Yukio Terao

Earth System Division, National Institute for Environmental Studies (NIES)

NIES

Email: cgerdb_admin(at)nies.go.jp

Elevation: 1940 m

Sampling height: 7 m above ground

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.

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 nondispersive infrared analyzer (NDIR; LI-COR, LI-6252) was used for analysis.

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 (CO₂-NIES09 scale).

The mole fractions of the respective working standard gases are 379.00, 403.01, 423.84, and 441.10 ppm for CO₂.

[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 Dioxide, CO₂, NIES, Flask sampling

[2022/03/01]

Dataset was created. ver.2022.0.

Hitoshi Mukai

Center for Climate Change Adaptation, NIES

Yukio Terao

Earth System Division, NIES

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

CC BY 4.0 (Creative Commons Attribution 4.0 International)

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), Atmospheric Carbon Dioxide Dry Air Mole Fraction at Nainital, India, ver.xxxx.x ^*1, NIES, DOI:10.17595/20220301.001. (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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