Field Evaluation of a Method for Estimating Gaseous Fluxes from Aera Sources211 Using Open-Path FTIR

摘要

The paper gives preliminary results from a field evaluation of a new approach for211u001equantifying gaseous fugitive emissions of area air pollution sources. The 211u001eapproach combines path-integrated concentration data acquired with any path-211u001eintegrated optical remote sensing (PI-CRS) technique and computed tomography (CT) 211u001etechnique. In this study, and open-path Fourier transform infrared (CP-FTIR) 211u001einstrument sampled path-integrated concentrations along five radial beam paths, 211u001ein a vertical plane downwind from the source. A meteorological station collected 211u001emeasurements of wind direction and speed. Nitrous oxide (N2O) was released from a 211u001econtrolled area source simulator. The innovative CT technique, which applies the 211u001esmooth basis function minimization method to the beam data in conjunction with 211u001emeasured wind data, was used to estimate the total flux from the simulated area 211u001esource. The new approach estimates agreed with the true emission rates in 211u001eunstable atmospheric conditions and consistently overestimated the true emission 211u001erate in neutral atmospheric conditions.