Abstract
The imaging instruments on the polar-orbiting S-NPP and NOAA-20 satellite platforms [e.g., Visible Infrared Imaging Radiometer Suite (VIIRS)] and on geostationary GOES and Himawari platforms [e.g., Advanced Baseline Imager (ABI) and Advanced Himawari Imager (AHI)] have high horizontal spatial resolution but coarse vertical information about tropospheric gases and temperatures. An approach for fusing a high spatial resolution imager (e.g., VIIRS, ABI, and AHI) and a high information content sounder or trace gas monitor [e.g., Cross-track Infrared Sounder (CrIS) and TROPOspheric Monitoring Instrument (TROPOMI)] offers the opportunity to construct retrieval products (e.g., trace gas concentrations of CO, SO2, and NH3) via product fusion at high spatial resolution. Furthermore, these products can also be provided at high temporal resolution when geostationary imager (ABI and AHI) data are used in the product fusion. Promising results from VIIRS/CrIS, VIIRS/TROPOMI, and AHI/TROPOMI fusion are presented.
Highlights
Synergistic use of high spatial resolution imager data with trace gas information provides advantages in various applications over use of individual data sets alone
Specific focus is put on the synergy of geostationary orbit (GEO) and low Earth orbit (LEO) observations [e.g., Advanced Himawari Imager (AHI) and TROPOspheric Monitoring Instrument (TROPOMI)] since it allows the tracking of the trace gases during high-emission events in time sequences of the fused products
How far in time this process can be applied reliably depends on the synoptic situation, but we find that within three hours of LEO overpass time GEO/LEO fusion results are useful in most situations.[10]
Summary
Synergistic use of high spatial resolution imager data with trace gas information provides advantages in various applications over use of individual data sets alone. We follow a similar fusion approach to infer trace gas information from sounders or monitoring sensors at imager high spatial resolution (750 m to 2 km). Specific focus is put on the synergy of GEO and LEO observations [e.g., Advanced Himawari Imager (AHI) and TROPOMI] since it allows the tracking of the trace gases during high-emission events (e.g., volcanic eruption or industrial pollution) in time sequences of the fused products. These new products are shown to significantly enhance information that can be used in nowcasting, warning, and decision-making operations.
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