气候变化领域集成服务门户(CCPortal): An approach to sulfate geoengineering with surface emissions of carbonyl sulfide

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DOI	10.5194/acp-22-5757-2022
	An approach to sulfate geoengineering with surface emissions of carbonyl sulfide
	Quaglia, Ilaria; Visioni, Daniele; Pitari, Giovanni; Ben Kravitz
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	5757
结束页码	5773
卷号	22 期号:9 页码:17
英文摘要	Sulfate geoengineering (SG) methods based on lower stratospheric tropical injection of sulfur dioxide (SO2) have been widely discussed in recent years, focusing on the direct and indirect effects they would have on the climate system. Here a potential alternative method is discussed, where sulfur emissions are located at the surface or in the troposphere in the form of carbonyl sulfide (COS) gas. There are two time-dependent chemistry-climate model experiments designed from the years 2021 to 2055, assuming a 40 Tg - S yr(-1) artificial global flux of COS, which is geographically distributed following the present-day anthropogenic COS surface emissions (SG-COS-SRF) or a 6 Tg - S yr(-1) injection of COS in the tropical upper troposphere (SG-COS-TTL). The budget of COS and sulfur species is discussed, as are the effects of both SG-COS strategies on the stratospheric sulfate aerosol optical depth (similar to Delta tau = 0.080 in the years 2046-2055), aerosol effective radius (0.46 mu m), surface SOx deposition (+8.9 % for SG-COS -SRF; +3.3 % for SG-COS-TTL), and tropopause radiative forcing (RF; similar to -1.5 Wm(-2) in all-sky conditions in both SG-COS experiments). Indirect effects on ozone, methane and stratospheric water vapour are also considered, along with the COS direct contribution. According to our model results, the resulting net RF is -1.3 Wm(-2), for SG-COS-SRF, and -1.5 Wm(-2), for SG-COS-TTL, and it is comparable to the corresponding RF of -1.7 WM-2 obtained with a sustained injection of 4 Tg - Syr(-1) in the tropical lower stratosphere in the form of SO2 (SG-SO2, which is able to produce a comparable increase of the sulfate aerosol optical depth). Significant changes in the stratospheric ozone response are found in both SG-COS experiments with respect to SG-SO2 (similar to 5 DU versus +1.4 DU globally). According to the model results, the resulting ultraviolet B (UVB) perturbation at the surface accounts for -4.3 % as a global and annual average (versus -2.4 % in the SG-SO2 case), with a springtime Antarctic decrease of -2.7 % (versus a +5.8 % increase in the SG-SO2 experiment). Overall, we find that an increase in COS emissions may be feasible and produce a more latitudinally uniform forcing without the need for the deployment of stratospheric aircraft. However, our assumption that the rate of COS uptake by soils and plants does not vary with increasing COS concentrations will need to be investigated in future work, and more studies are needed on the prolonged exposure effects to higher COS values in humans and ecosystems.
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:000789846900001
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/273204
作者单位	University of L'Aquila; Cornell University; Indiana University System; Indiana University Bloomington; United States Department of Energy (DOE); Pacific Northwest National Laboratory
推荐引用方式 GB/T 7714	Quaglia, Ilaria,Visioni, Daniele,Pitari, Giovanni,et al. An approach to sulfate geoengineering with surface emissions of carbonyl sulfide[J],2022,22(9):17.
APA	Quaglia, Ilaria,Visioni, Daniele,Pitari, Giovanni,&Ben Kravitz.(2022).An approach to sulfate geoengineering with surface emissions of carbonyl sulfide.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(9),17.
MLA	Quaglia, Ilaria,et al."An approach to sulfate geoengineering with surface emissions of carbonyl sulfide".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.9(2022):17.