Preprints
https://doi.org/10.5194/amt-2021-116
https://doi.org/10.5194/amt-2021-116

  27 May 2021

27 May 2021

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

Differential absorption lidar for water vapor isotopologues in the 1.98 μm spectral region: sensitivity analysis with respect to regional atmospheric variability

Jonas Hamperl1, Clément Capitaine2, Jean-Baptiste Dherbecourt1, Myriam Raybaut1, Patrick Chazette3, Julien Totems3, Bruno Grouiez2, Laurence Régalia2, Rosa Santagata1, Corinne Evesque4, Jean-Michel Melkonian1, Antoine Godard1, Andrew Seidl5, Harald Sodemann5, and Cyrille Flamant6 Jonas Hamperl et al.
  • 1DPHY, ONERA, Université Paris Saclay, F-91123 Palaiseau, France
  • 2Groupe de Spectrométrie moléculaire et atmosphérique (GSMA) UMR 7331, URCA, France
  • 3Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR 1572, CEA-CNRS-UVSQ, Gif-sur-Yvette, France
  • 4Institut Pierre-Simon Laplace (IPSL), FR636, Guyancourt, France
  • 5Geophysical Institute, University of Bergen, and Bjerknes Centre for Climate Research, Bergen, Norway
  • 6Laboratoire Atmosphères Milieux et Observations Spatiales (LATMOS), UMR 8190, CNRS-SU-UVSQ, Paris, France

Abstract. Laser active remote sensing of tropospheric water vapor is a promising technology to complement passive observational means in order to enhance our understanding of processes governing the global hydrological cycle. In such context, we investigate the potential of monitoring both water vapor H216O and its isotopologue HD16O using a differential absorption lidar (DIAL) allowing for ground-based remote measurements at high spatio-temporal resolution (150 m and 10 min) in the lower troposphere. This paper presents a sensitivity analysis and an error budget for a DIAL system under development which will operate in the two-micron spectral region. This numerical study uses different atmospheric conditions ranging from tropical to polar latitudes with realistic aerosol loads. Our simulations show that the measurement of the main isotopologue H216O is possible over the first 1.5 km of atmosphere with a relative precision in the water vapor mixing ratio of < 1 % in a mid-latitude or tropical environment. For the measurement of HD16O mixing ratios under the same conditions, relative precision is shown to be of similar order, thus allowing for the retrieval of range-resolved isotopic ratios. We also show that expected precisions vary by an order of magnitude between tropical and polar conditions, the latter giving rise to reduced precision due to low water vapor content and low aerosol load. Such values have been obtained for a commercial InGaAs PIN photodiode, as well as temporal and line-of-sight resolutions of 10 min and 150 m, respectively. Additionally, using vertical isotopologue profiles derived from a previous field campaign, precision estimates for the HD16O isotopic abundance are provided.

Jonas Hamperl et al.

Status: open (until 22 Jul 2021)

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Jonas Hamperl et al.

Jonas Hamperl et al.

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Short summary
Laser active remote sensing of tropospheric water vapor is a promising technology to enhance our understanding of processes governing the global hydrological cycle. We investigate the potential of a ground-based lidar to monitor the main water vapor isotopes at high spatio-temporal resolution in the lower troposphere. Using a realistic end-to-end simulator, we show that high precision measurements can be achieved within a range of 1.5 km, in mid-latitude or tropical environments.