OM2: Farm field in Osaka Metropolitan University
General site detail (Updated 24 May 2023)
Site name
Farm field in Osaka Metropolitan University
AsiaFlux site code
OM2
Location Sakai, Osaka, Japan
Position 34°32'32.83"N, 135°30'29.62"E
Elevation 30 m above sea level
Slope 0 deg
Terrain type
Flat
Area 0.31 ha
Fetch 50 m
Climate Warm temperature (Cfa)
Mean annual air temperature
15.6°C
Mean annual precipitation
1206.9 mm
Vegetation type
Weed grassed
Dominant species (Overstory)
-
Dominant species (Understory)
Paspalum dilatatum, Setaria viridis, Eleusine indica,
Bromus japonicus, Kyllinga brevifolia, Cyperus
polystachyos, Juncus decipiens, Commelina
communis, Solidago canadensis, Bidens Pilosa,
Lactuca indica, Vicia villosa, Runmex japonicus,
Persicaria longiseta, Ranunculus cantoniensis,
Achyranthes bidentata, Oenanthe javanica
Canopy height
Several tens of centimeters
Age Less than one year
LAI 0 ~ 5
Soil type
pseudo-gray soil
Observations
Eddy Covariance method (CO2)
System Open-path eddy covariance
Wind speed
Sonic anemometer (81000RE, R. M. Young)
Air temperature
Sonic anemometer (81000RE, R. M. Young)
Water vapor
Open-path CO2/H2O analyzer (LI-7500, Li-Cor)
CO2 Open-path CO2/H2O analyzer (LI-7500, Li-Cor)
Measurement height
1.65 m
Sampling frequency
10 Hz
Averaging time
30 minutes
Data logger
CR1000 (Campbell Scientific Inc.)
Data storage
CF card
Original data
Raw data
Meteorology
Observation items
Levels/Depth Instrument
Global solar radiation
(incoming)
1 m
Radiometer (SR05-A1, Hukseflux)
Global solar radiation
(outgoing)
1 m
Quantum sensor (ML-01, EKO)
Long-wave radiation
(incoming)
- -
Long-wave radiation
(outgoing)
- -
Net radiation
1 m
Net Radiometer (NR LITE2, Kipp&Zonen)
PPFD (incoming)
- -
PPFD (outgoing)
- -
Direct/diffuse radiation
- -
Direct/diffuse PPFD
- -
Air temperature
1.5 m
Platinum resistance thermometer and
capacitive (HMP50, Vaisala)
Humidity 1.5 m
Platinum resistance thermometer and
capacitive (HMP50, Vaisala)
Soil temperature
0, 0.05, 0.1, 0.2,
0.3, 0.4 m
Thermocouples
Soil heat flux
0.05 m
Heat flux plate (HFP01SC, Hukseflux)
Soil water content
0.05, 0.1, 0.2 m
TDR sensor
(CS616, Campbell Scientific Inc.)
Wind speed
1.65 m
Sonic anemometer (81000RE, R. M.
Young)
Wind direction
1.65 m
Sonic anemometer (81000RE, R. M.
Young)
Barometric pressure
- -
Precipitation - -
CO2 concentration
1.65 m
Open-path CO2/H2O analyzer
(LI-7500, Li-Cor)
Transmitted shortwave
radiation
0 m
Quantum sensor (ML-01, EKO)
Canopy temperature
1 m
Radiation thermometer (IT-405N, Horiba)
Other
Phenology Phenological Camera (TLC2000, Brinno)
LAI Twice a month using a plant canopy analyzer (LAI-2000)