| 2015—2021年全国地级及以上城市CO浓度时空变化特征 |
| Spatiotemporal Variation Characteristics of CO Concentration in Cities at Prefecture Level and Above in China from 2015 to 2021 |
| 投稿时间：2024-04-09 修订日期：2024-12-03 |
| DOI：10.19316/j.issn.1002-6002.2025.04.04 |
| 中文关键词: 全国主要城市 CO浓度 地理分区 时空变化 |
| 英文关键词:major cities in China CO concentration geographical regions spatiotemporal variation |
| 基金项目:国家重点研发计划项目(2022YFC3703003) |
|
| 通讯作者:李婧妍* 中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012 |
| 摘要点击次数: 496 |
| 全文下载次数: 776 |
| 中文摘要: |
| 通过开展2015—2021年全国地级及以上城市CO浓度时空变化特征分析发现,CO浓度总体呈下降趋势,高百分位浓度下降更加显著。2015—2021年,CO月浓度的年度变化均呈现“U”形特征,其中冬季CO浓度改善幅度超过夏季,年内浓度差异逐步缩小。全国七大地理分区CO浓度分布有着明显的地区性差异,华北、西北、华中3个区域的CO浓度呈逐年下降趋势。分析区域CO小时浓度日变化情况发现,CO浓度均在09:00左右出现峰值,在16:00左右出现谷值。比较不同污染物之间的相关性发现,整体上,全国CO浓度与PM2.5、NO2浓度的相关性较强。 |
| 英文摘要: |
| Through analyzing the spatiotemporal variation characteristics of CO concentrations in cities at prefecture level and above in China from 2015 to 2021,it was found that the overall trend of CO concentrations in Chinese cities exhibited a downward trend,with more significant reduction in high-percentile concentrations.The annual variation of monthly CO concentrations in major Chinese cities exhibited a consistent U-shaped pattern from 2015 to 2021,where improvement in winter CO levels surpassed that in summer,gradually narrowing seasonal disparities.The distribution of CO concentration in the seven major geographic regions of China had obvious regional differences,with North China,Northwest China,and Central China demonstrating more pronounced declines in concentration levels over the study period.Diurnal variation analysis of regional CO concentrations showed consistent peak levels around 09:00 and troughs around 16:00.Comparing the correlation between different pollutants,it was found that the CO concentration was strongly correlated with the PM2.5 and NO2 concentrations in China as a whole. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
