Click Here to Download
The dataset is carbon isotopic ratio (δ13C-CO2) of CO2 in the air sample which is collected by the weekly flask sampling at Nainital, India since 2006.
Description
Creator
|
|
Release date
|
2022/03/01
|
Temporal coverage
|
2006/09/29 - 2020/12/30
|
Data provider
|
NIES
Email: cgerdb_admin(at)nies.go.jp |
DOI
|
|
File format
|
Text
|
Data volume
|
72 KB
|
Version
|
ver.2022.0 (Last updated: 2022/03/01)
|
Language
|
English
|
Data Set
Parameters
|
CO2C13 [‰]
|
Observation period |
From 2006/09/29 (ongoing)
|
Location |
29.36°N, 79.46°E
|
Altitude |
Elevation: 1940 m
Sampling height: 7 m above ground |
Measurement method |
Flask samples were collected from September 2006 in Nainital, India. Inlets were mounted at 7 m above ground level (on the roof of the second floor of the station) in Nainital. 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.
After the mole fraction analysis, we used the remaining air inside the flask for analysis of δ13C-CO2 and δ18O-CO2. The air was introduced into two traps sequentially (−100 and −197 ℃), which trapped H2O and CO2, respectively. Finally, CO2 was sealed in a glass tube. Air δ13C-CO2 and δ18O-CO2 were measured by MT-252 using the working standard CO2 gas which was prepared in our laboratory. |
Calculation method |
The sample was injected into the analytical system 3 times per one sample, and the working standard gases were analyzed after every 6 samples. Values of δ13C-CO2 and δ18O-CO2 were reported against the VPDB scale using working standard gases which were calibrated with the NIES Atmospheric Reference CO2 for Isotopic Studies (NARCIS).
|
Keywords
|
[GCMD_Platform]
In Situ Land-based Platforms > Ground Stations
[GCMD_Science]Atmosphere > Atmospheric Chemistry > Carbon and Hydrocarbon Compounds > Atmospheric Carbon Dioxide
[Free keywords]Nainital, India, Indo-Gangetic Plain, Himalaya, Carbon Isotopic Ratio of Carbon Dioxide, 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, Manish Naja*2
*1 Earth System Division, NIES *2 Aryabhatta Research Institute of Observational Sciences, India |
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.
|
Terms and Conditions of Use*
*By accessing or using the Service you agree to follow these Terms. If you disagree with any part of the Terms, you may not access the Service.
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., and Naja, M. (2022), Carbon Isotopic Ratio (C13/C12) of Carbon Dioxide at Nainital, India, ver.xxxx.x *1, NIES, DOI:10.17595/20220301.013. (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. |
Advisory Service
Advisory service
|
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. |