2010年至2023年洛杉矶盆地的CH4排放源趋势使用空中测量
Nell B Schafer1,2,3, Jeff Peischl1,2, Eric C Apel4
1Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado 80309, United States.
Environmental science & technology
|November 29, 2025
概括
加利福尼亚州的目标是到2030年将甲 (CH4) 排放量减少40%. 这项研究发现,洛杉矶的甲排放量每年都在下降,主要来自天然气和农业来源,使该地区走上了实现气候目标的道路.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 加利福尼亚州要求到2030年将甲 (CH4) 排放量从2013年的水平降低40%.
- 准确的温室气体库存对于实现气候目标至关重要,特别是对于城市CH4.
- 了解排放源是制定有效减排战略的关键.
研究的目的:
- 为了确定洛杉矶 (LA) 盆地的夏季CH4和C2-C5基排放量.
- 确定和分配洛杉矶盆地CH4排放的主要来源.
- 评估CH4排放的趋势和加利福尼亚2030年气候目标的进展.
主要方法:
- 在洛杉矶盆地空中实地测量CH4和基 (2010,2019,2023年).
- 从现场测量中分析CH4和与CO的增强比率.
- 与加利福尼亚空气资源局的二氧化碳排放清单和特定部门的基数据进行整合,以进行来源分配.
主要成果:
- 洛杉矶盆地CH4排放量每年下降7.2±5.8Gg/年.
- 天然气 (52-57%) 和CH4主导的来源,如垃圾填埋场/乳制品 (41-47%) 是主要的CH4排放者.
- 发现乙排放量每年增加 (0.13 ± 0.19 Gg/年),与管道天然气成分相关.
结论:
- 观察到的CH4排放下降趋势表明洛杉矶盆地正在朝着加利福尼亚2030年减排目标取得进展.
- 天然气和农业/废物部门是洛杉矶盆地CH4排放的主要贡献者.
- 持续监测和减排工作对于实现气候目标的持续进展至关重要.
相关概念视频
Gas Chromatography: Types of Detectors-II
1.0K
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
1.0K
Measurement of Air Content in Concrete
556
Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
The pressure method,...
556


