SAC: Sakai City Office
General site details
| 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 |
Observation
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 <br/>Sonic anemometer CSAT3, Campbell Scientific Inc.), present |
| Barometric pressure | - | Barometer (PTB110, Vaisala) Barometer (Li-7700, Li-Cor) |
| Precipitation | - | |
| 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.