Atmospheric Sulfur Hexafluoride Dry Air Mole Fraction at Comilla, Bangladesh

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The dataset is SF6 dry air mole fraction in the air sample which is collected by the weekly flask sampling at Comilla, Bangaldesh since 2012.

Description

Creator
Release date
2022/03/01
Temporal coverage
2012/06/29 - 2020/12/26
Data provider
NIES
Email: cgerdb_admin(at)nies.go.jp
DOI
File format
Text
Data volume
42 KB
Version
ver.2022.0 (Last updated: 2022/03/01)
Language
English

Data Set

Parameters
SF6 [ppt]
Observation period
From 2012/06/29 (ongoing)
Location
23.43°N, 91.18°E
Altitude
Elevation: 30 m
Sampling height: 8 m above ground
Measurement method
Flask samples were collected from June 2012 in Comilla, Bangladesh. Inlets were mounted at 8 m above ground level (on top of the 5 m tower on the roof of the one-storey weather station building) in CLA. Air samples were collected once a week (usually on Wednesdays) at 14:00 LT into a 1.5 L Pyrex flask with two stopcocks sealed with Viton O-rings via a sampling line. The sampling line contained a diaphragm pump and a freezer for dehumidification by a glass trap. The sampling flow rate was approximately 2 L min−1, and the sample was passed through a −30 ℃ cooler and pressurized to 0.25 MPa after 10 min flushing through the sampling tube and flask. The sampled flasks were packed in a cardboard box and transported to the laboratory of the Center for Global Environmental Research (CGER), National Institute for Environmental Studies, Japan (NIES) (transportation period: 3–7 d), for analyses.
An air sample was passed through a −80 ℃ cold trap for dehumidification and was delivered to each instrument with a flow rate of 40 mL min−1. A gas chromatograph with an electron capture detector (GC-ECD) until 2011 and with a micro-electron capture detector (GC-micro-ECD) from 2012 (Agilent Technologies, HP-6890) were used to analyze.
Calculation method
The sample was injected into the analytical system three times per one flask, and the working standard gases were analyzed after every two flasks. Dry-air mole fractions were measured against each of their working standard gases, which were calibrated with NIES secondary standard gas series (SF6-NIES01 scale).
The mole fractions of the respective working standard gases are 4.65, 9.77, 14.53, and 19.08 ppt for SF6.
Keywords
[GCMD_Platform]
In Situ Land-based Platforms > Ground Stations
[GCMD_Science]
Atmosphere > Atmospheric Chemistry > Sulfur Compounds > Sulfur Hexafluoride
[Free keywords]
Comilla, Bangladesh, Indo-Gangetic Plain, Paddies field, Sulfur Hexafluoride, SF6, NIES, Flask sampling
Update history
[2022/03/01]
Dataset was created. ver.2022.0.

Contributors

Supervisor
Project Manager
Contributor
Shohei Nomura*1, Toshinobu Machida*1, Motoki Sasakawa*1, M. Kawser Ahmed*2, Prabir K. Patra*3
*1 Earth System Division, NIES
*2 University of Dhaka
*3 Research Institute for Global Change, JAMSTEC

Reference Information

Supplementary Materials
References
Nomura, S., Naja, M., Ahmed, M., K., Mukai, H., Terao, Y., Machida, T., Sasakawa, M., and Patra, P. K. (2021). Measurement report: Regional characteristics of seasonal and long-term variations in greenhouse gases at Nainital, India and Comilla, Bangladesh. Atmos. Chem. Phys., 21, 16427–16452, 2021, doi:10.5194/acp-21-16427-2021.

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License
Citation format
When this data set is referred to in publications, it should be cited in the following format.
Terao, Y., Nomura, S., Mukai, H., Machida, T., Sasakawa, M., Ahmed, M. K., and Patra, P. K. (2022), Atmospheric Sulfur Hexafluoride Dry Air Mole Fraction at Comilla, Bangladesh, ver.xxxx.x *1, NIES, DOI:10.17595/20220301.012. (Reference date*2: YYYY/MM/DD)
*1 The version number is indicated in the data file.
*2 As the reference date, please indicate the date you downloaded the files.

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