How do mineral dust aerosols impact N2O retrievals from IASI?
Sophie Vandenbussche, Royal Belgian Institute for Space Aeronomy, sophie.vandenbussche@aeronomie.be (Presenter)
Corinne Vigouroux, Royal Belgian Institute for Space Aeronomy, corinne.vigouroux@aeronomie.be
Bavo Langerock, Royal Belgian Institute for Space Aeronomy, bavo.langerock@aeronomie.be
Martine De Mazière, Royal Belgian Institute for Space Aeronomy, martine@oma.be
N2O is the third anthropogenic greenhouse gas, after CO2 and CH4. N2O is about a 1000 times less abundant than CO2, but is a much stronger greenhouse gas (265 times stronger, for the same amount of gas). N2O has an atmospheric lifetime of about 120 years, and resides mostly in the troposphere and lower stratosphere. N2O is also the principal source of nitrogen in the stratosphere, participating in the ozone destruction.
Although N2O emissions are mostly natural as a part of biogeochemical cycles, a significant part of the emissions is anthropogenic, linked to agriculture, industry and transport. The N2O concentrations are continuously increasing since the industrial era. Because its greenhouse potential is very high, identifying and regulating the anthropogenic N2O emissions is crucial for climate change mitigation.
The Infrared Atmospheric Sounding Interferometer (IASI) is a nadir viewing satellite instrument, measuring the outgoing radiation in the Infrared range. It flies on board the Metop satellite series, on a polar sun-synchronous orbit, and has been providing data since 2006 with a succession of 3 instruments. The follow-up instrument, IASI-NG (new generation), is already in preparation and will not only ensure data continuity for at least an additional decade, but it will also provide improved performances.
In this work, we present N2O profiles with a limited resolution of maximum 2 degrees of freedom, and the corresponding integrated columns, retrieved from IASI measurements using a Tikhonov-based retrieval strategy. We then analyse the impact of the presence of mineral dust aerosols on the quality of those retrievals, using our Mineral Aerosol Profiling from Infrared Radiances (MAPIR) data set. We assess the quality of our N2O data through comparisons with Network for the Detection of Atmospheric Composition Change (NDACC) and Total Carbon Column Observing Network (TCCON) measurements.
Poster: Poster_Vandenbussche__83_25.pdf
Presentation Type: Poster
Session: 2.2a Retrieval algorithms and methods for inter-instrument and product Cal/Val
Session Date: Tuesday (6/15) 9:45 AM