Site name	Dongtan Monitoring Station of Global Carbon Flux,  Chongming, Shanghai No.3
AsiaFlux site code	CM3
Location	East shore of Chongming Island, Shanghai, China
Position	31º 31.014' N，121º 58.300' E  (World Geodetic System 1984)
Elevation	31.33m (World Geodetic System 1984)
Slope	Plane and flat (<1%)
Terrain type	Flat
Area	230 km2
Fetch	500 m for all directions
Climate	Semitropical monsoon climate
Mean annual air temperature	15.5 ºC (2005)
Mean annual precipitation	1957 mm (2005)
Vegetation type	Brackish marsh
Domestic species (Overstory)	Spartina alterniflora, Phragmites australis, Scirpus  mariqueter
Dominant species (Understory)	N/A
Canopy height	Up to 1.5 to 2.5 m (Spartina and Phragmites), 0.5  to 1 m (Scirpus)
Age	N/A
LAI	N/A
Soil type	Clay loam (Wu et al., 2005)

Observations
Eddy Covariance method (CO₂)

System	Open-path system
Wind speed	3 - axis Ultrasonic anemometer
Air temperature	3 - axis Ultrasonic anemometer
Water vapor	Open-path infrared gas analyzer
CO2	Open-path infrared gas analyzer
Measurement height	4.8 m
Sampling frequency	10 Hz
Averaging time	30 min
Data logger	CR5000 (Campbell,USA)
Data storage	CF
Original data	Binary data files, Excel worksheets

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	4.8 m	CNR1, Kipp and Zonen, Delft, Holland
Global solar  radiation (outgoing)	4.8 m	CNR1, Kipp and Zonen, Delft, Holland
Long-wave radiation(outgoing)	4.8 m	CNR1, Kipp and Zonen, Delft, Holland
Long-wave radiation(outgoing)	4.8 m	CNR1, Kipp and Zonen, Delft, Holland
Net radiation	-
PPFD (incoming)	5 m	Li190SB,Li-Cor Inc., Lincoln, NE, USA
PPFD (outgoing)	-
Direct / diffuse radiation	-
Direct / diffuse PPFD	-
Air temperature	1.8, 2.5, 4.8m	HMP-45C, Vaisala, Helsinki, Finland
Humidity	1.8, 2.5, 4.8m	HMP-45C, Vaisala, Helsinki, Finland
Soil temperature	5cm before  Mar. 2006 ; 1,  5, 10 after that	Model 107, Campbell Scientific Inc., Logan, UT,  USA
Soil heat flux	5cm before  Mar. 2006 ; 1,  5, 10 after that	HFT-3, Campbell Scientific Inc., Logan, UT, USA
Soil water   content	-
Wind speed	4.8 m	CSAT-3, Campbell Scientific Inc., Logan, UT,  USA
Wind direction	4.8 m	CSAT-3, Campbell Scientific Inc., Logan, UT,  USA
Barometric   pressure	-
Precipitation	4.5 m	TE525, Texas Electronics, Texas, USA
CO2 concentration	4.8 m	Li 7500, Li-Cor Inc., Lincoln, NE, USA
H2O concentration	-

Other

Soil respiration	Li6400, Li-Cor Inc., Lincoln, NE, USA
Photosynthesis	Li8100, Li-Cor Inc., Lincoln, NE, USA
Ecological investigation	Li2000, Li-Cor Inc., Lincoln, NE, USA