Çevre Teknolojisi

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Browsing Çevre Teknolojisi by Subject "Air -- Pollution."

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    Analysis of Saharan Desert dust transport to the Anatolian Peninsula: a megacity perspective
    (Thesis (M.S.)-Bogazici University. Institute of Environmental Sciences, 2010., 2010.) Akınç, Gül.; Yenigün, Orhan.; Kindap, Tayfun.
    Mineral dust is one of the most significant constituent among the air pollutants. Besides its negative effects on human health, it influences the radiation balance of the Earth. The greatest source of mineral dust over the world is known as the Saharan Desert. The lifted dust from the Saharan region has been distributed over many parts of the Northern Hemisphere. Especially, during the spring period, the desert dust has been transported to the eastern Mediterranean region. From this point of view, contribution of Saharan Desert dust to the Istanbul’s coarse particulate matter levels has been investigated. To find out the clues of the transport, a numerical meteorological model called Weather Research and Forecasting has been run for the month of April in year 2008. The meteorological patterns of the model domain such as distribution of horizontal and vertical wind vectors, backward trajectory analysis of Istanbul have been examined to decide on the transport. In addition to the WRF model outputs, three additional models have been used to support the model data. Results of WRF and the other supportive models indicate that during the spring, there is an obvious contribution of Saharan Desert dust to the high PM10 levels of Istanbul.|Keywords: Meteorological Modeling, Saharan Dust Transport, Anatolian Peninsula, Istanbul, WRF.
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    Climatological trajectory analysis of air pollution from Istanbul to its surroundings
    (Thesis (M.S.)-Bogazici University. Institute of Environmental Sciences, 2009., 2009.) Dede, Bahar.; Yenigün, Orhan.; Kindap, Tayfun.
    Megacities’ pollution problems are rising day by day because of population growth, transportation, traffic and industrial activities. Istanbul is one of the largest cities in Europe. Dense population and vehicle traffic, irregular urbanization and industrialization are the important problems of Istanbul that contribute to the air pollution. In the first part of this research, trans-boundary pollutant transport originating from Istanbul was assessed in terms of meteorology and trajectory approach. NCEP/NCAR (National Centers for Environmental Predictions/National Centers for Atmospheric Research) reanalysis data (NNRP-NCEP NCAR Reanalysis Project -2.5°, 6-hourly) for the 30-year period from 1961 to 1990 was used for a comprehensive climatological trajectory evaluation. The second part of the research contains a case study for a selected episode (22- 25 July 2002) using MM5 model. Results show that, Istanbul is a regional air pollution source for its surroundings. Air pollutant may be transport from Istanbul to the surrounding area throughout the year as a result of the main wind directions. Although climatological trajectory approach gives general knowledge about air transport, it is impossible to predict daily air parcel movements based on it.|Keywords: Air Pollution, Air Modeling, Trajectory Analysis