An assessment of climate change impact on air masses arriving in Athens, Greece

Karozis, Stelios; Sfetsos, Athanasios; Gounaris, Nikolaos; Vlachogiannis, Diamando

doi:10.1007/s00704-021-03624-x

Cited by 6 publications

(6 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, RCP8.5 presents extremely windier conditions for the Ionian islands and Crete. This result agrees with the findings of Karozis et al [56] that highlighted the reduction in the persisting anticyclonic activities over Greece and the Balkans in the near future, a change that denotes less frequent stagnant atmospheric conditions. The same study indicated a possible reduction in the passage of cyclones over Greece originating from the cyclogenesis region of the Central Mediterranean and the Adriatic Sea that could explain the reduced extreme-rainfall findings.…”

Section: Multi-hazard Probability Mapssupporting

confidence: 93%

“…During the historical period, the areas of high wind-speed (exceeding 15 m/s) probability are found to be consistent with other studies in the literature [45,55,56] (Figure 6a) and in accordance with the known synoptic atmospheric systems associated with the prevailing wind patterns. More particularly, the areas of the northeastern Aegean Sea are impacted by north-easterlies and the central Aegean by the Etesians, whereas the topography of Crete significantly amplifies the patterns of the extreme winds.…”

Section: Windsupporting

confidence: 91%

See 1 more Smart Citation

Quantifying the Occurrence of Multi-Hazards Due to Climate Change

et al. 2022

Self Cite

View full text Add to dashboard Cite

This paper introduces a climatic multi-hazard risk assessment for Greece, as the first-ever attempt to enhance scientific knowledge for the identification and definition of hazards, a critical element of risk-informed decision making. Building on an extensively validated climate database with a very high spatial resolution (5 × 5 km2), a detailed assessment of key climatic hazards is performed that allows for: (a) the analysis of hazard dynamics and their evolution due to climate change and (b) direct comparisons and spatial prioritization across Greece. The high geographical complexity of Greece requires that a large number of diverse hazards (heatwaves—TX, cold spells—TN, torrential rainfall—RR, snowstorms, and windstorms), need to be considered in order to correctly capture the country’s susceptibility to climate extremes. The current key findings include the dominance of cold-temperature extremes in mountainous regions and warm extremes over the coasts and plains. Extreme rainfall has been observed in the eastern mainland coasts and windstorms over Crete and the Aegean and Ionian Seas. Projections of the near future reveal more warm extremes in northern areas becoming more dominant all over the country by the end of the century.

show abstract

Section: Multi-hazard Probability Mapssupporting

confidence: 93%

Section: Windsupporting

confidence: 91%

Quantifying the Occurrence of Multi-Hazards Due to Climate Change

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…This internal variability of simulation was also found in the study of Knist et al (2020). Under RCP4.5, notable summer increases in the southerly ows were estimated up to 40%, which combined with large-scale subsidence, could cause a signi cant rise in the occurrence of heat wave events (Karozis et al 2021). The latter study which was part of our work revealed that estimated changes in the air mass ows under future high-emission scenarios imply changes in their associated synoptic patterns.…”

Section: Future Projection Of Precipitationsupporting

confidence: 67%

High resolution projections for extreme temperatures and precipitation over Greece

Politi

Vlachogiannis

Sfetsos

et al. 2022

Preprint

View full text Add to dashboard Cite

The present study investigated future temperature and precipitation changes over Greece using the Weather Research and Forecasting (WRF) model. WRF was driven by EC-EARTH output in the domain of Greece at very high resolution for the historical period (1980–2004), along with projected simulations, in the near future (2025–2049) and far future (2075-2099) under the Representative Concentration Pathways 4.5 (RCP4.5) and 8.5 (RCP8.5). Climatic variables were produced at 5-km grid spacing and 6-h interval. The historical simulation was evaluated against the available station observations. The analysis showed that the model underestimated the maximum temperatures and slightly overestimated the minimum temperatures. Also, the model simulated a small dry bias in precipitation with an excellent representation of the spatial patterns. The model projections for temperature under the two emission scenarios compared to the historical simulation revealed a robust magnitude of future warming with the most pronounced changes predominantly over the eastern areas of the country under the RCP8.5 in the far future. Projected precipitation changes were more evident in the far future with an overall decrease of the annual precipitation all over the eastern part of the country (with islands included) with the most dramatic reductions (above 40%) of seasonal precipitation observed under RCP8.5. Increases in the number of hot days were found everywhere with more pronounced changes over the plain areas under RCP8.5 in the far future. Significant increases of dry days were projected over the eastern part of the mainland and more intensely under RCP8.5 in the far future.

show abstract

“…The 500m AGL was chosen to reveal the direct influence of advancing air masses on surface temperature (Hernandez-Ceballos et al 2013). The 1500m AGL accounts for the impact of the planetary boundary layer (Karozis et al 2021), while the 5500m AGL was selected as the height that is not affected by the complex orography of Greece. This is because Greece has mountains with elevations up to 2900 meters.…”

Section: Backward Trajectories (Bts) Clusteringmentioning

confidence: 99%

“…The first method analyses the flow of air parcels in the atmosphere by using backward trajectories (BTs) produced by NOAA's Hybrid Single-Particle Lagrangian Integrated Trajectory model-HYSPLIT (Stein et al 2015). We also retrieve the main routes of the air masses with the clustering of those BTs (Jorba et al 2004;Markou and Kassomenos 2010;Karozis et al 2021). The second method identifies three days weather patterns (WPs) by applying clustering to gridded fields of values of atmospheric pressure at mean sea level (SLP) and geopotential height (GH500) at 500 hPa atmospheric pressure level (Xoplaki et al 2000;Putniković et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Atmospheric preconditions investigation of wet-cold compound events in Greece between 1980 and 2004

Markantonis,

Vlachogiannis,

Sfetsos

et al. 2024

Preprint

View full text Add to dashboard Cite

This study investigates the origins and the atmospheric circulation patterns that led to the occurrence of Wet-Cold compound events (WCCEs) recorded by the Hellenic National Meteorological Service (HNMS) between 1980 and 2004. The study employed two methods to provide insights into the issue. The first method involved identifying clusters from backward trajectories (BTs) at three heights above the arrival point (500, 1500 and 5500 metres). The second method aimed at detecting weather patterns (WPs) that result from the clustering of atmospheric pressure at sea level (SLP) and the geopotential height (GH500) at 500hPa from ERA5. To detect clusters for both methods, k-means clustering is applied. The analysis of backward trajectories produced seven clusters of BTs at each height level. Most of these clusters originated from the Northwest or North, with medium, short, and long-distance clusters being observed at 500m, 1500m and 5500m height levels, respectively. Despite analysing the temporal data, no clear connection was established between the clusters and months. From the cluster of GH500 and SLP variables for 94 different dates, we derived three main WPs. All WPs showed high GH500 values in Western Europe and lower GH500 values in Eastern Europe. Although SLP values differed significantly among the clusters, they helped to identify distinct weather patterns. Finally, we identified that on 7 out of the total of 94 different dates with WCCEs, large amounts of moisture are transported to Greece through the atmosphere over long distances by atmospheric rivers (ARs).

show abstract

An assessment of climate change impact on air masses arriving in Athens, Greece

Cited by 6 publications

References 70 publications

Quantifying the Occurrence of Multi-Hazards Due to Climate Change

Quantifying the Occurrence of Multi-Hazards Due to Climate Change

High resolution projections for extreme temperatures and precipitation over Greece

Atmospheric preconditions investigation of wet-cold compound events in Greece between 1980 and 2004

Contact Info

Product

Resources

About