气候变化领域集成服务门户(CCPortal): Transport patterns of global aviation NOx and their short-term O-3 radiative forcing

CCPortal

DOI	10.5194/acp-22-14253-2022
	Transport patterns of global aviation NOx and their short-term O-3 radiative forcing - a machine learning approach
	Maruhashi, Jin; Grewe, Volker; Froemming, Christine; Joeckel, Patrick; Dedoussi, Irene C.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	14253
结束页码	14282
卷号	22 期号:21 页码:30
英文摘要	Aviation produces a net climate warming contribution that comprises multiple forcing terms of mixed sign. Aircraft NOx emissions are associated with both warming and cooling terms, with the short-term increase in O-3 induced by NOx emissions being the dominant warming effect. The uncertainty associated with the magnitude of this climate forcer is amongst the highest out of all contributors from aviation and is owed to the nonlinearity of the NOx-O-3 chemistry and the large dependency of the response on space and time, i.e., on the meteorological condition and background atmospheric composition. This study addresses how transport patterns of emitted NOx and their climate effects vary with respect to regions (North America, South America, Africa, Eurasia and Australasia) and seasons (January-March and July-September in 2014) by employing global-scale simulations. We quantify the climate effects from NOx emissions released at a representative aircraft cruise altitude of 250 hPa (similar to 10 400 m) in terms of radiative forcing resulting from their induced short-term contributions to O-3. The emitted NOx is transported with Lagrangian air parcels within the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model. To identify the main global transport patterns and associated climate impacts of the 14 000 simulated air parcel trajectories, the unsupervised QuickBundles clustering algorithm is adapted and applied. Results reveal a strong seasonal dependence of the contribution of NOx emissions to O-3. For most regions, an inverse relationship is found between an air parcel's downward transport and its mean contribution to O-3. NOx emitted in the northern regions (North America and Eurasia) experience the longest residence times in the upper midlatitudes (40 %-45 % of their lifetime), while those beginning in the south (South America, Africa and Australasia) remain mostly in the Tropics (45 %-50 % of their lifetime). Due to elevated O-3 sensitivities, emissions in Australasia induce the highest overall radiative forcing, attaining values that are larger by factors of 2.7 and 1.2 relative to Eurasia during January and July, respectively. The location of the emissions does not necessarily correspond to the region that will be most affected - for instance, NOx over North America in July will induce the largest radiative forcing in Europe. Overall, this study highlights the spatially and temporally heterogeneous nature of the NOx-O-3 chemistry from a global perspective, which needs to be accounted for in efforts to minimize aviation's climate impact, given the sector's resilient growth.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000879750500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272983
作者单位	Delft University of Technology; Helmholtz Association; German Aerospace Centre (DLR)
推荐引用方式 GB/T 7714	Maruhashi, Jin,Grewe, Volker,Froemming, Christine,et al. Transport patterns of global aviation NOx and their short-term O-3 radiative forcing - a machine learning approach[J],2022,22(21):30.
APA	Maruhashi, Jin,Grewe, Volker,Froemming, Christine,Joeckel, Patrick,&Dedoussi, Irene C..(2022).Transport patterns of global aviation NOx and their short-term O-3 radiative forcing - a machine learning approach.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(21),30.
MLA	Maruhashi, Jin,et al."Transport patterns of global aviation NOx and their short-term O-3 radiative forcing - a machine learning approach".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.21(2022):30.