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.

从YM85，南极洲和Ngrip，Greenland的FIRN层的不同深度收集空气样品，并分析了CO_2和CH_4，浓度及其同位素比。 YM85处的70m深度的CO_2和CH_4浓度分别为304ppm和970ppb。通过使用一维数值模型，它们的有效年龄估计约为90年。过去可以通过大气CH_4浓度加权的年龄分布功能的线性组合来重建FIRN层中CH_4浓度的垂直分布。因此，可以在迭代中得出最合理的CH_4大气记录，以使其在FIRN层中观察到的轮廓得到很好的再生。也将相同的方法应用于碳和氢同位素比的重建。大气CH_4预算的时间变化是根据浓度及其碳和氢同位素比的大气历史计算得出的。该结果表明，在过去100年中，生物量燃烧的CH_4排放将很重要。

项目成果

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

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

Long-term variation of the carbon isotopic ratio of stratospheric CO_2

平流层CO_2碳同位素比的长期变化

• 发表时间: 2009
• 期刊: Proceedings of 8th International Carbon Dioxide Conference 8
• 作者: Sugawara;et al.
• 通讯作者: et al.

Gravitational separation detected from O_2/N_2, δ^<15>N of N_2, δ^<18>O of O_2, Ar/N_2 observed in the lowermost part of the stratosphere at northern middle and high latitudes in early spring of 2002

2002年早春北部中高纬度地区平流层最下部观测到的O_2/N_2、N_2的δ^<15>N、O_2的δ^<18>O、Ar/N_2的引力分离

• 发表时间: 2008
• 期刊: Geophys.Res.Lett. 35
• 作者: Ishidoya;S.;Morimoto;S.;Sugawara;S.;Watai;T.;Machida;T.;Aoki;S.;Nakazawa;T.;Yamanouchi;T.
• 通讯作者: T.