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相关概念视频

Global Climate Change01:50

Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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相关实验视频

Updated: Jul 17, 2025

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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洛杉矶甲排放量每十年下降幅度远小于自下而上的估计.

Zhao-Cheng Zeng1, Thomas Pongetti2, Sally Newman3,4

  • 1Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA. zcz@gps.caltech.edu.

Nature communications
|September 2, 2023
PubMed
概括
此摘要是机器生成的。

来自洛杉矶 (LA) 天然气泄漏的甲排放量在2011-2020年期间下降. 这项研究突出了大气测量和公用事业估计之间的差异,为未来的甲减少策略提供了见解.

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科学领域:

  • 大气科学 大气科学
  • 气候变化研究 气候变化研究
  • 环境监测 环境监测

背景情况:

  • 甲是一种强大的温室气体,在大气中寿命很短,因此减排对气候强制的影响很大.
  • 天然气泄漏是洛杉矶等大城市的重要甲来源.
  • 量化逃逸的天然气排放对于验证减排目标至关重要.

研究的目的:

  • 量化洛杉矶地区2011-2020年甲排放趋势.
  • 为了比较自上而下 (遥感) 和自下而上 (公用事业计算) 的甲排放估计.
  • 评估主要城市地区减排战略的有效性.

主要方法:

  • 利用大气遥感数据来监测甲度.
  • 分析了十年 (2011-2020年) 的排放趋势.
  • 将卫星衍生的排放数据与天然气公用事业公司报告的数据进行比较.

主要成果:

  • 洛杉矶地区的甲排放量在2011-2020年间呈现下降趋势 (-1.57 ± 0.41) %/年.
  • 这种自上而下的趋势与观察到的全球甲排放量增加形成鲜明对比.
  • 测量的减排率与天然气公用事业公司报告的更大的负面趋势 (-5.8%/年) 之间存在重大差异.

结论:

  • 自上而下的测量显示,LA的甲排放量有所下降,这表明减排工作取得了一些成功.
  • 上下和自下而上的趋势之间的差异强调了排放估计和报告中的不确定性.
  • 洛杉矶的经验为其他城市和国际努力提供了潜在的典范,如COP28,旨在制甲排放.