CRK:Cheorwon Rice paddy

General site detail (Updated 22 May 2017)

Site name	Cheorwon Rice paddy
AsiaFlux site code	CRK
Location	Dongsong-eup, Cheorwon-gun, Gangwon-do,  Republic of Korea
Position	38° 12'5" N, 127° 15'2" E
Elevation	181 m a.s.l.
Slope	0°
Terrain type	Flat
Area	N/A
Fetch	N/A
Climate	Warm Continental Climate (Dwa)
Mean annual air temperature	10.2℃ (2011)
Mean annual precipitation	1394 mm (2011)
Vegetation type	Rice paddy
Domestic species (Overstory)	Oryza sativa
Dominant species (Understory)	N/A
Canopy height	~ 1m
Age	Annual Plant
LAI	~ 6 (±1), Max in August
Soil type	N/A

Observations
Eddy Covariance method (CO₂)

System	Enclosed (CO2 flux, latent heat flux) and Open path (CH4 flux)
Wind speed	3D sonic anemometer (CSAT3)
Sonic temperature	3D sonic anemometer (CSAT3)
Water vapor	Enclosed path infrared gas analyzer (LI7200)
CO2	Enclosed path infrared gas analyzer (LI7200)
Measurement height	10 m
Sampling frequency	10 Hz
Averaging time	30 min.
Data logger	CR3000 (Campbell Sci., USA),  Analyzer interface unit (LI-7550, Li-Cor)
Data storage	HD
Original data	Raw and statistics

Meteorology

Observation items	Levels / Depth	Instrument
Global solar radiation  (incoming)	10 m	Net radiometer  (CNR4, Kipp & Zonen, Netherlands)
Global solar radiation  (outgoing)	10 m	Net radiometer (CNR4)
Long-wave radiation  (incoming)	10 m	Net radiometer (CNR4)
Long-wave radiation  (outgoing)	10 m	Net radiometer (CNR4)
Net radiation	10 m	Net radiometer (CNR4)
Direct and diffuse PPFD	10 m	Quantum sensor  (PQS1 with rotating band, K&Z)
Air temperature	10 m	Temperature and RH probe  (HMP155, Vaisala, Finland)
Humidity	10 m	Temperature and RH probe (HMP155)
Soil temperature	0 ~ -0.1 m,  -0.1 ~ -0.2 m	Multiparameter smart sensor  (CS655, Campbell Sci., Inc., USA)
Soil heat flux	-0.1 m	Heat flux plate (HFP01, Hukseflux Thermal Sensors B.V., Netherlands)
Soil water content	0 ~ -0.1 m,  -0.1 ~ -0.2 m	Multiparameter smart sensor (CS655)
Wind speed	10 m	3D sonic anemometer (CSAT3, CSI)  Wind monitor (05103, R.M. Young Co., USA)
Wind direction	10 m	3D sonic anemometer (CSAT3)  Wind monitor (05103)
Barometric pressure	10 m	Enclosed path infrared gas analyzer  (LI7200, Li-Cor)
Precipitation	1 m	Tipping Bucket  (WDR-205, Wedaen Co., Korea)
Water temperature	Ground	Thermocouple probe (TCAV, CSI)
Water depth	Ground	Water level gauge (BYL-EV250, Korea)

Flux of non-CO₂ gases

Gas	CH4
Method	Open path CH4 analyzer (LI-7700, Li-Cor)
Measurement height	10 m
Data logger	Analyzer interface unit (LI-7550, Li-Cor)
Data storage	Raw data (and statistics)

Other

Photosynthesis	Portable chamber (LI6400, Li-Cor)
Canopy structure	Digital camera, LED sensor
Continuous spectral reflectance	Jaz spectrometer (Ocean optics, USA)
Sun-induced chlorophyll fluorescence	QEpro (Ocean optics, USA)

Observation Period and data Availability

Measurement Period	From May 2015 to present
Measurement Frequency	Continuous
Data Availability	N/A

Contact

Youngryel Ryu (yryu[at]snu.ac.kr)  Department of Landscape Architecture and Rural Systems Engineering,  Seoul National University  Bld.200/Rm.9217, Seoul National University, 1 Gwanak-ro, Gwanak-gu,  Seoul 08826, Korea  Phone: +82-2-880-4871   Fax: +82-2-873-5113  URL: http://environment.snu.ac.kr/

Joon Kim (joon[at]snu.ac.kr)  Department of Landscape Architecture and Rural Systems Engineering,  Seoul National University  Complex System Science Laboratory, Bld.36/Rm.108, Seoul National  University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea  Phone: +82-2-880-4663   Fax: +82-2-871-0230

Minseok Kang (mc-kang[at]ncam.kr)  National Center for AgroMeteorology  Bld.36/Rm.109, Seoul National University, 1 Gwanak-ro, Gwanak-gu,  Seoul 08826, Korea  Phone: +82-2-871-0232    Fax: +82-2-871-0230

Calibration Information

Infrared gas analyzer of EC system was calibrated approximately in  every 6 months with standard CO2 gases and a dew point generator  (LI610, Li-Cor).  Other micrometeorological instruments are being calibrated approx.  once in every 2 year.

Infrastructure

Tower, Electrical power (AC)

Research Fund

Korea Meteorological Administration Research and Development  Program under Weather Information Service Engine (WISE) project,  KMIPA-2012-0001-2  National Research Foundation of Korea (NRF-2016M1A3A3A02018195)  National Research Foundation of Korea (NRF-2015R1A2A1A16074924)

Publication

N/A