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The present data set is a set of daily observational data of background CO2 mixing ratios in midlatitude Asian region, measured at the summit of Mt. Fuji which is the highest mountain in Japan (3776 m a.s.l.) and located in the middle of mainland Japan. Its summit is located in the free troposphere which means it is not affected directly by air at ground level for most of the year. The daily variations of CO2 mixing ratio was not observed and CO2 mixing ratios of Mt. Fuji and aircraft measurement near Mt. Fuji were in good agreement. Therefore, they suggested that the data at the summit of Mt. Fuji could be considered representative of the free-tropospheric CO2 mixing ratio in the midlatitude Asian Region.
Description
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Creator
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Release date
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2017/06/16
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Temporal coverage
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2009/07/21 - 2022/08/22
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Data provider
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NIES
Email: cgerdb_admin(at)nies.go.jp |
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DOI
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File format
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Text
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Data volume
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380 KB
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Version
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Ver.2.0(Last updated: 2022/12/09)
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Language
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English
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Data Set
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Parameters
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CO2 mixing ratios
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Time resolution
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1 day
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Precision
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0.05 ppm
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Observation period
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From 2009 (ongoing)
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Location
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35.3609°N, 138.7271°E
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Altitude
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Elevation: 3776 m;
Sampling height: 4 m above ground |
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Measurement
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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. |
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Calculation method
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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.
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Keywords
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[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
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Update history
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[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.
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Contributors
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Supervisor
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| Project manager |
References
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References
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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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Terms and Conditions of Use*
*By accessing or using the Service you agree to be bound by these Terms. If you disagree with any part of the terms then you may not access the Service.
The author of this data set (hereafter "Author") agrees to the use of this data set by person(s) wishing to use the data (hereafter "User") as stipulated in the Terms and Conditions below.
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Scope of consent
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The User may re-distribute the data to third party without any change or transformation of the data, and may publish new intellectual products (hereafter "Products") based on this data set.
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Conditions for distribution
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The User shall not accept any compensation for the re-distribution of the data of this data set to a third party.
In the event that the User re-distributes the data of this data set to a third party, the same Terms and Conditions apply also to the re-distributed data set. When the User re-distributes the data of this data set to a third party, the User is obliged to inform the third party about the URL of the original data set, the Terms and Conditions of Use, and the fact that the data set is continuously updated by the Author. |
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Use of the latest version
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Unless special reason exists, the User shall use the latest version of this data set.
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Citation policy
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When publishing any Products based on the present data set, it must be clearly stated that the present data set was used.
However, the Author may request the User to delete the citation from the Product. In that case, the User shall comply with the request within reasonable extent. |
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Citation format
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When this data set is referred to in publications, it should be cited in the following format.
Nomura et al. (2017), Daily observational data of atmospheric CO2 mixing ratios at the summit of Mt. Fuji, Ver.x.x *1, Earth System Division, NIES, DOI:10.17595/20170616.001, (Reference date*2: YYYY/MM/DD)
*1 The version number is indicated in the name of each data file. *2 As the reference date, please indicate the date you downloaded the files. However, if the citation format is otherwise determined by the submission guidelines of the journal, the journal submission guidelines are to be followed. |
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Utilization reporting
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Re-distribution of the data or release of Products derived from the data set, shall be reported to the Data Provider without delay.
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Error reporting
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Any error in the data set, or the suspicion thereof, should be immediately reported to the Data Provider.
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Disclaimer
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The Author and the Data Provider shall not have any liability or responsibility whatsoever for any damage that may arise from the use of this data set, and the User must not imply that any guarantee is provided by the Author or the Data Provider. Any injury or loss arising from the use of this data set is solely the responsibility of the User.
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Advisory Service
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Advisory service
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If you need scientific advice or expert opinion regarding the contents or scientific validity of this data set or Products derived from it, we can provide an advisory service based on an individual contract, different from the above one.
Depending on the extent of the help required, we can offer collaboration and/or supervision of the work based on the present data set. If you want to use our advisory service, contact the Data Provider. |