southerly wind. During a northerly wind, AMCs have larger radar reflectivity, wider spectrum width, and larger Doppler velocity signatures. The stronger precipitation for AMC during a northerly wind is possibly due to the cleaner air masses from the ocean (north). With the same amount of q, the radar spectrum width has a higher frequency in the larger bins during a northerly wind. Both T, q, and radar reflectivity, radar spectrum width profiles show evidence of deposition in the sub-cloud layer in September and October. |
format |
Article in Journal/Newspaper |
author |
Qiu, S Xi, B Dong, X |
author_facet |
Qiu, S Xi, B Dong, X |
author_sort |
Qiu, S |
title |
Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska |
title_short |
Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska |
title_full |
Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska |
title_fullStr |
Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska |
title_full_unstemmed |
Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiaġvik, Alaska |
title_sort |
influence of wind direction on thermodynamic properties and arctic mixed-phase clouds in autumn at utqiaġvik, alaska |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/8hk91057 |
op_coverage |
9589 - 9603 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope Alaska |
genre_facet |
Arctic north slope Alaska |
op_source |
Journal of Geophysical Research: Atmospheres, vol 123, iss 17 |
op_relation |
qt8hk91057 https://escholarship.org/uc/item/8hk91057 |
op_rights |
public |
_version_ |
1766327628520751104 |