17:15 〜 19:15
[ACG46-P01] Greenhouse Gas Budget Assessment of Myanmar (2000–2019)
キーワード：温室効果ガス収支、ミャンマー、二酸化炭素フラックス、メタンフラックス
Greenhouse Gas (GHG) budgets of the global regions have been assessed by the 2nd phase of the REgional Carbon Cycle Assessment and Processes (RECCAP-2), but country-scale budgets are necessary to build national policies for achieving the Paris Agreement. Myanmar, which ratified the Paris Agreement in 2017, is a developing country with an economy heavily depending on forestry and agriculture and characterized by political instability. To date, GHG budgets have never been estimated in such a country, even under RECCAP2. By using the League of geophysical research eXcellences for tropical asia (LeXtra) national GHG budget dataset, this study estimates GHG budgets (CO2, CH4, and their sum) of Myanmar for 2000-2019 with the aim of identifying whether the country has been a net source or sink of GHG and the major components comprising the GHG budgets.
We found that Myanmar was a weak net sink of CO2 with the gross uptake and emissions of 408.93 TgCO2 yr-1 and 397.88 TgCO2 yr-1, respectively. CH4 emissions contribute an additional 104.21 TgCO2eq yr-1, yielding the total GHG budget of Myanmar being a net source. The major sink of CO2 comes from natural vegetation (179.1 TgCO2 yr-1) followed by the forest regrowth after land-use changes (170.31 TgCO2 yr-1). The major sources of CO2 were land use changes on forests (295.1 TgCO2 yr-1) followed by biomass burning (36.8 TgCO2 yr-1), outgassing from rivers and lakes (36.16 TgCO2 yr-1), and CH4 emission from rice cultivation (33.66 TgCO2eq yr-1). In Myanmar, most GHG emissions were of ecosystem origin, regardless of anthropogenic or natural. In contrast, industrial emissions such as those from fossil fuel burning were relatively small compared to the emissions from ecosystems. To achieve the Paris Agreement goal, Myanmar needs to facilitate the reduction of GHG emissions particularly from land-use changes on forests.
We found that Myanmar was a weak net sink of CO2 with the gross uptake and emissions of 408.93 TgCO2 yr-1 and 397.88 TgCO2 yr-1, respectively. CH4 emissions contribute an additional 104.21 TgCO2eq yr-1, yielding the total GHG budget of Myanmar being a net source. The major sink of CO2 comes from natural vegetation (179.1 TgCO2 yr-1) followed by the forest regrowth after land-use changes (170.31 TgCO2 yr-1). The major sources of CO2 were land use changes on forests (295.1 TgCO2 yr-1) followed by biomass burning (36.8 TgCO2 yr-1), outgassing from rivers and lakes (36.16 TgCO2 yr-1), and CH4 emission from rice cultivation (33.66 TgCO2eq yr-1). In Myanmar, most GHG emissions were of ecosystem origin, regardless of anthropogenic or natural. In contrast, industrial emissions such as those from fossil fuel burning were relatively small compared to the emissions from ecosystems. To achieve the Paris Agreement goal, Myanmar needs to facilitate the reduction of GHG emissions particularly from land-use changes on forests.