Description and evaluation of a tropospheric ozone lidar implemented on an existing lidar in the southern subtropics

Baray, Jean-Luc; Leveau, Jean; Porteneuve, Jacques; Ancellet, Gérard; Keckhut, Philippe; Posny, Françoise; Baldy, S.

doi:10.1364/ao.38.006808

Cited by 25 publications

(31 citation statements)

References 41 publications

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“…The SSO geographical location is close to the dynamic barriers, and it is thus expected to show high TOC variability due to dynamic processes such as stratospheretroposphere exchanges and meridian exchanges between the stratospheric tropical reservoir and midlatitudes (Baray et al, 1999;Portafaix et al, 2003) or between the Antarctic ozone hole and midlatitudes (Kirchhoff et al, 1996).…”

Section: Climatology and Seasonal Toc Variationmentioning

confidence: 99%

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Measurements of the total ozone column using a Brewer spectrophotometer and TOMS and OMI satellite instruments over the Southern Space Observatory in Brazil

et al. 2017

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Abstract. This paper presents 23 years of quasi-continuous measurements of the total ozone column (TOC) over the Southern Space Observatory (SSO) in São Martinho da Serra, Brazil (29.26 • S, 53.48 • and 488 m altitude). The TOC was measured by a Brewer spectrometer, and the results are also compared to daily and monthly observations from the TOMS (Total Ozone Mapping Spectrometer) and OMI (Ozone Monitoring Instrument) satellite instruments. Analyses of the main interannual modes of variability computed using the wavelet transform method were performed. A favorable agreement between the Brewer spectrophotometer and satellite datasets was found. The seasonal TOC variation is dominated by an annual cycle, with a minimum of approximately 260 DU in April and a maximum of approximately 295 DU in September. The wavelet analysis applied in the SSO TOC anomaly time series revealed that the Quasi-Biennial Oscillation (QBO) modulation was the main mode of interannual variability. The comparison between the SSO TOC anomaly time series with the QBO index revealed that the two are in opposite phases.

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Section: Climatology and Seasonal Toc Variationmentioning

confidence: 99%

“…Additional techniques such as Fourier transform infrared spectroscopy (FTIR) (Hase et al, 1999), Lidar (Baray et al, 1999), and radiosonde (Thompson et al, 2003) measurements have complemented the continuous record.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the total ozone column using a Brewer spectrophotometer and TOMS and OMI satellite instruments over the Southern Space Observatory in Brazil

et al. 2017

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“…1 and Table 1) since 1992 (in the framework of the Network for the Detection of Atmospheric Composition Change, NDACC, since 1996 and of the Southern Hemisphere ADditionnal OZone sondes, SHADOZ, network since 1998) and by lidar at the Université de la Réunion campus site (see Fig. 1 and Table 1) since 1998 (Baray et al, 1999.…”

Section: Introductionmentioning

confidence: 99%

“…-and the LIO3T lidar (Baray et al, 1999Clain et al, 2009Vérèmes et al, 2016), dedicated to the observation of tropospheric O 3 (as well as aerosols from the free troposphere up to the lower stratosphere).…”

Section: Introductionmentioning

confidence: 99%

Tropospheric ozone profiles by DIAL at Maïdo Observatory (Reunion Island): system description, instrumental performance and result comparison with ozone external data set

et al. 2017

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Abstract. In order to recognize the importance of ozone (O 3 ) in the troposphere and lower stratosphere in the tropics, a DIAL (differential absorption lidar) tropospheric O 3 lidar system (LIO3T UR ) was developed and installed at the Université de la Réunion campus site (close to the sea) on Reunion Island (southern tropics) in 1998. From 1998 to 2010, it acquired 427 O 3 profiles from the low to the upper troposphere and has been central to several studies. In 2012, the system was moved up to the new Maïdo Observatory facility (2160 m a.m.s.l. -metres above mean sea level) where it started operation in February 2013. The current system (LIO3T) configuration generates a 266 nm beam obtained with the fourth harmonic of a Nd:YAG laser sent into a Raman cell filled up with deuterium (using helium as buffer gas), generating the 289 and 316 nm beams to enable the use of the DIAL method for O 3 profile measurements. The optimal range for the actual system is 6-19 km a.m.s.l., depending on the instrumental and atmospheric conditions. For a 1 h integration time, vertical resolution varies from 0.7 km at 6 km a.m.s.l. to 1.3 km at 19 km a.m.s.l., and mean uncertainty within the 6-19 km range is between 6 and 13 %.

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“…The signal processing electronic chain and data processing are similar to those used at the Observatoire de Haute Provence ozone lidar station (Ancellet et al, 1991). Technical details of the system and validation measurements (comparisons with electrochemical concentration cell ozone soundings) are given in Baray et al (1999).…”

Section: Datamentioning

confidence: 99%

Investigation of the short-time variability of tropical tropospheric ozone

et al. 2003

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Abstract. Since 1998, a ground-based tropospheric ozone lidar has been running at Reunion Island and has been involved with a daily measurement campaign that was performed in the latter part of the biomass burning season, during November-December 1999. The averaged ozone profile obtained during November-December 1999 agrees well with the averaged ozone profile obtained from the ozonesondes launch at Reunion during November-December (1992. Comparing weekly sonde launches (part of the Southern Hemisphere Additional Ozonesondes: SHADOZ program) with the daily ground-based lidar observations shows that some striking features of the day-to-day variability profiles are not observed in the sonde measurements. Ozone profiles respond to the nature of disturbances which vary from one day to the next.The vertical ozone distribution at Reunion is examined as a function of prevailing atmospheric circulation. Back trajectories show that most of the enhanced ozone crossed over biomass burning and convectively active regions in Madagascar and the southern African continent. The analyses of the meteorological data show that ozone stratification profiles are in agreement with the movement of the synoptic situations in November-December 1999. Three different sequences of transport are explained using wind fields. The first sequence from 23 to 25 November is characterized by northerly transport; during the second sequence from 26 to 30 November, the air masses are influenced by meridional transport. The third sequence from 2 to 6 December is characterized by westerly transport associated with the subtropical jet stream. The large, standard deviations of lidar profiles in the middle and upper troposphere are in agreement with the upper wind variabilities which evidence passing ridge and trough disturbances. During the transition period between the dry season and the wet season, multiple ozone sources including stratosphere-troposphere exchanges, convection and biomass burning contribute to troCorrespondence to: T. Randriambelo (randriam@univ-reunion.fr) pospheric ozone at Reunion Island through sporadic events characterized by a large spatial and temporal variability.

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Description and evaluation of a tropospheric ozone lidar implemented on an existing lidar in the southern subtropics

Cited by 25 publications

References 41 publications

Measurements of the total ozone column using a Brewer spectrophotometer and TOMS and OMI satellite instruments over the Southern Space Observatory in Brazil

Measurements of the total ozone column using a Brewer spectrophotometer and TOMS and OMI satellite instruments over the Southern Space Observatory in Brazil

Tropospheric ozone profiles by DIAL at Maïdo Observatory (Reunion Island): system description, instrumental performance and result comparison with ozone external data set

Investigation of the short-time variability of tropical tropospheric ozone

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