Abstract
A new age for passive remote sensing of atmospheric trace constituents began with the launch of the nadir viewing spectrometers, GOME on ESA ERS-2 (1995-2011)) and SCIAMACHY on ESA Envisat (2002-2012)). Spectrometers, having improving spatial resolution and signal to noise have followed: the most recent being TROPOMI, on the Copernicus Sentinel-5 Precursor, EU-ESA-S5P (2017 to present). In addition, the Geostationary Environment Monitoring Spectrometer, GEMS, on the Korean Aerospace Research Institute GEO-KOMPSAT-2B satellite was launched in 2020. The aircraft family of instruments called AIRMAP and MAMAP family has been developed at the University of Bremen to measure in the ultraviolet/visible and the near-infrared/shortwave-infrared and are used to determine high spatial resolution trace column amounts. Using differential optical absorption spectroscopy, DOAS, total column amounts of key trace gases (e.g. ozone, O3, nitrogen dioxide, NO2, bromine monoxide, BrO, chlorine dioxide OClO, iodine oxide, IO, formaldehyde, HCHO, glyoxal, CHO.CHO, and water vapour H2O) are retrieved from the measurements in the UV and visible ranges. In the near and shortwave infrared. CO columns and the dry columns of methane, XCH4, and carbon dioxide, XCO2, are retrieved. This presentation focuses on recent results addressing: i) the validation of TROPOMI and the estimation of urban emissions of NO2; ii) ozone measurements; iii) the validation of the GEMS data products; iii) the emissions of CH4 from TROPOMI and CH4 and CO2 from the new MAMAP 2D Light instrument. The contributions will be discussed in the context of the evolving global observing system.
