Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0352.1 |
On the Cooling-to-Space Approximation | |
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:465-478 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The cooling-to-space (CTS) approximation says that the radiative cooling of an atmospheric layer is dominated by that layer's emission to space, while radiative exchange with layers above and below largely cancel. Though the CTS approximation has been demonstrated empirically and is thus fairly well accepted, a theoretical justification is lacking. Furthermore, the intuition behind the CTS approximation cannot be universally valid, as the CTS approximation fails in the case of pure radiative equilibrium. Motivated by this, we investigate the CTS approximation in detail. We frame the CTS approximation in terms of a novel decomposition of radiative flux divergence, which better captures the cancellation of exchange terms. We also derive validity criteria for the CTS approximation, using simple analytical theory. We apply these criteria in the context of both gray gas pure radiative equilibrium (PRE) and radiative-convective equilibrium (RCE) to understand how the CTS approximation arises and why it fails in PRE. When applied to realistic gases in RCE, these criteria predict that the CTS approximation should hold well for H2O but less so for CO2, a conclusion we verify with line-by-line radiative transfer calculations. Along the way we also discuss the well-known "tau = 1 law," and its dependence on the choice of vertical coordinate. |
英文关键词 | Radiative fluxes Radiative forcing Radiative transfer |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000508570000001 |
WOS关键词 | CO2 15-MU-M BAND ; ATMOSPHERIC FLUXES ; RADIATIVE-TRANSFER ; STATIC STABILITY ; RATES ; MODEL ; TEMPERATURE ; COMPUTATION ; GCM |
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/280272 |
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. On the Cooling-to-Space Approximation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(2):465-478. |
APA | Jeevanjee, Nadir,&Fueglistaler, Stephan.(2020).On the Cooling-to-Space Approximation.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(2),465-478. |
MLA | Jeevanjee, Nadir,et al."On the Cooling-to-Space Approximation".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.2(2020):465-478. |
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