Measurements of submicron particles vertical profiles by means of topographic relief in a typical valley city, China
Measurements of submicron particles vertical profiles by means of topographic relief in a typical valley city, China
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中国典型河谷城市亚微米颗粒垂直剖面的地形起伏测量
DOI：
10.1016/j.atmosenv.2018.11.035
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发表时间：
2019-02
影响因子：
5
通讯作者：
Li Ping
中科院分区：
文献类型：
--
作者：
Zhao Suping;Yu Ye;Qin Dahe;Yin Daiying;Du Zhiheng;Li Jianglin;Dong Longxiang;He Jianjun;Li Ping
为揭示兰州市典型城市谷地PM 1垂直分布特征及其主要影响因素，于2017年12月26日至2018年1月11日，利用中等体积空气采样器在兰州市城区5个不同海拔高度利用高地形地貌采集了白天和夜间PM 1（直径小于1 μm的颗粒物）样品。用微波辐射计观测了边界层温度和湿度的同步廓线。白天的PM 1浓度随地面高度增加100 m而减少约3.86 μg m− 3，远低于夜间的5.68 μg m−3100 m−1，因为夜间空气稳定时，颗粒物容易在地面附近积聚。利用K均值聚类技术对3种典型的PM 1垂直廓线进行了识别。近地面PM 1浓度升高的最常见簇与地面附近的逆温密切相关，而边界层内PM 1浓度相对均匀的簇主要是由不稳定的大气层结和相对良好的垂直扩散引起的。山谷型城市近地面大气层结对PM 1的贡献率约为50%~ 60%，远高于山顶型城市。当逆温层厚度（强度）增加100 m（1 °C 100 m−1）时，PM 1差值增加47.14（36.91）μg m− 3。新计算的逆温指数考虑逆温层的厚度和强度解释了约87%的近地面和山顶之间的PM 1差异。近地面垂直扩散对PM 1的影响大于水平扩散，而山顶水平扩散对PM 1的影响更大，这与山谷地形密切相关。
To reveal PM1vertical profiles and key affecting factors in a typical urban valley, daytime and nighttime PM1(the particles with diameters less than 1 μm) samples were collected with medium volume air samplers during 26 December 2017 to 11 January 2018 at five different altitudes by means of high topographic relief at urban areas of Lanzhou. The synchronous boundary layer temperature and humidity profiles were observed by a microwave radiometer. Daytime PM1concentrations reduced by about 3.86 μg m−3when the height above the surface increased by 100 m, which was much lower than that for nighttime (5.68 μg m−3100 m−1) as particles were easily accumulated near the surface when the air was stable during the nighttime. The three typical PM1vertical profiles were identified by K-means clustering technique. The most frequent cluster with elevated PM1concentrations near the surface was closely related to temperature inversion around the ground, while the cluster with relatively uniform PM1within the boundary layer was mainly induced by unstable atmospheric stratification and thus relatively good vertical dispersion. About 50%–60% of PM1variations could be attributed to atmospheric stratification near the surface in the valley city, which was much higher than that at the hilltop. The PM1difference increased by 47.14 (36.91) μg m−3when inversion layer thickness (intensity) increased by 100 m (1 °C 100 m−1). The newly calculated inversion index considering both inversion layer thickness and intensity explained about 87% of PM1differences between near the surface and at the hilltop. The vertical dispersion had a more significant effect on PM1than horizontal dispersion near the surface, while PM1was more largely affected by horizontal dispersion at the hilltop, which was closely related to the valley terrain.
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影响因子：
5
作者：
Y. Noh;Kwonho Lee;Kwanchul Kim;Sung-Kyun Shin;D. Müller;Dongho Shin
通讯作者：
Y. Noh;Kwonho Lee;Kwanchul Kim;Sung-Kyun Shin;D. Müller;Dongho Shin
源自塔克拉玛干和戈壁沙漠的两次对比沙尘事件期间的城市颗粒尺寸分布
影响因子：
8.9
作者：
Zhao Suping;Yu Ye;Xia Dunsheng;Yin Daiying;He Jianjun;Liu Na;Li Fang
通讯作者：
Li Fang
2013-2016年中国西部某石化工业化山谷城市颗粒物和气态污染物
DOI：
10.1007/s11356-018-1670-6
发表时间：
2018-03
期刊：
Environ Sci Pollut Res
影响因子：
--
作者：
Zhou Xi;Zhang Tingjun;Li Zhongqin;Tao Yan;Wang Feiteng;Zhang Xin;Xu Chunhai;Ma Shan;Huang Ju
通讯作者：
Huang Ju
影响因子：
8
作者：
J. G. Galway
通讯作者：
J. G. Galway
影响因子：
5
作者：
Chew, Boon Ning;Campbell, James R.;Liew, Soo Chin
通讯作者：
Liew, Soo Chin