Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS04] Atmospheric Chemistry

Thu. May 30, 2019 9:00 AM - 10:30 AM 102 (1F)

convener:Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Sakae Toyoda(Department of Chemical Science and Engineering, Tokyo Institute of Technology), Nawo Eguchi(Kyushu University), Chairperson:Hisahiro Takashima(福岡大学)

9:00 AM - 9:15 AM

[AAS04-16] Toward the Reduction of Radiative Forcing of Methane and Tropospheric Ozone: Aiming at the Emission Control of CH4, NOxand NMVOC in Asia

*Hajime Akimoto1, Tatsuya NNagashima1, Hiroshi Tanimoto1, Zig Klimont2, Markus Amann2 (1.National Institute for Environmental Studies, 2.International Institute for Applied Systems Analysis)

Keywords:Extreme weather, SLCF, Asian emission control

In order to reduce impacts of climate change, including potential further increase of damages due to extreme events related to global warming, reduction of burdens of CH4and tropospheric ozone in Asia are discussed. In order to mitigate the inevitable further increase of radiative forcing (RF) of ca. 0.8 W m-2by 2040 caused by the increase of CO2in 2040, feasible reduction of the industrial RF of methane (CH4) and tropospheric ozone (trop-O3) to the 50% of the values in 2011 are targeted to compensate 50% of the RF increase of CO2. The remaining RF of CH4and trop-O3(0.26 and 0.22 W m-2, respectively) correspond to the historical levels in 1960-1970. The necessary reductions of anthropogenic emissions of CH4, NOxand NMVOC in Asia in 2040 to the level of 1970 from that of 2010 have been estimated to be 35% CH4, 44% NO2, and 22% NMVOC from those of 2010 assuming the same necessary reduction ratio as for the global emissions. The estimated reductions have been compared with the reduction amount proposed in the Solution Report prepared under UN Environment Asia Pacific Office in 2018. The presumed reduction of the Asian emissions by 2030 through introducing of proven control measures are 27, 57 and 55% for CH4, NOxand NMVOC. Thus, the reduction of RF of more than 50% from the reference year of 2010 is feasible for trop-O3if the emissions of NOxand NMVOC from other part of the world could be reduced coherently. Further efforts would be necessary for the reduction RF of CH4by more than 50% of the present value.