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DOI | 10.5194/acp-17-595-2017 |
The G4Foam Experiment: global climate impacts of regional ocean albedo modification | |
Gabriel, Corey J.1; Robock, Alan1; Xia, Lili1; Zambri, Brian1; Kravitz, Ben2 | |
2017-01-12 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Reducing insolation has been proposed as a geo-engineering response to global warming. Here we present the results of climate model simulations of a unique Geo-engineering Model Intercomparison Project Testbed experiment to investigate the benefits and risks of a scheme that would brighten certain oceanic regions. The National Center for Atmospheric Research CESM CAM4-Chem global climate model was modified to simulate a scheme in which the albedo of the ocean surface is increased over the subtropical ocean gyres in the Southern Hemisphere. In theory, this could be accomplished using a stable, nondispersive foam, comprised of tiny, highly reflective microbubbles. Such a foam has been developed under idealized conditions, although deployment at a large scale is presently infeasible. We conducted three ensemble members of a simulation (G4Foam) from 2020 through to 2069 in which the albedo of the ocean surface is set to 0.15 (an increase of 150%) over the three subtropical ocean gyres in the Southern Hemisphere, against a background of the RCP6.0 (representative concentration pathway resulting in +6Wm (-2) radiative forcing by 2100) scenario. After 2069, geoengineering is ceased, and the simulation is run for an additional 20 years. Global mean surface temperature in G4Foam is 0.6K lower than RCP6.0, with statistically significant cooling relative to RCP6.0 south of 30 degrees N. There is an increase in rainfall over land, most pronouncedly in the tropics during the June-July-August season, relative to both G4SSA (specified stratospheric aerosols) and RCP6.0. Heavily populated and highly cultivated regions throughout the tropics, including the Sahel, southern Asia, the Maritime Continent, Central America, and much of the Amazon experience a statistically significant increase in precipitation minus evaporation. The temperature response to the relatively modest global average forcing of -1.5Wm (-2) is amplified through a series of positive cloud feedbacks, in which more shortwave radiation is reflected. The precipitation response is primarily the result of the intensification of the southern Hadley cell, as its mean position migrates northward and away from the Equator in response to the asymmetric cooling. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000393892400002 |
WOS关键词 | SST DIPOLE EVENTS ; MODEL ; PRECIPITATION ; CHEMISTRY ; VARIABILITY ; MONSOON ; TEMPERATURE ; PACIFIC ; AEROSOL ; COVER |
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/24938 |
专题 | 地球科学 |
作者单位 | 1.Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08901 USA; 2.Pacific Northwest Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Gabriel, Corey J.,Robock, Alan,Xia, Lili,et al. The G4Foam Experiment: global climate impacts of regional ocean albedo modification[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(1). |
APA | Gabriel, Corey J.,Robock, Alan,Xia, Lili,Zambri, Brian,&Kravitz, Ben.(2017).The G4Foam Experiment: global climate impacts of regional ocean albedo modification.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(1). |
MLA | Gabriel, Corey J.,et al."The G4Foam Experiment: global climate impacts of regional ocean albedo modification".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.1(2017). |
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