Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of the nitrogen oxide emission inventory with TROPOMI observations
https://orcid.org/0000-0001-7997-8578
https://orcid.org/0000-0003-1725-4405
https://orcid.org/0000-0001-7010-6124
Abstract To compensate for the emissions missed or underestimated in the national bottom-up emission inventories, we apply the high spatial resolution satellite data from TROPOspheric Monitoring Instrument (TROPOMI) to estimate the top-down nitrogen oxide (NOx) emissions in regional scales. The NOx chemical lifetime is derived based on ground-based measurements of ozone photolysis rate, ultra-violet (UV) index, and temperature. For five designated regions of western Taiwan, the derived lifetime is about 1–2 h in summer and 2–4 h in winter. The retrieved 2021 annual emissions for regions near two major pollution sources, Taichung thermal power plant and Mailiao Industrial Zone, are comparable with the emission from the Continuous Emission Monitoring System (CEMS), with a difference of 6% and −12%, respectively. After validating the data and methods, the NOx emissions for five regions of western Taiwan are derived and applied to evaluate the bottom-up inventories. For northern and southern Taiwan, the top-down emissions agree well with emission inventories. The top-down emissions are 12%, 23%, and 16% higher than emission inventories for north-central, central, and south-central Taiwan, respectively. This indicates that the bottom-up inventories are underestimated from north-central to south-central Taiwan, which may be associated with the uncertainties from traffic sources. Given the various complex pollution sources, deriving NOx emissions from space allows us to acquire a better understanding of emissions on urban scales and improve the bottom-up emission inventories.
Highlights The NOx chemical lifetime is derived using ground-based measurements. The top-down emissions of major pollution sources are comparable with emissions from the monitoring system. The bottom-up inventories are underestimated in certain cities. The data with derived lifetime and methods allow us to monitor the NOx emissions in megacities.
Evaluation of the nitrogen oxide emission inventory with TROPOMI observations
https://orcid.org/0000-0001-7997-8578
https://orcid.org/0000-0003-1725-4405
https://orcid.org/0000-0001-7010-6124
Abstract To compensate for the emissions missed or underestimated in the national bottom-up emission inventories, we apply the high spatial resolution satellite data from TROPOspheric Monitoring Instrument (TROPOMI) to estimate the top-down nitrogen oxide (NOx) emissions in regional scales. The NOx chemical lifetime is derived based on ground-based measurements of ozone photolysis rate, ultra-violet (UV) index, and temperature. For five designated regions of western Taiwan, the derived lifetime is about 1–2 h in summer and 2–4 h in winter. The retrieved 2021 annual emissions for regions near two major pollution sources, Taichung thermal power plant and Mailiao Industrial Zone, are comparable with the emission from the Continuous Emission Monitoring System (CEMS), with a difference of 6% and −12%, respectively. After validating the data and methods, the NOx emissions for five regions of western Taiwan are derived and applied to evaluate the bottom-up inventories. For northern and southern Taiwan, the top-down emissions agree well with emission inventories. The top-down emissions are 12%, 23%, and 16% higher than emission inventories for north-central, central, and south-central Taiwan, respectively. This indicates that the bottom-up inventories are underestimated from north-central to south-central Taiwan, which may be associated with the uncertainties from traffic sources. Given the various complex pollution sources, deriving NOx emissions from space allows us to acquire a better understanding of emissions on urban scales and improve the bottom-up emission inventories.
Highlights The NOx chemical lifetime is derived using ground-based measurements. The top-down emissions of major pollution sources are comparable with emissions from the monitoring system. The bottom-up inventories are underestimated in certain cities. The data with derived lifetime and methods allow us to monitor the NOx emissions in megacities.
Evaluation of the nitrogen oxide emission inventory with TROPOMI observations
https://orcid.org/0000-0001-7997-8578
https://orcid.org/0000-0003-1725-4405
https://orcid.org/0000-0001-7010-6124
Abstract To compensate for the emissions missed or underestimated in the national bottom-up emission inventories, we apply the high spatial resolution satellite data from TROPOspheric Monitoring Instrument (TROPOMI) to estimate the top-down nitrogen oxide (NOx) emissions in regional scales. The NOx chemical lifetime is derived based on ground-based measurements of ozone photolysis rate, ultra-violet (UV) index, and temperature. For five designated regions of western Taiwan, the derived lifetime is about 1–2 h in summer and 2–4 h in winter. The retrieved 2021 annual emissions for regions near two major pollution sources, Taichung thermal power plant and Mailiao Industrial Zone, are comparable with the emission from the Continuous Emission Monitoring System (CEMS), with a difference of 6% and −12%, respectively. After validating the data and methods, the NOx emissions for five regions of western Taiwan are derived and applied to evaluate the bottom-up inventories. For northern and southern Taiwan, the top-down emissions agree well with emission inventories. The top-down emissions are 12%, 23%, and 16% higher than emission inventories for north-central, central, and south-central Taiwan, respectively. This indicates that the bottom-up inventories are underestimated from north-central to south-central Taiwan, which may be associated with the uncertainties from traffic sources. Given the various complex pollution sources, deriving NOx emissions from space allows us to acquire a better understanding of emissions on urban scales and improve the bottom-up emission inventories.
Highlights The NOx chemical lifetime is derived using ground-based measurements. The top-down emissions of major pollution sources are comparable with emissions from the monitoring system. The bottom-up inventories are underestimated in certain cities. The data with derived lifetime and methods allow us to monitor the NOx emissions in megacities.
Evaluation of the nitrogen oxide emission inventory with TROPOMI observations
Chen, Yi-Chun (Autor:in) / Chou, Charles C.-K. (Autor:in) / Liu, Chian-Yi (Autor:in) / Chi, Szu-Yu (Autor:in) / Chuang, Ming-Tung (Autor:in)
Atmospheric Environment ; 298
02.02.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| DOAJ | 2021
| Elsevier | 2024