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Using a Google Street View (GSV) car equipped with a high-precision methane analyzer, we adopted a mobile sensing approach to measure methane mixing ratios along public roads that are downwind of the ammonia fertilizer plants. pipeline leaks) in metropolitan areas, which is dominated by local distribution and residential/commercial use of NG ().Useful data were collected from six plants, which represent 20% of the total NG consumption by this industry. In contrast, methane emissions from industrial consumers of NG are largely unexplored.
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.A portable 3-D sonic anemometer (Model 81000 from R. Young Co., Traverse City, MI, USA) was installed near each visited fertilizer plants in a relatively flat and open location to measure local meteorological conditions (Table ).Local emissions, such as small pipeline leaks, can be identified as small spikes in the data (Figure ).
In the data post-processing, elevated mixing ratios due to local emissions were excluded from the analysis, and we focused on the broad plumes.
The background methane mixing ratio (An example of downwind methane plume measurement.