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Otherwise, the analysis is derived from first-principles (cell dimensions, pressure, temperature, and methane’s per-molar absorptivity) ().
Together, these concentration measures yield methane values that are accurate to better than 60 ppb (Robert Provencal, LGR, personal communication, 04/16/2019), which is relatively small considering that our methane data vary from ~2.0 ppm (ambient level) to ~30 ppm (peak mole fraction).
The background methane mixing ratio (An example of downwind methane plume measurement.
A Google Earth representation of an example of methane mixing ratios (red bars) measured by the GSV car along its pass around the ammonia fertilizer plant located in Fort Dodge, IA.
ammonia fertilizer industry using a mobile sensing approach. Leakage of NG can happen anywhere along the value chain from production to end-use, reducing its potential short- to medium-term GHG advantage over competing fossil fuels.Real-time location of the GSV car was determined by a roof-mounted GPS unit (Model A100 from Hemispheres GNSS, Scottsdale, AZ, USA) with an acquisition frequency of 1 Hz.