期刊
MONTHLY WEATHER REVIEW
卷 144, 期 12, 页码 4805-4826出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/MWR-D-16-0155.1
关键词
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资金
- DFG project COMPoSE [GZ: KA 4162/1-1]
- U.S. Department of Energy's (DOE's) Atmospheric System Research (ASR) program [DE-SC0008794, DE-SC0013306]
- U.S. National Science Foundation [ARC 1203902]
- DOE-ASR [DE-SC0011918, DE-SC0005259, DE-SC00112704, DE-SC0013953, DE-SC0006974, DE-SC0014239]
- U.S. Department of Energy (DOE) [DE-SC0008794, DE-SC0005259, DE-SC0013953, DE-SC0014239] Funding Source: U.S. Department of Energy (DOE)
Understanding phase transitions in mixed-phase clouds is of great importance because the hydrometeor phase controls the lifetime and radiative effects of clouds. In high latitudes, these cloud radiative effects have a crucial impact on the surface energy budget and thus on the evolution of the ice cover. 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. 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). For an even better understanding of cloud phase transitions, observations of key aerosol parameters such as profiles of cloud condensation nucleus and ice nucleus concentration are desirable.
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