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京津冀中部夏季大气颗粒物空间分布特征研究
孟凡胜1, 王飞2,2, 殷宝辉3, 耿春梅3, 杨文3, 任丽红3, 李伟1, 白志鹏3
1.山西大学;2.北京市人工影响天气办公室;3.中国环境科学研究院
摘要:
摘要:以运12(Y12)飞机为大气颗粒物观测平台,对2016年夏季京津冀中部大气颗粒物污染特征进行了观测研究.观测发现,天津市颗粒物数浓度垂直分布特征为1500 m(以下均为标准气压高度)以下呈单峰分布,1500 m以上呈单调下降,峰值均出现在0.35?0.4μm之间,峰值的最大值出现在900 m左右;颗粒物体积浓度谱呈三峰分布,分别在0.3?0.4 μm、0.5?0.6 μm和1?2 μm之间,峰值的最大值出现在450 m左右.天津、保定和衡水市600 m与2400 m数浓度谱分布特征为单调下降和单峰分布并存;600 m表面积浓度谱呈三峰分布,分别在0.3?0.4 μm、0.5?0.6 μm和0.9?1 μm之间.2400 m表面积浓度谱呈双峰分布,分别在0.3?0.4 μm和0.5?0.6 μm之间; 600 m与2400 m体积浓度谱均呈三峰分布, 分别在0.3?0.4 μm、0.5?0.6 μm和1?3μm之间. 天津市大气颗粒物数浓度谱峰值的最大值出现在900 m左右,发现逆温层对气溶胶累积的形成有重要影响;天津市地面至2200 m颗粒物体积浓度谱峰值的最大值出现在450 m左右.京津冀中部600 m与2400 m空中大气颗粒物数浓度谱分布特征为单调下降和单峰分布并存.城市间数浓度谱峰值高低受地面颗粒物质量浓度大小影响.京津冀中部大气颗粒物表面积浓度谱在600 m呈三峰分布, 在2400 m呈双峰分布,可能是因为2400 m空中以细粒子为主.京津冀中部大气颗粒物体积浓度谱在600 m与2400 m空中均为三峰分布,而国外为双峰分布,发现粗粒子峰值粒径范围差别较大,这是由于国内PM2.5在PM10中占比较大.京津冀中部600 m和1200 m大气颗粒物多来源于山东、河南省经近地面输送而来,2400 m大气颗粒物多来源于内蒙古地区经高空和近地面两种途径输送而来.
关键词:  大气颗粒物  飞机观测  数浓度  粒径谱分布  京津冀区域
DOI:
分类号:
基金项目:国家重大科学仪器设备开发专项(2011YQ060111);国家科技支撑计划课题(2014BAC23B01);中央级公益性科研院所基本科研业务专项(2016YSKY-023)
Spatial Distribution Properties of Atmospheric Particles over central Beijing- Tianjin- Hebei Region in Summer
MENG Fansheng1, WANG Fei2, YIN Baohui3, GENG Chunmei3, YANG Wen3, REN Lihong3, LI Wei1, BAI Zhipeng3
1.College of Environment Resource Sciences of Shanxi University;2.Beijing weather modification office;3.State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences
Abstract:
Abstract: Taking the Yun12 (Y12) plane as the observation platform of atmospheric particulate matter, aircraft measurements of aerosol properties in central Beijing- Tianjin -Hebei Region were carried out in the summer of 2016. It was found that the concentration spectrum under 1500 m (The heights in the following were all standard pressure height.) was unimodal distribution which ranged from 0.35 to 0.4 μm, while the concentration spectrum of above 1500 m was monotonically decreasing. The maximum value of the peak was about 900 m. The volume concentration spectrum under 2200 m was trimodal distribution, which ranged from 0.3 to 0.4 μm, 0.5 to 0.6 μm, 1 to 2 μm respectively. The maximum value of the peak occered at around 450 m.The concentration spectrum of 600m and 2400m atmospheric particles in Tianjin, Baoding and Hengshui were single-peak distribution and monotonically decreasing. The concentration spectrum of 600 m surface area was trimodal distribution in Tianjin, Baoding and Hengshui, which ranged from 0.3 to 0.4 μm, 0.5 to 0.6 μm, 1 to 2 μm respectively. The surface area concentration spectrum of 2400 m in Tianjin, Baoding and Hengshui was bimodal distribution, one of which ranged from 0.3 to 0.4 μm, and the other ranges from 0.5 to 0.6 μm. The volume concentration spectrum of 600 m and 2400 m in Tianjin, Baoding and Hengshui were trimodal distribution, which ranged from 0.3 to 0.4 μm, 0.5 to 0.6 μm, 1 to 3 μm respectively. The vertical distribution characteristics of Tianjin were in the single peak distribution of the concentration spectrum under 1500 m which appeared in the accumulation mode, and the concentration spectrum above 1500 m was monotonically decreasing. The maximum value of the peak was about 900 m. It was found that the inversion layer had an important influence on the formation of aerosol accumulation. The volume concentration spectrum under 2200 m was trimodal distribution. The maximum value of the peak was around 450 m. The distribution characteristics of concentration spectrum distribution over Beijing- Tianjin -Hebei Region were the same as those of the atmospheric airborne particles of 600 m and 2400 m, showing a monotonously decreasing and unimodal distribution. The differences in the peak of concentration spectrum between different cities were affected by the ground mass concentration of particles. The surface area concentration spectrum of 600 m and 2400 m in central Beijing- Tianjin -Hebei Region were trimodal distributions and bimodal distribution respectively, owning to it was dominated by fine particles in the air of 2400 m. The volume concentration spectrum of 600 m and 2400 m in central Beijing- Tianjin -Hebei Region were trimodal distributions, nevertheless, studies from foreign countries observed bimodal distribution. It was found that there were much differences between crest value of size range of coarse particles, due to higher value of PM2.5/PM10 ratio in our country. The atmospheric particles of 600 m and 1200 m in central Beijing- Tianjin -Hebei Region were mostly transported from Shandong and Henan provinces near the ground. The atmospheric particles of 2400 m in central Beijing- Tianjin -Hebei Region were mostly transported from Inner Mongolia area by two ways of high aititude and near the ground.
Key words:  Atmospheric particles  aircraft measurement  number concentrations  aerosol property distributions  Beijing- Tianjin -Hebei Region