The measurement method of global warming potential based on the infrared absorption spectra and rate constant with the hydroxyl radical

Global warming potential (GWP) has been used as an indicator to compare with the greenhouse effect of different gases. Utilized gases, especially, in semiconductor and display manufacturing processes are greenhouse gas with high GWP values. Accordingly, countries and relevant companies are trying to synthesize the alternative gases expressed with low GWP values along with a lot of interest. But GWP values of these hasn’t been presented at any other thesis. Hence it is inevitable to measure GWP of newly gases to compare with climate effect between conventionally used gases and newly gases.

Therefore, this study proposes a measurement method of GWP based on various papers using instrument such as fourier-transform infrared spectroscopy (FT-IR), time of flight- mass spectroscopy (TOF-MS) equipped with the proton transfer reaction (PTR) as a detector and so on. Equation is used in IPCC fifth assessment report to calculate the GWP.

• Calculating absorbed cross-sectional area by measuring infrared absorption spectra using FT-IR and by applying to lambert-beer’s law
• Applying original pinnock curve (Pinnock et al., 1995) and final pinnock curve using the line-by-line model (Myhre et al., 2006) to calculate the radiative forcing by integrating the calculated absorbed cross-sectional area from first step
• Measuring the rate constant when they react with the hydroxyl radical using PTR-MS equipped with the PTR and calculating the atmospheric lifetime based on the constant and tropospheric lifetime of CH₃CCl₃ as a reference material proposed by WMO (2014)
• In accordance with the IPCC fifth assessment report (2013), calculating GWP using the radiative forcing and atmospheric lifetime induced by second and third step, respectively

Acknowledgment:

This work was supported by Korea Environment Industry & Technology Institute (KEITI) through Climate Change R&D Project for New Climate Regime Program, funded by Korea Ministry of Environment (MOE) ( 2022003560008 ).