Analysis of Mesoscale Patterns in Relation to Synoptic Conditionsover an Urban Mediterranean Basin

Kassomenos, Pavlos; Flocas, Helena A.; Lykoudis, S.; Petrakis, M.

doi:10.1007/s007040050025

Cited by 61 publications

(47 citation statements)

References 17 publications

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“…Open anti-cyclonic (OA) synoptic conditions frequently occur over Greece (38%yr −1 ), are usually clear and sunny and are characterized by relatively weak synoptic winds that favor development of sea-breeze circulation over the Athens basin during summer (Kassomenos et al, 1998;Melas et al, 1998;Ziomas et al, 1995). Thus, we focused on summer OA events.…”

Section: Meteorology and Episode Selectionmentioning

confidence: 99%

The role of sea-salt emissions and heterogeneous chemistry in the air quality of polluted coastal areas

et al. 2008

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Abstract. Open-ocean and surf-zone sea-salt aerosol (SSA) emission parameterizations are incorporated in the CAMx aerosol model and applied over an area with an extended Archipelago (Greece), with a fine grid nested over the highly populated Attica peninsula. The maximum indirect impact of SSA on PM 10 mass (35%) is located over a marine area with moderate SSA production and elevated shipping emissions (central Aegean Sea) where SSA interacts with anthropogenic nitric acid forming sodium nitrate. SSA increases PM 10 levels in the Athens city center up to 25% during stable onshore winds. Under such conditions both open-ocean and surf-zone mechanisms contribute to aerosol production over Attica. A hybrid scheme for gas-to-particle mass transfer is necessary for accurately simulating semi-volatile aerosol components when coarse SSA is included. Dynamically simulating mass transfer to the coarse particles leads to a quadrupling of predicted PM 10 nitrate in the Athens city center and up to two orders of magnitude in its coarse mass in comparison to using a bulk equilibrium approach.

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Section: Meteorology and Episode Selectionmentioning

confidence: 99%

The role of sea-salt emissions and heterogeneous chemistry in the air quality of polluted coastal areas

et al. 2008

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“…Lolis et al (2002) used a similar methodology and investigated the covariability between the lower troposphere and sea-surface temperatures (SST) in the Mediterranean. Kassomenos et al (1998) developed a manual classification based on 850 hPa weather map recognition. The procedure was applied locally (Attica Peninsula, central Greece) for a period of 16 years and distinguished eight synoptic categories.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis of the climate variability in the eastern Mediterranean. Part I: map‐pattern classification

Κωστοπούλου

Jones

2007

Intl Journal of Climatology

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Abstract:This paper provides an extended study of the dominant daily circulation patterns governing the climate variability in the eastern Mediterranean. The methodology adopted to determine the circulation patterns is based on combined analysis of the spatial and temporal variation of rotated principal components of sea-level pressure. A catalogue of characteristic seasonal composites is presented and discussed. It is found that, during winter and spring, large scale features situated in northern Europe affect the atmospheric circulation over the domain of study, whereas the Atlantic (Azores) anticyclone and the Asian Thermal Low define most of the observed circulation types in summer. In autumn, the area exhibits a rapid transition from the warm to cold season showing climatic features from both extreme seasons. Similarities between winter and spring/autumn patterns are detected and correlation analyses are employed between their spatial patterns to reveal that similar circulation patterns occur amongst the three seasons, which usually appear more pronounced during winter. Frequencies and trends of the proposed circulation types are examined for each season. A linear trend analysis for the overall period exhibits a significant increase in the anticyclonic types particularly in winter. With respect to the cyclonic types, statistically significant negative trends have been found in all seasons especially for types associated with depressional activity in central the Mediterranean.

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“…In general, these previous studies indicated that the main regions of cyclogenesis are primarily baroclinic zones. Katsoulis et al (1998) studied monthly anticyclonicity in southern Europe and the Mediterranean region and Kassomenos et al (1998) focused on the meso-scale patterns over the Mediterranean Basin. According to their findings the Mediterranean Basin and southern Europe are influenced during the year by semi-permanent large-scale anticyclones, the Azores anticyclone in the west and Eurasiatic (Siberian) anticyclone in the northwest.…”

Section: Introductionmentioning

confidence: 99%

Cyclone track variability over Turkey in association with regional climate

Karaca

Deniz

Tayanç³

2000

Int. J. Climatol.

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In this study a set of cyclone frequency statistics is developed and the prevailing tracks of cyclones are derived for a region of the world that has not been previously investigated in detail. Analysis reveals that Turkey experiences the effects of five dominant cyclone trajectories. Investigation of the seasonal variability of the cyclone frequencies shows that the highest number of cyclones occurs during winter. The variability of the subtropical jetstream latitude is analysed by multi-variable regression involving cyclone numbers, the numbers of occurrences of the Mediterranean Persistence High Pressure (MPHP), which is an extension of the Azore High Pressure and their periods. This analysis revealed that the most important factor among the three factors chosen is the number of observed blocking cases over Turkey. Although the northern parts of Turkey are accepted as having a transitional type climate between the Mediterranean and temperate regions, our results showed that they are more influenced by cyclones of Mediterranean origin.

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Analysis of Mesoscale Patterns in Relation to Synoptic Conditionsover an Urban Mediterranean Basin

Cited by 61 publications

References 17 publications

The role of sea-salt emissions and heterogeneous chemistry in the air quality of polluted coastal areas

The role of sea-salt emissions and heterogeneous chemistry in the air quality of polluted coastal areas

Comprehensive analysis of the climate variability in the eastern Mediterranean. Part I: map‐pattern classification

Cyclone track variability over Turkey in association with regional climate

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