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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2018-21
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-21
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Apr 2018

13 Apr 2018

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This preprint was under review for the journal AMT but the revision was not accepted.

IASI nitrous oxide (N2O) retrievals: validation and application to transport studies at daily time scales

Yannick Kangah1, Philippe Ricaud1, Jean-Luc Attié2, Naoko Saitoh3, Jérôme Vidot4, Pascal Brunel4, and Samuel Quesada-Ruiz1 Yannick Kangah et al.
  • 1CNRM-GAME, Météo-France/CNRS UMR 3589, Toulouse, France
  • 2Université de Toulouse, Laboratoire d’Aérologie, CNRS UMR 5560, Toulouse, France
  • 3Center for Environmental Remote Sensing, Chiba University, Japan
  • 4Centre de Météorologie Spatiale,DP/Météo-France, Lannion, France

Abstract. The aim of this paper is to present a method to retrieve nitrous oxide (N2O) vertical profiles from the Infrared Atmospheric Sounding Interferometer (IASI) onboard the MetOp platform. We retrieved N2O profiles using IASI clear sky radiances in 2 spectral bands: B1 and B2 centered at ∼ 1280 cm−1 and ∼ 2220 cm−1, respectively. Both retrievals in B1 and B2 (hereafter referred to as N2O_B1 and N2O_B2, respectively) are sensitive to the mid-to-upper troposphere with a maximum of sensitivity at around 309 hPa. The degrees of freedom for N2O_B1 and N2O_B2 are 1.38 and 0.93, respectively. We validated the retrievals using the High-performance Instrumented Airborne Platform for Environmental Research Pole-to-Pole Observations (HIPPO). The comparisons between HIPPO and the two retrieved datasets show relatively low standard deviation errors around 1.5 % (∼ 4.8 ppbv) and 1.0 % (∼ 3.2 ppbv) for N2O_B1 and N2O_B2, respectively. However, the impact of H2O contamination on N2O_B1 due to its strong absorption bands in B1 significantly degrades the quality of the retrievals in tropical regions. We analysed the scientific consistency of the retrievals at 309 hPa with a focus on the long-range transport of N2O especially during the Asian summer monsoon. Over the mid-latitude regions, both variations of N2O_B1 and N2O_B2 at 309 hPa are influenced by the stratospheric N2O-depleted air because of the relative coarse shape of the averaging kernel. The analysis of N2O_B2 using results from backtrajectories exhibits the capacity of these retrievals to capture long-range transport of air masses from Asia to northern Africa via the summer monsoon anticyclone on a daily basis. Thus, N2O_B1 and N2O_B2 offer an unprecedented possibility to study global upper tropospheric N2O on a daily basis.

Yannick Kangah et al.

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Yannick Kangah et al.

Yannick Kangah et al.

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