Meteorology,a science in the service of mankind     

Konrad Cehak 《Geoforum》1973,4(2):3-5

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Über die Schwachwindauswahl bei Radiowindmessungen     

K. Cehak 《Meteorology and Atmospheric Physics》1963,14(1):69-77

Zusammenfassung Die Höhenwindmessungen über Wien in den Monaten Juni und Dezember (1952 bis 1960) zeigen als Stichprobe, daß ein Schwachwindauswahleffekt nur die Messungen mit dem Peiler SCR-658, der bis August 1954 verwendet wurde, merkbar beeinflußte. Dieser Effekt ist gleichzeitig auch ein Wetterlagenauswahleffekt und beeinträchtigt auch die Form der Windrosen. Bei den später in Wien verwendeten Meßgeräten, GMD-1A und Decca Radar WF 1, ist der Schwachwindauswahleffekt zu vernachlässigne.

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Summary The upper wind measurements over Vienna during the months of June and December (1952–1960) taken as a sample show that a bias in favor of light winds has only influenced noticeably the data measured by means of the SCR-658 used up to August 1954. This bias means likewise a selection of weather situations and it has an influence on the shape of wind roses, too. With the data measured by means of the instruments used later-on in Vienna, GMD-1A and Decca Windfinding Radar WF 1, the bias in favor of light winds can be neglected.

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Résumé La Mesure des vents en altitude à Vienne (Autriche) durant les mois de juin et décembre (1952 à 1960), pris comme échantillons, montre que l'effet d'élimination des quelques vents forts par la fonction de l'instrument n'a influencé que les mesures effectuées avec le goniomètre SCR-658, appareil utilisé jusqu'en août 1954. Cet effet se reporte sur le décompte des situations météorologiques. Il influenced également la forme des roses des vents. Il Peut par contre être négligé lors de mesures effectuées avec les appareils utilisés à Vienne (Autriche) après août 1954, soient le GMD-1 A et le Radar Decca WF 1.

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Mit 2 Textabbildungen  相似文献   

Buchbesprechungen     

Steinhauser  F.  Cehak  K.  Mörikofer  W. 《Meteorology and Atmospheric Physics》1963,14(1):96-110

Ohne Zusammenfassung  相似文献   

Note on the dependence of precipitation on the day of the week in a medium industrialized city     

Univ. Prof. Dr. K. Cehak 《Theoretical and Applied Climatology》1982,30(3):247-251

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Climate Change driven evolution of hazards to Europe’s transport infrastructure throughout the twenty-first century     

Christoph?MatullaEmail author  Brigitta?Hollósi  Konrad?Andre  Julia?Gringinger  Barbara?Chimani  Joachim?Namyslo  Tobias?Fuchs  Markus?Auerbach  Carina?Herrmann  Brigitte?Sladek  Heimo?Berghold  Roland?Gschier  Eva?Eichinger-Vill 《Theoretical and Applied Climatology》2018,131(1-2):227-243

Air circulation due to the urban heat island (UHI) effect can influence the dispersion of air pollutants in a metropolis. This study focusses on the influence of the UHI effect on particulate matter (PM; including PM_2.5 and PM_2.5–10) between May and September 2010–2012 in the Taipei basin. Meteorological and PM data were obtained from the sites, owned by the governmental authorities. The analysis was carried out using t test, relative indices (RIs), Pearson product–moment correlation and stepwise regression. The results show that the RI values for PM were the highest at moderate UHI intensity (MUI; 2 °C ≤ UHI < 4 °C) rather than at strong UHI intensity (SUI; 4 °C ≤ UHI) during the peak time for anthropogenic emissions (20:00 LST). Neither the accumulation of PM nor the surface convergence occurred in the hot centre, as shown by the case study. At MUI, more than 89 % of the synoptic weather patterns showed that the weather was clear and hot or that the atmosphere was stable. The variation in PM was associated with horizontal and vertical air dispersion. Poor horizontal air dispersion, with subsidence, caused an increase in PM at MUI. However, the updraft motion diluted the PM at SUI. The stepwise regression models show that the cloud index and surface air pressure determined the variation in PM_2.5–10, while cloud index, wind speed and mixing height influenced the variation in PM_2.5. In conclusion, a direct relationship between UHI effect and PM was not obvious.  相似文献   

The spatial distribution of tornadoes and high wind impacts associated with inland-moving tropical cyclones in the southeastern United States     

Margaret M. Kovach  Charles E. Konrad II 《自然地理学》2014,35(3):245-271

The southeastern United States is routinely hit by tropical cyclones (TC). As TC track inland and dissipate their inland impacts can be substantial. This study examined the spatial patterns of societal impacts associated with tornadoes and high winds with 31 inland-moving TC that made landfall from 1985 to 2008. Hourly weather information was collected from all available first-order weather stations affected by each storm, as well as tropical cyclone preliminary reports issued from the National Hurricane Center. Societal impacts were identified through selected newspapers across the region and the National Climatic Data Center’s Storm Data. Geographic Information System (GIS) software was employed to make geometric measurements of the distance and direction of the impacts relative to storm center. From these measurements, the spatial distribution of the societal and meteorological impacts was plotted relative to the track (e.g., left vs. right) and location (forward vs. rear sector) of the cyclone center. Various tropical cyclone attributes, including size, strength, and forward speed of movement were then related to the occurrence of different impacts and their location relative to the cyclone track. The majority of tropical cyclone tornado and high wind impacts occur in the right-forward sector of the tropical cyclone. However, many TC produce impacts that occur in other sectors far from the center of circulation. These abnormalities are associated in many cases with interactions between the tropical cyclone circulation, topography, peripheral dry air, and extratropical synoptic weather features.  相似文献