Nickolay A. Krotkov

TL;DR: The Ozone Monitoring Instrument (OMI) onboard NASA's Aura satellite has been providing global observations of the ozone layer and key atmospheric pollutant gases, such as nitrogen dioxide (NO2) and sulfur dioxide (SO2), since October 2004 as mentioned in this paper.

TL;DR: In this article, a comprehensive literature review and comprising input by both satellite experts and emission inventory specialists, the review identifies several targets that seem promising: large point sources of NOx and SO2, species that are difficult to measure by other means (NH3 and CH4, for example), area sources that cannot easily be quantified by traditional bottom-up methods (such as unconventional oil and gas extraction, shipping, biomass burning, and biogenic sources), and the temporal variation of emissions (seasonal, diurnal, episodic).

TL;DR: An OMI SO/sub 2/ algorithm (the band residual difference) that uses calibrated residuals at SO/ sub 2/ absorption band centers produced by the NASA operational ozone algorithm (OMTO3) is described, which permits daily global measurement of passive volcanic degassing of SO/ Sub 2/ and of heavy anthropogenic SO/Sub 2/ pollution to provide new information on the relative importance of these sources for climate studies.

TL;DR: Satellite observations are used to show that China and India are on opposite trajectories for sulfurous pollution, suggesting effective SO2 control in China and lack thereof in India.

TL;DR: In this article, a new algorithm for the retrieval of nitrogen dioxide (NO2) vertical columns from nadir-viewing satellite instruments is described, and the sensitivity of the retrieval to assumptions made in the stratosphere-troposphere separation is discussed and shown to be small, in an absolute sense, for most regions.