Consistent sets of atmospheric lifetimes and radiative forcings on climate for CFC replacements: HCFCs and HFCs

Naik, Vaishali; Jain, Atul K.; Patten, Kenneth O.; Wuebbles, Donald J.

doi:10.1029/1999jd901128

Cited by 75 publications

(106 citation statements)

References 37 publications

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“…While for frequencies the partitioning between harmonic part and anharmonic shift can be formally justified, for IR intensities (G if in Eq. 1) an analogous approach can be employed only as an empirical a posteriori correction (5) In fact, from a formal point of view the total transition moment (μ if ) can be rigorously split between the sum of the double harmonic transition moment and an anharmonic shift which includes both mechanical and electric anharmonicities, but since it is squared, in Eq. 1 the cross terms could not be neglected when the integrated cross section are computed (6) Nonetheless, the results from this work and earlier studies 35,44,60,71,72 point out the reliability of such an empirical approach, which is thus useful in order to improve the accuracy of computed intensities.…”

Section: Hybrid Approachmentioning

confidence: 99%

“…Several research efforts have been devoted to the study of the radiative forcing and, in general, the spectroscopic behavior of the halogenated organics, with aim of assessing the environmental impacts of these compounds, considering the briefand long-term environmental effects, as well as the contribution to climate changes and global warming (see for example Refs. [4][5][6][7]. Indeed, the macroscopic radiation and atmospheric models, employed to understand the atmospheric chemistry as well as to model the Earth's atmosphere and its evolution, need as an input a detailed dataset.…”

Section: Introductionmentioning

confidence: 99%

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Anharmonic theoretical simulations of infrared spectra of halogenated organic compounds

Carnimeo

Puzzarini²,

Tasinato³

et al. 2013

The Journal of Chemical Physics

105

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The recent implementation of the computation of IR intensities beyond the double-harmonic approximation [Bloino, J.; Barone, V. J. Chem. Phys. 2012, 136, 124108] paved the route to routine calculations of infrared spectra for a wide set of molecular systems. Halogenated organic compounds represent an interesting class of molecules, from both an atmospheric and computational point of view, due to the peculiar chemical features related to the halogen atoms. In this work we simulate the IR spectra of eight halogenated molecules (CH 2 F 2 , CHBrF 2 , CH 2 DBr, CF 3 Br, CH 2 CHF, CF 2 CFCl, cis-CHFCHBr, cis-CHFCHI), using two common hybrid and doublehybrid density functionals in conjunction with both double-and triple-zeta quality basis sets (SNSD and cc-pVTZ) as well as employing the coupled-cluster theory with basis sets of at least triple-zeta quality. Finally, we compare our results with available experimental spectra, with the aim of checking the accuracy and the performances of the computational approaches.

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Section: Hybrid Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anharmonic theoretical simulations of infrared spectra of halogenated organic compounds

Carnimeo

Puzzarini²,

Tasinato³

et al. 2013

The Journal of Chemical Physics

105

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“…Earlier versions of the UIUC RTM have been used in studies of climate effects and in the derivation of GWPs Naik et al, 2000). The current version incorporates several improvements over those versions, notably that solar radiation can now be optionally handled with the DISORT multi-stream radiative transfer kernel (Stamnes et al, 1988).…”

Section: Radiative Transfer Modelmentioning

confidence: 99%

Explicit calculation of indirect global warming potentials for halons using atmospheric models

et al. 2009

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Abstract. The concept of Global Warming Potentials (GWPs) has been extensively used in policy consideration as a relative index for comparing the climate impact of an emitted greenhouse gas (GHG), relative to carbon dioxide with equal mass emissions. Ozone depletion due to emission of chlorinated or brominated halocarbons leads to cooling of the climate system in the opposite direction to the direct warming contribution by halocarbons as GHGs. This cooling is a key indirect effect of the halocarbons on climatic radiative forcing, which is accounted for by indirect GWPs. With respect to climate, it is critical to understand net influences considering direct warming and indirect cooling effects especially for Halons due to the greater ozone-depleting efficiency of bromine over chlorine. Until now, the indirect GWPs have been calculated using a parameterized approach based on the concept of Equivalent Effective Stratospheric Chlorine (EESC) and the observed ozone depletion over the last few decades. As a step towards obtaining indirect GWPs through a more robust approach, we use atmospheric models to explicitly calculate the indirect GWPs of Halon-1211 and Halon-1301 for a 100-year time horizon. State-of-theart global chemistry-transport models (CTMs) were used as the computational tools to derive more realistic ozone depletion changes caused by an added pulse emission of the two major Halons at the surface. The radiative forcings on climate from the ozone changes have been calculated for indirect GWPs using an atmospheric radiative transfer model (RTM). The simulated temporal variations of global average total column Halons after a pulse perturbation follow an exponential decay with an e-folding time which is consistent with the expected chemical lifetimes of the Halons. Our cal-

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“…는 5000 (Orkin et al, 2003), 5800 (Drage et al, 2006) 이 있으며, HFC-134a는 1300 (Orkin et al, 2003), 1896 (Naik et al, 2000) (Elrod, 1999 )을 10 cm…”

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Estimation of The Global Warming Potential of Fluorinated Green House Gases

Kim¹,

Lee²

2014

Journal of Korean Society for Atmospheric Environment

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Consistent sets of atmospheric lifetimes and radiative forcings on climate for CFC replacements: HCFCs and HFCs

Cited by 75 publications

References 37 publications

Anharmonic theoretical simulations of infrared spectra of halogenated organic compounds

Anharmonic theoretical simulations of infrared spectra of halogenated organic compounds

Explicit calculation of indirect global warming potentials for halons using atmospheric models

Estimation of The Global Warming Potential of Fluorinated Green House Gases

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