| Project/Area Number |
26340016
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Environmental dynamic analysis
|
|---|
| Research Institution | National Institute for Environmental Studies |
|---|
Principal Investigator |
TOHJIMA Yasunori 国立研究開発法人国立環境研究所, 環境計測研究センター, 室長 (40227559)
|
|---|
| Co-Investigator(Renkei-kenkyūsha) |
NOJIRI Yukihiro 弘前大学, 理工学部, 教授 (10150161)
NAKAOKA Shin-ichiro 国立研究開発法人国立環境研究所, 地球環境研究センター, 研究員 (00450164)
|
|---|
| Project Period (FY) |
2014-04-01 – 2017-03-31
|
| Project Status |
Completed (Fiscal Year 2016)
|
| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
|
|---|
| Keywords | 大気中酸素濃度 / 連続測定 / 大気－海洋ガス交換 / 炭素循環 / 酸素/二酸化炭素交換比 / 連続観測 / 酸素／二酸化炭素交換比 / 大気ー海洋ガス交換 / 船上観測 / 酸素/二酸化炭素比 |
|---|
| Outline of Final Research Achievements |
Atmospheric oxygen (O2) concentration over the ocean reflects several oceanic processes including biological production and vertical mixing. To conduct long-term shipboard observations of the atmospheric O2, a durable, continuous and low-flow (10 ml/min) measurement system was developed. A fuel-cell type analyzer and a non-dispersive infrared analyzer were used for the measurements of the O2 and CO2, respectively. To achieve precise measurement, the flow rates and pressures were precisely controlled and the sample air was dried by cold traps (-80℃). Using the measurement system, the atmospheric O2 and CO2 concentrations have been observed onboard a cargo ship sailing between Japan and North America since December 2015. Although the ship movement caused false wavy variations of O2 signal with amplitudes of several tens ppm, hourly averaging considerably suppressed the errors to a level of about 2ppm. The one-year data revealed seasonal variations in the extensive North Pacific region.
|
