气候变化领域集成服务门户(CCPortal): Future Decreases in Thermospheric Neutral Density in Low Earth Orbit due to Carbon Dioxide Emissions

CCPortal

DOI	10.1029/2021JD034589
	Future Decreases in Thermospheric Neutral Density in Low Earth Orbit due to Carbon Dioxide Emissions
	Brown M.K.; Lewis H.G.; Kavanagh A.J.; Cnossen I.
发表日期	2021
ISSN	2169897X
卷号	126 期号:8
英文摘要	Increasing carbon dioxide causes cooling in the upper atmosphere and a secular decrease in atmospheric density over time. With the use of the Whole Atmospheric Community Climate Model with thermosphere and ionosphere extension (WACCM-X), neutral thermospheric densities up to 500 km have been modeled under increasing carbon dioxide concentrations. Only carbon dioxide and carbon monoxide concentrations are changed between simulations, and solar activity is held low at F10.7 = 70 throughout. Neutral density decreases through to the year 2100 have been modeled using four carbon dioxide emission scenarios produced by the Intergovernmental Panel on Climate Change (IPCC). The years 1975 and 2005 have also been simulated, which indicated a historic trend of −5.8% change in neutral density per decade. Decreases in the neutral density relative to the year 2000 have been given for increasing ground-level carbon dioxide concentrations. WACCM-X shows there has already been a 17% decrease in neutral densities at 400 km relative to the density in the year 2000. This becomes a 30% reduction at the 50:50 probability threshold of limiting warming to 1.5°C, as set out in the Paris Agreement. A simple orbital propagator has been used to show the impact the decrease in density has on the orbital lifetime of objects traveling through the thermosphere. If the 1.5°C target is met, objects in Low Earth Orbit (LEO) will have orbital lifetimes around 30% longer than comparable objects from the year 2000. © 2021. The Authors.
英文关键词	space debris; thermosphere; WACCM-X
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185316
作者单位	University of Southampton, Aeronautical and Astronautical Engineering, Faculty of Engineering and Physical Sciences, Boldrewood Innovation Campus, Southampton, United Kingdom; British Antarctic Survey, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Brown M.K.,Lewis H.G.,Kavanagh A.J.,et al. Future Decreases in Thermospheric Neutral Density in Low Earth Orbit due to Carbon Dioxide Emissions[J],2021,126(8).
APA	Brown M.K.,Lewis H.G.,Kavanagh A.J.,&Cnossen I..(2021).Future Decreases in Thermospheric Neutral Density in Low Earth Orbit due to Carbon Dioxide Emissions.Journal of Geophysical Research: Atmospheres,126(8).
MLA	Brown M.K.,et al."Future Decreases in Thermospheric Neutral Density in Low Earth Orbit due to Carbon Dioxide Emissions".Journal of Geophysical Research: Atmospheres 126.8(2021).