Observations of ozone production in a dissipating tropical convective cell during TC4

Morris, Gary A.; Thompson, A. M.; Pickering, Kenneth; Chen, S.; Bucsela, E. J.; Kucera, Paul A.

doi:10.5194/acp-10-11189-2010

Cited by 14 publications

(18 citation statements)

References 81 publications

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“…Even though the ozone growth is relatively slow (+1.2 ppbv h −1 ), it occurs at high altitude (2400-2500 m) in the free troposphere. Prior to our study, Morris et al (2010) reported ozone production in a free tropospheric air mass downwind of a tropical convective cell, also measured by an ozonesonde. In this case, however, the air mass tracking was not intentional and resulted by chance from vertical oscillations of a conventional sounding balloon in up-and downdraughts.…”

Section: Blpbs At Ceilingmentioning

confidence: 99%

Adapted ECC ozonesonde for long-duration flights aboard boundary-layer pressurised balloons

et al. 2016

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Abstract. Since the 1970s, the French space agency CNES has developed boundary-layer pressurised balloons (BLPBs) with the capability to transport lightweight scientific payloads at isopycnic level and offer a quasi-Lagrangian sampling of the lower atmosphere over very long distances and durations (up to several weeks).Electrochemical concentration cell (ECC) ozonesondes are widely used under small sounding balloons. However, their autonomy is limited to a few hours owing to power consumption and electrolyte evaporation. An adaptation of the ECC sonde has been developed specifically for long-duration BLPB flights.Compared to conventional ECC sondes, the main feature is the possibility of programming periodic measurement sequences (with possible remote control during the flight). To increase the ozonesonde autonomy, the strategy has been adopted of short measurement sequences (2-3 min) regularly spaced in time (e.g. every 15 min). The rest of the time, the sonde pump is turned off.Results of preliminary ground-based tests are first presented. In particular, the sonde was able to provide correct ozone concentrations against a reference UV-absorption ozone analyser every 15 min for 4 days.Then we illustrate results from 16 BLBP flights launched over the western Mediterranean during three summer field campaigns of the ChArMEx project (http://charmex.lsce.ipsl. fr): TRAQA in 2012, and ADRIMED and SAFMED in 2013. BLPB drifting altitudes were in the range 0.25-3.2 km. The longest flight lasted more than 32 h and covered more than 1000 km. Satisfactory data were obtained when compared to independent ozone measurements close in space and time. The quasi-Lagrangian measurements allowed a first look at ozone diurnal evolution in the marine boundary layer as well as in the lower free troposphere. During some flight segments, there was indication of photochemical ozone production in the marine boundary layer or even in the free troposphere, at rates ranging from 1 to 2 ppbv h −1 , which is slower than previously found in the boundary layer over land in the same region.

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Section: Blpbs At Ceilingmentioning

confidence: 99%

Adapted ECC ozonesonde for long-duration flights aboard boundary-layer pressurised balloons

et al. 2016

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“…They might be linked to anthropogenic activities such as emissions in mega cities or biomass burning in combination with changes in meteorology or/and long range transport of the precursor emissions (Hilboll et al, 2013b;Wai et al, 2014;Giglio et al, 2013;Schneider et al, 2015;Cooper et al, 2014;Duncan et al, 2016;Hilboll et al, 2017). On the other hand, tropospheric O 3 decreases by ∼-3 DU decade for this decrease maybe changes in dynamical processes, changes in STE, convection, humidity or precipitation (Morris et al, 2010;Wai et al, 2014;Fontaine et al, 2011;Ebojie et al, 2016;Mieruch et al, 2014;Trenberth et al, 2005;Adler et al, 2003;Chen and Liu, 2016;IPCC, 2007). The biggest limitation interpreting the observed trends over the northern and southern tropical latitudes (>18 o N and S) is the low data sampling at these latitudes.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…As discussed earlier, water vapor in the troposphere consists of one of the most important sinks of tropospheric ozone (Jacob, 2000). An increase in 10 vertical convective patterns over the tropical oceans may result in lower ozone mixing ratios in the upper troposphere where the WFDOAS retrieval is more sensitive (Morris et al, 2010;Wai et al, 2014;Fontaine et al, 2011;Ziemke et al, 2008;ColdeweyEgbers et al, 2005). Several studies have shown that the total column of water vapour (TCWV) has increased over the tropics.…”

Section: Seasonal Tropospheric O 3 Trendsmentioning

confidence: 99%

“…Indian Ocean in autumn. The increased deep convection is associated with ozone loss due to convective outflow and increased cloudiness and humidity which contribute to photochemical O 3 loss (Morris et al, 2010;Wai et al, 2014). Fontaine et al (2011) showed that the location of OLR minima has been shifted northwards which can be associated with a shift on the ITCZ by 0.5 -0.8 o northwards.…”

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confidence: 99%

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Harmonisation and trends of 20-years tropical tropospheric ozone data

Leventidou¹,

Weber²,

Eichmann³

et al. 2017

Preprint

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Abstract. Using the convective clouds differential (CCD) method on total ozone and cloud data from three European satellite instruments GOME/ ERS-2 (1995ERS-2 ( -2003, SCIAMACHY/Envisat (2002, and GOME-2/MetOp-A (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015) it is possible to retrieve tropical tropospheric columns of ozone (TTCO) which are in good agreement with in-situ measurements. Finally, the datasets have been harmonised applying no correction to GOME data while GOME-2 has been corrected using for each grid-box the mean bias with respect SCIAMACHY for the years of common operation (2007)(2008)(2009)(2010)(2011)(2012). Depending on the choice of harmonisation, the magnitude, pattern, and uncertainty of the trend can strongly vary. The harmonisation represents an additional source of uncertainty in the merged dataset and derived trend estimates. For the preferred harmonised dataset,

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“…Mao et al, 2006;Palmer et al, 2013), and lightning can produce ozone both directly (Minschwaner et al, 2008) and via lightning-generated NOx (e.g. Morris et al, 2010;Cooper et al, 2006), so this assumption can be violated in certain circumstances. A number of studies have attempted to estimate, through several different methods, the accuracy of trajectories.…”

Section: Trajectory Mappingmentioning

confidence: 99%

A global tropospheric ozone climatology from trajectory-mapped ozone soundings

Liu

Tarasick

et al. 2013

Atmos. Chem. Phys.

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Abstract.A global three-dimensional (i.e. latitude, longitude, altitude) climatology of tropospheric ozone is derived from the ozone sounding record by trajectory mapping. Approximately 52 000 ozonesonde profiles from more than 100 stations worldwide since 1965 are used. The small number of stations results in a sparse geographical distribution. Here, forward and backward trajectory calculations are performed for each sounding to map ozone measurements to a number of other locations, and so to fill in the spatial domain. This is possible because the lifetime of ozone in the troposphere is of the order of weeks. This physically based interpolation method offers obvious advantages over typical statistical interpolation methods. The trajectory-mapped ozone values show reasonable agreement, where they overlap, to the actual soundings, and the patterns produced separately by forward and backward trajectory calculations are similar. Major regional features of the tropospheric ozone distribution are clearly evident in the global maps. An interpolation algorithm based on spherical functions is further used for smoothing and to fill in remaining data gaps. The resulting three-dimensional global tropospheric ozone climatology facilitates visualization and comparison of different years, decades, and seasons, and offers some intriguing insights into the global variation of tropospheric ozone. It will be useful for climate and air quality model initialization and validation, and as an a priori climatology for satellite data retrievals. Further division of the climatology into decadal and annual averages can provide a global view of tropospheric ozone changes, although uncertainties with regard to the performance of older sonde types, as well as more recent variations in operating procedures, need to be taken into account.

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Observations of ozone production in a dissipating tropical convective cell during TC4

Abstract: Abstract. From

Cited by 14 publications

References 81 publications

Adapted ECC ozonesonde for long-duration flights aboard boundary-layer pressurised balloons

Adapted ECC ozonesonde for long-duration flights aboard boundary-layer pressurised balloons

Harmonisation and trends of 20-years tropical tropospheric ozone data

A global tropospheric ozone climatology from trajectory-mapped ozone soundings

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