Analysis of a rapid increase of stratospheric ozone during late austral summer 2008 over Kerguelen (49.4° S, 70.3° E)

Benchérif, Hassan; Amraoui, L. El; Kirgis, Guillaume; Bellevue, Jimmy Leclair de; Hauchecorne, Alain; Mzé, Nahoudha; Portafaix, Thierry; Pazmiño, Andréa; Goutail, Florence

doi:10.5194/acp-11-363-2011

Cited by 23 publications

(31 citation statements)

References 42 publications

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“…dynamic processes such as vertical and isentropic exchanges through the southern stratospheric dynamical barriers contribute to the transport and variability of ozone (Portafaix et al, 2003;El Amraoui et al, 2010;Bencherif et al, 2007Bencherif et al, , 2011. Moreover, latest reports on ozone assessment seem to fear a delay in the recovery of ozone in the tropics due to an acceleration of Brewer-Dobson circulation (WMO/UNEP, 2014).…”

Section: A M Toihir Et Al: Comparison Of Total Column Ozonementioning

confidence: 99%

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Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics

et al. 2015

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Abstract. This paper presents comparison results of the total column ozone (TCO) data product over 13 southern tropical and subtropical sites recorded from the Infrared Atmospheric Sounder Interferometer (IASI) onboard the EU-METSAT (European organization for the exploitation of METeorological SATellite) MetOp (Meteorological Operational satellite program) satellite. TCO monthly averages obtained from IASI between June 2008 and December 2012 are compared with collocated TCO measurements from the Ozone Monitoring Instrument (OMI) on the OMI/Aura satellite and the Dobson and SAOZ (Système d'Analyse par Observation Zénithale) ground-based instruments. The results show that IASI displays a positive bias with an average less than 2 % with respect to OMI and Dobson observations, but exhibits a negative bias compared to SAOZ over Bauru with a bias around 2.63 %. There is a good agreement between IASI and the other instruments, especially from 15 • S southward where a correlation coefficient higher than 0.87 is found. IASI exhibits a seasonal dependence, with an upward trend in autumn and a downward trend during spring, especially before September 2010. After September 2010, the autumn seasonal bias is considerably reduced due to changes made to the retrieval algorithm of the IASI level 2 (L2) product.The L2 product released after August (L2 O 3 version 5 (v5)) matches TCO from the other instruments better compared to version 4 (v4), which was released between June 2008 and August 2010. IASI bias error recorded from September 2010 is estimated to be at 1.5 % with respect to OMI and less than ±1 % with respect to the other groundbased instruments. Thus, the improvement made by O 3 L2 version 5 (v5) product compared with version 4 (v4), allows IASI TCO products to be used with confidence to study the distribution and interannual variability of total ozone in the southern tropics and subtropics.

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Section: A M Toihir Et Al: Comparison Of Total Column Ozonementioning

confidence: 99%

“…The precision of OMI-TOMS is evaluated at 3 %. For more information on the OMI instrument, the reader may refer to the OMI Algorithm Theoretical Basis Document Volume II (Bhartia, 2002).…”

Section: Omimentioning

confidence: 99%

Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics

et al. 2015

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“…There are several studies that have shown that the dynamics of the Southern Hemisphere polar vortex has an influence in the nearby surrounding structures (upper troposphere and stratosphere) of the Southern Hemisphere [27,28,29]. A useful method that can assist in profiling the isentropic transport across the dynamical barriers in the stratosphere is the MIMOSA (Modélisation Isentrope du transport Méso-échelle de l'Ozone Stratosphérique par Advection) model.…”

Section: Dynamical Context Using Mimosa Modelmentioning

confidence: 99%

Stratosphere–Troposphere Exchange and O<sub>3</sub> Decline in the Lower Stratosphere over Irene SHADOZ Site, South Africa

Mkololo¹,

Mbatha²,

Sivakumar³

et al. 2020

Preprint

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This study aims to investigate the Stratosphere-Troposphere Exchange (STE) events and ozone trends over Irene (25.5°S, 28.1°E). Twelve years of ozonesondes data (2000–2007, 2012–2015) from Irene station operating in the framework of the Southern Hemisphere Additional Ozonesodes (SHADOZ) was used to study the troposphere (0–16 km) and stratosphere (17– 28 km) ozone (O3) vertical profiles. Ozone profiles were grouped into three categories (2000–2003, 2004–2007 and 2012–2015) and average composites were calculated for each category. Fifteen O3 enhancement events were identified over the study period. These events were observed in all seasons (one event in summer, four events in autumn, five events in winter and five events in spring), however, they predominantly occur in winter and spring. The STE events presented here are observed to be influenced by the Southern Hemisphere polar vortex. During the STE events, the advected potential vorticity maps assimilated using Modélisation Isentrope du transport Méso–échelle de l’Ozone Stratosphérique par Advection (MIMOSA) model for the 350 K (~12–13 km) isentropic level indicated a transport of high latitude air masses which seems to be responsible for the reduction of the O3 mole fractions at the lower stratosphere over Irene which takes place at the same time with the enhancement of ozone in the upper troposphere. In general, the stratosphere is dominated by higher Modern Retrospective Analysis for Research Application (MERRA-2) potential vorticity (PV) values compared to the troposphere. However, during the STE events, higher PV values from the stratosphere were observed to intrude the troposphere. Ozone decline was observed from 12 km to 24 km with highest decline occurring from 14 km to 18 km. An average decrease of 6.0 and 9.1% was calculated from 12 to 24 km in 2004–2007 and 2012–2015 respectively. The observed decline occurred in the upper troposphere and lower stratosphere with winter and spring showing more decline compared with summer and autumn.

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“…Nevertheless, stratospheric ozone is predominantly determined by in situ creation (production), destruction (loss) and transport into or out of the region (Kirgis et al, 2013). But unlike in the UTLS where ozone concentration is largely affected by transport (Bencherif et al, 2007(Bencherif et al, , 2011El Amraoui et al, 2010), photochemical formation and destruction dominate the upper stratosphere, the region of pronounced manmade ozone-depleting substances (ODS) effects (UNEP United Nations Environment Programme, 1999). These ODSs have also contributed to the changes in global ozone levels where the upper stratospheric ozone decline has been more apparent from 1979 (Kirgis et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Spring Ozone's Connection to South Africa's Temperature and Rainfall

Manatsa

Mukwada

2019

Front. Earth Sci.

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The Brewer-Dobson circulation (BDC), whose dynamic activity is enhanced from winter to spring, transports stratospheric ozone from the tropical source regions to higher latitudes. But it is the BDC's shallow branch which transfers lower stratospheric ozone (LSO) from the tropics to the subtropics. Hence the accumulation of ozone in the subtropics is at its maximum at the end of spring (October) in the Southern Hemisphere (SH). Here we use observation and observation constrained reanalysis data to investigate the extent to which the interannual variability of this end of spring accumulated LSO is able to impact on the maximum surface air temperature (SATmax) and precipitation of South Africa. This is achieved through contrasting years of high positive and negative October ozone anomalies for the extreme BDC activity, referred to as weak (wBDC) and strong (sBDC) respectively. It is found that the w(s)BDC event composites coincide with significant negative (positive) SATmax anomalies and positive (negative) rainfall over South Africa. We suggest that the wBDC's related LSO surpluses trap the UVB meant to heat the troposphere and surface. This induces the observed negative middle to upper tropospheric air temperatures and geopotential heights resulting in cyclonic circulation anomalies that enhances rainfall and suppresses SATmax. The opposite is true for the sBDC composites where ultimately the elevated geopotential heights result in middle to upper anticyclonic tropospheric anomalies that are accompanied by rainfall deficits and increased SATmax.

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Analysis of a rapid increase of stratospheric ozone during late austral summer 2008 over Kerguelen (49.4° S, 70.3° E)

Cited by 23 publications

References 42 publications

Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics

Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics

Stratosphere–Troposphere Exchange and O<sub>3</sub> Decline in the Lower Stratosphere over Irene SHADOZ Site, South Africa

Spring Ozone's Connection to South Africa's Temperature and Rainfall

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Analysis of a rapid increase of stratospheric ozone during late austral summer 2008 over Kerguelen (49.4° S, 70.3° E)

Cited by 23 publications

References 42 publications

Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics

Comparison of total column ozone obtained by the IASI-MetOp satellite with ground-based and OMI satellite observations in the southern tropics and subtropics

Stratosphere&ndash;Troposphere Exchange and O<sub>3</sub> Decline in the Lower Stratosphere over Irene SHADOZ Site, South Africa

Spring Ozone's Connection to South Africa's Temperature and Rainfall

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Stratosphere–Troposphere Exchange and O<sub>3</sub> Decline in the Lower Stratosphere over Irene SHADOZ Site, South Africa