Pollution events over the East Mediterranean: Synergistic use of GOME, ground-based and sonde observations and models

Ladstätter-Weißenmayer, A.; Kanakidou, Maria; Meyer-Arnek, Julian; Dermitzaki, Eirini; Richter, Andreas; Vrekoussis, Mihalis; Wittrock, F.; Burrows, J. P.

doi:10.1016/j.atmosenv.2007.05.031

Cited by 31 publications

(15 citation statements)

References 41 publications

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“…The comparison between data from satellite and ground-based instruments is a necessity to validate the retrievals and to monitor the performance of the instruments Hocke et al, 2007;Nardi et al, 2008;Jégou et al, 2008). The suite of groundbased and satellite retrievals together with models furthermore provides a unique tool to study atmospheric events and to detect trends (Ladstätter-Weißenmayer et al, 2007;Steinbrecht et al, 2006;Steinbrecht et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

GOMOS ozone profile validation using ground-based and balloon sonde measurements

et al. 2010

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Abstract. The validation of ozone profiles retrieved by satellite instruments through comparison with data from groundbased instruments is important to monitor the evolution of the satellite instrument, to assist algorithm development and to allow multi-mission trend analyses.In this study we compare ozone profiles derived from GO-MOS night-time observations with measurements from lidar, microwave radiometer and balloon sonde. Collocated pairs are analysed for dependence on several geophysical and instrument observational parameters. Validation results are presented for the operational ESA level 2 data (GOMOS version 5.00) obtained during nearly seven years of observations and a comparison using a smaller dataset from the previous processor (version 4.02) is also included.The profiles obtained from dark limb measurements (solar zenith angle >107 • ) when the provided processing flag is properly considered match the ground-based measurements within ±2 percent over the altitude range 20 to 40 km. Outside this range, the pairs start to deviate more and there is a Correspondence to: J. A. E. van Gijsel

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Section: Discussionmentioning

confidence: 99%

GOMOS ozone profile validation using ground-based and balloon sonde measurements

et al. 2010

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“…The collocation of the south-eastern Europe/Balkan Peninsula high-pressure system and the Asian monsoon low-pressure regime to the east causes northerly circulation over the Aegean Sea that sheers to north-westerly over the eastern Mediterranean (Tyrlis et al, 2013;Anagnostopoulou et al, 2014). As a result, the EMME region is affected by near-surface transport of polluted air masses from various distance sources such as the Middle East, eastern and central Europe (Lelieveld et al, 2002;Gerasopoulos et al, 2005;Ladstätter-Weißenmayer et al, 2007;Kalabokas et al, 2008;Kanakidou et al, 2011). Kleanthous et al (2014) reported that long-range transport (LRT) has important impacts on the air quality over the island of Cyprus and it is directly linked to high O 3 levels.…”

Section: G K Georgiou Et Al: Summer Eastern Mediterranean Air Qualmentioning

confidence: 99%

Air quality modelling in the summer over the eastern Mediterranean using WRF-Chem: chemistry and aerosol mechanism intercomparison

et al. 2018

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Abstract. We employ the WRF-Chem model to study summertime air pollution, the intense photochemical activity and their impact on air quality over the eastern Mediterranean. We utilize three nested domains with horizontal resolutions of 80, 16 and 4 km, with the finest grid focusing on the island of Cyprus, where the CYPHEX campaign took place in July 2014. Anthropogenic emissions are based on the EDGAR HTAP global emission inventory, while dust and biogenic emissions are calculated online. Three simulations utilizing the CBMZ-MOSAIC, MOZART-MOSAIC, and RADM2-MADE/SORGAM gas-phase and aerosol mechanisms are performed. The results are compared with measurements from a dense observational network of 14 ground stations in Cyprus. The model simulates T 2 m , P surf , and WD 10 m accurately, with minor differences in WS 10 m between model and observations at coastal and mountainous stations attributed to limitations in the representation of the complex topography in the model. It is shown that the south-eastern part of Cyprus is mostly affected by emissions from within the island, under the dominant (60 %) westerly flow during summertime. Clean maritime air from the Mediterranean can reduce concentrations of local air pollutants over the region during westerlies. Ozone concentrations are overestimated by all three mechanisms (9 % ≤ NMB ≤ 23 %) with the smaller mean bias (4.25 ppbV) obtained by the RADM2-MADE/SORGAM mechanism. Differences in ozone concentrations can be attributed to the VOC treatment by the three mechanisms. The diurnal variability of pollution and ozone precursors is not captured (hourly correlation coefficients for O 3 ≤ 0.29). This might be attributed to the underestimation of NO x concentrations by local emissions by up to 50 %. For the fine particulate matter (PM 2.5 ), the lowest mean bias (9 µg m −3 ) is obtained with the RADM2-MADE/SORGAM mechanism, with overestimates in sulfate and ammonium aerosols. Overestimation of sulfate aerosols by this mechanism may be linked to the SO 2 oxidation in clouds. The MOSAIC aerosol mechanism overestimates PM 2.5 concentrations by up to 22 µg m −3 due to a more pronounced dust component compared to the other two mechanisms, mostly influenced by the dust inflow from the global model. We conclude that all three mechanisms are very sensitive to boundary conditions from the global model for both gas-phase and aerosol pollutants, in particular dust and ozone.

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“…These episodes are: (i) desert dust (e.g. Dayan et al, 1991;Moulin et al, 1997a;Tsidulko et al, 2002;Kubilay et al, 2003;Papayannis et al, 2005;Kalivitis et al, 2007;Toledano et al, 2007;Meloni et al, 2008), (ii) fine pollution aerosols (Kukkonen et al, 2005;Ladstätter-Weißenmayer et al, 2007;Sciare et al, 2008), (iii) forest fires Niemi et al, 2005;Pace et al, 2005), and (iv) sea-salt aerosols (Marenco et al, 2007). Nevertheless, most of these studies either focus on episodes of specific aerosol types or they refer to the local scale only.…”

Section: Introductionmentioning

confidence: 99%

Synoptic conditions favouring the occurrence of aerosol episodes over the broader Mediterranean basin

Gkikas

Houssos

Hatzianastassiou

et al. 2011

Quart J Royal Meteoro Soc

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Pollution events over the East Mediterranean: Synergistic use of GOME, ground-based and sonde observations and models

Cited by 31 publications

References 41 publications

GOMOS ozone profile validation using ground-based and balloon sonde measurements

GOMOS ozone profile validation using ground-based and balloon sonde measurements

Air quality modelling in the summer over the eastern Mediterranean using WRF-Chem: chemistry and aerosol mechanism intercomparison

Synoptic conditions favouring the occurrence of aerosol episodes over the broader Mediterranean basin

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