汤加火山喷发SO<sub>2</sub>全球传输扩散态势模拟研究

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Abstract The Lagrangian particle diffusion model FLEXPART (FLEXible PARTicle dispersion model) was applied to study the global SO₂ diffusion from the Tonga volcano eruption in January 2022. The SO₂ source was evaluated and designed based on satellite monitoring information, and the numerical simulation was conducted untill 20th February 2022. The model presented a rather narrower extent of SO₂ diffusion in north-south direction in the early stage of the volcano eruption. Later on, the simulated diffusion extent was graduallly in consistent with the observations. The SO₂ was mainly concentrated in the southern hemisphere, and the westward transmission region was in the latitudes from 0 to 30ºS with a maximum transmission velocity of 22.5º/d. The trans-equatorial transmission was weak in the study period and with weak influence on the northern hemisphere and China. The westward transmission of SO₂ showed inclined shape with higher front and lower rear. The rapidest upward transmission height and the maximum diffusion height were about 27km and 31km respectively. To February 20th, the SO₂ deposition was discovered rarely in a large extent to south of 60ºN, the most parts of the world. The main deposition area was located in the latitudes form 0to 50ºS, and the strongest deposition areas were located in eastern Australia, northwest of Tonga volcano, and in southern parts of South America. The research results can provide data support and ideas for Tonga volcano climate effect assessment.

Key words： Tonga volcano SO₂ diffusion FLEXPART

Received: 06 June 2022

PACS:	X16
	P435

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	SU Xing-tao
	DENG Zhi-wu
	AN Hao

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SU Xing-tao,DENG Zhi-wu,AN Hao. Simulation study on global diffusional transmission of SO₂ from Tonga volcano eruption[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 96-106.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/96

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