Affiliation:
1. College of Atmospheric Sounding, Chengdu University of Information Technology, Chengdu 610225, China
2. Key Laboratory of Atmosphere Sounding, China Meteorological Administration, Chengdu 610225, China
3. CMA Meteorological Observation Centre, China Meteorological Administration, Beijing 100081, China
Abstract
This research investigates Southwest Vortex (SWV) events in China’s Sichuan Basin using Fengyun-4A (FY-4A) and Global Precipitation Mission (GPM) observations. We selected representative cloud systems and precipitation cases, divided into developing, mature, and dissipating stages. Detailed analysis revealed critical characteristics of precipitation cloud systems at each stage. Our findings reveal that (1) during the SWV’s developing and mature stages, a high concentration of water particles and ice crystals stimulates precipitation. In contrast, the dissipating stage is marked by fewer mixed-phase and ice particles, reducing precipitation area and intensity. (2) Near-surface precipitation in all stages is predominantly liquid, with a bright band of around 5.5 km. At the same time, stratiform precipitation is dominant in each life stage. Stratiform precipitation remains dominant throughout the life stages of the SWV, with localized convective activity evident in the developing and mature stages. (3) Mature stage particles, characterized by a configuration of 1.0–1.2 mm Dm and 31–35 dBNW (dBNW = 10log10NW), contribute significantly to near-surface precipitation. The Cloud Top Height (CTH) serves as an indicator of convective intensity and assists in characterizing raindrop concentration. These findings considerably enhance routine observations, advance our understanding of SWV events, and propose a novel approach for conducting refined observational experiments.
Funder
the Key R&D Program of the Yunnan Provincial Department of Science and Technology
the Project of the Sichuan Department of Science and Technology
the Key Laboratory of Atmospheric Sounding Program of China Meteorological Administration
the Key Grant Project of Science and Technology Innovation Capacity Improvement Program of CUIT
the Second Comprehensive Scientific Investigation of Tibetan Plateau-Extreme Weather and Climate Events and Disaster Risk by the Ministry of Science and Technology
the Key Laboratory of atmospheric Souning and the Atmospheric Sounding Engineering Technology Research Center of the China Meteorological Administration
the Opening Foundation of Key Laboratory of AtmosphereSounding, the China Meteorological Administration and the CMA Research Centre on MeteorologicaObservation Engineering Technology
Subject
General Earth and Planetary Sciences
Reference57 articles.
1. Yan, Y., Wang, H., Li, G., Xia, J., Ge, F., Zeng, Q., Ren, X., and Tan, L. (2022). Projection of Future Extreme Precipitation in China Based on the CMIP6 from a Machine Learning Perspective. Remote Sens., 14.
2. Relationships Between Rapid Urbanization and Extreme Summer Precipitation Over the Sichuan–Chongqing Area of China;Wang;Front. Earth Sci.,2022
3. Diagnostic Analysis of the Impact of Atmospheric River in a Persistent Heavy Rainfall in Sichuan Basin;Yue;J. Chengdu Univ. Inf. Technol.,2015
4. Evolution characteristics of mesoscale system during “8.11” extremely heavy rainstorm in Sichuan Basin in 2020;Zhou;J. Trop. Meteorol.,2022
5. Yu, S.W., Zhang, L.F., and Wang, Y. (2022). Characteristics of stratospheric gravity waves in an eastward moving Southwest Vortex process. J. Trop. Meteorol.