Global cycles of greenhouse gases during the last 100 years implied by firn air data

空气数据显示过去 100 年全球温室气体循环

• 批准号: 19540454
• 负责人: SUGAWARA Satoshi
• 金额: $ 2.75万
• 依托单位: Miyagi University of Education
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19540454/
• 关键词: 陸域水循環; 物質循環; フィルン空気; メタン; 同位体比; 重力分離; 空気年代; 二酸化炭素

Air samples were collected from different depths of the firn layer at YM85, Antarctica, and NGRIP, Greenland, respectively, and analyzed for CO_2, and CH_4, concentrations and their isotopic ratios. The CO_2, and CH_4 concentrations at 70m depth at YM85 are 304ppm and 970ppb, respectively. Their effective age was estimated to be about 90 years by using a one-dimensional numerical model. The vertical distribution of CH_4 concentration in the firn layer can be reconstructed by a linear combination of the age distribution functions weighted by the atmospheric CH_4 concentrations in the past.Therefore, the most plausible past atmospheric record of CH_4 can be derived iteratively so that its observed profile in the firn layer was reproduced well. Same method was also applied to the reconstructions of carbon and hydrogen isotopic ratios. Temporal variations of atmospheric CH_4 budget was calculated from the atmospheric histories of concentration and its carbon and hydrogen isotopic ratios. This result shows that the CH_4 emission from biomass burning would be important during last 100 years.

分别从南极YM85和格陵兰岛NGRIP的降雪层不同深度采集了空气样品，分析了CO2和CH4的浓度及其同位素比值。YM85深度70m处的CO_2和CH_4浓度分别为304ppm和970ppb。用一维数值模型估算了它们的有效年龄约为90岁。用过去大气CH4浓度加权的年龄分布函数的线性组合可以重建降雪层中CH4浓度的垂直分布，从而迭代地得到最可信的过去大气CH4记录，从而很好地再现了降雪层中CH4的观测剖面。同样的方法也被应用于碳和氢同位素比率的重建。根据大气浓度历史及其碳、氢同位素比值计算了大气CH4收支的时间变化。这一结果表明，生物质燃烧产生的甲烷排放量在近100年内将是重要的。

项目成果

Temporal variations of atmospheric carbon dioxide in the southernmost part of Japan

• DOI: 10.1111/j.1600-0889.2007.00288.x
• 发表时间: 2007-01
• 期刊: Tellus B: Chemical and Physical Meteorology
• 作者: Xia Zhang;T. Nakazawa;M. Ishizawa;S. Aoki;S. Nakaoka;S. Sugawara;Shamil Maksyutov;T. Saeki;T. Hayasaka

Temporal and spatial variations of the atmospheric CO2 concentration in China

• DOI: 10.1029/2007gl032531
• 发表时间: 2008-02
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Dongqi Zhang;Jie Tang;G. Shi;T. Nakazawa;S. Aoki;S. Sugawara;Min Wen;S. Morimoto;P. Patra;T. Hayasaka;T. Saeki

Possible gravitational separation effect on the mean age of stratospheric air in the Arctic polar vortex

重力分离对北极极涡中平流层空气平均年龄的可能影响

• 发表时间: 2008
• 作者: 石榑勇介;柳澤正久;田中慎一郎;青井宏樹;長谷川直;S. Sugawara
• 通讯作者: S. Sugawara

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Gravitational separation of major atmospheric components and secular trend of the O2/N2 ratio in the stratosphere

主要大气成分的重力分离和平流层 O2/N2 比值的长期趋势

• 发表时间: 2007
• 作者: Ishidoya;et. al.
• 通讯作者: et. al.