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  • 1
    Electronic Resource
    Electronic Resource
    On the strength of the ozone sink at the ground (1983)
    Springer
    Meteorology and atmospheric physics 33 (1983), S. 229-236 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Mit Messungen mit einer Ozonsonde wurde die Abnahme des Ozons am Boden auf einem halbstädtischen Platz im Norden Griechenlands bestimmt. Die Berechnung gründet sich auf Messungen der Beseitigung des Ozons hauptsächlich durch den chemischen Kontakt mit dem Boden in der stabilen Schichtung über dem Boden in der Nacht. Die obere Grenze der bestimmten Ozonabnahme betrug 1,1 · 1031 pro cm2 und Sekunde. Die Luftqualität und meteorologische Daten aus dem Gebiet werden ebenfalls besprochen.
    Notes: Summary Measurements with a tethered sonde ozone system are used to estimate the ozone sink at the ground in a semi-urban place in northern Greece. The estimate is based on measurements of the ozone removal, mostly by chemical contact with the ground, as the stable layer forms above the ground at night. An upper limit of the estimated ozone sink during this case study amounted to 1.1 · 1011 molecules cm−2 sec−1. Air quality and meteorological data for the region are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02275096
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence on the importance of diabatic heating as a divergence factor in the Mediterranean (1978)
    Springer
    Meteorology and atmospheric physics 27 (1978), S. 69-80 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Die Bedeutung der diabatischen Erwärmung im Mittelmeerraum wird hervorgehoben. Bezugnehmend auf eine eintache dynamische Theorie wird eine Gleichung abgeleitet, die es erlaubt, die Erzeugung von Divergenz durch den sensiblen Wärmestrom absuschätzen. Divergenzbeträge, die größenordnungsmäßig an die in stark ausgeprägten, synoptischen Systemen beobachteten Beträge heranreichen, können durch den sensiblen Wärmestrom in besonderen, jedoch nicht seltenen Fällen erzeugt werden. Außerdem zeigen die räumlichen und zeitlichen Verteilungen einiger Wetterelemente, insbesondere die Gewitterhäufigkeit, daß die diabatische Erwärmung im Mittelmeer eine bedeutsame Rolle spielt.
    Notes: Summary The importance of diabatic heating in the Mediterranean is emphasized. Based upon a simple dynamic theory, a formula is derived for a rough estimation of divergence production due to sensible heat flux. Divergence amounts, comparable to those due to rather strong synoptic systems, can be produced by sensible heat flux in some extreme but not rare cases. On the other hand, spatial and temporal distributions of some weather elements, mainly thunderstorm frequency, constitute a strong evidence for a major importance of diabatic heating in the Mediterranean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02246462
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  • 3
    Electronic Resource
    Electronic Resource
    Temporal variations of atmospheric tides over Athens, Greece (1995)
    Springer
    Meteorology and atmospheric physics 55 (1995), S. 113-123 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary The mean daily march of pressure (hourly values) for each month of the 96 year period 1894–1989 in Athens, Greece is studied using Fourier analysis. The annual variation of the harmonic parameters (amplitude, time of maximum,x andy-components) is examined. The globally excited 2nd and 3rd harmonics show in general the same behaviour as in other places of the Earth. Similar features show the corresponding parameters of the daily solar radiation march. The first harmonic displays some local characteristics. The long period fluctuations study revealed statistically significant trends in most parameters of the 2nd harmonic, most strikingly the 0.5 h shift in the time of its maximum during the 20th century. Power spectrum analysis showed the existence of a biennial oscillation inB 1, thex-component of the first harmonic, but this oscillation is mainly confined to the second half of the entire period. A periodicity of about 6 years which could be associated to the Southern Oscillation was also found inB 1 while inA 1, they-component, a periodicity close to the 11-year solar cycle and another one close to the nutation of the Earth's axis are present. The lunar tides are too small to be detected by the same methods. However the semilunar tide was revealed to be 10–20 times smaller than the semisolar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029606
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  • 4
    Electronic Resource
    Electronic Resource
    Pressure covariability over the Atlantic, Europe and N. Africa. application: Centers of action for temperature, winter precipitation and summer winds in Athens, Greece (1994)
    Springer
    Theoretical and applied climatology 49 (1994), S. 9-18 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary This paper deals with the surface pressure covariability over the Altantic/European sector of the Northern Hemisphere, using monthly grid point data for the 100 year period 1890–1989. Factor analysis is applied to 90 grid point time series for January, February, July, and August. The initial 90 pressure variables can be reduced to 7–8 factors in winter and 10 in summer. A winter teleconnection was identified, known as the seesaw phenomenon, between the Icelandic low and the Azores subtropical anticyclone. In order to define the centers of action for temperature, winter precipitation and summer northerly wind frequency (etesian days) in Athens and in the Aegean sea, the variability of the factor scores and of these weather elements is compared. It is shown that the center of action for temperature in Athens is found to be in north and northwest Europe (centered over southern Scandinavia). For winter precipitation, the center of action is located in the west and southwest Mediterranean and northwest Africa. Finally, for the etesian winds frequency variability, this center of action is found over the northern Adriatic and northern former Yugoslavia, while there is no evidence of influence by the southwest Asia thermal low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00866284
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  • 5
    Electronic Resource
    Electronic Resource
    Factor Analysis of some climatological elements in Athens, 1931–1992: covariability and climatic change (1995)
    Springer
    Theoretical and applied climatology 52 (1995), S. 195-205 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The climatological parameters of a station are, in general, intercorrelated to various degrees (e.g. cloudiness with sunshine duration or possibly rainfall with temperature). In this work, 15 climatological parameters of the National Observatory of Athens are distributed in groups where the contained parameters are highly covariant. This classification is achieved using P-mode Factor Analysis, based on the monthly values for the period 1931–1992. Using several known criteria, we found up to four significant factors. The first two are the most important ones including the “temperature” and the “precipitation” parameters, respectively, with loading values above 0.85. The other two are weaker and variable, depending on the month. Finally, climatic trends of the grouped parameters (factors) are examined and the result compared with those of studies using classical methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00864043
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  • 6
    Electronic Resource
    Electronic Resource
    Large warm advection over athens: a climatological and synoptical study (1978)
    Springer
    Theoretical and applied climatology 26 (1978), S. 51-61 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung In der vorliegenden Arbeit wird die Warmluftadvektion über Griechenland als ein niederschlagsverursachender Faktor untersucht. Insgesamt wurden 125 Fälle mit bedeutender Warmluftadvektion ausgewählt. Aus synoptischen Mittelkarten ist ersichtlich, daß diese Fälle durch die Ostwärtsverlagerung zweier, durch ein Hochdruckbebiet getrennter Depressionen verursacht werden. Die erste dieser Depressionen liegt über dem östlichen Mittelmeer, die zweite über dem Ostatlantik. Die Methode überlagerter Epochen wurde auf Niederschlag, niederschlagbares Wasser und Sättigungsdefizit in der 1000–500mb-Schicht während der Fälle mit bedeutender Warmluftadvektion angewendet. Während der 48 Stunden Zeitspanne solcher Fälle wurden keine nennenswerten Niederschlagsbeträge beobachtet. Aus dieser Analyse, sowie aus dem Verhalten des Showalter Index wird geschlossen, daß der Niederschlagsmangel während starker Warmluftadvektion über Südgriechenland auf diabatische Erwärmung und vermehrte statische Stabilität zurückzuführen ist. Diese Effekte werden durch eine abwärts gerichtete Vertikalbewegung verursacht.
    Notes: Summary In the present paper, warm air advection in the Greek area as a precipitation causing factor, is examined. A total of 125 large warm advection (L.W.A.) cases, were selected. From the mean synoptic charts it is observed that L.W.A.'s are a result of the eastward movement of a system of two depressions, separated by a high. The first depression is located over the eastern Mediterranean and the second over the eastern Atlantic. A superposed epoch analysis was applied to the precipitation amounts as well as to precipitable water and to the saturation deficit of the 1000/500 mb layer, during L.W.A. events. No appreciable precipitation amounts were found during the 48 hours of L.W.A. From the above analysis as well as from the calculations of the Showalter stability index it is concluded that the scarcity of precipitation in the south Greek area during L.W.A's should be attributed to diabatic heating and static stability, counteracting warm advection and caused by a field of downward vertical velocities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02266920
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  • 7
    Electronic Resource
    Electronic Resource
    Climate Variability and Urbanization in Athens (1999)
    Springer
    Theoretical and applied climatology 63 (1999), S. 65-72 
    Details
    ISSN: 1434-4483
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary  The effects of urbanization on the Athens National Observatory (NOA) long records are investigated, in the present study, examining the mean monthly maximum and minimum air temperature for the period 1925–1996, for NOA and the corresponding time series for Aliartos (ALI), a rural station located 70 km NW of Athens. The existing small urbanization effect in NOA before the second world war period increased after the war and up to about 1990, when the effect became stationary. The urbanization effect in NOA referred mainly to maximum temperature and to the warmer seasons of the year. It is attributed to the extensive building of Athens after the war around NOA site and up to the sea which increases the temperature of the sea breeze. The effect is also attributed to the rapid increase of the population and the number of motor vehicles mainly after 1970. Moreover the decreasing trend of precipitation during the period 1970–1990 may have contributed to the increase of maximum air temperature. The urbanization effect on maximum temperatures of NOA amounts about 2 °C in spring, summer and less in fall, while no urbanization effect is clear in winter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007040050092
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  • 8
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    Nontopological solitons as nucleation sites for cosmological phase transitions (2001)
    American Physical Society
    Details
    Publication Date: 2001-03-21
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society
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  • 9
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    Temporal variations of atmospheric tides over Athens, Greece (1995)
    Springer
    Details
    Publication Date: 1995-01-01
    Print ISSN: 0177-7971
    Electronic ISSN: 1436-5065
    Topics: Geography , Physics
    Published by Springer
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  • 10
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    Derivative expansion and gauge independence of the false vacuum decay rate in various gauges (2001)
    American Physical Society
    Details
    Publication Date: 2001-03-19
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society
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