Atmospheric CO2 mole fraction data observed at Yoyogi, Tokyo by AIST
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This data set contains CO2 mole fraction data observed on a roof-top tower of Tokai University (52 m above ground) and the vertical difference in the mole fractions between 52 and 37 m in Yoyogi (YYG; 35.66° N, 139.68° E), Tokyo, Japan. The YYG site is a residential area located near the central part of Tokyo. The main landcover around the site is characterized by residential buildings with a mean height of 9 m.
Description
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Creator
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Shigeyuki Ishidoya (
 orcid.org/0000-0001-7448-2899) National Institute of Advanced Industrial Science and Technology (AIST) |
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Release date
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2021/05/10
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Temporal coverage
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2016/04/01 - 2020/05/31
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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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CSV
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Data volume
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376 KB
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Version
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Ver.1.0 (Last updated: 2021/05/10)
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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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Atmospheric mole fractions of CO2
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| Observation period |
From 2016/03/09 (ongoing)
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| Location |
35.66°N, 139.68°E
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| Altitude |
Elevation: 39 m
Sampling height: 52 m above ground |
| Measurement method |
Continuous measurements of atmospheric CO2 concentrations were taken at the YYG site using a continuous measurement system employing a non-dispersive infrared analyzer (Li-820; LI-COR). The analytical reproducibility of the CO2 concentrations was about 0.06 ppm for 2-minute averaged values (Ishidoya et al., 2017). Air samples were taken at the tower heights of 52 and 37 m alternatively every 10 minutes.
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| Calculation method |
The 10-minute values were calculated by averaging the raw data from Li-820 (every 5 seconds) in that minute. The values observed at 37 m are temporally interpolated into those at 52 m and the vertical differences are caluculated.
The CO2 mole fractions were determined against the TU-10 scales. Two standard gases with different CO2 mole fractions were used to calibrate the Li-820 every 90 minutes. Date and time are shown based on Japan standard time (UTC+9:00). |
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Keywords
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[GCMD_Platform]
In Situ Land-based Platforms > Ground Stations
[GCMD_Science]Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Atmospheric Carbon Dioxide > Carbon Dioxide Surface
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Update history
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[2021/05/10]
Data for April and May, 2016-2020 are released. Ver.1.0
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Contributors
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Supervisor
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Yukio Terao*1 (
orcid.org/0000-0003-2345-7073)Hirofumi Sugawara*2 ( orcid.org/0000-0003-2000-6517)*1 Earth System Division, National Institute for Environmental Studies (NIES) *2 National Defense Academy of Japan |
Reference Information
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References
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Sugawara, H., S. Ishidoya, Y. Terao, Y. Takane, Y. Kikegawa, and K. Nakajima (2021), Anthropogenic CO2 Emissions Changes in An Urban Area of Tokyo, Japan, Due to the COVID-19 Pandemic: A Case Study during the State of Emergency in April–May 2020, in review.
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Ishidoya et al. (2021), Atmospheric CO2 mole fraction data observed at Yoyogi, Tokyo by AIST, Ver. x.x*1, NIES, DOI:10.17595/20210510.003. (Reference date: YYYY/MM/DD)*2
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