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Middle East Technical University (2014)

Chemical composition of precipitation at different parts of Turkey

Ayaklı, Gül.

Titre : Chemical composition of precipitation at different parts of Turkey

Auteur : Ayaklı, Gül.

Université de soutenance : Middle East Technical University

Grade : Master of Science (MS) 2014

In this study major ion composition of rain water samples collected at General Directorate of Meteorology Antalya, Balıkesir and Trabzon rain sampling stations were analyzed. The major ions SO42-, NO3-, NH4+, Cl-, Ca2+, K+ and Na+ were analyzed by ion chromatography. Data generated in these stations are compared to evaluate how chemical composition of rainwater changes as air masses travel on the Anatolian plateau. Data also demonstrate how rainwater composition varies seasonally at different parts of Turkey. Reasons behind these variations are investigated using statistical tools. Multivariate statistical tool Positive Matrix Factorization was used to understand types of sources affecting precipitation composition at different locations in Turkey. As a result, four types of factors were resolved as long range transport, crustal emissions, sea salt and fertilizer usage. Similarly, trajectory statistics are used to understand locations of sources. Data evaluation heavily base on back trajectory information. Back trajectories, arriving the stations at the mid day of every sample, were collected using HYSPLIT trajectory model. HYSPLIT is 3D isentropic trajectory model developed by the US National Oceanic and Atmospheric Administration (NOAA). The model will be run at NOAA computers and results are transferred to our computers.

Mots clés : Eastern Mediterranean Atmosphere, Back trajectory, Potential Source Contribution Function (PSCF), Sulphate (SO42-)


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