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DOI | 10.1016/j.atmosres.2018.02.013 |
The effect of ice nuclei on a deep convective cloud in South China | |
Deng, Xin; Xue, Huiwen; Meng, Zhiyong | |
2018-07-01 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 206页码:1-12 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | This study uses the Weather Research and Forecasting Model to simulate a deep convective cloud under a relatively polluted condition in South China. Ice nuclei (IN) aerosols near the surface are effectively transported upwards to above the 0 degrees C level by the strong updrafts in the convective cloud. Four cases with initial surface IN aerosol concentrations of 1, 10, 100, and 1000 L-1 are simulated. All simulations can well reproduce the major characteristics of the deep convective cloud in terms of the evolution, spatial distribution, and its track. IN aerosols have little effect on these macrophysical characteristics but can significantly affect ice formation. When IN concentration is increased, all heterogeneous nucleation modes are significantly enhanced, whereas the homogeneous freezing of cloud droplets is unchanged or weakened depending on the IN concentration and the development stages of the deep convective cloud. The homogeneous freezing of haze particles is generally not affected by increased IN but is slightly weakened in the extremely high IN case. As IN concentration is increased by 10 and 100 times, the enhanced heterogeneous nucleation is still not strong enough to compete with homogeneous freezing. Ice formation is hence still dominated by the homogenous freezing of cloud droplets and haze particles in the layer of 9-14 km, where most of the ice crystals are produced. The microphysical properties are generally unaffected in all the stages of cloud evolution. As IN concentration is increased by 1000 times and heterogeneous nucleation is further enhanced, the homogeneous freezing of cloud droplets and haze particles dominates only in the mature and dissipating stages, leading to unaffected ice number mixing ratio in the anvil region (approximately above 9 km) for these two stages. However, in the developing stage, when the supply of cloud droplets is limited, the homogeneous freezing of cloud droplets is weakened or even suppressed due to the very strong competition for liquid water with heterogeneous nucleation, leading to significantly lower ice number mixing ratio in the anvil regions. In addition, the microphysical properties in the convective core regions below the cloud anvil (approximately below 9 km) are also affected in the case of 1000 L-1. The enhanced heterogeneous nucleation produces more ice crystals below 9 km, leading to a stronger conversion from ice crystals to snow particles, and hence higher number and mass mixing ratios of snow. The IN effect on the spatial distributions and temporal evolutions of the surface precipitation and updraft velocity is generally insignificant. |
英文关键词 | Ice nuclei Deep convective cloud Vertical transport Ice nucleation Homogeneous freezing Heterogeneous nucleation |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000430765000001 |
WOS关键词 | NUMERICAL-MODEL SIMULATIONS ; ANVIL-CIRRUS CLOUDS ; NUCLEATING AEROSOL ; PART I ; PARAMETERIZATION ; ELECTRIFICATION ; MICROPHYSICS ; IMPACTS ; PARTICLES ; SYSTEM |
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/38328 |
专题 | 地球科学 |
作者单位 | Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Room 518 North,Phys Bldg,209 Chengfu Rd, Beijing 100871, Peoples R China |
推荐引用方式 GB/T 7714 | Deng, Xin,Xue, Huiwen,Meng, Zhiyong. The effect of ice nuclei on a deep convective cloud in South China[J]. ATMOSPHERIC RESEARCH,2018,206:1-12. |
APA | Deng, Xin,Xue, Huiwen,&Meng, Zhiyong.(2018).The effect of ice nuclei on a deep convective cloud in South China.ATMOSPHERIC RESEARCH,206,1-12. |
MLA | Deng, Xin,et al."The effect of ice nuclei on a deep convective cloud in South China".ATMOSPHERIC RESEARCH 206(2018):1-12. |
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