气候变化领域集成服务门户(CCPortal): Far-infrared surface emissivity and climate

CCPortal

DOI	10.1073/pnas.1413640111
	Far-infrared surface emissivity and climate
	Feldman D.R.; Collins W.D.; Pincus R.; Huang X.; Chen X.
发表日期	2014
ISSN	0027-8424
起始页码	16297
结束页码	162302
卷号	111 期号:46
英文摘要	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 highlatitude 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 clearsky 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. Additionally, 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.
英文关键词	Climate change; Emissivity; Polar amplification; Positive feedback; Remote sensing
语种	英语
scopus关键词	ice; altitude; arctic climate; Article; climate change; cooling; evaluation study; grain; infrared radiation; latitude; mineralogy; outgoing longwave radiation; physical parameters; positive feedback; radiative forcing; remote sensing; sea; surface emissivity; surface property; water vapor
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158986
作者单位	Feldman, D.R., Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Collins, W.D., Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States, Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States; Pincus, R., Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO 80309, United States; Huang, X., Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48109, United States; Chen, X., Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48109, United States
推荐引用方式 GB/T 7714	Feldman D.R.,Collins W.D.,Pincus R.,et al. Far-infrared surface emissivity and climate[J],2014,111(46).
APA	Feldman D.R.,Collins W.D.,Pincus R.,Huang X.,&Chen X..(2014).Far-infrared surface emissivity and climate.Proceedings of the National Academy of Sciences of the United States of America,111(46).
MLA	Feldman D.R.,et al."Far-infrared surface emissivity and climate".Proceedings of the National Academy of Sciences of the United States of America 111.46(2014).