The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018

TLDR: CO2-warming-equivalent emissions based on global warming potentials (GWP* method) indicate that aviation emissions are currently warming the climate at approximately three times the rate of that associated with aviation CO2 emissions alone.

About: This article is published in Atmospheric Environment.The article was published on 2021-01-01 and is currently open access. It has received 437 citations till now. The article focuses on the topics: Environmental impact of aviation & Global warming.

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Table D.1. The CH4 RFs derived for all the aircraft emission 1812 inventories that are present in the model ensemble.a 1813

Figure 4. Results from an ensemble of 18 models from 20 studies for aviation NOx impacts: short-term O3 1358 increases; CH4 reductions, CH4-induced long-term reductions of O3, CH4-induced reductions of 1359 stratospheric water vapor (SWV) and Net NOx. Each data point represents a value of RF per unit emission 1360 (mW m-2 (Tg N yr-1)-1) as normalized from a published study (see SD). CH4-induced O3 and SWV are 1361 calculated using standardized methodology (see text for details). Note that the displayed values do not 1362 include correction factors to account for the non-steady-state CH4 responses to NOx emissions and the new 1363 CH4 RF parameterization. These adjustments are applied in forming the best estimates as discussed in 1364 Appendix D. 1365

Table 4b. Basis for confidence levels in Table 4aa 1304

Table D.3. Methane response in TROPOS and other studies 1824

Figure D.2. (a) Past and future anthropogenic emissions of CO, CH4, NOx, NMVOC, N2O and aircraft 1856 NOx (IIASA RCP Database: http://www.iiasa.ac.at/web-apps/tnt/RcpDb/). Dots represent conditions for 1857 ‘constant 2000’ and ‘constant 2050’ simulations. 1858

Figure D.1 . Matrix of pair-wise scatter plots of RF values from NOx terms: short-term O3, CH4, CH4-1850 induced O3, SWV and net NOx (i.e., the sum of all 4 components), all represented as normalized RFs 1851 (mW m-2 (Tg(N)yr-1)-1) from the ensemble studies (see details in text). The red line is the linear fit, the 1852 ellipse shows the 95% confidence level and histograms present frequencies. 1853