Preprints
https://doi.org/10.5194/amt-2021-119
https://doi.org/10.5194/amt-2021-119

  05 May 2021

05 May 2021

Review status: this preprint is currently under review for the journal AMT.

Tropospheric and stratospheric NO retrieved from ground-based FTIR measurements

Minqiang Zhou1, Bavo Langerock1, Corinne Vigouroux1, Bart Dils1, Christian Hermans1, Nicolas Kumps1, Jean-Marc Metzger3, Emmanuel Mahieu4, Pucai Wang2,5,6, and Martine De Mazière1 Minqiang Zhou et al.
  • 1Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
  • 2LAGEO & CNRC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 3UMS 3365 – OSU Réunion, Université de La Réunion, Saint-Denis, Réunion, France
  • 4Institut d’Astrophysique et de Géophysique, UR SPHERES, Université de Liège, Liège, Belgium
  • 5University of Chinese Academy of Sciences, Beijing, China
  • 6Xianghe Observatory of Whole Atmosphere, Institute of Atmospheric Physics, Chinese Academy of Sciences, Xianghe, China

Abstract. Nitric oxide (NO) is a key active trace gas in the atmosphere, which contributes to form “bad” ozone (O3) in the troposphere and to the destruction of “good” O3 in the stratosphere. In this study, we present the NO retrieval from ground-based Fourier-transform infrared (FTIR) solar absorption spectrometry measurements at a polluted site (Xianghe, China) and a background site (Maïdo, Reunion Island). The Degree Of Freedom (DOF) of the NO retrieval is 2.3 ± 0.4 (1σ) at Xianghe and 1.3 ± 0.1 at Maïdo.

The high NO mole fraction near the surface at Xianghe allows us to derive tropospheric and stratospheric NO partial columns separately, albeit the tropospheric column is almost not able to be retrieved in summer (June–August) because of the high water vapor abundance. At Maïdo, the NO retrieval is only sensitive to the stratosphere. The FTIR measurements at Maïdo show that the stratospheric NO partial column increases from the early morning to about 14:00 local time and starts decreasing thereafter. The stratospheric NO partial column is large in summer as compared to winter at both sites, and the seasonal variation of the FTIR stratospheric NO partial columns is consistent with that observed by the co-located Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) satellite measurements. We observe a good correlation between the carbon monoxide (CO) and NO daily partial columns in the troposphere observed by the FTIR measurements at Xianghe with a correlation coefficient of 0.70, because both species have similar anthropogenic sources.

Minqiang Zhou et al.

Status: open (until 30 Jun 2021)

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Minqiang Zhou et al.

Minqiang Zhou et al.

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Short summary
NO is a key active trace gas in the atmosphere, which affects the atmospheric environment and human health. In this study, we show that the tropospheric and stratospheric NO partial columns can be observed from the ground-based FTIR measurements at a polluted site (Xianghe, China), but only stratospheric NO partial columns can be observed at a background site (Maïdo, Reunion Island). The variations of the NO observed by the FTIR measurements at the two sites are analyzed and discussed.