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Title: Understanding Rapid Changes in Phase Partitioning between Cloud Liquid and Ice in Stratiform Mixed-Phase Clouds: An Arctic Case Study

Understanding phase transitions in mixed-phase clouds is of great importance because the hydrometeor phase controls the lifetime and radiative effects of clouds. These cloud radiative effects have a crucial impact on the surface energy budget and thus on the evolution of the ice cover, in high altitudes. For a springtime low-level mixed-phase stratiform cloud case from Barrow, Alaska, a unique combination of instruments and retrieval methods is combined with multiple modeling perspectives to determine key processes that control cloud phase partitioning. The interplay of local cloud-scale versus large-scale processes is considered. Rapid changes in phase partitioning were found to be caused by several main factors. Some major influences were the large-scale advection of different air masses with different aerosol concentrations and humidity content, cloud-scale processes such as a change in the thermodynamical coupling state, and local-scale dynamics influencing the residence time of ice particles. Other factors such as radiative shielding by a cirrus and the influence of the solar cycle were found to only play a minor role for the specific case study (11–12 March 2013). Furthermore, for an even better understanding of cloud phase transitions, observations of key aerosol parameters such as profiles of cloud condensation nucleus and icemore » nucleus concentration are desirable.« less
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [7]
  1. Leibniz Inst. for Troposheric Research, Leipzig (Germany)
  2. Univ. of Colorado, Boulder, CO (United States)'. Cooperative Inst. for Research in Environmental Sciences
  3. Stony Brook Univ., NY (United States). School of Marine and Atmospheric Sciences
  4. European Center for Medium-Range Weather Forecasts, Reading (United Kingdom)
  5. Univ. of Wyoming, Laramie, WY (United States). Dept. of Atmospheric Science
  6. Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.
  7. Bureau of Meteorology, Melbourne (Australia)
Publication Date:
Report Number(s):
Journal ID: ISSN 0027-0644; R&D Project: 2016-BNL-EE630EECA-Budg; KP1701000
Grant/Contract Number:
SC00112704; SC0013306; SC0011918; SC0005259; SC0013953; SC0006974; SC0014239
Accepted Manuscript
Journal Name:
Monthly Weather Review
Additional Journal Information:
Journal Volume: 144; Journal Issue: 12; Journal ID: ISSN 0027-0644
American Meteorological Society
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; Arctic; Cloud retrieval; Lidars/Lidar observations; Radars/Radar observations; Remote sensing; Climate models
OSTI Identifier: