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向大气中发出的二氧化碳（CO2）的数量被土地生物圈和海洋吸收，已经采用了两种方法。第一种方法是通过使用二氧化碳浓度和碳同位素比（D13C）的测量来制定的，第二种方法是通过使用氧（O2）和CO2浓度的测量来制作的。 1984年至2000年，土地生物圈和海洋吸收人为CO2的吸收分别为1.21和1.59 GTC/yr，分析的CO2浓度和D13C分别为1.21 GTC/YR。结果，土地生物圈和海洋是人为二氧化碳的水槽。这些二氧化碳水槽的优势逐年改变，很明显，生物圈二氧化碳水槽会因埃尔尼诺（El Nino）事件和pinatubo爆发引起的异常天气而发生变化。另一方面，对于土地生物圈和海洋，通过O2和二氧化碳浓度评估的1999年至2003年的这些二氧化碳水槽估计分别为1.1±1.0和2.0±0.6 GTC/yr。我们比较了从这些独立方法中获得的结果，该期间主要重叠。至于生物圈二氧化碳水槽，从二氧化碳浓度和D13C获得的值1994年至2000年获得的值为0.90 GTC/yr，从O2和CO2浓度获得的值为1.1±1.0 GTC/yr。至于海洋二氧化碳水槽，1994年至2000年期间从CO2浓度和D13C获得的值为1.73 GTC/YR，从O2和CO2浓度获得的值为2.0±0.6 GTC/yr。由于通过两种不同的方法获得的结果非常同意，因此人们认为可以获得可靠的结果。