C-23 Sherpa
Associated content: 

CARAFE Wavelet Flux Observations

Those fluxes

Carbon Airborne Flux Experiment

The NASA Goddard Greenhouse Gas suite measures CO2, CH4 and water vapor using two commercial analyzers (Los Gatos Research) modified for airborne operation. The principle of detection is infrared laser absorption spectroscopy combined with a multi-pass gas cell that gives an effective absorption path length of several kilometers and measurement precisions of < 0.5%. Both instruments are coupled to a central data acquisition system and are essentially autonomous.

The GHG package is also uniquely capable of directly measuring surface emission and uptake using the eddy covariance technique. This includes fluxes of CO2, CH4, and sensitble and latent heat.

Carbon dioxide (CO2) and methane (CH4) are potent greenhouse gases and the foremost drivers of man-made climate change. Fossil fuel combustion is the primary source of CO2, while CH4 is released during natural gas extraction (fracking), enteric fermentation (cow burps), and other anthropogenic and natural processes. Measurements of these gases help us to quantify and compare the strength of different sources and thus build more accurate emission inventories. They can also serve as tracers for source attribution of other trace species.

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Compact Airborne Formaldehyde Experiment

The NASA GSFC Compact Airborne Formaldehyde Experiment (CAFE) instrument measures formaldehyde (CH2O) on both pressurized and unpressurized (high-altitude) aircraft. Using non-resonant laser induced fluorescence (LIF), CAFE possesses the high sensitivity, fast time response, and dynamic range needed to observe CH2O throughout the troposphere and lower stratosphere.

Formaldehyde is produced via the oxidation of hydrocarbons, notably methane (a ubiquitous greenhouse gas) and isoprene (the primary hydrocarbon emitted by vegetation). Observations of CH2O can thus provide information on many atmospheric processes, including:
 - Convective transport of air from the surface to the upper troposphere
 - Emissions of reactive hydrocarbons from cities, forests, and fires
 - Atmospheric oxidizing capacity, which relates to formation of ozone and destruction of methane
In situ observations of CH2O are also crucial for validating retrievals from satellite instruments, such as OMI, TROPOMI, and TEMPO.

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DC-8 - AFRC, ER-2 - AFRC, C-23 Sherpa - WFF, HL5200 Hanseo University (NIER)
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C-23 with Rear Doors Open

C-23 with Cargo Ramp Down

C-23 Interior Looking Forward

C-23 Interior Looking Aft


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