Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0347.1 |
Simple Spectral Models for Atmospheric Radiative Cooling | |
Jeevanjee, Nadir1,2; Fueglistaler, Stephan1 | |
2020-02-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
![]() |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:2页码:479-497 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Atmospheric radiative cooling is a fundamental aspect of Earth's greenhouse effect, and is intrinsically connected to atmospheric motions. At the same time, basic aspects of longwave radiative cooling, such as its characteristic value of 2 K day(-1), its sharp decline (or "kink") in the upper troposphere, and the large values of CO2 cooling in the stratosphere, are difficult to understand intuitively or estimate with pencil and paper. Here we pursue such understanding by building simple spectral (rather than gray) models for clear-sky radiative cooling. We construct these models by combining the cooling-to-space approximation with simplified greenhouse gas spectroscopy and analytical expressions for optical depth, and we validate these simple models with line-by-line calculations. We find that cooling rates can be expressed as a product of the Planck function, a vertical emissivity gradient, and a characteristic spectral width derived from our simplified spectroscopy. This expression allows for a pencil-and-paper estimate of the 2 K day(-1) tropospheric cooling rate, as well as an explanation of enhanced CO2 cooling rates in the stratosphere. We also link the upper-tropospheric kink in radiative cooling to the distribution of H2O absorption coefficients, and from this derive an analytical expression for the kink temperature T-kink approximate to 220 K. A further, ancillary result is that gray models fail to reproduce basic features of atmospheric radiative cooling. |
英文关键词 | Radiation budgets Radiative fluxes Radiative transfer |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000508570000002 |
WOS关键词 | CO2 15-MU-M BAND ; CLOUD OBJECTS ; ANVIL CLOUDS ; TEMPERATURE ; TROPOPAUSE ; CONSTRAINT ; RATES ; CERES |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280273 |
专题 | 地球科学 |
作者单位 | 1.Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA; 2.Princeton Univ, Program Atmosphere & Ocean Sci, Princeton, NJ 08544 USA |
推荐引用方式 GB/T 7714 | Jeevanjee, Nadir,Fueglistaler, Stephan. Simple Spectral Models for Atmospheric Radiative Cooling[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(2):479-497. |
APA | Jeevanjee, Nadir,&Fueglistaler, Stephan.(2020).Simple Spectral Models for Atmospheric Radiative Cooling.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(2),479-497. |
MLA | Jeevanjee, Nadir,et al."Simple Spectral Models for Atmospheric Radiative Cooling".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.2(2020):479-497. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论