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https://doi.org/10.5194/acp-2020-347
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-347
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  04 Aug 2020

04 Aug 2020

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This preprint is currently under review for the journal ACP.

A nitric acid dataset from IASI for polar stratospheric denitrification studies

Gaetane Ronsmans1, Catherine Wespes1, Lieven Clarisse1, Susan Solomon2, Daniel Hurtmans1, Cathy Clerbaux1,3, and Pierre-François Coheur1 Gaetane Ronsmans et al.
  • 1Université libre de Bruxelles (ULB), Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), Brussels, Belgium
  • 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
  • 3LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France

Abstract. In this paper, we exploit the first 10-year data-record (2008–2017) of nitric acid (HNO3) total columns measured by the IASI-A/Metop infrared sounder, characterized by an exceptional daily sampling and a good vertical sensitivity in the mid-stratosphere (around 50 hPa), to monitor the causal relationship between the temperature decrease and the observed HNO3 loss that occurs each year in the Antarctic stratosphere during the polar night. Since the HNdepletion results from the formation of polar stratospheric clouds (PSCs) which trigger the development of the ozone (O3) hole, its continuous monitoring is of high importance. We verify here, from the 10-year time evolution of the pair HNO3-temperature (taken from reanalysis at 50 hPa), the recurrence of specific regimes in the cycle of IASI HNO3 and identify, for each year, the day and the 50 hPa-temperature (drop temperature) corresponding to the onset of denitrification in Antarctic winter. Although the measured HNO3 total column does not allow differentiating the uptake of HNO3 by different types of PSC particles along the vertical profile, an average drop temperature of ∼ 191 ± 3 K, consistent with the nitric acid trihydrate (NAT) formation temperature (close to 195 K at 50 hPa), is found. The spatial distribution and inter-annual variability of the drop temperature are briefly investigated and discussed in the context of previous PSCs studies. This paper highlights the capability of the IASI sounder to monitor the long-term evolution of the polar stratospheric composition and processes involved in the depletion of stratospheric O3.

Gaetane Ronsmans et al.

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Gaetane Ronsmans et al.

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The first 10-year data-record (2008–2017) of HNO3 total columns measured by the IASI-A/Metop infrared sounder, is exploited to monitor the relationship between the temperature decrease and the HNO3 loss observed each year in the Antarctic stratosphere during the polar night. We verify the recurrence of specific regimes in the cycle of IASI HNO3 and identify, for each year, the day and the 50 hPa-temperature (drop temperature) corresponding to the onset of denitrification in Antarctic winter.
The first 10-year data-record (2008–2017) of HNO3 total columns measured by the IASI-A/Metop...
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