1. Carbon Cycle Observation Advances at NCAR
Measurements:
Airborne Carbon in the Mountains Experiment (ACME ’04)
NACP Mid-continent Intensive (ACME-MINT ’07)
Regional Atmospheric Continuous CO2 Network (RACCOON)
HIAPER Pole-to-Pole Observations (HIPPO ’08)
Instrument Developments:
Autonomous Inexpensive Robust CO2 Analyzer (AIRCOA)
Difference Frequency Generation 13C Instrument
Community Airborne Oxygen Instrument
Britton Stephens, EOL and TIIMES

2. Background CO2 measurements define global trends and loosely constrain continental-scale fluxes
TransCom 3 Study Fluxes 2 1 -1 -2 60 30
-30
-60
Expected from fossil
fuel emissions
Billion $
Pg C / yr

3. Regional Atmospheric Continuous CO2 Network in the Rocky Mountains (Rocky RACCOON)
Autonomous, Inexpensive, Robust CO2 Analyzer (AIRCOA)
Existing () and Planned (O) Sites
Potential Future Sites (O)

4. HIAPER Pole-to-Pole Observations of Atmospheric Tracers
HIPPO ’08 (PIs: Harvard, NCAR, Scripps, and NOAA): A global and seasonal survey of CO2, O2, CH4, CO, N2O, H2, SF6, COS, CFCs, HCFCs, O3, H2O, and hydrocarbons
NCAR Community Airborne Oxygen Instrument
4 s precision equivalent to detecting removal of 1 O2 molecule from 2.5 million molecules of air