The Greenhouse Gas Budget of Southeast Asia for 2000–2019 and Pathways Toward Climate Neutrality

IF 5.5 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Masayuki Kondo, Prabir K. Patra, Josep G. Canadell, Philippe Ciais, Richard A. Houghton, Akihiko Ito, Chandra S. Deshmukh, Tomo'omi Kumagai, Xiangzhong Luo, Umakant Mishra, Atul K. Jain, Wei Li, Gerbrand Koren, Stephen Sitch, Ben Poulter, Hanqin Tian, Ana Bastos, Ronny Lauerwald, Judith A. Rosentreter, Naveen Chandra, Tazu Saeki, Marielle Saunois, Ingrid T. Luijkx, Takashi Maki, Takashi Nakamura, Kirari Hirabayashi, Takeshi Hirano, Nobuko Saigusa
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Abstract

Member countries of the Association of Southeast Asian Nations ratified the Paris Agreement and have initiated their own efforts to reduce greenhouse gas (GHG) emissions. However, the progress of these countries toward climate neutrality remains uncertain. Here, we estimated the combined budget for carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) in Southeast Asia for 2000–2019 using bottom-up and top-down approaches. The CO2 emissions from deforestation were the largest source, followed by anthropogenic fire emissions, which together exceeded the CO2 uptake by natural vegetation and land-use change legacy (e.g., regrowth), yielding a net source of CO2 in the biosphere. The region's biosphere was also a net source of CH4 and N2O, which, combined with the CO2 budget, makes the Southeast Asian biosphere a net source of GHGs to the atmosphere, ranging from 2,003.2 ± 406.1 Tg CO2eq yr−1 (bottom-up) to 2,227.5 ± 572.8 Tg CO2eq yr−1 (top-down) for 2000–2019. Among non-biospheric GHG emissions (e.g., fossil fuels and waste-related emissions), coal usage has resulted in an unprecedented increase in CO2 emissions. The total GHG budget (the biospheric GHG budget plus the non-biospheric GHG fluxes) was calculated as a net source of 3,226.3 ± 406.2 Tg CO2eq yr−1 (bottom-up) and 3,406.4 ± 572.9 Tg CO2eq yr−1 (top-down) for 2000–2019. Our study revealed that Southeast Asia is experiencing the dual challenge of large emissions from deforestation and coal usage, necessitating the implementation of urgent mitigation strategies to ensure climate neutrality.

Abstract Image

2000-2019年东南亚温室气体预算与气候中和之路
东南亚国家联盟(Association of Southeast Asian Nations)成员国批准了《巴黎协定》,并开始了各自减少温室气体排放的努力。然而,这些国家在实现气候中和方面的进展仍不确定。在这里,我们使用自下而上和自上而下的方法估算了2000-2019年东南亚地区二氧化碳(CO2)、甲烷(CH4)和一氧化二氮(N2O)的综合预算。森林砍伐造成的二氧化碳排放是最大的来源,其次是人为火灾排放,它们加起来超过了自然植被和土地利用变化遗留(例如,再生长)对二氧化碳的吸收,产生了生物圈中二氧化碳的净来源。该地区的生物圈也是CH4和N2O的净来源,结合CO2收支,使东南亚生物圈成为2000-2019年大气温室气体的净来源,范围从2,003.2±406.1 Tg CO2eq yr - 1(自下而上)到2,227.5±572.8 Tg CO2eq yr - 1(自上而下)。在非生物圈温室气体排放(例如,化石燃料和与废物有关的排放)中,煤炭的使用导致二氧化碳排放量空前增加。2000-2019年,总温室气体收支(生物圈温室气体收支加上非生物圈温室气体通量)的净来源为3,226.3±406.2 Tg CO2eq yr - 1(自下而上)和3,406.4±572.9 Tg CO2eq yr - 1(自上而下)。我们的研究表明,东南亚正面临着森林砍伐和煤炭使用造成的大量排放的双重挑战,有必要实施紧急缓解战略,以确保气候中立。
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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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