Elucidation of global carbon cycle by measuring atmospheric oxygen concentration and carbon isotoptic ratio of carbon dioxide

通过测量大气中的氧气浓度和二氧化碳的碳同位素比来阐明全球碳循环

基本信息

批准号：
13440137
负责人：
AOKI Shuji
金额：
$ 9.02万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440137/
关键词：
Carbon Dioxide Oxygen Isotopic Ratio Land Biosphere Ocean Sink 酸素濃度二酸化炭素濃度標準ガス

项目摘要

In order to evaluate quantitatively how much carbon dioxide (CO2) emitted to the atmosphere by human activities is absorbed by the land biosphere and the ocean, two kinds of approaches have been made. The first approach was made by using measurements of CO2 concentration and the carbon isotopic ratio (d13C), and second was made by using measurements of oxygen (O2) and CO2 concentrations. Absorption of anthropogenic CO2 by the land biosphere and the ocean for the period of 1984 to 2000 were 1.21 and 1.59 GtC/yr, respectively by analyzing CO2 concentration and d13C. As a result, the land biosphere and the ocean were the sink of anthropogenic CO2. The strengths of these CO2 sinks were changed year by year, and it became clear that the biospheric CO2 sink changed in response to El Nino event and abnormal weather caused by the Pinatubo eruption. On the other hand, these CO2 sinks for the period of 1999 to 2003 evaluated by O2 and CO2 concentrations were estimated to be 1.1±1.0 and 2.0±0.6 GtC/yr for the land biosphere and the ocean, respectively. We compared the results obtained from these independent approaches for the period that has overlapped each other mostly. As for the biospheric CO2 sink, the value obtained from CO2 concentration and d13C for the period of 1994 to 2000 was 0.90 GtC/yr, and that obtained from O2 and CO2 concentrations was 1.1±1.0 GtC/yr. As for the oceanic CO2 sink, the value obtained from CO2 concentration and d13C for the period of 1994 to 2000 was 1.73 GtC/yr, and that obtained from O2 and CO2 concentrations was 2.0±0.6 GtC/yr. Since the results obtained by two different approaches agreed quite well, it is thought that reliable results could be obtained.

为了定量评估人类活动排放到大气中的二氧化碳（CO2）被陆地生物圈和海洋吸收的量，采用了两种方法：第一种方法是使用二氧化碳浓度和二氧化碳浓度的测量。碳同位素比（d13C），第二个是通过测量 1984 年至 2000 年期间陆地生物圈和海洋吸收的氧气（O2）和二氧化碳浓度得出的。通过分析 CO2 浓度和 d13C 分别为 1.21 和 1.59 GtC/yr 结果，陆地生物圈和海洋是人为 CO2 汇。这些 CO2 汇的强度逐年变化，并且很明显，生物圈二氧化碳汇因厄尔尼诺事件和皮纳图博火山喷发引起的异常天气而发生变化，而 1999 年期间的二氧化碳汇量则发生了变化。 2003 年，陆地生物圈和海洋的 O2 和 CO2 浓度估计分别为 1.1±1.0 和 2.0±0.6 GtC/年，我们比较了从这些独立方法获得的大部分相互重叠的结果。对于生物圈CO2汇，1994年至2000年期间CO2浓度和d13C得出的值为0.90 GtC/yr，从O2和CO2浓度获得的值为1.1±1.0 GtC/yr 对于海洋CO2汇，从1994年至2000年期间CO2浓度和d13C获得的值为1.73 GtC/yr。从 O2 和 CO2 浓度获得的结果为 2.0±0.6 GtC/yr 由于两种不同方法获得的结果非常一致，因此认为可以获得可靠的结果。