期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 10, 页码 5318-5325出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL068837
关键词
-
资金
- National Aeronautics and Space Administration Climate Absolute Radiance and Refractivity Observatory (CLARREO) project at Langley Research Center
The radiative forcing (RF) of carbon dioxide (CO2) is the leading contribution to climate change from anthropogenic activities. Calculating CO2 RF requires detailed knowledge of spectral line parameters for thousands of infrared absorption lines. A reliable spectroscopic characterization of CO2 forcing is critical to scientific and policy assessments of present climate and climate change. Our results show that CO2 RF in a variety of atmospheres is remarkably insensitive to known uncertainties in the three main CO2 spectroscopic parameters: the line shapes, line strengths, and half widths. We specifically examine uncertainty in RF due to line mixing as this process is critical in determining line shapes in the far wings of CO2 absorption lines. RF computed with a Voigt line shape is also examined. Overall, the spectroscopic uncertainty in present-day CO2 RF is less than 1%, indicating a robust foundation in our understanding of how rising CO2 warms the climate system.
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