Scholarlink

<p>The spatial variability in the atmospheric CO<sub>2</sub> and CH<sub>4</sub> concentrations in urban land is affected by the source type, source distribution, and emission intensity in the cityscape. In this study, we analyzed vehicle-mounted measurements of street-level CO<sub>2</sub> and CH<sub>4</sub> concentrations in Hangzhou—a large metropolitan area in the Yangtze River Delta in eastern China. The results revealed that CO<sub>2</sub> and CH<sub>4</sub> emission hotspots did not overlap geographically, with the former occurring as linear features at elevated road intersections and expressways and the latter occurring at waste treatment facilities (sewage treatment plants and landfills). The CH<sub>4</sub>:CO<sub>2</sub> emission ratios (ppb ppm<sup>−1</sup>) were ranked in increasing order as follows: traffic (1.01 ± 1.82; mean ± 1 SD); overall (3.46 ± 2.71); sewage treatment (12.76 ± 2.50); and landfill (36.50 ± 10.15). Waste treatment was largely responsible for the increased overall emission ratio, supporting this source category as a major contributor to the CH<sub>4</sub> budget in this city and suggesting a negligible role of domestic appliances (cookstoves and water heaters). A two-source mixing model calculation indicated that 99.9% of nonelectric vehicles in Hangzhou were gasoline-powered, revealing a recent shift in vehicle fuel composition from gasoline/natural gas to gasoline/electricity. The methodology established in this study is applicable to cities elsewhere.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mobile Observations of Intracity Variations in Atmospheric CO2 and CH4

  • 期刊论文

  • 发表日期：

    2026年3月7日

查看全文
  • Jun Wang,
  • Wei Xiao,
  • Ning Hu,
  • Ruonan Li,
  • Honghui Xu,
  • Yibo Liu,
  • Lingbing Bu,
  • Longlong Chen,
  • Yuanze Liu,
  • Xuhui Lee

摘要

The spatial variability in the atmospheric CO2 and CH4 concentrations in urban land is affected by the source type, source distribution, and emission intensity in the cityscape. In this study, we analyzed vehicle-mounted measurements of street-level CO2 and CH4 concentrations in Hangzhou—a large metropolitan area in the Yangtze River Delta in eastern China. The results revealed that CO2 and CH4 emission hotspots did not overlap geographically, with the former occurring as linear features at elevated road intersections and expressways and the latter occurring at waste treatment facilities (sewage treatment plants and landfills). The CH4:CO2 emission ratios (ppb ppm−1) were ranked in increasing order as follows: traffic (1.01 ± 1.82; mean ± 1 SD); overall (3.46 ± 2.71); sewage treatment (12.76 ± 2.50); and landfill (36.50 ± 10.15). Waste treatment was largely responsible for the increased overall emission ratio, supporting this source category as a major contributor to the CH4 budget in this city and suggesting a negligible role of domestic appliances (cookstoves and water heaters). A two-source mixing model calculation indicated that 99.9% of nonelectric vehicles in Hangzhou were gasoline-powered, revealing a recent shift in vehicle fuel composition from gasoline/natural gas to gasoline/electricity. The methodology established in this study is applicable to cities elsewhere.