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Development of a high-precision, continuous measurement system of atmospheric oxygen concentration in Antarctic region.

开发南极地区大气氧浓度高精度连续测量系统。

基本信息

批准号：
17540418
负责人：
MORIMOTO Shinji
金额：
$ 2.24万
依托单位：
National Institute of Polar Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540418/
关键词：
Carbon Cycle Greenhouse gas Oxygen Concentration Carbon Dioxide

项目摘要

Since variations of atmospheric O_2 concentration are closely related to the global carbon cycle, precise measurements of the O_2 concentration on the order of parts per million will give us a new constraint on the global CO_2 balance research. We have developed a high-precision, continuous measurement system of the atmospheric O_*2 concentration to start an in-situ O_2 measurement at Syowa Station, Antarctica.To improve measurement reproducibility of a commercially available 0_2 analyzer, we at first tried to reduce variations of 0_2 molecule number at the 0_2 sensor by controlling temperature and pressure of the sample air flow. Then, shape and materials of the air sample path were carefully selected to avoid the 0_2 concentration change before analysis. Further, water vapor contained in the sample air was removed by passing the air sample through a Pyrex glass water trap kept at-90°C. At the same time, to reduce the 02 concentration change when the air sample passing the water trap, an active pressure regulation was inserted into the air sample line. Finally, the reproducibility of our 0_2 measurement system reached 0.5-0.8 ppmv. To install the system into Syowa Station, Antarctica, we will make test measurements of the atmospheric 0_2 concentration at Sendai to finalize the development.

由于大气O_2浓度的变化与全球碳循环密切相关，百万分之一量级的O_2浓度的精确测量将为全球CO_2平衡研究提供新的约束。我们开发了高精度、连续测量大气 O_*2 浓度的系统，在南极洲昭和站开始原位 O_2 测量。为了提高市售 0_2 分析仪的测量再现性，我们首先尝试通过控制样品气流的温度和压力来减少 0_2 传感器上 0_2 分子数的变化。然后，仔细选择空气样品路径的形状和材料，以避免分析前0_2的浓度变化。另外，通过使空气样品通过保持在-90℃的Pyrex玻璃除水器，除去样品空气中含有的水蒸气。同时，为了减少空气样品通过脱水器时的O 2 浓度变化，在空气样品管线中插入了主动压力调节装置。最终，我们的0_2测量系统的再现性达到了0.5-0.8 ppmv。为了将该系统安装到南极洲昭和站，我们将在仙台对大气 0_2 浓度进行测试测量，以完成开发。