Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2018.04.023 |
On the freezing time of supercooled drops in developing convective clouds over tropical ocean | |
Yang, Jing1; Wang, Zhien1; Heymsfield, Andrew2 | |
2018-10-01 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 211页码:30-37 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | to model. Aircraft measurements during the Ice in Clouds-Tropical (ICE-T) project suggest that the observed ice particles in intense convective clouds are primarily small at relatively warm temperature (between - 7 degrees C and -10 degrees C), and large frozen drops are detected at a temperature colder than -10 degrees C. However, the ice particle size distributions (PSDs) between - 7 degrees C and -10 degrees C modelled using a parcel model with spectral bin microphysics scheme are much broader than the observation. To interpret the difference in the temperature-dependent ice PSD evolution between the model simulations and the observations, the freezing times and temperatures of supercooled drops are modelled and analyzed. The results indicate that the freezing time (from the initial nucleation to fully frozen) must be considered; it is not instantaneous, and is longer for large drops than for small drops. In strong updrafts, such as that sampled by the Learjet during ICE-T, large freezing drops may be carried upwards to a temperature lower than their nucleation temperature before they are fully frozen. This offers a feasible explanation for the temperature-dependent ice particle size evolution in strong updrafts observed during ICE-T. In models, drop freezing is normally assumed to be instantaneous, which is not realistic; the models yields broader ice PSDs between - 7 degrees C and -10 degrees C than is observed. The results highlight the importance to consider the freezing time of supercooled drops in interpreting the observed and modelled ice PSDs in growing turrets and in modelling ice generation in cloud resolving models. To better understand the time-dependent drop freezing and its impact on the microphysics and dynamics of convective clouds, more field measurements and laboratory experiments, as well as modelling studies are needed. |
英文关键词 | Drop freezing time Convective cloud Parcel model simulation Aircraft observation |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000436224300004 |
WOS关键词 | SECONDARY ICE ; PRECIPITATION DEVELOPMENT ; WATER DROPS ; MICROPHYSICS ; GROWTH ; PARTICLES ; CUMULUS ; MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/38390 |
专题 | 地球科学 |
作者单位 | 1.Univ Wyoming, Dept Atmospher Sci, Laramie, WY 82071 USA; 2.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Yang, Jing,Wang, Zhien,Heymsfield, Andrew. On the freezing time of supercooled drops in developing convective clouds over tropical ocean[J]. ATMOSPHERIC RESEARCH,2018,211:30-37. |
APA | Yang, Jing,Wang, Zhien,&Heymsfield, Andrew.(2018).On the freezing time of supercooled drops in developing convective clouds over tropical ocean.ATMOSPHERIC RESEARCH,211,30-37. |
MLA | Yang, Jing,et al."On the freezing time of supercooled drops in developing convective clouds over tropical ocean".ATMOSPHERIC RESEARCH 211(2018):30-37. |
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