Anthropogenic emissions of reactive nitrogen species have significantly increased, largely because of discharges from livestock, agricultural intensification and fertilizer use. Reactive nitrogen affects air quality, sensitive natural ecosystems, and the carbon balance.
The proposed mission aims at providing high spatial resolution measurements (<1 km) of NH3. These data will complement future hyperspectral sounding missions, monitoring emissions over industrial, domestic, and agricultural hotspots. The mission is based on a compact hyperspectral imager in the Thermal Infrared spectral range, deployed on a small satellite platform. We report on the mission design and objectives and address the technical feasibility of retrieving NH3 with a small satellite.
In this study, space remote sensing data and crop specific information from the ESA-led AgriSAR 2009 campaign are
used for studying the profiles of C-band SAR backscatter signals and multispectral-based leaf area index (LAI) over the
growth period of canola, pea and wheat. In addition, the correlations between radar backscatter parameters and the crop
yields were analyzed, based on extracted statistics of temporal profiles. The results show that the HV backscatter and
LAI are correlated differently before and after LAI peak. In addition, the coefficient of determination between peakrelated
statistics from polarimetric indicator profiles and yield for pea fields can reach up to 0.68, and for canola and
wheat up to 0.47 and 0.5, respectively. HV backscatter and coherence between HH and VV are most.