SWL: Suwa Lake Site
General site details
| Site name | Suwa Lake Site |
|---|---|
| AsiaFlux site code | SWL |
| Location | Suwa City, Nagano Pref, Japan |
| Position | 36º 02' 47.66" N, 138º 06' 30.07"E |
| Elevation | 759 m above sea level |
| Slope | 0 deg |
| Terrain type | Flat |
| Area | 1330 ha |
| Fetch | 3500 to 4500 for the dominant wind direction |
| Climate | Subarctic humid climate (Dfc) |
| Mean annual air temperature | - |
| Mean annual precipitation | - |
| Vegetation type | Lake |
| Dominant Species (Overstory) | - |
| Dominant Species (Understory) | - |
| Canopy height | - |
| Age | - |
| LAI | - |
| Soil type | - |
Observation
Eddy Covariance method (CO2)
| System | Open-path systems (sensible heat, latent heat, CO2 flux) |
|---|---|
| Wind speed | Three-dimensional sonic anemothermometer (CSAT3, Campbell) |
| Air temperature | Three-dimensional sonic anemothermometer (CSAT3, Campbell) |
| Water vapor | Open-path CO2/H2O analyzers (EC150, Campbell) |
| CO2 | Open-path CO2/H2O analyzers (EC150, Campbell) |
| Measurement height | Approx.3m depending on the water level |
| Sampling frequency | 10 Hz |
| Averaging time | 30 min |
| Data logger | CR3000 (Campbell) |
| Data storage | CF card |
| Original data | Statistics |
Meteorology
| Observation items | Levels/Depth | Instrument |
|---|---|---|
| Global solar radiation (incoming) | 2.7 m | CNR4 (Kipp & Zonen) |
| Global solar radiation (outgoing) | 2.7 m | CNR4 (Kipp & Zonen) |
| Long-wave radiation (incoming) | 2.7 m | CNR4 (Kipp & Zonen) |
| Long-wave radiation (outgoing) | 2.7 m | CNR4 (Kipp & Zonen) |
| Net radiation | - | |
| PPFD (incoming) | - | |
| PPFD (outgoing) | - | |
| Direct / diffuse radiation | - | |
| Direct / diffuse PPFD | - | |
| Air temperature | 3.2 m | HMP60/HMP155 (Vaisala) |
| Humidity | 3.2 m | HMP60/HMP155 (Vaisala) |
| Soil temperature | -0.25, -0.5, -1.0, -1.5, -1.8 m | 107 (Campbell) |
| Soil heat flux | - | |
| Soil water content | - | |
| Wind speed | 3.2 m | |
| Wind direction | 3.2 m | |
| Barometric pressure | 1.9 m | CS106 (Campbell) |
| Precipitation | - | |
| CO2 concentration | 3.2 m | EC150 (Campbell) |
Fluxes of non-CO2 gases
| Gas | Methane |
| Method | Open-path eddy covariance method |
| Measurement height | Approx. 3 m depending on the water level |
| Data logger | CR3000 (Campbell) |
| Data storage | CF card |
Observation Period and Data Availability
| Measurement Period | April 2015 to present |
|---|---|
| Measurement Frequency | Continuous |
| Data Availability | 2015-2018 in AsiaFlux Database |
Contact
Hiroki Iwata (hiwata [at] shinshu-u.ac.jp)
Department of Environmental Science, Faculty of Science,
Shinshu University
3-1-1 Asahi, Matsumoto, Nagano 390-8621 JAPAN
Tel : +81-263-37-2502
Infrastructure
Mast, Electrical power(AC)
Calibration Information
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