| Budget Amount *help |
¥46,540,000 (Direct Cost: ¥35,800,000、Indirect Cost: ¥10,740,000)
Fiscal Year 2014: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2013: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2012: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2011: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2010: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
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| Outline of Final Research Achievements |
Most acceptable candidates as replacement compounds for chlorofluorocarbons (CFCs) are hydorofluoroethers (HFEs) and hydrofluoroolefins (HFOs). The rate constants of reaction of these chemical species with OH radical were determined by laboratory experiments. Based on these constants, atmospheric lifetimes of the compounds were estimated, and global warming potentials (GWPs) were updated. On the other hand, chemical transport model based on a global circulation model (GCM) have been developed to calculate the global distribution and radiative forcing of these replacement compounds in the atmosphere. After achieving a stable state in concentration of the compounds in interest, globally integrated radiative forcing can be evaluated. We propose, as a conclusion, to use these values as a new measure to represent more reliable climate impacts of replacement compounds which have shorter lifetimes in the atmosphere.
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