Circulation Types and Their Influence on the Interannual Variability and Precipitation Changes in Greece

Maheras, P.; Αnagnostopoulou, Christina

doi:10.1007/978-3-642-55657-9_12

Cited by 58 publications

(72 citation statements)

References 6 publications

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“…This could be attributed to both on the complexity of the methodology and the variability of the precipitation regime. Generally, the raindays were better reproduced than the seasonal precipitation, which could be attributed to the fact that the occurrence of rainfall (raindays) is more strongly correlated to the 500 hPa circulation than the actual precipitation values (Maheras and Anagnostopoulou, 2003).…”

Section: Conclusion and Discussionmentioning

confidence: 95%

“…Our objective is to evaluate its skill in generating seasonal precipitation totals and raindays in Greece to apply it afterwards using the output data from a GCM for the present (control run) and the future (scenarios) period to estimate future climate changes. It is noteworthy that the evaluation of precipitation data is quite complicated owing to the fact that the precipitation regime in Greece presents highly irregular behavior on both the spatial and temporal scale (Maheras and Anagnostopoulou, 2003). It is well accepted that the main physical and physicogeographical factors controlling the spatial distribution of precipitation over Greece are: the atmospheric circulation, mountains in the west and east, the Mediterranean Sea-surface temperature distribution, rehumidification of the air masses crossing the Aegean Sea and land and sea interactions (Xoplaki et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Simulation of seasonal precipitation and raindays over Greece: a statistical downscaling technique based on artificial neural networks (ANNs)

Τολίκα

Maheras

Vafiadis

et al. 2006

Intl Journal of Climatology

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Abstract:A statistical downscaling technique based on artificial neural network (ANN) was employed for the estimation of local changes on seasonal (winter, spring) precipitation and raindays for selected stations over Greece. Empirical transfer functions were derived between large-scale predictors from the NCEP/NCAR reanalysis and local rainfall parameters. Two sets of predictors were used: (1) the circulation-based 500 hPa and (2) its combination along with surface specific humidity and raw precipitation data (nonconventional predictor). The simulated time series were evaluated against observational data and the downscaling model was found efficient in generating winter and spring precipitation and raindays. The temporal evolution of the estimated variables was well captured, for both seasons. Generally, the use of the nonconventional predictors are attributed to the improvement of the simulated results. Subsequently, the present day and future changes on precipitation conditions were examined using large-scale data from the atmospheric general circulation model HadAM3P to the statistical model. The downscaled climate change signal for both precipitation and raindays, partly for winter and especially for spring, is similar to the signal from the HadAM3P direct output: a decrease of the parameters is predicted over the study area. However, the amplitude of the changes was different.

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Section: Conclusion and Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Simulation of seasonal precipitation and raindays over Greece: a statistical downscaling technique based on artificial neural networks (ANNs)

Τολίκα

Maheras

Vafiadis

et al. 2006

Intl Journal of Climatology

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“…This strand of research is continued by Michailidou et al (2009aMichailidou et al ( , 2009b. The authors identified weather types by data clustering of two data types: meteorological and circulational, with the latter following the classification by Maheras et al (2000Maheras et al ( , 2003. In Poland a similar approach was adopted by Niedźwiedź (1981Niedźwiedź ( , 1983, who applied his own typology of atmospheric circulation and the weather conditions.…”

Section: Introductionmentioning

confidence: 99%

Weather types accompanying very high pressure in Krakow in the period 1901–2000

Bielec-Bąkowska

Piotrowicz

2010

Intl Journal of Climatology

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ABSTRACT:The paper presents a classification of weather types observed in Krakow during the 20th century on days with particularly strong highs. The classification was based on daily values of a number of weather elements recorded at Krakow's Historic Weather Station during the period 1901-2000. Days with very high pressure were defined as those with an air pressure at 12 UTC equal to or greater than the 99th percentile of all the cases analysed (≥1037.5 hPa). A slightly modified version of a classification developed by Woś (1999) was used to determine weather types on each of the days identified. Very high pressure was found to have occurred solely during the cold half of the year (October-March). It was mostly accompanied by fairly frosty (9---) or moderately frosty (8---) weather types; subtype: sunny or with little cloud amount and very sunny (-02-) and very cloudy, without sunshine or with little sunshine (-20-); and weather class: without fog (---0). No significant annual or seasonal trends were found in the occurrence of days with very high pressure or in the various weather types.

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“…Furthermore, in a future warmer climate, where there will probably be a change in the extremes, the assessment of these changes, particularly of the frequency and intensity of the extreme events receives great importance. Especially in the case of precipitation, Santos et al (2007) have demonstrated that an estimation of the changes in the rainfall extremes in a modified future climate could be helpful for the development of appropriate adaptation and mitigation strategies.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the study and the association of the occurrence of extremes and the large-scale circulation could reveal novel information about the physical processes that dominate during extreme conditions (Santos et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Extreme precipitation related to circulation types for four case studies over the Eastern Mediterranean

et al. 2007

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Abstract. The analysis of the links between the extreme precipitation and the associated atmospheric conditions through an aloft circulation type approach at the 500-hPa geopotential level, for the time period of 1958-2000, is the main motivation for the present study. Four stations in the eastern Mediterranean (17.5 • E to 37.5 • E and 30 • N to 40 • N) were selected as separate case studies. The extreme precipitation conditions were defined by the two most widely used indices: the 90th and 95th percentiles. It was found that two cyclonic types (C -with its centre over the station and Cwsw -with its centre at the WSW of the station) were mainly associated with extreme rainfall conditions for all the selected stations. Generally, these circulation types are deepening during days with extreme precipitation in comparison to the general mean field of the type.

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Circulation Types and Their Influence on the Interannual Variability and Precipitation Changes in Greece

Cited by 58 publications

References 6 publications

Simulation of seasonal precipitation and raindays over Greece: a statistical downscaling technique based on artificial neural networks (ANNs)

Simulation of seasonal precipitation and raindays over Greece: a statistical downscaling technique based on artificial neural networks (ANNs)

Weather types accompanying very high pressure in Krakow in the period 1901–2000

Extreme precipitation related to circulation types for four case studies over the Eastern Mediterranean

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