Shohei Nomura

Earth System Division,

National Institute for Environmental Studies (NIES)

NIES

Email: cgerdb_admin(at)nies.go.jp

Elevation: 3776 m;

Sampling height: 4 m above ground

Air is sampled at a height of 4 m above ground by a sampling inlet mounted on a water tank which is located next to the building of Mt. Fuji weather station through polytetrafluoroethylene tube to the station room using an air pump. The sampled air is led into a measuring line where it goes through a drying system using a membrane, silica gel of 2000 mL, after which the mixing ratios are determined using a measuring equipment (NDIR).

Because of the limited power supply during winter, the measurement was configured to operate for only about 1.5 h per day. We selected the time period 15:00-16:28 Japan Standard Time (JST) from July 2009 to July 2010. However, we changed the period to 22:00-23:28 JST since August 2010. At 22:00 (or 15:00), room air is introduced into NDIR for 2 minutes. Then outside air is measured for 8 minutes. Next, three working standard gases are measured for 4 minutes each to calibrate the measurement. Generally, this sequence is repeated four times. Calibration of the standard gases is carried out using the NIES09 standard gas series developed by NIES.

The daily values of CO₂ mixing ratio was based on the average of the data from the second (time period for the measurement: 22:24-22:32), third (22:46-22:54), and fourth cycles (23:08-23:16); in other words, the daily data is based on 3 x 6 min (because we discarded the first 2 min data for 8 min data) = 18 minutes of observations. The calibrated CO₂ mixing ratio values are the time-weighted average values calculated from the calibration curve right before and after the measurements.

[Free keywords]

Carbon Dioxide, CO₂, Mt. Fuji, Japan, Asia, Free Troposphere, Mountain Site

[GCMD_Platform]

In Situ Land-based Platforms > Ground Stations

[GCMD_Science]

Atmosphere > Atmospheric Chemistry > Carbon Dioxide

[2022/12/09]

The data from 2009 to 2022 have been compiled, the sampling height modified 5 m to 4m and the project manager changed Dr Yukio Terao. Ver. 2.0.

[2019/10/04]

The data from 2009 to 2019 have been compiled in NASA Ames Format 1001. Ver.1.1.

[2017/06/16]

The data from 2009 to 2016 have been compiled in NASA Ames Format 1001. Ver.1.0.

Hitoshi Mukai

Center for Climate Change Adaptation, NIES

Yukio Terao

Earth System Division, NIES

• Shohei Nomura, Hitoshi Mukai, Yukio Terao, Toshinobu Machida and Yukihiro Nojiri (2017), Six years of atmospheric CO₂ observations at Mt. Fuji recorded with a battery-powered measurement system. Atmospheric Measurement Techniques, 10, 667-680, doi:10.5194/amt-10-667-2017.

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