Etesian winds outbursts over the Greek Seas and their linkage with larger-scale atmospheric circulation features: Two real time data case studies

Prezerakos, N. G.

doi:10.20937/atm.52838

Cited by 3 publications

(9 citation statements)

References 21 publications

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“…This finding in Prezerakos (2022) is in agreement with those of Metaxas and Bartzokas (1994), who demonstrate that the Mean Sea Level Pressure (MSLP) activity center driving the variability of the Etesian winds is positioned over the Northwest Balkans. With the appearance of an Etesian winds outbreak, significant increase of the wind intensity usually occurs without any diurnal variability being observed for a minimum 1 and maximum 7 consecutive days.…”

Section: The Concept Of the Type A Etesian Windssupporting

confidence: 92%

“…With the appearance of an Etesian winds outbreak, significant increase of the wind intensity usually occurs without any diurnal variability being observed for a minimum 1 and maximum 7 consecutive days. These intensified Etesian winds with no diurnal variation are the so-called type B or Etesian winds outbursts studied in Prezerakos (2022). Thereafter, the wind intensity displays a gradual decrease from day to day and at the same times a distinct diurnal variation typically about 15 kn at noon falling to less than 10 kn at midnight.…”

Section: The Concept Of the Type A Etesian Windsmentioning

confidence: 91%

“…Minor west of 29 0 E the MSLP ranges between 1010 and 1004 hPa, decreasing southwards with the lowest values east of Rhodes Island. This means, in turn, that Greece is under the influence of the Balkan anticyclone and Asia Minor by the Persian trough (Prezerakos, 2022). The difference between night and day, that is, 00:00 and 12:00 UTC makes sense not only above land, where the pressure decreases as expected at 12:00 UTC, showing its strong dependence of the underlying terrain temperature change, but even an equivalent rising over sea.…”

Section: Numerical Experiment Initial Values: Ncep-gfs At 0000 Utc On...mentioning

confidence: 93%

“…Numerous papers cited in Prezerakos (2022) provide a detailed description of the climate of the Aegean during the warm season, the background atmospheric circulation and the physical characteristics of Etesian winds. Prezerakos (2022) provides a set of objective criteria to classify the Etesian winds in three distinct types (A, B, C) and their starting dates are given.…”

Section: The Concept Of the Type A Etesian Windsmentioning

confidence: 99%

“…Any kind of friction, mainly in the boundary layer Equation (3) shows clearly in vector form all the physical factors the observed wind depends on, being almost the same with those of equation (2). Although none of these factors is constant in case of the Etesian winds of type A, at a fixed Eulerian grid point the first three terms, although very important in case of Etesian winds type B (Prezerakos, 2022), can be considered zero for the sake of simplicity. However, the last two terms could be proved significant, as we shall see below.…”

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confidence: 99%

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The planetary boundary layer physical processes, the secondary thermal baroclinic circulation and inertial oscillation contribution to diurnal variation of the Etesian winds over the Aegean Sea

Prezerakos

2023

Atm.

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The Etesian winds constitute an important climatological phenomenon, which does not only moderate the heat during the summer in the Aegean Sea, but provide a source of clean renewable energy as well. Even though several papers have attempted to explain their dynamical and the physical characteristics, the respective processes that drive the diurnal variation of the wind speed are not fully understood. The objective of this paper is to identify the processes responsible for diurnal variation with observed maximum wind speed around noon and minimum around midnight. Analytical solutions of a primitive equation set in Eulerian form, after introducing suitable conditions and approximations, reveal an inertial oscillation over the Aegean Sea. Data based on direct observations, ECMWF IFS high resolution analyses and high-resolution simulations with the Weather Research and Forecasting (WRF) model are utilized to find out the type and the structure of the Planetary Boundary Layer (PBL) over the Aegean Sea. This PBL appears to be of a marine character and turbulent mostly during the day but less during the night. The direct impact of the local and regional thermally-driven circulations is found to be the main cause of the diurnal variation of the observed wind and partly the inertial oscillation. Results from numerical simulations certify these findings. Furthermore, the momentum and Newtonian heating exchanges by the physical processes inside the PBL, where the gradient wind together with smaller scales of atmospheric motions exist, are also necessary for explaining the variability of the Etesian winds.

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Section: The Concept Of the Type A Etesian Windssupporting

confidence: 92%

Section: The Concept Of the Type A Etesian Windsmentioning

confidence: 91%

Section: Numerical Experiment Initial Values: Ncep-gfs At 0000 Utc On...mentioning

confidence: 93%

Section: The Concept Of the Type A Etesian Windsmentioning

confidence: 99%

mentioning

confidence: 99%

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The planetary boundary layer physical processes, the secondary thermal baroclinic circulation and inertial oscillation contribution to diurnal variation of the Etesian winds over the Aegean Sea

Prezerakos

2023

Atm.

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Seasonal fluctuations of PM2.5 concentrations at six Greek islands

Fameli,

Kotrikla,

Polydoropoulou

et al.

Global NEST International Conference on Environmental Science &Amp; Technology

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PM2.5 concentrations in urban areas vary significantly spatially and seasonally. Measurements can be affected by multiply parameters such as anthropogenic activities, meteorological conditions as well as land use. In the present study one-year PM2.5 measurements from the network of low-cost sensors deployed at six Aegean Sea islands (Lemnos, Lesvos, Chios, Samos, Rhodes, and Syros) were used to study the seasonal changes and the possible impacts from the local sources (e.g., road transport, residential heating) on the air quality. It is the first time that such a long timeseries of PM2.5 concentrations was collected simultaneously at islands with different socioeconomic characteristics (e.g., Syros and Rhodes are among the most popular touristic destinations in Greece) and meteorological conditions (longer warm period in Rhodes in comparison to Lemnos, Lesvos, and Chios). Moreover, citizens’ insight on local air quality and emission sources was collected through the conduction of semi-structured interviews. Results revealed that lower PM2.5 concentrations were recorded during the warm period and the range of minimum – maximum concentrations was smaller. In the cold period peak values were measured at Lesvos, Samos, and Chios mainly in the evening hours. Comparing the mean seasonal concentrations, it was found that the lowest values were measured at Syros for both warm and cold periods.

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