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Preprints
https://doi.org/10.5194/essd-2020-81
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-81
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 May 2020

07 May 2020

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A revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

Ship-borne lidar measurements showing the progression of the tropical reservoir of volcanic aerosol after the June 1991 Pinatubo eruption

Juan-Carlos Antuña-Marrero1, Graham W. Mann2,3, Philippe Keckhut4, Sergey Avdyushin5,, Bruno Nardi6, and Larry W. Thomason7 Juan-Carlos Antuña-Marrero et al.
  • 1Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, 47002, España
  • 2School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
  • 3National Centre for Atmospheric Science (NCAS-Climate), University of Leeds, Leeds, UK
  • 4Laboratoire Atmosphères, Milieux, Observations Spatiales, Université de Versailles Saint-Quentin, Versailles, 78280, France
  • 5Fedorov Institute of Applied Geophysics, Moscow, Russia
  • 6Nardi Scientific, LLC, Denver, CO, USA
  • 7NASA Langley Research Center, Hampton, Virginia, USA
  • Deceased

Abstract. A key limitation of volcanic forcing datasets for the Pinatubo period, is the large uncertainty that remains with respect to the extent of the optical depth of the Pinatubo aerosol cloud in the first year after the eruption, the saturation of the SAGE-II instrument restricting it to only be able to measure the upper part of the aerosol cloud in the tropics. Here we report the recovery of stratospheric aerosol measurements from two ship-borne lidars, both of which measured the tropical reservoir of volcanic aerosol produced by the June 1991 Mount Pinatubo eruption. The lidars were on-board two Soviet vessels, each ship crossing the Atlantic, their measurement datasets providing unique observational transects of the Pinatubo cloud across the tropics from Europe to the Caribbean (~ 40° N to 8° N) from July to September 1991 (the Prof Zubov ship) and from Europe to south of the Equator (8° S to ~ 40° N) between January and February 1992 (the Prof Vize ship). Our philosophy with the data recovery is to follow the same algorithms and parameters appearing in the two peer-reviewed articles that presented these datasets in the same issue of GRL in 1993, and here we provide all 48 lidar soundings made from the Prof. Zubov, and 11 of the 20 conducted from the Prof. Vize, ensuring we have reproduced the aerosols backscatter and extinction values in the Figures of those two papers. These original approaches used thermodynamic properties from the CIRA-86 standard atmosphere to derive the molecular backscattering, vertically and temporally constant values applied for the aerosol backscatter to extinction ratio and the correction factor of the aerosols backscattering wavelength dependence. We demonstrate this initial validation of the recovered stratospheric aerosol extinction profiles, providing full details of each dataset in this paper's Supplement S1, the original text files of the backscatter ratio, the calculated aerosols backscatter and extinction profiles. We anticipate the data providing potential new observational case studies for modelling analyses, including a 1-week series of consecutive soundings (in September 1991) at the same location showing the progression of the entrainment of part of the Pinatubo plume into the upper troposphere and the formation of an associated cirrus cloud. The Zubov lidar dataset illustrates how the tropically confined Pinatubo aerosol cloud transformed from a highly heterogeneous vertical structure in August 1991, maximum aerosol extinction values around 19 km for the lower layer and 23–24 for the upper layer, to a more homogeneous and deeper reservoir of volcanic aerosol in September 1991. We encourage modelling groups to consider new analyses of the Pinatubo cloud, comparing to the recovered datasets, with the potential to increase our understanding of the evolution of the Pinatubo aerosol cloud and its effects. Data described in this work are available at https://doi.pangaea.de/10.1594/PANGAEA.912770 (Antuña-Marrero et al., 2020).

Juan-Carlos Antuña-Marrero et al.

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Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Juan-Carlos Antuña-Marrero et al.

Data sets

Ship borne lidar measurements in the Atlantic of the 1991 Mt Pinatubo eruption. J. C. Antuña-Marrero, G. W. Mann, P. Keckhut, S. Avdyushin, B. Nardi and and L. W. Thomason https://doi.pangaea.de/10.1594/PANGAEA.912770

Juan-Carlos Antuña-Marrero et al.

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Short summary
We report the recovery of lidar measurements of the 1991 Pinatubo eruption. Two Soviet ships crossing the tropical Atlantic in July–Sept. 1991 and Jan.–Feb. 1992 measured the vertical profile of the Pinatubo cloud at different points in its spatial and temporal evolution. The datasets provide valuable new information on the eruption’s impacts on climate, with the SAGE-II satellite measurements not able to measure most of the lower half of the Pinatubo cloud in the tropics in this period.
We report the recovery of lidar measurements of the 1991 Pinatubo eruption. Two Soviet ships...
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