Yadav Vineet, Ghosh Subhomoy, Mueller Kimberly, Karion Anna, Roest Geoffrey, Gourdji Sharon M, Lopez-Coto Israel, Gurney Kevin R, Parazoo Nicholas, Verhulst Kristal R, Kim Jooil, Prinzivalli Steve, Fain Clayton, Nehrkorn Thomas, Mountain Marikate, Keeling Ralph F, Weiss Ray F, Duren Riley, Miller Charles E, Whetstone James
Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA.
Center for Research Computing University of Notre Dame South Bend IN USA.
Geophys Res Lett. 2021 Jun 16;48(11):e2021GL092744. doi: 10.1029/2021GL092744. Epub 2021 Jun 7.
Responses to COVID-19 have resulted in unintended reductions of city-scale carbon dioxide (CO) emissions. Here, we detect and estimate decreases in CO emissions in Los Angeles and Washington DC/Baltimore during March and April 2020. We present three lines of evidence using methods that have increasing model dependency, including an inverse model to estimate relative emissions changes in 2020 compared to 2018 and 2019. The March decrease (25%) in Washington DC/Baltimore is largely supported by a drop in natural gas consumption associated with a warm spring whereas the decrease in April (33%) correlates with changes in gasoline fuel sales. In contrast, only a fraction of the March (17%) and April (34%) reduction in Los Angeles is explained by traffic declines. Methods and measurements used herein highlight the advantages of atmospheric CO observations for providing timely insights into rapidly changing emissions patterns that can empower cities to course-correct CO reduction activities efficiently.
对新冠疫情的应对措施意外导致了城市规模的二氧化碳（CO）排放量减少。在此，我们检测并估算了2020年3月和4月洛杉矶以及华盛顿特区/巴尔的摩的CO排放量下降情况。我们使用了模型依赖性逐渐增强的方法提供三条证据线索，其中包括一个反演模型，用于估算2020年相较于2018年和2019年的相对排放变化。华盛顿特区/巴尔的摩3月的排放量下降（25%）在很大程度上是由于暖春导致天然气消费量下降，而4月的下降（33%）与汽油燃料销售变化相关。相比之下，洛杉矶3月（17%）和4月（34%）排放量的减少仅有一小部分可归因于交通量下降。本文所使用的方法和测量结果凸显了大气CO观测的优势，即能及时洞察迅速变化的排放模式，从而使城市能够高效地对CO减排活动进行调整。
