Line-by-line calculations of thermal infrared radiation representative for global condition: CFC-12 as an example

Myhre, Gunnar; Stordal, Frøde; Gausemel, Ingvil; Nielsen, Claus J.; Mahieu, Emmanuel

doi:10.1016/j.jqsrt.2005.04.015

Cited by 25 publications

(33 citation statements)

References 31 publications

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“…Literature values for the RE of CFC‐12 [ Fisher et al ., ; Good et al ., ; Hansen et al ., ; Jain et al ., ; Myhre and Stordal , ; Myhre et al ., ; Myhre et al ., ; Orkin et al ., ; Sihra et al ., ] provide results in the range of 0.30–0.33 W m −2 ppb −1 with a mean of 0.32 W m −2 ppb −1 , while a value of 0.32 W m −2 ppb −1 was used in AR4 (based on Myhre and Stordal []). Differences are caused by differing impact of clouds, absorption cross‐section data, and the vertical profile of decay of the mixing ratio in the stratosphere [ IPCC , ].…”

Section: Resultsmentioning

confidence: 98%

“…Myhre et al . [] found that for calculations of the CFC‐12 RE, the use of two atmospheric profiles (one for tropics and one extra‐tropics) represents global simulations with a horizontal resolution of 2.5º × 2.5º within 1%. In addition, there are several possible choices of tropopause definition that impact on the calculated forcing at the 5% level [ Freckleton et al ., ].…”

Section: Background Conceptsmentioning

confidence: 99%

See 1 more Smart Citation

Global warming potentials and radiative efficiencies of halocarbons and related compounds: A comprehensive review

Hodnebrog

Etminan

Fuglestvedt

et al. 2013

Reviews of Geophysics

430

441

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[1] In the mid-1970s, it was recognized that chlorofluorocarbons (CFCs) were strong greenhouse gases that could have substantial impacts on radiative forcing of climate change, as well as being substances that deplete stratospheric ozone. Around a decade later, this group of radiatively active compounds was expanded to include a large number of replacements for ozone-depleting substances such as chlorocarbons, hydrochlorocarbons, hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), bromofluorocarbons, and bromochlorofluorocarbons. This paper systematically reviews the published literature concerning the radiative efficiencies (REs) of CFCs, bromofluorocarbons and bromochlorofluorocarbons (halons), HCFCs, HFCs, PFCs, sulfur hexafluoride, nitrogen trifluoride, and related halogen containing compounds. In addition, we provide a comprehensive and self-consistent set of new calculations of REs and global warming potentials (GWPs) for these compounds, mostly employing atmospheric lifetimes taken from the available literature. We also present global temperature change potentials for selected gases. Infrared absorption spectra used in the RE calculations were taken from databases and individual studies and from experimental and ab initio computational studies. Evaluations of REs and GWPs are presented for more than 200 compounds. Our calculations yield REs significantly (> 5%) different from those in the Intergovernmental Panel on Climate Change Fourth Assessment Report (AR4) for 49 compounds. We present new RE values for more than 100 gases which were not included in AR4. A widely used simple method to calculate REs and GWPs from absorption spectra and atmospheric lifetimes is assessed and updated. This is the most comprehensive review of the radiative efficiencies and global warming potentials of halogenated compounds performed to date.

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Section: Resultsmentioning

confidence: 98%

Section: Background Conceptsmentioning

confidence: 99%

Global warming potentials and radiative efficiencies of halocarbons and related compounds: A comprehensive review

Hodnebrog

Etminan

Fuglestvedt

et al. 2013

Reviews of Geophysics

430

441

View full text Add to dashboard Cite

show abstract

“…The RF calculations use the Oslo line-by-line (OLBL) code which was described in Myhre et al [2006]. OLBL has contributed, as a benchmark model, to several radiation code intercomparisons including Forster et al [2005Forster et al [ , 2011, Myhre et al [2009], and Randles et al [2013].…”

Section: Methodsmentioning

confidence: 99%

“…OLBL has contributed, as a benchmark model, to several radiation code intercomparisons including Forster et al [2005Forster et al [ , 2011, Myhre et al [2009], and Randles et al [2013]. We use the Myhre et al [2006] two-atmosphere (tropical/ extratropical) approach, which includes cloud data from the International Satellite Cloud Climatology Project, to generate global forcings. OLBL code is based on the GENLN2 LBL code, which was used to generate the clear-sky forcings presented in MHSS98, but it has been enhanced in a number of important ways.…”

Section: Methodsmentioning

confidence: 99%

Radiative forcing of carbon dioxide, methane, and nitrous oxide: A significant revision of the methane radiative forcing

Etminan

Myhre

Highwood

et al. 2016

Geophysical Research Letters

765

588

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New calculations of the radiative forcing (RF) are presented for the three main well‐mixed greenhouse gases, methane, nitrous oxide, and carbon dioxide. Methane's RF is particularly impacted because of the inclusion of the shortwave forcing; the 1750–2011 RF is about 25% higher (increasing from 0.48 W m−2 to 0.61 W m−2) compared to the value in the Intergovernmental Panel on Climate Change (IPCC) 2013 assessment; the 100 year global warming potential is 14% higher than the IPCC value. We present new simplified expressions to calculate RF. Unlike previous expressions used by IPCC, the new ones include the overlap between CO2 and N2O; for N2O forcing, the CO2 overlap can be as important as the CH4 overlap. The 1750–2011 CO2 RF is within 1% of IPCC's value but is about 10% higher when CO2 amounts reach 2000 ppm, a value projected to be possible under the extended RCP8.5 scenario.

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“…However, this method is too time-consuming. Researchers thus use a globally averaged atmospheric profile or an average for certain profiles [28][29][30]. Here, we use three model atmospheric profiles (tropical (TRO), mid-latitude summer (MLS), and mid-latitude winter (MLW)) (Anderson et al [31]) to determine the global mean radiative flux.…”

Section: Radiative Forcing Gwp and Gtp Due To Nfmentioning

confidence: 99%

Inhomogeneous Radiative Forcing of NF3

Zhang

2017

Atmosphere

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Nitrogen trifluoride (NF 3 ) has the potential to make a growing contribution to the Earth's radiative budget. In this study, the global mean radiative efficiency of NF 3 is calculated as 0.188 W·m −2 ·ppb −1 by line-by-line method. Global warming potentials of 14,700 for 100 years and global temperature potentials of 16,600 for 100 years are calculated. At the same time, inhomogeneous instantaneous radiative forcing of NF 3 at the top of the atmosphere and its relationship to other atmospheric and surface variables are studied. A total of 42 atmospheric profiles are used. The results show NF 3 instantaneous radiative efficiency range from 0.07 W·m −2 ·ppb −1 to 0.50 W·m −2 ·ppb −1 in clear sky conditions. The mean value is 0.25 W·m −2 ·ppb −1 . In clear sky conditions, the correlation coefficient between surface temperature and NF 3 instantaneous radiative forcing is 0.94 and the partial correlation coefficient is −0.88 between integrated water content and NF 3 instantaneous radiative forcing. A regression model is constructed for NF 3 instantaneous radiative forcing based on surface temperature and integrated water content. The average value of the relative error is 6.17% based on LBLRTM (Line-by-Line Radiative Transfer Model) results. The correlation coefficient is 0.985 between cloud radiative forcing and the difference of NF 3 instantaneous radiative forcing between clear sky and all cloudy sky conditions. A regression model is constructed for NF 3 instantaneous radiative forcing in all cloudy sky. The average relative error is 5.9% based on LBLRTM results.

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Line-by-line calculations of thermal infrared radiation representative for global condition: CFC-12 as an example

Cited by 25 publications

References 31 publications

Global warming potentials and radiative efficiencies of halocarbons and related compounds: A comprehensive review

Global warming potentials and radiative efficiencies of halocarbons and related compounds: A comprehensive review

Radiative forcing of carbon dioxide, methane, and nitrous oxide: A significant revision of the methane radiative forcing

Inhomogeneous Radiative Forcing of NF3

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