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
|
Domestic species (Overstory)
| -
|
Dominant species (Understory)
| -
|
Canopy height
| -
|
| Age | -
|
| LAI | - |
Soil type
| -
|
ObservationsEddy Covariance method (CO
2)
| 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
| CSAT3 (Campbell)
|
Wind direction
| 3.2 m
| CSAT3 (Campbell)
|
Barometric pressure
| 1.9 m
| CS106 (Campbell)
|
| Precipitation | -
|
|
CO2 concentration
| 3.2 m
| EC150 (Campbell)
|
Fluxes of no-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
|
