Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 3
Articles | Volume 19, issue 3
https://doi.org/10.5194/amt-19-793-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-793-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 3
Research article
 | 
03 Feb 2026
Research article |  | 03 Feb 2026

Mapping stratospheric nitric acid (HNO3) patterns in the extratropics with nadir-viewing infrared sounders – a retrieval perspective

Nadia Smith, Michelle L. Santee, and Christopher D. Barnet

Data sets

Sounder SIPS Aqua AIRS IR + MW Level 2 CLIMCAPS retrieved atmospheric state V2.1 N. Smith https://doi.org/10.5067/J7GVFM11OGIX

Sounder SIPS Suomi NPP CrIMSS Level 2 CLIMCAPS Full Spectral Resolution retrieved atmospheric state V2.1 N. Smith https://doi.org/10.5067/SD6WORV4GX8P

Sounder SIPS JPSS-1 CrIMSS Level 2 CLIMCAPS retrieved atmospheric state V2.1 N. Smith https://doi.org/10.5067/5GHJWKUXQSP6

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Short summary
Once Aura is decommissioned, the multi-decadal microwave limb sounder (MLS) record of stratospheric HNO3 will end. This paper presents the retrieval of stratospheric HNO3 from nadir infrared sounders. We demonstrate the retrieval of stratospheric HNO3, independent of tropospheric signal and noise, that broadly reflects the variation captured by MLS. This novel retrieval approach improves upon the status quo and lays the foundation for validation studies and product roll-out in future.
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