Size-resolved carbonaceous aerosols at near surface level and the hilltop in a typical valley city, China
Size-resolved carbonaceous aerosols at near surface level and the hilltop in a typical valley city, China
复制标题
中国典型山谷城市近地表和山顶的尺寸分辨碳质气溶胶
DOI：
10.1016/j.apr.2019.09.022
复制
发表时间：
2020
影响因子：
4.5
通讯作者：
Li Ping
中科院分区：
文献类型：
--
作者：
Zhao Suping;Yu Ye;Du Zhiheng;Yin Daiying;Yang Jiancai;Dong Longxiang;Li Ping
由于缺乏光吸收气溶胶垂直分布数据，很大程度上限制了对中国城市严重灰霾污染形成机制的揭示。基于兰州市近地面和山顶（海拔620 m左右）碳气溶胶粒径分布的同步观测资料和气象资料，比较了两个海拔高度上的有机碳和元素碳（OC、EC）粒径分布特征，揭示了典型城市河谷地区碳气溶胶粒径分布的主要影响因素。冬季有机碳粒径分布呈双峰型，在积累型和粗粒型中有两个可比较的峰值，而夏季有机碳粒径分布呈单峰型，在4.7-5.8 μm的粒径区间中最高。近地表的粒径分辨OC和EC显著高于山顶。夏季表层和山顶有机碳和无机碳的浓度和粒径分布的差异远小于冬季，这主要是由于夏季山顶有机碳的垂直混合作用较强，且贡献较大。与城市山谷平行的风有利于污染物从近地面向高空扩散。水平和垂直扩散的碳气溶胶的作用在近地面相当，而水平扩散是更重要的山顶。此外，垂直扩散是一个主要因素控制的尺寸分辨碳气溶胶在高污染条件下，在一个典型的城市山谷。该研究将为复杂地形条件下严重灰霾污染的调控提供依据。
The lack of light–absorbing aerosols vertical distributions data largely limited to revealing the formation mechanism of severe haze pollution in Chinese cities. Based on the synchronous measurements of size–resolved carbonaceous aerosols and meteorological data at near surface level and hilltop (about 620 m above the valley) in Lanzhou of northwest China, this study compared organic and elemental carbon (OC, EC) size distributions at the two altitudes and revealed the key influencing factors in a typical urban valley, China. The winter OC size distributions were typically bimodal with two comparable peaks in the accumulation and coarse modes, while those in summer were unimodal with the highest value in the size bin of 4.7–5.8 μm. The size-resolved OC and EC at near the surface were significantly higher than those at the hilltop. The difference (concentrations and size distributions) of OC and EC between the surface and hilltop in summer was much smaller than that in winter due to stronger vertical mixing and larger summer SOC contributions at the hilltop. The winds paralleling with running urban valley were conducive to dispersing the air pollutants from near the surface to the upper air. The roles of horizontal and vertical dispersions to carbonaceous aerosols were comparable at near the surface, while horizontal dispersion was more important at the hilltop. Furthermore, the vertical dispersion was a main factor controlling size–resolved carbonaceous aerosols under highly polluted conditions in a typical urban valley. This study will provide the basis for regulation of severe haze pollution over complex terrain.
登录
查看更多内容
影响因子：
5.5
作者：
L. Venegas;N. Mazzeo
通讯作者：
L. Venegas;N. Mazzeo
DOI：
10.1016/j.scitotenv.2012.05.058
发表时间：
2012-08
期刊：
The Science of the total environment
影响因子：
--
作者：
P. Safai;M. Prudhvi Raju;R. Maheshkumar;J. Kulkarni;P. Rao;P. Devara
通讯作者：
P. Safai;M. Prudhvi Raju;R. Maheshkumar;J. Kulkarni;P. Rao;P. Devara
预计住宅排放将成为中国长三角地区冬季细颗粒物的主要来源
影响因子：
15.7
作者：
Wu, Yujie;Wang, Peng;Seinfeld, John H.
通讯作者：
Seinfeld, John H.
DOI：
--
发表时间：
2001
期刊：
China Environmental Science
影响因子：
--
作者：
Z. Qiang
通讯作者：
Z. Qiang
影响因子：
5
作者：
TURPIN, BJ;HUNTZICKER, JJ
通讯作者：
HUNTZICKER, JJ