API: Appi forest meteorology research site

General site detail (Updated 18 May 2009)

Site name	Appi forest meteorology research site
AsiaFlux site code	API
Location	Hachimantai, Iwate, Japan
Position	40º 00' 06" N, 140º 56' 15" E  (World Geodetic System 1984)
Elevation	825m above sea level  (World Geodetic System 1984)
Slope	5.7 degree
Terrain type	N/A
Area	43.5ha
Fetch	More than 300m
Climate	Cool temperate
Mean annual air temperature	6.1 degreeC
Mean annual precipitation	N/A
Vegetation type	Cool temperate deciduous broadleaved forest
Domestic species (Overstory)	Japanese beech (Fagus crenata Blume)
Dominant species (Understory)	N/A
Canopy height	17-19m
Age	Approx. 70 years
LAI	N/A
Soil type	Brown forest soil

Observations
Eddy Covariance method (CO₂)

System	Closed-path system ( CO2 flux)
Wind speed	Three-dimensional sonic anemometer-thermometer (DA600-  3T Probe TR-61C, KAIJO, Japan)
Air temperature	Three-dimensional sonic anemometer-thermometer (DA600-  3T Probe TR-61C, KAIJO, Japan), Platinum resistance  thermometer (HMP45A, VAISALA, Finland)
Water vapor	Capacitive hygrometer (HMP45A, VAISALA, Finland)
CO2	Closed-path (LI-6262, LI-COR, USA)
Measurement height	31 m
Sampling frequency	10 Hz
Averaging time	30 min
Data logger	DRM3b, TEAC, Japan
Data storage	MO
Original data	Raw data

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	31 m	Pyranometer  (CM6F, Kipp & Zonen, Netherland)
Global solar  radiation (outgoing)	31 m	Pyranometer   (CM6B, Kipp & Zonen, Netherland)
Long-wave radiation(outgoing)	31 m	Infrared radiometer with fan  (PIR, Eppley, USA)
Long-wave radiation(outgoing)	31 m	Infrared radiometer   (PIR, Eppley, USA)
Net radiation	-
PPFD (incoming)	31, 18, 15, 12, 9, 6, 3  m	Quantum sensor (LI-190B, LI-COR, USA)
PPFD (outgoing)	31,3 m	Quantum sensor (LI-190B, LI-COR, USA)
Direct / diffuse radiation	-
Direct / diffuse PPFD	-
Air temperature	31, 24, 20, 18, 15, 12,  9, 6, 3 m	Platinum resistance thermometer  (HMP45D, VAISALA, Finland)
Humidity	31, 24, 20, 18, 15, 12,  9, 6, 3 m	Capacitive hygrometer  (HMP45D, VAISALA, Finland)
Soil temperature	0.02, 0.05, 0.1, 0.2,  0.4, 0.8 m	Platinum resistance thermometer
Soil heat flux	0.02 m	Thermopile heat flux sensor  (MF-81,EKO,Japan)
Soil water   content	0.05,0.15,0.30,0.50,  0.80,0.95 m	TDR sensor(CS615,Campbell,USA)
Wind speed	31, 24, 20, 18, 15,12,  9, 6, 3 m	3-cups anemometer  (WM-30P, Ikeda, Japan)
Wind direction	31 m	Vane (A-802, YOKOGAWA, Japan)
Barometric   pressure	5 m	Silicon capacitive absolute pressure sensor  (PTB-100,VAISALA,Finland)
Precipitation	4.5 m	Rain gauge(B-071,YOKOGAWA,Japan)
CO2 concentration	31,24,20,18,15,12,9,3  m	Closed-path CO2/H2O analyzer  (LI-6262, LI-COR, USA)

Other

Soil respiration	Continuous
Photosynthesis	Occasionally
Ecological investigation	Tree heights, stand density, diameter

Observation Period and Data Availability