Variation of Atmospheric Environment as Indicated by Mizuho 700m Core

Mizuho 700m 核心显示的大气环境变化

• 批准号: 01470001
• 负责人: KANAMORI Satoru
• 金额: $ 0.51万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01470001/
• 关键词: Mizuho 700m Core; Mizuho Plateau; Atmospheric Aerosols; Drifting and Fallen Snow; Atmospheric Environment; Cl; Na Ratio; Formic Acid; Methanesulfonic Acid; 700mコア; 南極氷床; Cl; 700mコア試料; 南極雪氷; 重金属元素; メタンスルフォン酸

1) Collection of drifting and fallen snow samples in Mizuho Plateau. -----More than 300 samples of drifting snow and pit snow were collected over Mizuho Plateau, within nearly a month, and in the area from near sea coast to 600Km inland, for characterization of sedimentation of chemical components accompanied with snow fall at the location where the Mizuho 700m Core was taken. Year-round sampling of atmospheric aerosols at Syowa Station and size-fractionated aerosol sampling at 3 inland locations were also carried out.2) Fundamental studies on sedimentation mechanisms of chemical components on Mizuho Plateau. -----At Syowa Station near sea coast, SO_4, methanesulfonic acid and Cl/Na ratio in atmospheric aerosols showed apparent seasonal variation, which controls that of transportation flux of sea-salt components for inland. Chemical composition of drifting snow revealed that sea-salt components reaches some 300Km inland but not to Mizuho Station. The results on pit snow showed annual s … More edimentation flux and also annual variability of chemical component concentrations. Basing upon these results, in the inland area, the presence of the other supply path of chemical components other than sea-salt was concluded.3) Variation of atmospheric environment as indicated by Mizuho 700m Core-----Cl/Na ratio shows the normal sea-salt value in the upper part of the core and changes to high value at the lower part than 500m which corresponds to 5000-9500 YBP. This suggests the occurrence of change in atmospheric circulation. The formic acid concentration shows high and variable value in the upper part, decreases with depth and reaches to low and constant value in 300-600m depth. This suggests the marked increase in formic acid concentration in the atmosphere within the past 2000 years and it seems due to increased burning of forest and fossil fuels. Methanesulfonic acid and organic metal compounds can be fond in the core but their distributions are complex and suggest that they depend upon complex mechanisms. Less

1)收集瑞穗高原的漂流和降雪样品。- 在近一个月的时间内，在瑞穗高原以及从近海海岸到内陆600 km的地区采集了300多个漂流雪和坑雪样品，用于表征瑞穗700 m岩芯采集地点降雪伴随的化学成分沉积。2）对瑞穗高原大气气溶胶化学成分的沉积机理进行了初步研究。- -积雪的化学成分显示，海盐成分到达内陆约300公里，但没有到达瑞穗站。坑雪的结果表明， ...更多信息 沉积通量和化学成分浓度的年变化。3）瑞穗700 m岩芯所反映的大气环境变化--Cl/Na比值显示，在岩芯上部海盐值正常，在500 m以下变为高值，对应于5000-9500 YBP。这表明大气环流发生了变化。甲酸浓度在上部呈高值变化，随深度增加而降低，在300- 600 m深度达到低值恒定值。这表明在过去的2000年里，大气中的甲酸浓度显著增加，这似乎是由于森林和化石燃料燃烧的增加。甲烷磺酸和有机金属化合物可以在核心中找到，但它们的分布是复杂的，并表明它们依赖于复杂的机制。少

项目成果

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