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Atmospheric CO mole fraction data observed at Yoyogi, Tokyo

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This data set contains carbon monoxide (CO) mole fractions observed on a roof-top tower of Tokai University (37 m above ground) 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

Creator
Release date
2021/05/10
Temporal coverage
2017/04/01 - 2020/05/31
Data provider
NIES
Email: cgerdb_admin(at)nies.go.jp
DOI
File format
Text
Data volume
7.67 MB
Version
Ver.1.0 (Last updated: 2021/05/10)
Language
English

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Data Set

Parameters
Atmospheric mole fractions of CO
Observation period
From 2017/02/14 (ongoing)
Location
35.66°N, 139.68°E
Altitude
Elevation: 39 m
Sampling height: 37 m above ground
Measurement method
Air samples were taken at the tower height of 37 m above ground and introduced into a Nafion dryer (MD-050-72S; Perma Pure, NJ, USA) to reduce water vapor. The atmospheric CO concentrations have been measured continuously using a wavelength-scanned cavity ring-down spectrometer (WS-CRDS) (G2401; Picarro, CA, USA). The analytical reproducibility (standard deviation of 1-minute averaged values for standard gas measurements) of the CO mole fractions was ~2 ppb.
Calculation method
The 1-minute values were calculated by averaging the raw data from WS-CRDS (typically every 2-3 seconds) in that minute. The hourly values are then calculated by averaging the 1-minute values in that hour.
The CO mole fractions were determined against the NIES 09 CO scales. Three standard gases with different CO concentrations were used to calibrate the WS-CRDS every 50 hours.
Date and time are shown based on Japan standard time (UTC+9:00).
Keywords
[GCMD_Platform]
In Situ Land-based Platforms > Ground Stations
[GCMD_Science]
Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Atmospheric Carbon Monoxide > Carbon Monoxide Surface
Update history
[2021/05/10]
Data of 1-minute average values for April and May, 2017-2020 are released. Ver.1.0

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Contributors

Supervisor
Hirofumi Sugawara*1 (ORCID iD iconorcid.org/0000-0003-2000-6517)
Shigeyuki Ishidoya*2 (ORCID iD iconorcid.org/0000-0001-7448-2899)
Motoki Sasakawa*3 (ORCID iD iconorcid.org/0000-0003-2273-5131)
Toshinobu Machida*3 (ORCID iD iconorcid.org/0000-0003-3312-8775)
*1 National Defense Academy of Japan
*2 National Institute of Advanced Industrial Science and Technology (AIST)
*3 Earth System Division, NIES

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Reference Information

References
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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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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When this data set is referred to in publications, it should be cited in the following format.
Terao et al. (2021), Atmospheric CO mole fraction data observed at Yoyogi, Tokyo, Ver. x.x*1, NIES, DOI:10.17595/20210510.002. (Reference date: YYYY/MM/DD)*2
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