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Impact of COVID-19-related Air Traffic Reductions on the Coverage and Radiative Effects of Linear Persistent Contrails over Conterminous United States and Surrounding Oceanic Routes.
| 题名： | Impact of COVID-19-related Air Traffic Reductions on the Coverage and Radiative Effects of Linear Persistent Contrails over Conterminous United States and Surrounding Oceanic Routes. |
| 作者： | Duda, D. P; Jr, W. L. S; Bedka, S; Spangenberg, D. A; Chee, T; Minnis, P. |
| 摘要： | The radiative effects of the large-scale air traffic slowdown during Apr and May 2020 due to the 20 international response to the COVID-19 pandemic are estimated by comparing the coverage 21 (CC), optical properties, and radiative forcing of persistent linear contrails over the conterminous 22 United States and two surrounding oceanic air corridors during the slowdown period and a 23 similar baseline period during 2018 and 2019 when air traffic was unrestricted. The detected CC 24 during the slowdown period decreased by an area-averaged mean of 41% for the three analysis 25 boxes. The retrieved contrail optical properties were mostly similar for both periods. Total 26 shortwave contrail radiative forcings during the slowdown were 34 and 42% smaller for Terra 27 and Aqua, respectively. The corresponding differences for longwave contrail radiative forcing 28 were 33% for Terra and 40% for Aqua. To account for the impact of any changes in the 29 atmospheric environment between baseline and slowdown periods on detected CC amounts, the 30 contrail formation potential (CFP) was computed from reanalysis data. In addition, a filtered 31 CFP (fCFP) was also developed to account for factors that may affect contrail formation and 32 visibility of persistent contrails in satellite imagery. The CFP and fCFP were combined with air 33 traffic data to create empirical models that estimated CC during the baseline and slowdown 34 periods and were compared to the detected CC. The models confirm that decreases in CC and 35 radiative forcing during the slowdown period were mostly due to the reduction in air traffic, and 36 partly due to environmental changes. |
| 总页数： | 74 pages |
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