| DOI: | 10.2172/1233295
|
| 报告号: | None
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| 报告题名: | Vertical microphysical profiles of convective clouds as a tool for obtaining aerosol cloud-mediated climate forcings |
| 作者: | Rosenfeld, Daniel
|
| 出版年: | 2015
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| 发表日期: | 2015-12-23
|
| 总页数: | 20
|
| 国家: | 美国
|
| 语种: | 英语
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| 英文关键词: | Cloud aerosol interactions
|
| 中文主题词: | 云凝结核
; 冷凝
; 云
; 凝结
|
| 主题词: | CLOUD CONDENSATION NUCLEI
; CONDENSATION
; CLOUDS
|
| 英文摘要: | Quantifying the aerosol/cloud-mediated radiative effect at a global scale requires simultaneous satellite retrievals of cloud condensation nuclei (CCN) concentrations and cloud base updraft velocities (Wb). Hitherto, the inability to do so has been a major cause of high uncertainty regarding anthropogenic aerosol/cloud-mediated radiative forcing. This can be addressed by the emerging capability of estimating CCN and Wb of boundary layer convective clouds from an operational polar orbiting weather satellite. Our methodology uses such clouds as an effective analog for CCN chambers. The cloud base supersaturation (S) is determined by Wb and the satellite-retrieved cloud base drop concentrations (Ndb), which is the same as CCN(S). Developing and validating this methodology was possible thanks to the ASR/ARM measurements of CCN and vertical updraft profiles. Validation against ground-based CCN instruments at the ARM sites in Oklahoma, Manaus, and onboard a ship in the northeast Pacific showed a retrieval accuracy of Âą25% to Âą30% for individual satellite overpasses. The methodology is presently limited to boundary layer not raining convective clouds of at least 1 km depth that are not obscured by upper layer clouds, including semitransparent cirrus. The limitation for small solar backscattering angles of <25Âş restricts the satellite coverage to ~25% of the world area in a single day. This methodology will likely allow overcoming the challenge of quantifying the aerosol indirect effect and facilitate a substantial reduction of the uncertainty in anthropogenic climate forcing. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1233295
|
| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/41668
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1233295.pdf（2115KB） | 研究报告 | -- | 开放获取 | | View
Download
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| Recommended Citation: | |
Rosenfeld, Daniel. Vertical microphysical profiles of convective clouds as a tool for obtaining aerosol cloud-mediated climate forcings. 2015-01-01.
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