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List of Abstracts 171P-Observations 2.15 ID:4216 10:30Twenty years of tropospheric ozone variability measured at the Observatoire de Haute Provence from1990-2009Audrey Gaudel, Gérard Ancellet, Sophie GodinUPMC CNRS LATMOS Paris FranceContact: audrey.gaudel@latmos.ipsl.frUnderstanding of the tropospheric mid-latitude ozone trends in the free troposphere becomes again a criticalissue, as long range transport of continental emissions varying in opposite directions appears to control theozone variability and its role in the climate. The tropospheric ozone variability can be studied from verticalprofiles obtained using two types of instruments during the time period 1990-2009 at Observatoire de HauteProvence in Southern France (44N, 6E), balloon borne ozonesondes and a UV DIAL lidar providing data inthe altitude range 3-14 km.In our study, we have been doing calculations of the seasonal variation for 2 km layers in the troposphere (2-8 km) for four five years periods. Since it is done separetely for the lidar and sonde records, differences canbe discussed both in terms of instrument accuracy and of sampling bias due to different air mass histories.Sondes are launched every week on the same day, while lidar profiles are taken 1 or 2 times per week andfor low cloud coverage. The comparison is based on the shape of the seasonal variability and the absolutevalues of the seasonal averages, especially the spring or summer maximum. The shape of the seasonalvariability is similar but differences of the order of 3-5 ppb occurs in the seasonal averages with a systematicnegative bias for the lidar in 1996-1999 for all season.Differences related to sampling conditions are analyzed with 3-days three dimensional backward trajectoriescalculated for each vertical profile during twenty years. Four source regions are identified: [Europe(lat>45N)], [Eastern Mediterranean], [Spain/Africa/North America (lat40N)]. Thus, two criteria are discussed in this analysis : the fraction of profiles being above a givenregion during the last three days and the starting altitude of the trajectories. We did not find large differencesin the starting altitude, but more situations from the South-West region, sampled by the sounding balloonsafter 2000. Another way to perform this comparison is to calculate the frequency of the ozone layering in agiven profile. For the time period 1996-1999, it was found that more layering occurs for the lidar with anunusual seasonal variation (no summer peak). This points toward a peculiar lidar sampling in 1996-1999.The 20-years trend will be presented using all the lidar and sonde data. Considering that, we cannot identifya clear bias in a given direction due to instrumental effectP-Observations 2.16 ID:4225 10:30Is Europe getting cleaner? Analysis of European ozone trends 1995-2006Rebecca Wilson 1 , Stephan Henne 2 , Zoe Fleming 1 , Paul Monks 11 University of Leicester2 EmpaContact: rcw15@le.ac.ukThe GEOMON (Global Earth Observation and MONitoring) project has produced a harmonised dataset oftrace gases from ~400 ground-based measurement stations from a variety of regional, national and Europeanair quality networks (e.g. EMEP, GAW). Forty-one of these sites typically categorised as rural and/orbackground, with good ozone data coverage form 1995-2006, have been selected for analysis.iCACGP-IGAC 2010 14 July, 2010
List of Abstracts 172Customised tools have been developed in R to assess European trace gas trends. Long-term and seasonaltrends have been characterised at all sites using loess regression. Additionally, ozone was deseasonalised andlinear trends were quantified for monthly means, 5th and 95th percentiles (to illustrate changes in mean,background and peak concentrations respectively). Linear trends for seasonal ozone means were quantifiedin a similar manner.With the introduction of national and European legislation over the past 20 years, and the modernisation orremoval of industrial sources, European ozone precursor emissions have resulted in significant reductions inozone since the 1980's. However, between 1995-2006 analysis of ozone 5th and 95th percentiles(representing background and peak levels, respectively) show that the majority of sites in central andnorthwestern Europe have increased with a range of 0.11-0.67 ppbv/yr and 0.19-0.64 ppbv/yr, respectively(significance p
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List of Abstracts 27An inverse mode
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List of Abstracts 35Reductions in b
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List of Abstracts 39includes emissi
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List of Abstracts 45measurements an
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List of Abstracts 47Multiphase halo
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List of Abstracts 49be explained by
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List of Abstracts 51Contact: tzhu@p
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List of Abstracts 551 University of
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List of Abstracts 57Contact: visahi
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List of Abstracts 59Weather and cli
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List of Abstracts 61on the global M
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List of Abstracts 65P-Chemistry Cli
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List of Abstracts 69have included s
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List of Abstracts 71Contact: bumiya
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List of Abstracts 77of the rain bel
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List of Abstracts 79Community Atmos
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List of Abstracts 81climate conditi
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List of Abstracts 835 IMK, Karlsruh
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List of Abstracts 85P-Observations
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List of Abstracts 89We have previou
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List of Abstracts 91particles, from
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List of Abstracts 933 Department of
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List of Abstracts 95also from agric
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List of Abstracts 101(WMO, Geneva),
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List of Abstracts 103START-08 campa
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List of Abstracts 107Observations 2
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List of Abstracts 109Interfaces 1.1
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List of Abstracts 1111 Met Office H
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List of Abstracts 113year are almos
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List of Abstracts 117of carbon mono
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List of Abstracts 119Plenary 3 ID:4
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List of Abstracts 2213 Princeton Un
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List of Abstracts 223Robinson, A.L.
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List of Abstracts 225Observations 4
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List of Abstracts 227minor contribu
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List of Abstracts 233Wake-up 1.1 ID
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List of Authors 237Beck, Veronica .
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List of Authors 239Dann, Tom.......
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List of Authors 241Gioda, Adriana .
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List of Authors 249Shank, Lindsey .
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