Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-2787-2018 |
Sulfur deposition changes under sulfate geoengineering conditions: quasi-biennial oscillation effects on the transport and lifetime of stratospheric aerosols | |
Visioni, Daniele1,2; Pitari, Giovanni1; Tuccella, Paolo1,2; Curci, Gabriele1,2 | |
2018-02-27 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:4页码:2787-2808 |
文章类型 | Article |
语种 | 英语 |
国家 | Italy |
英文摘要 | Sustained injection of sulfur dioxide (SO2) in the tropical lower stratosphere has been proposed as a climate engineering technique for the coming decades. Among several possible environmental side effects, the increase in sulfur deposition deserves additional investigation. In this study we present results from a composition-climate coupled model (University of L'Aquila Composition-Chemistry Model, ULAQ-CCM) and a chemistry-transport model (Goddard Earth Observing System Chemistry-Transport Model, GEOS-Chem), assuming a sustained lower-stratospheric equatorial injection of 8 Tg SO2 yr(-1). Total S deposition is found to globally increase by 5.2% when sulfate geoengineering is deployed, with a clear interhemispheric asymmetry (+3.8 and +10.3% in the Northern Hemisphere (NH) and the Southern Hemisphere (SH), due to +2.2 and +1.8 Tg S yr(-1), respectively). The two models show good consistency, both globally and on a regional scale under background and geoengineering conditions, except for S-deposition changes over Africa and the Arctic. The consistency exists with regard to time-averaged values but also with regard to monthly and interannual deposition changes. The latter is driven essentially by the variability in stratospheric large-scale transport associated with the quasi-biennial oscillation (QBO). Using an externally nudged QBO, it is shown how a zonal wind E shear favors aerosol confinement in the tropical pipe and a significant increase in their effective radius (+13% with respect to W shear conditions). The net result is an increase in the downward cross-tropopause S flux over the tropics with dominant E shear conditions with respect to W shear periods (+0.61 Tg S yr(-1), +42 %, mostly due to enhanced aerosol gravitational settling) and a decrease over the extratropics (-0.86 Tg S yr(-1), -35 %, mostly due to decreased large-scale stratosphere-troposphere exchange of geoengineering sulfate). This translates into S-deposition changes that are significantly different under opposite QBO wind shears, with an E-W anomaly of +0.32 in the tropics and -0.67 Tg S yr(-1) in the extratropics. Most online QBO schemes predict a significant change in the zonal wind periodicity, up to a blocked E shear condition for large enough injections, so that our results indicate an upper limit for the tropical increase in S deposition of 16.5% relative to average conditions of unperturbed QBO periodicity and a correspondent extratropical S deposition decrease of 16 %. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426244400003 |
WOS关键词 | DRY DEPOSITION ; MOUNT-PINATUBO ; MODEL ; CLIMATE ; CHEMISTRY ; OZONE ; SIMULATION ; ERUPTION ; IMPACTS ; PERTURBATION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29468 |
专题 | 地球科学 |
作者单位 | 1.Univ Aquila, Dept Phys & Chem Sci, I-67100 Laquila, Italy; 2.Univ Aquila, CETEMPS, I-67100 Laquila, Italy |
推荐引用方式 GB/T 7714 | Visioni, Daniele,Pitari, Giovanni,Tuccella, Paolo,et al. Sulfur deposition changes under sulfate geoengineering conditions: quasi-biennial oscillation effects on the transport and lifetime of stratospheric aerosols[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(4):2787-2808. |
APA | Visioni, Daniele,Pitari, Giovanni,Tuccella, Paolo,&Curci, Gabriele.(2018).Sulfur deposition changes under sulfate geoengineering conditions: quasi-biennial oscillation effects on the transport and lifetime of stratospheric aerosols.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(4),2787-2808. |
MLA | Visioni, Daniele,et al."Sulfur deposition changes under sulfate geoengineering conditions: quasi-biennial oscillation effects on the transport and lifetime of stratospheric aerosols".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.4(2018):2787-2808. |
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