TROPOMI based emission estimate for East Asia

Abstract:

Emission datasets of nitrogen oxides (NO_x) at high horizontal resolutions (e.g., 0.05°×0.05°) are crucial for understanding human influences at fine scales, air quality studies, and pollution control. Yet high-resolution emission data are often lacking or contain large uncertainties especially for the developing regions. Taking advantage of high-resolution distribution of NO₂ VCDs from TROPOMI instrument, we developed a computationally efficient method to inverting NO_x emissions at the 0.05°×0.05° resolution. The inversion accounts for the nonlinear effects of horizontal transport, chemical loss, and deposition while very few computing resources are needed . We construct a 2-dimensional Peking University High-resolution Lifetime-Emission-Transport (PHLET) model, its adjoint model (PHLET-A), and a Satellite Conversion Metrix approach to relate emissions, simulated NO₂, and satellite NO₂ data. The inversion method is applied to East Asia, using the POMINO NO₂ vertical column density product retrieved from the TROPOspheric Monitoring Instrument.