Micrometeorological CO2 Flux Data at Teshio CC-LaG Experiment site (TSE)

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The Teshio CC-LaG Experiment site (TSE) is located in a conifer-broadleaf mixed forest in the northernmost part of Japan. In order to observe the effects of forestry activities on the carbon, water and materials cycles of forest ecosystems, long-term monitoring of CO2 flux was started in 2001. The trees in the area of 13.7 ha were clear-cut and larch trees were planted in 2003. We monitor and evaluate the changes in forest ecosystem structure and functions along with the growth of larch, and assess the impacts on the process of carbon cycle on a regional scale by applying particular techniques such as the eddy covariance method and remote sensing. This data set includes ecosystem CO2 flux, and sensible and latent heat flux which were measured with eddy covariance methods, and meteorological items, such as temperature, precipitation, wind, and radiation. The meteorological conditions affect plants growth, and they were measured at multiple points of height/depth ranging from 32m height on a flux observation tower to 1.2m depth at forest floor. This dataset is also provided by the AsiaFlux Database (http://asiaflux.net/index.php?page_id=23).


Kentaro Takagi
Field Science Center for Northern Biosphere, Teshio Experimental Forest, Hokkaido University
Researcher Info (URL): https://researchmap.jp/read0065362?lang=en
ORCID iD: https://orcid.org/0000-0002-1321-2841
Release date
Temporal coverage
2001/08/01 - 2012/12/31
Data provider
National Institute for Environmental Studies
Email: cgerdb_admin(at)nies.go.jp
File format
Data volume
77.7 MB
ver.1.2 (Last updated: 2022/10/06)

Data Set

Net ecosystem CO2 exchange
CO2 flux
CO2 concentration
Sensible heat flux
Latent heat flux
Friction velocity
Global solar radiation (incoming)
Global solar radiation (outgoing)
Long-wave radiation (incoming)
Long-wave radiation (outgoing)
Net Radiation
Photosynthetic active photon flux density (downward)
Wind direction
Wind speed
Air temperature
Relative humidity
H2O concentration
Soil temperature
Ground heat flux
Soil water content
Barometric pressure
Atmospheric stability parameter
Snow depth
Time resolution
30 minutes
Observation period
From 2001/08/01 (ongoing)
Observation site
Teshio CC-LaG Experiment site (TSE)
Location: 45.0558°N, 142.1073°E
Elevation: 70 m
Sampling height: 32, 5.7, 4.6, 3, 2, -0.01, -0.02, -0.05, -0.1, -0.2, -0.3, -0.4, -0.6, -0.8, -1.2 m
Measurement method
The observations at Teshio CC-LAG Experiment forest (TSE) started in a cool-temperate mixed forest in 2001, then, the forest was clear-cut and larch trees were planted in 2003. The changes in carbon cycle in a forest ecosystem with the growth of larch was monitored for long time with eddy covariance methods.
[Before the clear cut] Open- and closed path NDIR-gas analyzer were used at the height of 32 m, ca. 10 m above canopy surface. For closed-path system, the air was sampled from a inlet at the height of 32m, through a tube of 6m-long, to the gas analyzer.
[After the clear cut] The open-path sensor was set at the height of 4.6 m, which was ca. 4 m above canopy surface (from June to September 2003), and ca. 3 m above canopy surface (in 2006) . In addition, two closed-path NDIR-gas analyzers were used at the height of gas inlet 32 and 4.6 m, which were ca. 30 & 3 m (in 2005) above canopy surface. The flux data were sampled and logged at frequency of 10 Hz.
Calculation method
The CO2 concentration measured by closed-path gas analyzer was calibrated once a day using two standard CO2 gases. The net ecosystem exchange (NEE) of CO2 was derived from the sum of the flux measured by EC (F_EC) and the rate of change in column CO2 storage under EC measurement height (Fs). Half-hourly mean F_EC was calculated as the covariance between fluctuations in vertical wind speed and scalar quantity of CO2 concentration. The setting of the quality control applied to the 30-minute value of the turbulent flux is described in the information file attached to this data together with the source. Before clear cut, half-hourly mean Fs was estimated by the relationship between the daily Fs calculated from the profile data and that calculated from the change in the CO2 concentration only at 32 m, obtained in 2002. Estimated daily Fs was divided equally among each 30 min value in the day. After clear cut, Fs was not evaluated.
[Free keywords]
Net ecosystem CO2 exchange
Eddy covariance method
Micro meteorology
Larch plantation
Conifer-broadleaf mixed forest
In Situ Land-based Platforms > Ground Stations
Update history
The flux and meteorological data from 2001 to 2012 have been compiled in Asiaflux Data Base Format, ver.1.2.
The flux data from 2001 to 2005 have been compiled in NASA Ames Format 1001 (text file) and original csv format, ver.1.0.
The meteorological data from 2001 to 2005 have been compiled in NASA Ames Format 1001 (text file) and original csv format, ver.1.1.


Project manager
Yoshiyuki Takahashi
     Center for Global Environmental Research, Earth System Division, National
     Institute for Environmental Studies
     NIES Research Staff Page (URL):
     Researcher Info (URL): https://researchmap.jp/rikuiki2468?lang=en
     ORCID iD: https://orcid.org/0000-0002-7971-3104

Reference Information

Supplementary Materials
・Description of the flux and meteorological data for 2001:
・Description of the gap-filled data for 2001: GfNr_TSE_2001_30m_01-2.pdf
・Site description for 2001: SiIn_TSE_2007_04.pdf
Description of the flux and meteorological data for 2002:
Description of the gap-filled data for 2002: GfNr_TSE_2002_30m_01-2.pdf
Site description for 2002: SiIn_TSE_2007_04.pdf
Description of the flux and meteorological data for 2004:
Description of the gap-filled data for 2004: GfNr_TSE_2004_30m_01-2.pdf
Site description for 2004: SiIn_TSE_2008_05.pdf
Description of the flux and meteorological data for 2005:
Description of the gap-filled data for 2005: GfNr_TSE_2005_30m_01-2.pdf
Site description for 2005: SiIn_TSE_2008_05.pdf
Description of the flux and meteorological data for 2006-2012:
Site description for 2006-2012: SiIn_TSE_2014_08.pdf
Correspondence table for parameters from ver. 1.0 to ver.1.2:
Download supplementary materials
Aguilos, M., Takagi, K., Liang, N., Ueyama, M., Fukuzawa, K., Nomura, M., Kishida, O., Fukazawa, T., Takahashi, H., Kotsuka, C., Sakai, R., Ito, K., Watanabe, Y., Fujinuma, Y., Takahashi, Y., Murayama, T., Saigusa, N., and Sasa, K. (2014) Dynamics of ecosystem carbon balance recovering from a clear‐cutting in a cool‐temperate forest, Agricultural and Forest Meteorology, 197, 26‐39. DOI: 10.1016/j.agrformet.2014.06.002.
Takagi, K., Fukuzawa, K., Liang, N., Kayama, M., Nomura, M., Hojyo, H., Sugata, S., Shibata, H., Fukazawa, T., Nakaji, T., Oguma, H., Mano, M. Akibayashi, Y., Murayama, T., Koike, T., Sasa, K., Fujinuma, Y. (2009) Change in the CO2 balance under a series of forestry activities in a cool-temperate mixed forest with dense undergrowth. Global Change Biology, 15, 1275-1288. DOI: 10.1111/j.1365-2486.2008.01795.x.
Takagi, K., Nomura, M., Ashiya, D., Takahashi, H., Sasa, K., Fujinuma, Y., Shibata, H., Akibayashi, Y. and Koike, T. (2005) Dynamic carbon dioxide exchange through snowpack by wind‐driven mass transfer in a conifer‐broadleaf mixed forest in northernmost Japan. Global Biogeochemical Cycles, 19, GB2012. DOI: 10.1029/2004GB002272.

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Talagi and Takahashi (2022), Micrometeorological CO2 Flux Data at Teshio CG-LaG Experriment Site (TSE), Ver.x.x *1, National Institute for Environmental Studies, DOI:10.17595/20221006.001, (Reference date*2: YYYY/MM/DD)
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