The ARM Carbon project team members are responsible for a suite of instrument systems that are listed below.
- Precision Gas System (PGS)
The precision gas system (PGS) makes high-accuracy, high-precision measurements of CO2 and CH4 mixing ratios at 2, 4, 25, and 60 m above the ground. PGS measurements are collected at the ARM Southern Great Plains Central Facility.
- Precision Gas System isotope analyzer (PGSISO)
The precision gas system isotope analyzer (PGSISO) makes high-accuracy, high-precision measurements of CO2, CO, CH4, N2O, and C13O2. PGSISO measurements are collected at the ARM Southern Great Plains Central Facility.
- Greenhouse gas monitor (AOSGHG)
The Greenhouse Gas Monitor (GHG) is part of the Aerosol Observing System (AOS) and makes high-accuracy, high-precision measurements of CO2 and CH4 mixing ratios at 10 m above the ground. Two GHG systems are currently deployed.
- Flask Samplers for Carbon Cycle gases and isotopes (FLASK)
The carbon flask collection system (FLASK) samples atmospheric carbon dioxide and other trace gases. It comprises a suitcase-mounted array of flasks, or Programmable Flask Package (PFP), and a compressor and power module, or Programmable Compressor Package (PCP), to do programmable time-interval or event-based sampling. The FLASK system is mounted on a Cessna 206 aircraft to take samples at 12 heights or positions.
- CO2 Flux Measurement System (CO2FLX)
The Southern Great Plains (SGP) Carbon Dioxide Flux (CO2FLX) measurement systems provide half-hour average fluxes of CO2, H2O (latent heat), sensible heat, and momentum. The systems use the eddy covariance technique, which computes the fluxes from the vertical wind speed in combination with the concentrations of CO2 and H2O, temperature, and horizontal wind speed, respectively. A 3D sonic anemometer obtains the wind components and the temperature, while an infrared gas analyzer measures CO2 and H2O. Ancillary measurements report half-hour averages of radiation, meteorological, and below ground measurements. This system is part of the AmeriFlux Network.
- AmeriFlux Measurement Component (AMC)
The Ameriflux Measurement Component system comprises 12 soil temperature and volumetric water content (VWC) reflectometers and a set of upwelling and downwelling photosynthetically active radiation (PAR) sensors, all deployed near a Eddy Correlation Flux Measurement System. Soil temperature and VWC sensors are placed at two depths (10 and 30 cm below the vegetation layer) at six locations or microsites allow soil property inhomogeneity to be monitored across a landscape. AMCs are currently deployed at three sites.
- Carbon Monoxide system
The Carbon Monoxide (CO) system, deployed at the Southern Great Plains megasite, measures the atmospheric concentration of CO mixing ratio (parts per billion by volume dry air) at 10-minute intervals 60 meters above ground level. Measurements are based on the principle that CO absorbs infrared radiation at a wavelength of 4.6 micrometers (µm).