[A-CG35] グローバル炭素循環の観測と解析

[ACG35-01] Bottom-up evaluation of CO2 budget in Asia, 1970–2022

*伊藤 昭彦^1,2,3 (1.東京大学、2.海洋研究開発機構、3.国立環境研究所)

キーワード：炭素収支、温室効果ガス、パリ協定、物質循環モデル

Accurate evaluation of CO₂, the most important greenhouse gas, is key to performing climate change mitigation, such as the Paris Agreement, and establishing a low-carbon society. However, although numerous studies have been conducted (e.g., the Global Carbon Budget by the Global Carbon Project), critical uncertainties remain in our quantification and prediction of the CO₂ budget. This study conducted an evaluation of the CO₂ budget in Asia during the period 1970–2022 using a bottom-up approach, which uses biogeochemical models, emission inventories, and surface characteristic data. Anthropogenic CO₂ emissions from industry, fossil fuel mining, agriculture, and waste management were evaluated using the EDGAR 8.0 emission inventory dataset. Net CO2 exchange of non-agricultural vegetation and land-use-caused emissions were estimated using a process-based model, VISIT, driven by historical climate (CRU TS4.07) and land-use data (LUH2). Emissions from wildfires were derived from the GFED4s dataset, which is based on satellite remote sensing of burnt areas. For each source and sink, annual flux maps were developed at a spatial resolution of 0.25 x 0.25 in latitude and longitude, showing spatial and temporal patterns of the CO2 budget. Regional and country-based aggregation results are also shown and compared with previous studies.