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SAC: Sakai City Office


General site detail (Updated 10 April 2023)
 Site name
 Sakai City Office
 AsiaFlux site code
 SAC
 Location Sakai, Osaka, Japan
 Position 34º34’25’’N, 135º28’80’’E
 Elevation 17 m 
 Slope 0.0024º(east - west) , 0.0030º (north - south)
 Terrain type
 Flat
 Area -
 Fetch Approximately 2.5 km for west, and more than
 5 km for other directions
 Climate Warm temperate (Cfa)
 Mean annual air temperature
 15.6ºC 
 Mean annual precipitation
 1206.9 mm 
 Vegetation type
 NO vegetation
 Dominant species (Overstory)
 -
 Dominant species (Understory)
 -
 Canopy height
 10.7 ± 3.1 m
 Age -
 LAI 0 
 Soil type
 Concrete and Asphalt

Observations
Eddy Covariance method (CO2)
 System Open-path eddy covariance
 Wind speed
 Sonic anemometer (SAT550, Kaijo), until October, 2018
 Sonic anemometer (CSAT3, Campbell Scientific Inc.),  
 present
 Air temperature
 Sonic anemometer (SAT550, Kaijo), until October, 2018
 Sonic anemometer (CSAT3, Campbell Scientific Inc.),  
 present
 Water vapor
 Open-path CO2/H2O analyzer (LI-7500, Li-COR), until 
 October 2018
 Open-path CO2/H2O analyzer (EC150, Campbell Scientific 
 Inc.), present
 CO2 Open-path CO2/H2O analyzer (LI-7500, Li-COR), until 
 October 2018
 Open-path CO2/H2O analyzer (EC150, Campbell Scientific 
 Inc.), present
 Measurement height
 111.7 m
 Sampling frequency
 10 Hz
 Averaging time
 30 min.
 Data logger
 CR1000X (Campbell Scientific Inc.)
 Data storage
 microSD Card
 Original data
 Raw data

Meteorology
 Observation items
  Levels/ Depth
 Instrument 
 Global solar radiation
 (incoming)
 111 m Quantum sensor (ML-020VM, Eko,Japan)
 Global solar radiation  
 (outgoing)
 111 m
 Quantum sensor (ML-020VM, Eko,Japan)
 Long-wave radiation
 (outgoing) 
 -  
 Long-wave radiation
 (outgoing) 
 - 
 Net radiation
 -  
 PPFD (incoming)
 -  
 PPFD (outgoing)
 - 
 Direct / diffuse radiation
 - 
 Direct / diffuse PPFD
 - 
 Air temperature
 108 m Platinum resistance thermometer and 
 capacitive (HMP50, Vaisala)
 Humidity 108 m Platinum resistance thermometer and 
 capacitive (HMP50, Vaisala)
 Soil temperature
 - 
 Soil heat flux
 - 
 Soil water content 
 - 
 Wind speed
 111.7 m Sonic anemometer (SAT550, Kaijo), until 
 October, 2018
 Sonic anemometer CSAT3, Campbell 
 Scientific Inc.), present
 Wind direction
 111.7 m Sonic anemometer (SAT550, Kaijo), until 
 October, 2018
 Sonic anemometer CSAT3, Campbell 
 Scientific Inc.), present
 Barometric pressure
 - Barometer (PTB110, Vaisala)
 Barometer (Li-7700, Li-Cor)
 Precipitation - 
 CO2 concentration
 111.7 m
 Open-path CO2/H2O analyzer (LI-7500, 
 Li-COR), until October 2018
 Open-path CO2/H2O analyzer (EC150, 
 Campbell Scientific Inc.), present  
 CO2 concentration
 111.7 m
 Closed-path CO2/H2O analyzer (LI-850, 
 Li-Cor)
 Canopy temperature
 108 m
 Radiation thermometer (IT-405N, Horita)
 CH4 concentration
 111.7 m
 Open-path CH4 analyzer (LI-7700, Li-Cor)
 CO concentration
 111.7 m
 Closed-path CO analyzer (Los Gatos 
 Research) 
 NO2 concentration
 111.7 m Closed-path NO2 analyzer (NO2 Monitor, 
 Aerodyne Research Inc.)
 
Fluxes of non-CO2 gases
 Gas CH4, CO, NO2
 Method Eddy covariance method
 Measurement height
 111.7 m
 Data logger
 CR1000X (Campbell Scientific Inc.)
 Data storage
 microSD Card

 
Observation Period and Data Availability
 Measurement Period
 from November 2008 to present
 Measurement Frequency
 Continuous
 Data Availability
 2009 in AsiaFlux Database

Contact
 Masahito Ueyama (mueyama[at]omu.ac.jp)
 Osaka Metropolitan University, Graduate School of Agriculture
 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531 Japan
 Tel: +81-72-254-9432
 https://www.omu.ac.jp/agri/ecolmet/ueyama/research02/index.html

Infrastructure
 Walk-up Tower, Electrical power (AC)



Research Fund
 JSPS KAKENHI (18H03362)

Calibration Information
 Open-path analyzer were calibrated approximately once a year with
 standard CO2 gases and a dew point generator (LI610, Li-Cor).

Publication
 Ueyama, M., Takano, T., 2022. A decade of CO2 flux measured by the
  eddy covariance method including the COVID-19 pandemic period in
  an urban center in Sakai, Japan. Environmental Pollution, 304,119210.

 Ueyama,M., Taguchi, A., Takano, T., 2021. Water vapor emissions from

  urban landscapesin Sakai, Japan. Journal of Hydrology, 598, 126384.

 

 Takano,T., Ueyama, M., 2021. Spatial variations in daytime methane and

  carbon dioxideemissions in two urban landscapes, Sakai, Japan. Urban

  Climate, 36, 100798.

 

 Ueyama,M., Ando, T., 2020. Cooling effect of an urban park by enhanced

  heat transportefficiency. Journal of Agricultural Meteorology, 76, 148-153.

 

 AndoT. and Ueyama, M. 2017. Surface energy exchange in a dense urban

  built-up areabased on two-year eddy covariance measurements in Sakai,

  Japan. Urban Climate,19, 155-169.

 

 Ueyama,M., and Ando T. 2016. Diurnal, weekly, seasonal and spatial

  variabilities incarbon dioxide flux in different urban landscapes in Sakai.

  AtmosphericChemistry and Physics, 16, 14727-14740.


 
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