GDP: Guandu Nature Park Flux Station

General site detail (Updated 21 January 2016)
 Site name
 Guandu Nature Park Flux Station
 AsiaFlux site code
 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
 Climate Cfa
 Mean annual air temperature
 23.0 °C
 Mean annual precipitation
 Vegetation type
 Domestic species (Overstory)
 Brachiaria mutica (Tower 1); Phragmites australis (Tower 2)
 Dominant species (Understory)
 Canopy height
 1.2m (Tower 1); 3.0m (Tower 2)
 Soil type

Eddy Covariance method (CO2)
 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

 Observation items
  Levels/ Depth
 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
 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 
 10cm/20cm  CS-616 (2011/10/12-)
 Wind speed
  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-)
 3.5m  LI-7500 (2010/11/26-)
 Precipitation 3.5m Tipping bucket type Rain Gauge, No. 34-T (OTA  KEIKI SEISAKUSHO CO., LTD., Japan)
 3.5m LI-7500 (2010/11/26-)
 H2O concentration 3.5m LI-7500 (2010/11/26-)
 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
 Data Availability
 Jehn-Yih Juang (
Department of Geography, National Taiwan University
No 1 Sec 4 Roosevelt Rd, Taipei 10617, TAIWAN
 Brachiaria mutica (Tower 1); Phragmites australis (Tower 2)

Research Fund
 Ministry of Science and Technology, Taiwan
National Taiwan University



 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.