New insights on sources and distributions of reactive nitrogen revealed from the global monitoring of atmospheric ammonia

Abstract : NH3 and NOx account together for close to 90 % of the reactive nitrogen (Nr) input into the atmosphere. Emissions have been strongly increasing since preindustrial times, leading to a cascade of direct or indirect environmental impacts. While global satellite measurements of NO2 are available since two decades and have largely contributed to a better knowledge of anthropogenic pollution sources and of atmospheric transport and chemistry, this was not the case until recently for NH3. In this presentation we will shortly review the improved methodology for retrieving NH3 globally and daily from IASI observations and show first validation results. We will describe the first 6-years of global NH3 measurements from IASI and discuss the distributions with emphasis on NH3 source apportionment and the variability in concentrations on various spatial scales, both seasonal and interannual. We will further examine the complementarity of simultaneous NH3 and NO2 satellite measurements (from IASI and GOME-2), possibly complemented by those of nitric acid (HNO3), to bring additional insight into the partitioning of reactive nitrogen sources and their relations in atmospheric processes. The presentation will briefly expose current limitations in the monitoring of Nr species from satellites and perspectives for possible improvements.
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Submitted on : Tuesday, February 24, 2015 - 2:31:27 PM
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Pierre-Francois Coheur, Martin van Damme, Yasmine Ngadi, Simon Whitburn, Lieven Clarisse, et al.. New insights on sources and distributions of reactive nitrogen revealed from the global monitoring of atmospheric ammonia. EGU General Assembly 2014, Apr 2014, Vienna, Austria. pp.id.14249. ⟨hal-01119956⟩

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