| 2000~2018年京津冀城市群PM2.5时空演变及其与城市扩张的关联 |
| 摘要点击 2576 全文点击 732 投稿时间：2021-09-26 修订日期：2021-10-21 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 PM2.5 时空演变 城市发展强度 城镇用地 京津冀城市群 |
| 英文关键词 PM2.5 spatio-temporal patterns urban intensity urban land Beijing-Tianjin-Hebei urban agglomeration |
|
| 中文摘要 |
| 京津冀城市群是中国三大城市群之一，其城市化进程对大气污染造成了严重的影响.基于土地利用、站点实测和遥感反演的PM2.5浓度数据集，辅以趋势分析和分段线性回归等方法，分析了2000~2018年京津冀城市群PM2.5浓度的时空演变格局及其与城市扩张的关联.结果表明：① 2000~2018年京津冀城市群PM2.5浓度变化呈明显的阶段特征，2000~2013年PM2.5浓度呈显著增加的趋势[slope=1.5980 μg ·（m3 ·a）-1，P<0.001]，其中69.97%的区域呈显著增加趋势（P<0.05）；2013~2018年PM2.5浓度呈显著减小的趋势[slope=-4.9908 μg ·（m3 ·a）-1，P<0.001]，其中85.81%的区域呈显著减小的趋势（P<0.05）；② PM2.5浓度整体呈从东南向西北递减的趋势，高污染区[ρ（PM2.5）>70μg ·m-3]主要集中在河北省的中南部地区.从不同的区域来看，老城区（74.71μg ·m-3）>城市区域（72.72μg ·m-3）>新扩张城区（70.35μg ·m-3）>非城市区域（45.49μg ·m-3）；③京津冀城市群13个城市PM2.5浓度随城市发展强度（UI）的增加均呈显著增加的趋势（P<0.05）.从老城区和新扩张城区对比来看，2000年和2018年老城区的PM2.5浓度高于新扩张城.结果可为京津冀大气污染治理提供科学依据. |
| 英文摘要 |
| The Beijing-Tianjin-Hebei urban agglomeration is one of the most important urban agglomerations in China, and the urbanization process has had a serious impact on air pollution. Exploring the relationship between urban expansion and fine particulate matter (PM2.5) is crucial for air pollution prevention policy formulation and the health of urban residents. Land use, PM2.5 data from ground-based monitoring, and remote sensing inversion from 2000 to 2018 were utilized to evaluate the spatio-temporal patterns of PM2.5 concentrations and their relationships with urban expansion by trend analysis, the Mann Kendall nonparametric test, and a piecewise regression model. The results showed that:① In general, two distinct periods existed with opposite trends; the positive trend[slope=1.5980 μg·(m3·a)-1, P<0.001]over 2000-2013 and the negative trend[slope=-4.9908 μg·(m3·a)-1, P<0.001)]over 2013-2018 were noteworthy in the Beijing-Tianjin-Hebei urban agglomeration. From 2000 to 2013, Mann-Kendall nonparametric test results showed that PM2.5 concentrations in 69.97% of the area increased significantly (P<0.05). However, PM2.5 concentrations in 85.81% of the area decreased significantly during 2013-2018. ② In terms of spatial variation, PM2.5 was strikingly uneven and had a decreasing trend from southeast to northwest in the Beijing-Tianjin-Hebei urban agglomeration, with a higher concentration (PM2.5>70 μg·m-3) in central and southern Hebei Province. The PM2.5 concentrations of the urban, old urban, new urban, and non-urban areas from 2000 to 2018 demonstrated the following order:old urban (74.71 μg·m-3)>urban (72.72 μg·m-3)>new urban (70.35 μg·m-3)>non-urban (45.49 μg·m-3). Human activities in old urban areas had a more significant impact on air pollution. ③ PM2.5 concentrations in 2000 and 2018 increased significantly (P<0.05), with elevating urban intensity (UI) for all the cities in the Beijing-Tianjin-Hebei urban agglomeration. Comparing the old and new urban areas, PM2.5 concentrations in old urban areas were significantly higher than those in new urban areas in 2000 and 2018. These results can offer scientific basis for air pollution control in the Beijing-Tianjin-Hebei urban agglomeration. |
|
|
|
