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Title: Characterizing Arctic mixed-phase cloud structure and its relationship with humidity and temperature inversion using ARM NSA observations

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1002/2014JD023022· OSTI ID:1440551
 [1];  [1];  [1];  [2]
  1. Univ. of North Dakota, Grand Forks, ND (United States). Department of Atmospheric Sciences
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Laboratory
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In this work, the characteristics of the Arctic mixed-phase cloud (AMC) have been investigated using data collected at the Atmospheric Radiation Measurement North Slope Alaska site from October 2006 to September 2009. AMC has an annual occurrence frequency of 42.3%, which includes 18.7% of single-layered AMCs and 23.6% for multiple layers. Two cloud base heights (CBHs) are defined from ceilometer and micropulse lidar (MPL) measurements. For single-layered AMC, the ceilometer-derived CBH represents the base of the liquid-dominant layer near the cloud top, while MPL-derived CBH represents base of the lower ice-dominant layer. The annual mean CBHs from ceilometer and MPL measurements are 1.0 km and 0.6 km, respectively, with the largest difference (~1.0 km) occurring from December to March and the smallest difference in September. The humidity inversion occurrence decreases with increasing humidity inversion intensity (stronger in summer than in winter). During the winter months, AMC occurrences increase from 15% to 35% when the inversion intensity increases from 0.1 to 0.9 g/kg. On the contrary, despite a higher frequency of strong humidity inversion in summer, AMC occurrences are nearly invariant for different inversion intensities. On average, humidity and temperature inversion frequencies of occurrence above an AMC are 5 and 8 times, respectively, as high as those below an AMC. The strong inversion occurrences for both humidity and temperature above an AMC provide the moisture sources from above for the formation and maintenance of AMCs. In conclusion, this result helps to reconcile the persistency of AMCs even when the Arctic surface is covered by snow and ice.

Research Organization:
Univ. of North Dakota, Grand Forks, ND (United States)
Sponsoring Organization:
USDOE Office of Environment, Health, Safety and Security (AU), Office of Environmental Protection and ES&H Reporting
Grant/Contract Number:
SC0008468
OSTI ID:
1440551
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 120, Issue 15; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (4)

A survey of the atmospheric physical processes key to the onset of Arctic sea ice melt in spring journal September 2018
Anthropogenic Aerosol Influences on Mixed-Phase Clouds journal February 2017
The Intraseasonal and Interannual Variability of Arctic Temperature and Specific Humidity Inversions journal April 2019
Anthropogenic Aerosol Influences on Mixed-Phase Clouds text January 2017

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