Pollutants affect not only the environment in which they originate since they are also transported by air currents to other locations. For this reason, air pollution is a global problem for all countries and the air and water quality need to be monitored carefully. More information on precipitation chemistry is required to determine the source of pollution as well as its effects on the ecosystems. In this study, precipitation chemistry has been analyzed for the first time by using simple bulk collectors located at four different sites in Northwest Turkey for a period of two years. About 650 sequential rainwater samples were collected and analyzed for pH, electrical conductivity, anions such as SO

Comparison of Micrometeorological Methods used for the Determination of Actual Evapotranspiration Levent ŞAYLAN1, Yunus Özkoca2*, Barış Çaldağ1, Fatih Bakanoğulları3 1Istanbul Technical University, Faculty of Aeronautics and Astronautics, Department of Meteorological Engineering, İstanbul *Antalya Provincial Disaster and Emergency Directorate,  Antalya 3Atatürk Soil Water and Agricultural Meteorology Research Institute, Kırklareli * * Corresponding Author: yunus.ozkoca@afad.gov.tr  Abstract:  Among upmost important effects of climatic variability and change are the related variations in type, amount and timing of precipitation at global or regional scales. This aspect causes different effects from the agricultural point of view.  Among these effects the drought phenomenon comes to the forefront.  Efforts on eliminating the agricultural drought problem are mainly made by irrigation.  That’s why the upmost important portion of available water is consumed by agricultural irrigation, globally. Concordantly, the evapotranspiration plays a crucial role on determination of the irrigation water requirement for agriculture and planning the related systems. Usage of the methods on direct measurement of actual evapotranspiration by global means, however; is quite scarce.  In this study, the Bowen Ratio Energy Balance and micrometeorological Eddy Covariance Methods, which are widely in use for the measurement of actual evapotranspiration, have been used within the 2009-2010 wheat growing season in Kırklareli. In conclusion, a comparative evaluation of these approaches was done for the advantages and disadvantages by means of their determination abilities of actual evapotranspiration.  Key words:  Evaporation, Evapotranspiration, Bowen Ratio, Energy Balance, Eddy Covariance