| DOI: | 10.5194/cp-10-1779-2014
|
| Scopus记录号: | 2-s2.0-84908029949
|
| 论文题名: | Radiative forcings for 28 potential Archean greenhouse gases |
| 作者: | Byrne B.; Goldblatt C.
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| 刊名: | Climate of the Past
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| ISSN: | 18149324
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| 出版年: | 2014
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| 卷: | 10, 期:5 | | 起始页码: | 1779
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| 结束页码: | 1801
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| 语种: | 英语
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| Scopus关键词: | Archean
; carbon dioxide
; climate variation
; greenhouse gas
; methane
; paleoatmosphere
; paleoclimate
; radiative forcing
; source-sink dynamics
|
| 英文摘要: | Despite reduced insolation in the late Archean, evidence suggests a∼warm climate which was likely sustained by a stronger greenhouse effect, the so-called faint young sun problem (FYSP). CO2 and CH4 ARE generally thought to be the mainstays of this enhanced greenhouse, though many other gases have been proposed. We present high accuracy radiative forcings for CO2, CH4, and 26 other gases, performing the radiative transfer calculations at line-by-line resolution and using HITRAN 2012 line data for background pressures of 0.5, 1, and 2 bar of atmospheric N2. For CO2 to resolve the FYSP alone at 2.8 Gyr BP (80% of present solar luminosity), 0.32 bar is needed with 0.5 bar of atmospheric N2, 0.20 bar with 1 bar of atmospheric N2, or 0.11 bar with 2 bar of atmospheric N2. For CH4, we find that near-infrared absorption is much stronger than previously thought, arising from updates to the HITRAN database. CH4 radiative forcing peaks at 10.3, 9, or 8.3 W m-2 for background pressures of 0.5, 1, or 2 bar, likely limiting the utility of CH4 for warming the Archean. For the other 26 HITRAN gases, radiative forcings of up to a few to 10 W m-2 are obtained from concentrations of 0.1-1 ppmv for many gases. For the 20 strongest gases, we calculate the reduction in radiative forcing due to overlap. We also tabulate the modern sources, sinks, concentrations, and lifetimes of these gases and summaries the literature on Archean sources and concentrations. We recommend the forcings provided here be used both as a first reference for which gases are likely good greenhouse gases, and as a standard set of calculations for validation of radiative forcing calculations for the Archean. © 2014 Author(s). |
| 资助项目: | NSERC, Natural Sciences and Engineering Research Council of Canada
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| Citation statistics: |
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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/49219
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| Appears in Collections: | 气候变化与战略
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| Recommended Citation: | |
Byrne B.,Goldblatt C.. Radiative forcings for 28 potential Archean greenhouse gases[J]. Climate of the Past,2014-01-01,10(5)
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