BBY: Bibai bog

General site detail (Updated 10 April 2023)
 Site name
 Bibai bog
 AsiaFlux site code
 Location Bibai, Hokkaido, Japan
 Position 43°19' 22.82"N, 141°48'38.51"E
 Elevation 17 m 
 Slope 0 degree
 Terrain type
 Area 22 ha
 Fetch Wetland dominated by Sphagnum moss : 60 m for  
 north, 40 m for south, 100 m for west, and 50 m for 
 Wetland including Sasa : 270 m for north, 220 m for 
 south, 200 m for west, and 330 m for east
 Climate Cool temperate (Dfb)
 Mean annual air temperature
 7.2 ± 0.6 ºC
 Mean annual precipitation
 1170 ± 181 mm
 Vegetation type
 Wetland dominated by Sphagnum moss
 Dominant species (Overstory)
 Sphagnum moss, Rhynchospora fauriei, 
 Rhynchospora alba, Moliniopsis japonica, Aster 
 rugulosus, Lobelia sessilifolia, Sasa palmate, 
Toxicodendron trichocarpum
 Dominant species (Understory)
 Canopy height
 30 to 50 cm
 Age 2000 years
 LAI Maximum ap 2
 Soil type
 4 to 5 m peat on the alluvial plain

Eddy Covariance method (CO2)
 System Open-path eddy covariance
 Wind speed
 Sonic anemometer (CSAT3, Campbell Scientific Inc.)
 Air temperature
 Sonic anemometer (CSAT3, Campbell Scientific Inc.)
 Water vapor
 Open-path CO2/H2O analyzer (EC150, Campbell Scientific Inc.)
 CO2 Open-path CO2/H2O analyzer (EC150, Campbell Scientific Inc.)
 Measurement height
 2.3 m
 Sampling frequency
 10 Hz
 Averaging time
 30 min
 Data logger
 CR6 (Campbell Scientific Inc.)
 Data storage
 microSD card
 Original data
 Raw data

 Observation items
 Levels/ Depth
 Global solar 
 1.9 m 4 component net radiometer (CNR1, Campbell 
 Scientific Inc.)
 Global solar  
 1.9 m
 4 component net radiometer (CNR1, Campbell  
 Scientific Inc.)
 1.9 m 4 component net radiometer (CNR1, Campbell 
 Scientific Inc.)
 1.9 m 4 component net radiometer (CNR1, Campbell 
 Scientific Inc.)
 Net radiation
 PPFD (incoming)
 1.93 m Quantum sensor (CPR-PAR-01, Climatec)
 Quantum sensor (SE-SQ110, Apogee, USA)
 PPFD (outgoing)
 1.93 m
 Quantum sensor (SE-SQ110, Apogee, USA)
 Direct / diffuse 
 Direct / diffuse 
 Air temperature
 1.95 and 
 1.63 m    
 Platinum resistance thermometer and capacitive
 (HMP155, Vaisala)
 Humidity 1.95 and 
 1.63 m    
 Platinum resistance thermometer and capacitive
 (HMP155, Vaisala)
 Soil temperature
 0.5, 5.5, 10.5, 
 20.5, and 30.5 
 15, 20, 25, 35, 
 and 45 cm
 Soil heat flux
 0.1 m
 Heat flux plate (HEP01SC, Hukseflux)
 Soil water 
 0.05 m
 TDR sensor (CS616 Campbell Scientific Inc.)
 Wind speed
 2.3 m
 4.04 m
 2.0 m
Sonic anemometer (CSAT3, Campbell Scientific) 
Aerovane (5103, Young)
Three cup anemometer (010C, MetOne)
 Wind direction
 2.3 m
 4.04 m
Sonic anemometer (CSAT3, Campbell Scientific)
Aerovane (5103, Young)
 2.3 m
 4.04 m
 2.0 m
 Barometer (EC150, Campbell Scientific Inc.)
 Barometer (LI-7700, Li-Cor)
 Barometer (PTB210, Vaisala)
 Precipitation 2.2 m Tipping-bucket rainguage (52,202, R.M.Young)
 2.3 m Open-path CO2/H2O analyzer (EC150, Campbell 
 Scientific Inc.)
 CH4 concentration
 2.3 m
 Open-path CH4 analyzer (LI-7700, Li-Cor) 
 Water Table depth
 Pressure water gauge (HTV010-KP, SENSEZ)
 Soil O
 0.05, 0.1 and 
 0.3 m
 Galvanic-cell type oxygen sensor (KE-25, GS-
 Yuasa), Galvanic-cell type oxygen sensor 
 (MIJ-03 type2, Environmental Measurements 
 Snow Depth
  Ultrasonic distance meter (SR50A, Campbell  
 Scientific Inc.)

Fluxes of non-CO2 gases
 Method Open-path eddy covariance using LI-7700 (Li-Cor)
 Measurement height 2.3 m
 Data logger CR6 (Campbell Scientific Inc.)
 Data storage microSD card

 Soil respiration
 Phenological Camera (TLC2000, Brinno)
 LAI Monthly using a plant canopy analyzer (LAI-2200)
Observation Period and Data Availability
 Measurement Period
 from May 2012 to March 2021
 Measurement Frequency
 Data Availability

 Masahito Ueyama (mueyama[at]
 Osaka Metropolitan University, Graduate School of Agriculture 
 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
 Tel: +81-72-254-9432
 Takashi Hirano (hirano[at] 
 Research Faculty of Agriculture, Hokkaido University 
 Kita-ku, Sapporo 060-8589, Japan
 Yasuhiro Kominami (comy[at]
 National Agriculture and Food Research Organization,
 Hokkaido Agricultural Research Center

 Pole Tower, Electric Power (AC)


 Ueyama, M., Yazaki, T., Hirano, T., Futakuchi, Y., Okamura, M., 2020. 

  Environmental controls on methane fluxes in a cool temperate bog. 

  Agricultural and Forest Meteorology,281, 107852.

 Ueyama, M., Yazaki, T., Hirano, T., Endo, R., 2022. Partitioning methane flux 

  by the eddy covariance method in a cool temperate bog based on a

  Bayesian framework. Agricultural and Forest Meteorology, 108852.

 Ueyama, M., Knox, S. H., Delwiche, K. B., Bansal, S., Riley, W. J., Baldocchi,

  D., Hirano, T., McNicol, G., Schafer, K., Windham-Myers, L., Poulter, B., 

  Jackson, R. B., Chang, K.-Y., Chen, J., Chu, H., Desai, A. R., Gogo, S., Iwata, 

  H., Kang, M., Mammarella, I., Peichl, M., Sonnentag, O., Tuittila, E.-S., Ryu, Y.,

  Euskirchen, E. S., Göckede, M., Jacotot, A., Nilsson, M. B., Sachs, T., 2023. 

  Modeled production, oxidation, and transport processes of wetland 

  methane emissions in temperate, boreal, and Arctic regions. Global

  Change Biology, DOI:10.1111/gcb.1.