PAN Jie,LI Maoshan,GONG Ming,et al.Characterization of Raindrop Spectra on the Southeast Tibetan Plateau and East Slopes[J].Journal of Chengdu University of Information Technology,2023,38(06):709-719.[doi:10.16836/j.cnki.jcuit.2023.06.013]
青藏高原东南部及东坡雨滴谱特征的研究
- Title:
- Characterization of Raindrop Spectra on the Southeast Tibetan Plateau and East Slopes
- 文章编号:
- 2096-1618(2023)06-0709-11
- 关键词:
- 雨滴谱; 青藏高原东南部及其东坡; Gamma分布; 参数化; 西南涡
- Keywords:
- raindrop distribution; Southeast Tibetan Plateau and its east slope; Gamma distribution; parameterization; Southwest twister
- 分类号:
- P468
- 文献标志码:
- A
- 摘要:
- 为研究青藏高原东南部地区及东坡的云微物理特征，利用2021年青藏高原东坡峨眉山站点以及青藏高原东南部林芝站点雨滴谱仪的观测资料，分析了青藏高原东南部及其东坡不同季节的3类降水云的雨滴谱特征及典型个例降水与西南涡之间的关系。结果表明:峨眉山站点和林芝站点的主要降水类型都为层状云降水，年累计降水量较大，降水持续时间短，降水频次多; 峨眉山站点4个季节对应粒子数浓度峰值的粒径为1.5 mm左右，而林芝站点4个季节对应粒子数浓度峰值的粒径为1 mm左右，其中层状云雨滴谱浓度最低，主要贡献在小粒径上。峨眉山地区的3类云降水在Gamma拟合中，与实测相比模拟较好的粒径区间在1.5～4.0 mm; 而林芝站点的拟合曲线与实测曲线的趋势较为相似，模拟较好的粒径区间在1.3～4.5 mm; 因此，峨眉山站点和林芝站点的雨滴谱在适当范围内是能够运用Gamma分布模拟的。伴随较深厚的气旋性涡旋出现的降水强度较大，48 h累积雨量较大，雨滴谱分布的谱宽较宽，粒子数浓度在小粒径时更高，西南涡的发生发展造成的降水对本次研究区域的雨滴谱分布有很大的影响。
- Abstract:
- To study the cloud microphysical characteristics of the southeastern Tibetan Plateau and its eastern slope, the raindrop spectrometer observations in 2021 at the Emei Mountain site on the eastern slope of the Tibetan Plateau and the Linzhi site on the southeastern Tibetan Plateau were used to analyze the raindrop spectral characteristics of three types of precipitation clouds in different seasons on the southeastern Tibetan Plateau and its eastern slope and the relationship between typical individual cases of precipitation and The relationship between the southwestern vortex and the typical precipitation cases were analyzed. The results show that both the Emei Mountain and Linzhi sites experience stratiform cloud precipitation as their main precipitation type. The annual cumulative precipitation is higher, the precipitation duration is shorter, and the precipitation is more frequent. The particle size corresponding to the peak particle number concentration is about 1.5 mm in four seasons at the Emei Mountain site, while the particle size corresponding to the peak particle number concentration is about 1 mm in four seasons at the Linzhi site, where the lowest concentration of stratiform cloud raindrop spectrum is mainly contributed to the small particle size.In the Gamma fit for the three types of cloud precipitation in the Emei Mountain area, the better-simulated particle size interval is between 1.5 mm and 4.0 mm, compared to the measured data. However, the fitted curve for the Linzhi site has a more similar trend to the measured data, and the better-simulated particle size interval is between 1.3 mm and 4.5 mm. Therefore, the raindrop spectra of the Emei Mountain site and the Linzhi site are within the appropriate range to be able to apply Gamma distribution simulations are possible. The precipitation accompanying the deeper cyclonic vortex appears to be more intense, the 48 h accumulated rainfall is larger, the spectral width of the raindrop spectrum distribution is wider, and the particle number concentration is higher at small particle size, and the precipitation caused by the development of the southwest vortex has a great influence on the raindrop spectrum distribution in this study area.
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备注/Memo
收稿日期:2022-11-01
基金项目:四川省自然科学基金资助项目(2022NSFSC0217); 第二次青藏高原综合科学考察研究资助项目(2019QZKK0103); 国家重点研发计划资助项目(2017YFC1505702); 国家自然科学基金资助项目(42230610、41675106)
通信作者:李茂善.Email:lims@cuit.edu.cn