Impacts of the eruption of Miyakejima Volcano on air quality over far east Asia
Impacts of the eruption of Miyakejima Volcano on air quality over far east Asia
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DOI：
10.1029/2004jd004762
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发表时间：
2004-11
影响因子：
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通讯作者：
M. Kajino;H. Ueda;H. Satsumabayashi;Junling An
中科院分区：
文献类型：
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作者：
M. Kajino;H. Ueda;H. Satsumabayashi;Junling An
b[1]建立了区域尺度的可溶颗粒欧拉模式系统（MSSP），模拟了西北太平洋Miyakejima火山喷发引起的SO42−增加所引起的环境变化。从2000年7月火山爆发开始的一年里，测量到的火山二氧化硫排放量为9 Tg yr−1。它相当于全球火山排放的70%和全球人为排放的6.9%。利用2000年9月~ 2001年8月1年的MSSP模式，结合日本中部山区Happo Ridge观测站的观测资料，研究了降水中火山硫酸盐增加、NH3气-气溶胶分配变化和pH降低的季节变化。冬季以西北风为主，夏季受太平洋副热带高压系统影响，火山SO42 -主要东南向太平洋输送，而火山SO42 -主要西南向日本、韩国和台湾输送。模拟了Happo Ridge地区SO42−浓度的时间变化和NH3的气-气溶胶平衡。在来自亚洲大陆的羽流中，98.7%的总SO42−是人为的，63.5%的NH3以（NH4）2SO4的形式存在于气溶胶相。火山柱中95.5%为火山，过量硫酸盐将100%的NH3固定在气溶胶相中，气溶胶被强烈酸化。模拟的日本降水年平均pH值降低了0.3 ~ 1.0，相当于黄沙的中和作用。
[1] A regional-scale Eulerian Model System for Soluble Particles (MSSP) was constructed to simulate environmental changes caused by a SO42− increase as the result of the eruption of Miyakejima Volcano in the northwest Pacific Ocean. The measured volcanic SO2 emission was 9 Tg yr−1 for a year from the beginning of the eruption, July 2000. It is equivalent to 70% of global volcanic emission and 6.9% of global anthropogenic emission. Seasonal variations of the volcanic sulfate increase, and change of gas-aerosol partitioning of NH3 and pH decrease of precipitation were studied using the MSSP model for 1 year from September 2000 to August 2001, together with observations performed at Happo Ridge observatory in the mountainous area in central Japan. In winter, northwesterly wind prevails, and volcanic SO42− was mainly transported southeastward to the Pacific Ocean while volcanic SO42− was transported southwestward to Japan, Korea, and Taiwan, owing to the subtropical high-pressure system over the Pacific Ocean in summer. Temporal variations of SO42− concentrations and gas-aerosol equilibrium of NH3 at Happo Ridge were well-simulated. In the plume from the Asian continent, 98.7% of total SO42− was anthropogenic, and 63.5% of NH3 existed in aerosol phase as (NH4)2SO4. In the volcanic plume, 95.5% was volcanic, excessive sulfate fixed 100% of NH3 into aerosol phase, and aerosol was strongly acidified. Modeled annual mean pH of precipitation in Japan decreased by 0.3–1.0, which is equivalent to neutralization by yellow sand.