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Title: Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiagvik, Alaska

Abstract

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 windmore » is possibly due to the cleaner air masses from the ocean (north). Lastly, 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
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  1. Univ. of Arizona, Tucson, AZ (United States). Dept. of Hydrology and Atmospheric Sciences
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1563958
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Volume: 123; Journal Issue: 17; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Qiu, Shaoyue, Xi, Baike, and Dong, Xiquan. Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiagvik, Alaska. United States: N. p., 2018. Web. doi:10.1029/2018jd028631.
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Qiu, Shaoyue, Xi, Baike, & Dong, Xiquan. Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiagvik, Alaska. United States. https://doi.org/10.1029/2018jd028631
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Qiu, Shaoyue, Xi, Baike, and Dong, Xiquan. Tue . "Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiagvik, Alaska". United States. https://doi.org/10.1029/2018jd028631. https://www.osti.gov/servlets/purl/1563958.
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@article{osti_1563958,
title = {Influence of Wind Direction on Thermodynamic Properties and Arctic Mixed-Phase Clouds in Autumn at Utqiagvik, Alaska},
author = {Qiu, Shaoyue and Xi, Baike and Dong, Xiquan},
abstractNote = {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). Lastly, 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.},
doi = {10.1029/2018jd028631},
journal = {Journal of Geophysical Research: Atmospheres},
number = 17,
volume = 123,
place = {United States},
year = {Tue Aug 21 00:00:00 EDT 2018},
month = {Tue Aug 21 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1029/2018jd028631
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Cited by: 4 works
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Figures / Tables:

Figure 1 Figure 1: Occurrence frequencies of low‐level Arctic mixed‐phase clouds (AMC top height ≤ 3 km), wind, cloud base/cloud top heights, and LWPs during different wind directions at the Atmospheric Radiation Measurement North Slope of Alaska (ARM NSA) site from September to November during the period 2002–2008. (a–c) The occurrence frequenciesmore » of wind (black lines) and AMCs (blue). (d–f) The box and whisker plots of AMC cloud top (black lines, derived from ARM cloud radar), ceilometer‐derived cloud base (blue lines), and MPL‐derived cloud base (red lines). The whisker diagram includes the median (middle bar), 25th and 75th percentiles (ends of boxes) and 5th and 95th percentiles (lower and upper bar). (g–i) AMC mean LWPs for different wind directions.« less
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    A survey of the atmospheric physical processes key to the onset of Arctic sea ice melt in spring
    journal, September 2018

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