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- W4386031317 abstract "Abstract. Hydrogen-powered hypersonic aircraft are designed to travel in the middle stratosphere at approximately 30–40 km. These aircraft can have a considerable impact on climate-relevant species like stratospheric water vapour, ozone and methane and thus would contribute to climate warming. The impact of hypersonic aircraft emissions on atmospheric composition and in turn on radiation fluxes differs strongly depending on cruise altitude. However, in contrast to variation of altitude of emission, differences from variation of latitude of emission are currently unknown. Here we show that a variation in latitude of emission can have a larger effect on perturbations and stratospheric-adjusted radiative forcing than a variation of altitude of emission. Our results include individual impacts on middle atmospheric water vapour, ozone and methane, of water vapour and nitrogen oxide emissions, as well as unburnt hydrogen and the resulting radiative forcing. Water vapour perturbation lifetime continues the known tropospheric increase with altitude and reaches almost six years in the middle stratosphere. Our results demonstrate how atmospheric composition changes caused by emissions of hypersonic aircraft are controlled by large-scale processes like the Brewer-Dobson circulation and, depending on latitude of emission, local phenomena like polar stratospheric clouds. The analysis includes a model evaluation of ozone and water vapour with satellite data and a novel approach to reduce simulated years by one-third and thus cost and climate impact. A prospect is the analysis of seasonal sensitivities and simulations with emissions from combustion of liquefied natural gas instead of liquid hydrogen." @default.
- W4386031317 created "2023-08-22" @default.
- W4386031317 creator A5007597665 @default.
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- W4386031317 date "2023-08-21" @default.
- W4386031317 modified "2023-10-09" @default.
- W4386031317 title "Sensitivities of atmospheric composition and climate to altitude and latitude of hypersonic aircraft emissions" @default.
- W4386031317 doi "https://doi.org/10.5194/egusphere-2023-1777" @default.
- W4386031317 hasPublicationYear "2023" @default.
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