Far-infrared surface emissivity and climate
Abstract
Presently, there are no global measurement constraints on the surface emissivity at wavelengths longer than 15 μm, even though this surface property in this far-IR region has a direct impact on the outgoing longwave radiation (OLR) and infrared cooling rates where the column precipitable water vapor (PWV) is less than 1 mm. Such dry conditions are common for high-altitude and high-latitude locations, with the potential for modeled climate to be impacted by uncertain surface characteristics. This paper explores the sensitivity of instantaneous OLR and cooling rates to changes in far-IR surface emissivity and how this unconstrained property impacts climate model projections. At high latitudes and altitudes, a 0.05 change in emissivity due to mineralogy and snow grain size can cause a 1.8–2.0 W m⁻² difference in the instantaneous clear-sky OLR. A variety of radiative transfer techniques have been used to model the far-IR spectral emissivities of surface types defined by the International Geosphere-Biosphere Program. Incorporating these far-IR surface emissivities into the Representative Concentration Pathway (RCP) 8.5 scenario of the Community Earth System Model leads to discernible changes in the spatial patterns of surface temperature, OLR, and frozen surface extent. The model results differ at high latitudes by as much asmore »
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Univ. of Colorado, Boulder, CO (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1221842
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Volume: 111; Journal Issue: 46; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; climate change; positive feedback; emissivity; remote sensing; polar amplification
Citation Formats
Feldman, Daniel R., Collins, William D., Pincus, Robert, Huang, Xianglei, and Chen, Xiuhong. Far-infrared surface emissivity and climate. United States: N. p., 2014.
Web. doi:10.1073/pnas.1413640111.
Feldman, Daniel R., Collins, William D., Pincus, Robert, Huang, Xianglei, & Chen, Xiuhong. Far-infrared surface emissivity and climate. United States. https://doi.org/10.1073/pnas.1413640111
Feldman, Daniel R., Collins, William D., Pincus, Robert, Huang, Xianglei, and Chen, Xiuhong. Mon .
"Far-infrared surface emissivity and climate". United States. https://doi.org/10.1073/pnas.1413640111. https://www.osti.gov/servlets/purl/1221842.
@article{osti_1221842,
title = {Far-infrared surface emissivity and climate},
author = {Feldman, Daniel R. and Collins, William D. and Pincus, Robert and Huang, Xianglei and Chen, Xiuhong},
abstractNote = {Presently, there are no global measurement constraints on the surface emissivity at wavelengths longer than 15 μm, even though this surface property in this far-IR region has a direct impact on the outgoing longwave radiation (OLR) and infrared cooling rates where the column precipitable water vapor (PWV) is less than 1 mm. Such dry conditions are common for high-altitude and high-latitude locations, with the potential for modeled climate to be impacted by uncertain surface characteristics. This paper explores the sensitivity of instantaneous OLR and cooling rates to changes in far-IR surface emissivity and how this unconstrained property impacts climate model projections. At high latitudes and altitudes, a 0.05 change in emissivity due to mineralogy and snow grain size can cause a 1.8–2.0 W m⁻² difference in the instantaneous clear-sky OLR. A variety of radiative transfer techniques have been used to model the far-IR spectral emissivities of surface types defined by the International Geosphere-Biosphere Program. Incorporating these far-IR surface emissivities into the Representative Concentration Pathway (RCP) 8.5 scenario of the Community Earth System Model leads to discernible changes in the spatial patterns of surface temperature, OLR, and frozen surface extent. The model results differ at high latitudes by as much as 2°K, 10 W m⁻², and 15%, respectively, after only 25 y of integration. The calculated difference in far-IR emissivity between ocean and sea ice of between 0.1 and 0.2, suggests the potential for a far-IR positive feedback for polar climate change.},
doi = {10.1073/pnas.1413640111},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 46,
volume = 111,
place = {United States},
year = {Mon Nov 03 00:00:00 EST 2014},
month = {Mon Nov 03 00:00:00 EST 2014}
}
Web of Science
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