Site name	Tibet Grassland Site
AsiaFlux site code	TGK
Location	Naqu, Tibet
Position	31.37° N, 91.90° E
Elevation	4580 m a.s.l
Slope	Flat
Terrain type	Plateau
Area	-
Fetch	over 2 km for all direction
Climate	Cool continental climate(Dwc)
Mean annual air temperature	-
Mean annual precipitation	-
Vegetation type	Short grass
Domestic species (Overstory)	-
Dominant species (Understory)	-
Canopy height	< 0.5m
Age	-
LAI	< 0.5
Soil type	Sandy silt loam

Observations
Eddy Covariance method (CO₂)

System	Open-path system  (CO2 flux, latent heat flux)
Wind speed	CSAT3(Campbell, USA) in 1998 /  CSAT3(Campbell Scientific, USA) and   DA-600(Kaijo Denki Co., Ltd., Japan) in 2002
Air temperature	Humidity and temperature probe  (HMP45, Vaisala, the Netherlands)
Water vapor	Krypton hygrometer (KH2O, Campbell Scientific, USA)
CO2	-
Measurement height	3 m
Sampling frequency	20HZ in 1998 / 10Hz in 2002
Averaging time	30 min
Data logger	CR9000  (Campbell, USA)
Data storage	HDD, CD-R
Original data	Raw and Statistics

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	-	Net radiometer  (CNR1, Kipp & Zonen, Netherlands)
Global solar  radiation (outgoing)	-	Net radiometer  (CNR1, Kipp & Zonen, Netherlands)
Long-wave radiation(incoming)	-	Net radiometer  (CNR1, Kipp & Zonen, Netherlands)
Long-wave radiation(outgoing)	-	Net radiometer  (CNR1, Kipp & Zonen, Netherlands)
Net radiation	-	Net radiometer  (CNR1, Kipp & Zonen, Netherlands)
PPFD (incoming)	-
PPFD (outgoing)	-
Direct / diffuse radiation	-
Direct / diffuse PPFD	-
Air temperature	3 m	Fine-wire thermocouple
Humidity	-
Soil temperature	-
Soil heat flux	-
Soil water   content	-
Wind speed	3m in 1998 / 3,  20m in 2002	CSAT3(Campbell Scientific, USA) in 1998 /   DA-600(Kaijo Denki Co. Ltd., Japan; 3,20m) /  CSAT3(Campbell Scientific, USA;20m) in 2002
Wind direction	3m in 1998 / 3,  20m in 2002	CSAT3(Campbell Scientific, USA) in 1998 /   DA-600(Kaijo Denki Co. Ltd., Japan; 3,20m) /  CSAT3(Campbell Scientific, USA;20m) in 2002
Barometric   pressure	-
Precipitation	-	TE525(Campbell Scientific, USA)
CO2 concentration	-
H2O concentration	3m	KH2O(Campbell Scientific, USA)

Other

Soil respiration	-
Photosynthesis	-
Ecological investigation	-