• CN 62-1175/P
• ISSN 1006-7639

### Characteristics of a Continuous Fog and Haze Weather in Nanjing and Its Causes

PENG Shuling1, ZHOU Shudao1,2, WANG Min1,2, REN Shangshu1, SHEN Ao1

1. 1. College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China;
2.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China
• Online:2018-04-30 Published:2018-04-30

### 南京市一次雾霾天气过程的阶段性特征与成因

1. 1.国防科技大学气象海洋学院，江苏南京211101；
2.南京信息工程大学气象灾害预警与评估协同创新中心，江苏南京210044
• 作者简介:彭舒龄（1994— ）,女,重庆涪陵人, 主要从事大气辐射与遥感研究. E-mail:pengshuling0216@163.com。
• 基金资助:

国家自然科学基金项目（91544230、41775039、41775165）资助

Abstract:

Based on the hourly ground conventional observation data, hourly PM2.5 concentration, aerosol optical depth (AOD) from MODIS products, CALIPSO data in Nanjing and nearby areas and NCEP reanalysis data, the characteristics of a continuous fog and haze weather pollution episode from 4 to 9 December 2016 in Nanjing of Jiangsu Province were analyzed. The results showed that the continuous fog and haze weather had obvious regional features, the aerosols in Nanjing and nearby areas were mainly made from dust, polluted dust and continental pollutant, and the pollutants were mainly transported from Northwest China and discharged by the local people. The circulation background with uniform weak high pressure field on the ground and steady synoptic systems at high levels caused the fog and haze weather episode. Meanwhile, the divergence downdraft airflow controlled over Nanjing area, which was beneficial to maintenance of inversion layer, and then made the fog and haze weather to develop. With the invasion of cold air from the northerly wind, the positive vorticity advection controlled over Nanjing, which was beneficial to the weakening and disappearing of fog and haze. Moreover, the temperature advection affected the condensation of water vapor and relative humidity, thus led to the change of visibility.

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