| DOI: | 10.1007/s00382-011-1256-1
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| Scopus记录号: | 2-s2.0-84866356860
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| 论文题名: | Albedo enhancement over land to counteract global warming: Impacts on hydrological cycle |
| 作者: | Bala G.; Nag B.
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| 刊名: | Climate Dynamics
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| ISSN: | 9307575
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| 出版年: | 2012
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| 卷: | 39, 期:6 | | 起始页码: | 1527
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| 结束页码: | 1542
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| 语种: | 英语
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| 英文摘要: | A recent modelling study has shown that precipitation and runoff over land would increase when the reflectivity of marine clouds is increased to counter global warming. This implies that large scale albedo enhancement over land could lead to a decrease in runoff over land. In this study, we perform simulations using NCAR CAM3. 1 that have implications for Solar Radiation Management geoengineering schemes that increase the albedo over land. We find that an increase in reflectivity over land that mitigates the global mean warming from a doubling of CO2 leads to a large residual warming in the southern hemisphere and cooling in the northern hemisphere since most of the land is located in northern hemisphere. Precipitation and runoff over land decrease by 13. 4 and 22. 3%, respectively, because of a large residual sinking motion over land triggered by albedo enhancement over land. Soil water content also declines when albedo over land is enhanced. The simulated magnitude of hydrological changes over land are much larger when compared to changes over oceans in the recent marine cloud albedo enhancement study since the radiative forcing over land needed (-8. 2 W m-2) to counter global mean radiative forcing from a doubling of CO2 (3. 3 W m-2) is approximately twice the forcing needed over the oceans (-4. 2 W m-2). Our results imply that albedo enhancement over oceans produce climates closer to the unperturbed climate state than do albedo changes on land when the consequences on land hydrology are considered. Our study also has important implications for any intentional or unintentional large scale changes in land surface albedo such as deforestation/afforestation/reforestation, air pollution, and desert and urban albedo modification. © 2011 Springer-Verlag. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/55179
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Divecha Center for Climate Change and Center for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore 560012, India
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| Recommended Citation: | |
Bala G.,Nag B.. Albedo enhancement over land to counteract global warming: Impacts on hydrological cycle[J]. Climate Dynamics,2012-01-01,39(6)
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