| 鄂尔多斯市夏秋季黑碳气溶胶时间演变特征及其来源解析 |
| 摘要点击 3082 全文点击 1017 投稿时间：2021-10-11 修订日期：2021-11-16 |
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| 中文关键词 鄂尔多斯 黑碳(BC) 气溶胶 潜在来源 日变化 |
| 英文关键词 Ordos black carbon (BC) aerosol potential source appointment diurnal variation |
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| 中文摘要 |
| 使用AE-33于2019年8月12日至10月4日观测了黑碳（BC）浓度，结合PM、污染气体和气象要素数据、HYSPLIT模式、PSCF和CWT模式，分析了BC的时间演变特征、潜在来源及其主要影响区域.结果表明，ρ（BC）平均值为882 ng ·m-3，占PM2.5的质量分数为6.08%.ρ（BC）主要集中在200~1000 ng ·m-3，占总样本数的55.9%.在不同BC浓度范围内，均是以BC液态为主，平均占比为86%.BC和PM2.5浓度的日变化均为单峰型分布，峰值分别位于08：00和10：00，峰值浓度分别增加了24.3%和47.2%.BC固态的日变化为双峰型分布，峰值分别位于08：00和20：00，BC液态的日变化为单峰型分布，峰值位于08：00.BC与NO2的相关性较好，与SO2的相关性较弱，说明BC受交通源的影响较大，受工业源的影响较小.影响鄂尔多斯市的主导气团可分为4类，南部气团（35.6%）、局地气团（26.9%），西北气团（18.8%）和东北气团（18.7%）.鄂尔多斯市对下游地区的影响主要分为东北气团（40.9%）、西北气团（30.4%）和东南气团（28.7%）.BC的CWT高值区主要位于南部的延安-铜川-宝鸡-汉中一带和吕梁-临汾-三门峡-南阳一带，为两条狭长的传输带，权重浓度超过1400 ng ·m-3.BC的CWT高值影响区主要集中在乌海-巴彦淖尔-包头-呼和浩特一带，权重浓度超过900ng ·m-3.BC的远距离输送影响范围可至南部的榆林-延安-铜川-宝鸡一带，东部的朔州-大同-北京一带和东北部的锡林郭勒盟-兴安盟-呼伦贝尔一带. |
| 英文摘要 |
| In this study, black carbon (BC) aerosols were continuously observed using a seven-channel aethalometer (AE-33) in Ordos from August 12 to October 4, 2019; using this data combined with article matter (PM), pollutant gas, and meteorological element data; a HYSPLIT model; and potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) models, we analyzed the temporal evolution and potential source appointment and main influence areas of BC. The results showed that the average of ρ(BC) was 882 ng·m-3, accounting for 6.08% of PM2.5. The ρ(BC) was mainly concentrated at 200-1000 ng·m-3, accounting for 55.9% of the total samples. In different BC mass concentration ranges, BCliquid was the mainstay, with an average proportion of 86%. The diurnal variations in BC and PM2.5 showed unimodal distributions, with peaks at 08:00 and 10:00, respectively, and peak concentrations increased by 24.3% and 47.2%, respectively. The diurnal variation in BCsolid showed a bimodal distribution, with peaks at 08:00 and 20:00, respectively. The diurnal variation in the BCliquid showed a unimodal distribution with a peak at 08:00. The strong correlation between BC and NO2 indicated a greater impact of vehicle emissions on BC concentration, whereas the weak correlation between BC and SO2 indicated a lower impact of industrial emissions on BC concentration. The dominant air masses affecting the Ordos could be divided into four categories. The southern air masses (35.6%) had the highest mass concentration of atmospheric pollutants, followed by the local air masses (26.9%) and the northwest air masses (18.8%), and the northeast air masses (18.7%) had the lowest mass concentration of pollutants. The influence of the Ordos on the downstream areas was mainly divided into the northeast air masses (40.9%), the northwest air masses (30.4%), and the southeast air masses (28.7%). High CWT value areas of BC were mainly located in the southern Yan'an-Tongchuan-Baoji-Hanzhong areas and Lvliang-Linfen-Sanmenxia-Nanyang areas. They were two long and narrow transmission belts with a weight mass concentration exceeding 1400 ng·m-3. High CWT value areas of BC had the greatest impact on the Wuhai-Bayannaoer-Baotou-Hohhot regions, with a weight concentration exceeding 900 ng·m-3. The long-range transportation of BC could reach the Yulin-Yan'an-Tongchuan-Baoji areas in the south, the Shuozhou-Datong-Beijing areas in the east, and the Xilin Gol League-Xing'an League-Hulunbuir areas in the northeast. |
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