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Dissertationen zum Thema „Meteorology“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 25. Juli 2025

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1

Johansson, Cecilia. "Influence of External Factors on the Turbulence Structure in the Atmospheric Boundary Layer." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3221.

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<p>The theory used in today’s weather- and climate models to describe processes near the earth’s surface, i.e. transport of heat, moisture and momentum between the ground and the atmosphere, is based on the idea that only local factors are important, such as temperature and wind speed near the ground. However, from measurements made at two sites, one agricultural and one marine, it has been found that large eddies, which are related to the convective boundary layer height, influence the turbulence structure near the ground during unstable conditions more than previously realized. Especially th

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2

Collins, Matthew. "The meteorology of Mars." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359043.

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3

Larson, Ellis, and Nelly Åkerblom. "Spectral clustering for Meteorology." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297760.

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Climate is a tremendously complex topic, affecting many aspects of human activity and constantly changing. Defining some structures and rules for how it works is thereof of the utmost importance even though it might only cover a small part of the complexity. Cluster analysis is a tool developed in data analysis that is able to categorize data into groups of similar type. In this paper data from the Swedish Meteorological and Hydrological Institute (SMHI) is clustered to find a partitioning. The cluster analysis used is called Spectral clustering which is a family of methods making use of the s

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Björklund, Elin. "Observed Ice Supersaturated Layers over Sweden and Implications for Aviation Induced Contrails over the Baltic Sea." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-153694.

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In the atmosphere vertical extended layers that are in the state of super saturation with respect to ice can appear; these layers have been termed ice-supersaturated layers (ISSL). If an aircraft passes through an ISSL, persistent condensation trails can form. These contrails absorb the long wave radiation from the earth and reflect the incoming short wave radiation from space. The absorbing effect of the long wave radiation is although greater than the reflecting effect of the short wave radiation and therefore these contrails increase the greenhouse effect.This study contain statistics of wh

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Lindskog, Magnus. "On errors in meteorological data assimilation." Doctoral thesis, Stockholm : Department of Meteorology, Stockholm university, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7258.

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6

Engström, Malin. "En studie av Uppsala stads värmeö." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-203057.

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The urban heat island is an area restricted to a city center where the temperatureis higher than its surrounding environment. The greatest temperature difference isfound at night when the weather is calm and the sky is clear of clouds. There are twomajor causes behind this phenomena and the first one is the use of energy forheating of houses. The heat leaks through the walls of the buildings and warms upthe surrounding mass of air. The second one is the use of building material whichstore the suns radiation on daytime and releases the heat during night. The heatisland leads to larger costs for

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7

Söder, Mats. "Growth and removal of inclusions during ladle refining." Doctoral thesis, KTH, Materials Science and Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-45.

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<p>The overall purpose of this thesis work has been to further our understanding of the growth and removal of inclusions in gas- and induction-stirred ladles. The primary focus has been on alumina inclusions. </p><p>Growth mechanisms were studied using data from fundamental mathematical models of gas- and induction-stirred ladles. The results showed the turbulence mechanism to be the most dominant in alumina inclusion growth. The dynamic growth and removal of inclusions in a gas-stirred ladle was studied using mathematical modelling. The model results showed concentration gradients of inclusio

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Tunved, Peter. "On the lifecycle of aerosol particles : Sources and dispersion over Scandinavia." Doctoral thesis, Stockholm : Meteorologiska institutionen (MISU), Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-223.

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9

Sjöström, Stina. "Numerical exploration of radiative-dynamic interactions in cirrus." Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8201.

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<p>An important factor in forecast models today is cirrus clouds, but not much are known about their dynamics which makes them hard to parameterize. In this study a new theory was derived to enable a more correct way to describe the interplay between radiative heating and dynamical motions in these clouds. This hypothesis was tested by performing three dimensional simulations of cirrus clouds, using the University of Utah Large Eddy Simulator (UULES). Eleven clouds of varying initial radius and ice water mixing ratio were examined, with the aim of finding a pattern in their dynamical features.

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10

Webber, Chris Paul. "Linking pollution, meteorology and climate change." Thesis, University of Reading, 2017. http://centaur.reading.ac.uk/73249/.

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This thesis examines the relationship between synoptic meteorology and particulate matter (PM10). PM10 is a pollutant of high interest to UK health policy (DEFRA, 2016) and this study evaluates the importance of Rossby wave breaking (RWB) on UK PM10 concentration ([PM10]). RWB can result in atmospheric blocking, which is one extreme of mid-latitude synoptic meteorological variability that favours the accumulation of PM10. This study finds significant increases (p < 0.01) in UK Midlands [PM10] resulting from winter-time northeast Atlantic/ European RWB. Furthermore, this study shows that northe

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Nilsson, Lena. "Hur mörkt blir det?" Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8044.

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<p>Inom Försvarsmaktens vädertjänst används ett PC-program för att beräkna illuminansen från måne och stjärnor under loppet av en vald natt. Korrektion för moln görs därefter genom ett schematiskt förfarande. I detta arbete ges förslag till två förändringar av ljusprognosmodellen.</p><p>1. Parametern ”markytans tillstånd” införlivas i modellen, samtidigt som hänsyn tas till mängden (och typen av) moln. Det sammanlagt tillgängliga ljuset under eventuella moln, S, kan beräknas genom sambandet</p><p>S=(1+Am)(I0*(1-N*Aso))/(1-Am*Asu*N)</p><p>där N är molnmängden, Aso molnöversidans albedo, Asu mol

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12

Andersson, Andreas. "En statistisk kartläggning av dimma för Arlanda flygplats." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132902.

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Dimma är ett komplext småskaligt väderfenomen som gäckat meteorologerna ända sedan väderprognosernas start och varit en bidragande orsak till att många mist livet inte minst inom flyget. Än idag är prognostisering av dimma mycket svårt i synnerhet strålningsdimma. Studier (COST, 2007) har visat att för att en modell ska kunna fånga formation av dimma krävs det i vissa fall att den skall kunna lösa upp inversionsskikt på 10m.Därtill uppgår osäkerheten i många fall för numeriska modeller vid fastställande av sikten i dimma till 50 %. Då kan en statistisk kartläggning specifikt för varje dimtyp u

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Esau, Igor. "Large Eddy Simulation of Non-Local Turbulence and Integral Measures of Atmospheric Boundary Layers." Doctoral thesis, Uppsala University, Department of Earth Sciences, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3321.

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<p>A new large eddy simulation (LES) code is developed and used to investigate non-local features of turbulent planetary boundary layers (PBLs). The LES code is based on filtered Navier-Stokes equations, which describe motions of incompressible, Boussinesq fluid at high Reynolds numbers. The code computes directly large-scale, non-universal turbulence in the PBL whereas small-scale, universal turbulence is parameterized by a dynamic mixed subgrid closure. The LES code is thoroughly tested against high quality laboratory and field data. </p><p>This study addresses non-local properties of turbul

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Cáceres, León Richard Humberto. "Impacto de la asimilación radar en el pronóstico de precipitación a muy corto plazo usando el modelo WRF." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/665103.

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El propósito de esta investigación es maximizar el impacto de la asimilación de datos radar sobre el pronóstico de precipitación a muy corto plazo usando el modelo Weather Research and Forecasting (WRF), de tal manera que pueda ser implementado de modo operativo en los Servicios Meteorológicos Nacionales. En una primera fase se utiliza un episodio de precipitación extrema que tuvo lugar en Cataluña (NE de España) para probar varias configuraciones de predicción inmediata, basadas en el modelo WRF con la asimilación de datos radar, y en una segunda fase, se profundizan los resultados a travé

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15

Sundberg, Mikaela. "Making meteorology social relations and scientific practice /." Doctoral thesis, [Stockholm] : Stockholms universitet : Distributed by Almqvist & Wiksell International, 2005. http://catalog.hathitrust.org/api/volumes/oclc/71256128.html.

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16

Liu, Liqun. "Health effects of air pollution and meteorology." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-146119.

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17

Walsh, Emily Jane. "Moving mesh methods for problems in meteorology." Thesis, University of Bath, 2010. http://eprints.uwe.ac.uk/23629/.

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This thesis considers the development and implementation of a moving mesh strategy which is suitable for the numerical solution of partial differential equations (PDEs) that arise in problems relevant to meteorology. We concentrate primarliy on developing the Parabolic Monge-Ampère (PMA) moving mesh method. This is an r-adaptive method which is based on ideas from optimal transportation combined with the equidistribution principle applied to a (time varying) scalar monitor function (used successfully in moving mesh methods in one-dimension). The mesh is obtained by taking the gradient of a (s

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18

Keeling, Simon James. "Visual broadcast meteorology : communicating the weather story." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/8829/.

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Many millions of people watch television weather forecasts everyday, but a detailed analysis of the information such forecasts convey and how and why viewers watch them has not previously been undertaken. New technology is presenting television stations with both challenges and opportunities. Viewers no longer have to rely on watching a forecast at a time dictated by the television station, they can now choose when, where and how to watch forecasts. This thesis reviews the visual presentation of weather forecasts from paintings of the 14th Century to the latest on-demand technology. Viewers ar

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Jönsson, Bror. "Some Concepts of Estuarine Modeling." Doctoral thesis, Stockholm University, Department of Meteorology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-463.

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<p>If an estuarine system is to be investigated using an oceanographic modeling approach, a decision must be made whether to use a simple and robust framework based on e.g. mass-balance considerations, or if a more advanced process-resolving three-dimensional (3-D) numerical model are necessary. Although the former are straightforward to apply, certain fundamental constraints must be fulfilled. 3-D modeling, even though requiring significant efforts to implement, generates an abundance of highly resolved data in time and space, which may lead to problems when attempting to specify the "represe

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20

Åström, Gustav. "CO2-Variation over the Baltic Sea." Thesis, Uppsala University, Department of Earth Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8026.

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<p>The increasing levels of the greenhouse gas carbon dioxide (CO2) in the Earths atmosphere, caused by human release of CO2, has made it desirable to understand the factors determining the CO2-variation because of CO2’s warming effect on the Earths temperature which will change the premises of all life on earth.</p><p>The purpose of this investigation is to understand the effects of the largest factors of influence on the CO2-concentration - like sea, vegetation and anthropogenic outlets - in the Baltic Sea region, and possible surprises from the results. To be able to do this only from CO2-m

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21

Lundén, Jenny. "Atmospheric DMS in the High Arctic." Doctoral thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38178.

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During the Arctic summer when the anthropogenic influence is limited, the natural marine source of sulfur in the form of gas-phase dimethyl sulfide viz. DMS(g), is of great importance for cloud formation. The harsh environment of the Arctic makes it difficult to perform in situ measurements of DMS(g) and hence regional model simulations can serve as a complement to increase our understanding of DMS related processes in the Arctic. In this thesis a regional scale meteorological forecast model, extended with DMS(g) calculations, is used to provide a consistent three-dimensional time evolving pic

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del, Moral Méndez Anna. "Radar-based nowcasting of severe thunderstorms: A better understanding of the dynamical influence of complex topography and the sea." Doctoral thesis, Universitat de Barcelona, 2020. http://hdl.handle.net/10803/670869.

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Natural disasters of hydro-meteorological origin are the biggest risk worldwide. In Catalonia (NE of the Iberian Peninsula), severe weather and flash floods occur each year, resulting in major damage to property, losses in agriculture, and also of human lives. To reduce its impact, we need to improve the early warning systems and storm short-term forecasting. There’s a need to gain in-depth knowledge of severe thunderstorm dynamics, since the current accused conditions of global warming can impact in factors triggering these storms. The main objective of the present thesis is to enhance the kn

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23

Cardil, Forradellas Adrián. "Ecology, meteorology and simulation of large wildland fires." Doctoral thesis, Universitat de Lleida, 2015. http://hdl.handle.net/10803/365040.

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Extreme-temperature events are known to favor large wildland fires and have consequences for human health and mortality, forest disturbance patterns, agricultural productivity, and the economic repercussions of these consequences combined. To gain insight into whether extreme-temperature events are changing in light of global climate dynamics, the annual numbers of high-temperature days (those with temperatures higher than 20, 22.5, and 25 ºC at 850 hPa) were analyzed across southern Europe from the years 1978 to 2012. A significant increase in the frequency of these days was found in many are

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Lo, Chun-Fung. "Implication of urbanization on meteorology and air quality." online access from Digital Dissertation Consortium, 2006. http://libweb.cityu.edu.hk/cgi-bin/er/db/ddcdiss.pl?3298515.

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Stevens, David Eric. "An adaptive multilevel method for boundary layer meteorology /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/6776.

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26

Foster, James H. "GPS meteorology and the phenomenology of precipitable water." Thesis, University of Hawaii at Manoa, 2002. http://proquest.umi.com/pqdweb?index=4&did=765064511&SrchMode=1&sid=5&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1209143773&clientId=23440.

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Farnell, i. Barquè Carme. "Anàlisi, diagnosi i predicció d'episodis severs a Catalunya. Focalització en les pedregades del Pla de Lleida." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/666869.

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Catalunya, i en concret el Pla de Lleida, són zones sovint afectades per les pedregades. En general, els episodis més severs i freqüents es produeixen des de finals de la primavera fins a principis de la tardor. Aquest període coincideix amb el moment en què determinats cultius de la zona són altament vulnerables, degut al seu cicle vegetatiu. La importància a nivell econòmic i social que tenen les pedregades al territori català, com també la complexitat del fenomen, ha comportat que nombrosos científics hagin estudiat el tema des de diferents punts de vista. En aquesta tesi s'ha aprof

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Trapero, i. Bagué Laura. "Modelització de precipitacions intenses en zones d'orografia complexa: casos d'estudi al Pirineu Oriental." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/285202.

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Els episodis de precipitació intensa en zones de muntanya sovint es veuen afavorits pels efectes orogràfics que actuen com a mecanismes que modifiquen la precipitació. Aquest treball vol contribuir a millorar el coneixement dels processos fonamentals que afecten la precipitació quan aquesta té lloc en una zona d'orografia complexa com és el cas de la zona oriental dels Pirineus, situada a la Mediterrània nord-occidental. En aquest treball de tesi, a partir de modelitzacions numèriques d'alta resolució realitzades amb els models WRF i MESO-NH de nou casos d'estudi diferents, s'investiguen les c

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Kazempour, Alireza. "Meteorological studies of cut-off lows over Australia with a VHF radar /." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phk2361.pdf.

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Potvin, Guy. "The application of RASS in urban boundary layer meteorology." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0019/NQ44556.pdf.

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Summers, Phillip R. "Determination of planetary meteorology utilising aerobot flight control sensors." Thesis, Aberystwyth University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417486.

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32

Graversen, Rune Grand. "On the recent Arctic Warming." Doctoral thesis, Stockholm University, Department of Meteorology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7473.

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<p>The Arctic region attracts considerable scientific interest in these years. Some of the Earth's most pronounced signs of the recent climate change are found here. The summer sea-ice cover is shrinking at an alarming rate. At the same time the region warms faster than the rest of the globe.</p><p>The sea-ice reduction implies an increase of solar-radiation absorption at the surface leading to warming which is expected to be larger at higher than at lower latitudes. It is therefore often assumed that the sea-ice reduction is a major cause of the observed Arctic temperature amplification. Howe

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Lager, Kristoffer. "Utveckling och utvördering av statistiska metoder för att öka träffsäkerheten hos lokala vindprognoser." Thesis, Uppsala University, Department of Earth Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9136.

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<p>Wind is used as an energy source all over the world. To be able to use this effectively, there is a need for as good forecasts and forecast models as possible. One of these models is Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS®) that is used to calculate short time forecasts. This model is used here to calculate wind speeds at two different areas in Västra Götaland, Bengtsfors and Vänersborg. There are also wind measurements with SODAR stations for these areas. The first part of this work is to investigate the difference between two model resolutions, 36 and 12 km, for the

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Cohen, Nitzan. "Röders prognoser, går de verkligen att lita på?" Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-157202.

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I kvällstidningen Aftonbladet har det under flera år publicerats artiklar med långtidsprognoser för sommaren. För prognoserna står en tysk man vid namn Wolfgang Röder, som tidigare arbetat på meteorologiska institutionen vid Freie Universität i Berlin. Röders metod att ställa långtidsprognoser är hemlig, men han har avslöjat för Aftonbladet att han bl.a. studerar vädret under våren och jämför med statistik från tidigare år. Han gör dessutom en rad påståenden om aprilvädrets påverkan på sommarvädret, framförallt juli månad. Syftet med undersökningen var att ta reda på hur pass bra Röders lång-

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Thomas, Joel. "COMPARATIVE ANALYSIS OF WIND ATLASES: WIND RESOURCE ASSESSMENT OF FORESTED SITES FOR WIND POWER DEVELOPMENT." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448544.

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Wind atlases are interactive databases used extensively for preliminary wind resource assessment aimed at optimal wind power development. The selection and processing of wind atlas data are important and will determine the quality of the subsequent WRA (Wind Resource Assessment) phases. This study aims to compare, process, and interpret different wind atlases in determining effective wind resource analysis for 14 different sites in Sweden. The wind atlas data is accessed, parsed, and compared using multiple methodologies to ensure a fair comparison. Several variables like wind speed, wind dire

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Hellgren, Mikael. "Pressure oscillations over Scandinavia during the last century and coupling with regional temperature and precipitation." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392448.

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Conclusions In this work we have used a multiple linear regression model, to see how different predictors are correlated to each other, and how they are correlated to temperature and precipitation in the southern part of Sweden. The correlation between the large and small indices vary over the year, but both cases show an increase in correlation during the winter. The MoVa index and the ViGö index are much better correlated than what the NAO and the KaUp indices are. One possible explanation for this can be the much shorter distace between the lines MoVa and ViGö in the latitudinal direction,

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Carlsson, Magnus. "The stable boundary layer over the ice covered Bothnian Bay." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392449.

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The turbulence structure in a stable boundary layer over ice has been studied. Data from the Bothnian Bay, measured during the BASIS field campaign in February/March 1998, have been used. Turbulence as well as wind- and temperature profiles were measured at three sites. The sites were Umeå at the Swedish East Coast, Kokkola at the Finnish West Coast and the ship R/V Aranda outside the Finnish coast. Turbulence parameters are studied in terms of their stability dependence. At stronger stability σu/u*, σv/u* and σw/u* all increase with stability. At near neutral stratification σw/u* increases w

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Sjöblom, Anna. "Case studies of the bora wind. Numerical simulations in three dimensions." Thesis, Uppsala universitet, Meteorologiska institutionen, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392284.

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Two days with bora has been numerically analysed, using a three dimensional hydrostatic mesoscale model developed at the Department of Meteorology, Uppsala University. The two simulated days, 22 March and 15 April 1982, have been compared to aircraft measurements done during the ALPEX-SOP in 1982. The model area was the northeastern shore of the Adriatic Sea. The bora on 15 April was easier to simulate than the one on 22 March, mostly due to the fact that this bora was shallower than the one on 22 March, and since the used model is developed for mesoscale studies, it works better with smaller

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Alm, Jens. "Fördelningen av blixtnedslag i Sverige." Thesis, Uppsala universitet, Meteorologiska institutionen, 1995. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392329.

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Detta examensarbete har utförts för att bestämma fördelningen av blixtnedslag i Sverige. En databas med blixtdata för åren 1987-1994 har använts. Antalet blixtar per 100 km2 och månad har beräknats, de högsta medelvärdena är 10 blixtnedslag och dessa erhålles under juli månad. Andelen positiva blixtar har även undersökts och funnits variera beroende av latitud och temperatur. Under vintermånaderna är andelen positiva blixtnedslag större än under sommarmånaderna.

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Sang, Peter. "Korrelationer mellan meteorologiska parametrar på flygbas." Thesis, Uppsala universitet, Meteorologiska institutionen, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392463.

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Syftet med studien är att finna korrelation mellan olika meteorologiska parametrar. För att göra detta har data insamlade av avdelningen Försök och Prov, vid flygvapnets väderskola, använts. Mätningarna som använts här är gjorda på Kostabasen i Småland från den 13 oktober 1993 till den 25 april 1994. Insamling har skett med den så kallade Bas90-vagnen. Studien är begränsad till atmosfärens gränsskikt. Gränsskiktet kan delas in i två delar, ett ytskikt närmast marken samt ett övergångsskikt ovanför detta. Då luft flödar över en ny typ av yta bildas ett internt gränsskikt. Utgående ifrån mätning

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Johansson, Cecilia. "Begränsningar i Monin-Obukhovs similaritetsteori." Thesis, Uppsala universitet, Meteorologiska institutionen, 1997. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392484.

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I den här studien analyseras gränsskiktshöjdens betydelse för hastighetsfältet i ytskiktet, med hjälp av Monin-Obukhovs (MO) similaritetsteori. Studien genomfördes för att verifiera tidigare resultat från en Large-Eddy simulering av Khanna och Brasseur (1995) som tyder på att hastighetsfältet inte bara beror på z/L utan även har ett starkt beroende av gränsskiktshöjden. Genom att använda mastmätningar och sonderingar från Marsta studeras hastighetsfältet och speciellt den dimensionslösa vindgradienten (Φm) och de normaliserade hastighetsvarianserna i horisontalled och vertikalled. Det visar si

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Moilanen, Johan. "Klimatologisk utvärdering av förekomsten av inversioner i radiosonderingar från Bromma 1990." Thesis, Uppsala universitet, Meteorologiska institutionen, 1992. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392108.

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En sammanställning av en databas av inversionsdata från sonderingarna från Bromma under 1990 har utförts. I denna databas lagrades datum, tid, marktemperatur, marktryck samt tryck och temperatur för basen och toppen av upp till tre inversioner. Därur kunde sedan höjder till tryckytorna och temperaturdifferenser mellan topp och botten beräknas. En statistisk undersökning av materialet utfördes med avseende på höjden till inversionsbasen och temperaturökningen i inversionsskiktet. Även temperaturgradienten för inversionsskiktet studerades. Resultaten sammankopplades med den aktuella synoptiska s

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Källstrand, Birgitta. "Analys av vindförhållandena i östra Blekinges kustområden och havet sydost därom." Thesis, Uppsala universitet, Meteorologiska institutionen, 1992. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392456.

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I detta arbete har vindförhållandena på Utlängan, Ungskär och Ölands södra grund studerats. För att göra detta har synop-data från SMHI:s stationer på Ungskär och Ölands södra grund för tidsperioden 900801-911130 använts. Dessutom har data från en mast som stod uppställd på Utlängans södra udde under delar av -90 och -91 samt ett 50-tal enkelviseringar, utförda på Utlängans östra sida under perioden 910324-910614, använts. En vindmodell har använts för att räkna upp vinden till höjder högre än mätningarna (upp till 125 m). Denna modell användes också för att på data från masten beräkna vinden

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Svedestig, Maria. "Svaveldepositionens förändring i Sverige 1970–1990." Thesis, Uppsala universitet, Meteorologiska institutionen, 1992. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392465.

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Efter stora påtryckningar från skandinaviskt håll genomfördes i början av 1970-talet ett sameuropeiskt mätprojekt för att klargöra huruvida svavelutsläpp i exempelvis Storbritannien påverkade försurningen av sjöar i Skandinavien. Elva västeuropeiska länder deltog i projektet – kallat LRTAP – vars mätningar pågick under åren 1972–1975. Dessa mätningar bekräftade de teorier som drivit fram projektet – att luftföroreningar (i detta fall svavelföreningar) kan transporteras långa vägar i atmosfären för att sedan deponeras i ett område långtifrån källan. Därigenom kom de fram till att ett land inte

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Eronn, Ingrid. "Effects of a Sea Breeze Circulation on Fluxes in the Marine Boundary Layer Over the Baltic Sea." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392488.

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Two days in May 1997 has been studied. During one of the days a sea breeze circulation occured, and the two days were compared in search for effects from the sea breeze on the ﬂuxes in the marine boundary layer. Measurements were made on a tower at the small island Östergarnsholm east of the island Gotland, and by an instrumented aircraft over the sea east and west of Gotland. The direction of the geostrophic wind were about northwest during the time period, but 17 m/s during May 3 and 7 m/s during May 4. The stratiﬁcation was stable over the main part of the Baltic sea because of the large te

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Hedblom, Anna. "The Wind Climate in a Mountain Valley in Northern Sweden." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392619.

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The wind climate in a valley has been studied. Long time data from towers along the valley have been used, together with data from two field campaigns. The campaigns took place during two weeks in May 1999 and two weeks in September 2000. During the field campaigns wind speed and direction were measured, both with small masts and with pilot balloon tracking. A comparison of single and double theodolite tracking is performed. It is found that single theodolite tracking is good enough to use. The ascent rate of the balloon is seen to be slightly higher than the earlier assumed 4 m/s. An investig

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Andrae, Ulf. "Turbulence structures in a non-stationary marine atmospheric boundary layer." Thesis, Uppsala universitet, Meteorologiska institutionen, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392332.

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The vertical structure in the coastal marine atmosphere has been investigated using data from aircraft measurements performed along the Blekinge coast. The present data are from the third of October 1990. The main feature is fairly homogeneous horizontal conditions and a subceeing boundary layer which lowers from 600 meters down to about 50 meters during the day. The turbulence were found to be in a decreasing state. The turbulence parameters were normalized using normal stationary scaling, in order to compare with other results.

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Gregow, Erik. "Ljudutbredning i fjällterräng och slättland." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392717.

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l rapportens första del studeras ljudutbredningen i fjällterräng. Mätningar har gjorts på ett vindkraftverk som är placerat i en dal, i svenska fjällen. Vindkraftverkets källstyrka varierar. Medelljudtrycksnivån är 51 dBA ±3 och ljudnivåns variation för de olika frekvenserna pendlar mellan 0-8 dBA, detta diskuteras i kapitel 1.6. Ljudmätningarna uppfyller ej strikt de fastslagna normer och standarder som finns angivna i rapporten: Measurement of noise immission from wind turbines at noise receptor locations, 1997. I kapitel 1.7 beräknas ljudstrålarnas krökningstal. Talet beskriver hur de meteo

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Lundblad, Maria. "Geostrofiska vinden - en klimatologisk studie." Thesis, Uppsala universitet, Meteorologiska institutionen, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392765.

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En enkel metod att genom beräkning av tryckgradienter i väst-ostlig och nord-sydlig riktning beräkna den geostrofiska vinden, används på tre områden i Sverige. Tryckdata fås från SMHI-bulletinen 1970-78. Resultaten analyseras statistiskt med avseende på hastighet, riktning, årstid och temperatur så att det sedan kan avgöras om metoden ger rimliga resultat. Det visar sig att på grund av, framför allt, systematiska fel i den ursprungliga tryckdatan blev resultaten av denna analys inte att betrakta som användbara. Det finns dock stort utrymme för förbättringar av metoden.

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Carlsson, Andreas. "A comparison between wind measurements with doppler weather radar and rawinds." Thesis, Uppsala universitet, Meteorologiska institutionen, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392766.

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Comparisons between wind measurement with doppler weather radar and wind measurement with rawinds in different weather situations is done. The study is made in a statistical way with some comparable parameters as outcome. The importance of the weather and different weather situation’s effect on the results are discussed, both in form of the winds accuracy and the probability of getting any wind at all as outcome. The study shows that wind measurement with doppler radar at lower elevations not has so good accuracy, but it becomes better the higher up we measure. At the same time will we lose a

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