GDP - AsiaFlux

GDP: Guandu Nature Park Flux Station

General site detail (Updated 21 January 2016)

Site name	Guandu Nature Park Flux Station
AsiaFlux site code	GDP
Location	Guandu Natural Park, Taipei City, Taiwan
Position	121° 28' E, 25° 07' N
Elevation	4 m above sea level
Slope	0 %
Terrain type	Grass marsh
Area
Fetch
Climate	Cfa
Mean annual air temperature	23.0 °C
Mean annual precipitation	2405.1mm
Vegetation type	Grass
Domestic species (Overstory)	Brachiaria mutica (Tower 1); Phragmites australis (Tower 2)
Dominant species (Understory)	-
Canopy height	1.2m (Tower 1); 3.0m (Tower 2)
Age
LAI
Soil type	Clay

Observations
Eddy Covariance method (CO₂)

System
Wind speed	YOUNG81000 (2010/11/26-2014/3/26) CSAT-3 (2014/3/27-)
Air temperature	Sonic temperature (2010/11/26-2015/10/28) J-type thermocouple (2015/10/28-)
Water vapor	LI-7500 (2010/11/26-)
CO₂	LI-7500 (2010/11/26-)
Measurement height	3.5 m
Sampling frequency	10 Hz
Averaging time	30 min
Data logger	CR1000 (Campbell, USA)
Data storage	CF card / PC
Original data	Raw data

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	3.5 m	CNR-1
Global solar radiation (outgoing)	3.5 m	CNR-1
Long-wave radiation(incoming)	3.5 m	CNR-1
Long-wave radiation(outgoing)	3.5 m	CNR-1
Net radiation	3.5 m	CNR-1
PPFD (incoming)	3.5 m	LI-190
PPFD (outgoing)	-
Direct / diffuse radiation	-
Direct / diffuse PPFD	-
Air temperature	3.5 m	HMP-45C (2010/12/21-) J-type thermocouple (2015/10/28-)
Humidity	3.5 m	HMP-45C (2010/12/21-)
Soil temperature	10cm/20cm	J-type thermocouple (2011/6/1-2014/4/9)
Soil heat flux	10cm/20cm	HFP01 (2011/6/1-2014/4/9)
Soil water content	10cm/20cm	CS-616 (2011/10/12-)
Wind speed	3.5m	YOUNG81000 (2010/11/26-2014/3/26) 　CSAT-3 (2014/3/27-)
Wind direction	3.5m	YOUNG81000 (2010/11/26-2014/3/26) 　CSAT-3 (2014/3/27-)
Barometric pressure	3.5m	LI-7500 (2010/11/26-)
Precipitation	3.5m	Tipping bucket type Rain Gauge, No. 34-T (OTA KEIKI SEISAKUSHO CO., LTD., Japan)
CO₂concentration	3.5m	LI-7500 (2010/11/26-)
H₂O concentration	3.5m	LI-7500 (2010/11/26-)

Other

Lysimeter	-
Throughfall	-
Sapflow	-
Soil respiration	-

Observation Period and data Availability

Measurement Period	2010/11/26~(now) (Tower 1); 2012/12/09~2015/08/04 (Tower 2)
Measurement Frequency	10Hz
Data Availability	-

Contact

Jehn-Yih Juang (jjuang@ntu.edu.tw)
Department of Geography, National Taiwan University
No 1 Sec 4 Roosevelt Rd, Taipei 10617, TAIWAN

Infrastructure

Brachiaria mutica (Tower 1); Phragmites australis (Tower 2)

Research Fund

Ministry of Science and Technology, Taiwan
National Taiwan University

URL

http://homepage.ntu.edu.tw/~jjuang/

Publication

1. Lin K-M, Juang J-Y and Chang L-F (accepted), Improving Estimation of Bowen Ratio for Application in Air Quality Models by Integrating a Simplified Analytical Expression with Measurement Data, Journal of Applied Meteorology and Climatology

2. Lee S-C, Fan C-J, Wu Z-Y and Juang J-Y (2015) Investigating effect of environmental controls on dynamics of CO2 budget in a subtropical estuarial marsh wetland ecosystem, Environmental Research Letters,10 025005.