摘要
利用潜在源区贡献法计算了合肥市2015年冬季传输指数,并基于传输指数和PM_(2.5)浓度将合肥市的重污染过程划分为3类,同时对各类重污染过程进行气象成因分析.结果表明:污染物传输型重污染过程的传输指数明显增大且PM_(2.5)浓度急剧增大;污染物积累型重污染过程的传输指数无明显增大且PM_(2.5)浓度逐渐增大;污染物暴发性排放型重污染过程的传输指数无明显增大但PM_(2.5)浓度急剧增大.污染物传输型重污染过程主要是高压南下迫使北方重污染气团输送引起的;污染物积累型重污染过程主要是静稳的天气形势导致污染物堆积造成的;污染物爆发性排放型重污染过程是由污染物暴发性排放而无法及时扩散引起的.
In this study, the transport index was calculated with PSCF for heavy air pollution in Hefei during winter in 2015. Based on the transport index and PM2.5 concentration, the heavy air pollution events were classified into three types, i.e. ＂transport type＂, ＂accumulation type＂, and ＂explosion type＂. Results showed that for ＂transport type＂, the transport index and PM2.5 concentration increased rapidly. However, gradual increase of PM2.5 concentration and no significant increase in the transport index were observed in ＂ accumulation type＂. In comparison, PM2.5 concentration increased dramatically without significant increase in the transport index for ＂explosion type＂. The meteorological conditions played an important role for all types of heavy air pollution. The northern high-pressure center brought the polluted air into Hefei and induced ＂transport type＂ heavy pollution. The ＂accmrtulation type＂ heavy pollution was associated with the poor horizontal and vertical diffusion conditions due to the stability of atmosphere. The ＂explosion type＂ heavy pollution was mainly triggered by sudden massive emissions of pollutants together with the unfavorable atmospheric diffusion and dilution conditions.
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第4期1277-1286,共10页
Acta Scientiae Circumstantiae
基金
淮河流域气象开放研究基金(No.HRM201508)
安徽省环保科研项目(No.2016-04)
公益性行业(气象)专项(No.GYHY201406039)
安徽省自然科学基金(No.1408085MKL60)~~
关键词
重污染天气
传输指数
潜在源区贡献
heavy air pollution
transport index
potential source contribution function
