Preprints
https://doi.org/10.5194/acp-2022-667
https://doi.org/10.5194/acp-2022-667
 
07 Nov 2022
07 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Radiative efficiency estimates of (CF3)2CFCN, CF3OCFCF2, and CF3OCF2CF3 using high-resolution Fourier transform infrared spectroscopy

Beni Adi Trisna1, Seungnam Park2, Injun Park3, Jeongsoon Lee1, and Jeong Sik Lim1 Beni Adi Trisna et al.
  • 1Greenhouse Gas Metrology team, Korea Research Institute of Standard and Science (KRISS), Science of Measurement, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
  • 2National Centre of Standard Reference Data (NCSRD), Korea Research Institute of Standard and Science (KRISS), Daejeon, 34113, Republic of Korea
  • 3Interface Materials and Chemical Engineering Research Centre, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea

Abstract. Absorption cross-sections (ACS) of emerging greenhouse gases (GHG) were measured to estimate the radiative efficiencies (RE) using high-resolution Fourier transform infrared spectroscopy (HR-FTIR). For quantitative spectroscopy, the Beer–Lambert parameters of absorber pressure, temperature, and optical pass length (OPL) have been accurately determined to be traceable to the primary standards. The OPL of the multipass cell (MP) mounted on the HR-FTIR spectrometer was spectroscopically calibrated. A ratio of the averaged N2O absorptions was measured in the range of 2,217.4–2,219.0 cm-1 with a spectral resolution of 0.026 cm-1, yielding a ratio of OPLs between the MP and reference cell (RC). This cell-to-cell comparison (CC) method does not include the uncertainty in the referring line strength, thereby reducing the calibration uncertainty compared with a direct line-strength referring method. With the OPL-calibrated MP (3.169 ± 0.079 m), the ACSs were measured at low absorber pressures with a spectral resolution of 2 cm-1, integrated at 10 cm-1 intervals, and multiplied by the new narrow band model to yield the RE values. The RE values of the classic GHGs CF4, SF6, and NF3 were evaluated to be 0.085 ± 0.002, 0.573 ± 0.016, and 0.195 ± 0.008 W m-2 ppb-1, respectively, which are consistent with previously reported values. For the emerging GHGs, the RE values were determined to be 0.201 ± 0.008 W m-2 ppb-1 for (CF3)2CFCN (heptafluoroisobutyronitrile, commercially referred to as Novec-4710), 0.328 ± 0.013 W m-2 ppb-1 for CF3OCFCF2 (perfluoro methyl vinyl ether, PMVE), and 0.544 ± 0.022 W m-2 ppb-1 for CF3OCF2CF3 (1,1,1,2,2-pentafluoro-2-(trifluoromethoxy)ethane, PFMEE).

Beni Adi Trisna et al.

Status: open (until 19 Dec 2022)

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Beni Adi Trisna et al.

Data sets

Measurement report: Radiative efficiency estimates of (CF3)2CFC, CF3OCFCF2, and CF3OCF2CF3 using high-resolution Fourier transform infrared spectroscopy Beni Adi Trisna, Seungnam Park, Injun Park, Jeongsoon Lee, & Jeong Sik Lim https://doi.org/10.5281/zenodo.7132870

Beni Adi Trisna et al.

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Short summary
Radiative efficiency (RE) is a measure of the radiative forcing (RF) for a unit change in the atmospheric concentration of GHG. An accurate estimate of RE is substantial for an accurate assessment of global warming potential (GWP). In this study, we report accurate estimates of RE values of emerging GHGs by using high-resolution FTIR. CF3OCFCF2 and CF3OCF2CF3 are reported for the first time. In addition, hidden errors in RE values of (CF3)2CFCN and CF3OCFCF2 in previous studies are pointed out.
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