Pacific Southwest

Title: Ozone concentrations at the Bulgarian Govedartsi ecosystem site in early summer of 1994 and 1995

Author: Donev, Evgeny; Zeller, Karl; Bojinov, Christo

Date: 1998

Source: In: Bytnerowicz, Andrzej; Arbaugh, Michael J.; Schilling, Susan L., tech. coords. Proceedings of the international symposium on air pollution and climate change effects on forest ecosystems. Gen. Tech. Rep. PSW-GTR-166. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 65-72

Station ID: GTR-PSW-166

Description: Ozone measurements are presented from the Bulgarian Govedartsi ecosystem study site, Ovnarsko No. 3. The site is located on the south slope of the Govedartsi Valley in the northwestern part of the Rila Mountain area. The Rila is the highest mountain in the Balkan peninsula and is representative of rural conditions in that part of Europe. The experimental site, Ovnarsko, is situated at 1,600 m above sea level and about 10 km west of the village of Govedartsi. There are no anthropogenic sources for ozone precursors for at least 30 km in all directions. Ozone concentrations within the Govedartsi Valley are strongly influenced by thermally driven local winds from late spring to summer that occur during high pressure synoptic weather conditions. In these cases a thin stable cold layer of downslope wind is experienced during the night, separating surface air from the higher boundary layer air. This helps the reduction of ozone concentrations from dry deposition measured at the Ovnarsko site. During the 1994 and 1995 measurement periods no high ozone concentration episodes were detected. This may be because of either an absence of significant anthropogenic sources of ozone precursors in this part of the Balkan peninsula or to the shielding of the Valley during high pressure conditions. In general, ozone concentrations at Ovnarsko were below 35 ppb.

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Citation

Donev, Evgeny; Zeller, Karl; Bojinov, Christo  1998.  Ozone concentrations at the Bulgarian Govedartsi ecosystem site in early summer of 1994 and 1995.   In: Bytnerowicz, Andrzej; Arbaugh, Michael J.; Schilling, Susan L., tech. coords. Proceedings of the international symposium on air pollution and climate change effects on forest ecosystems. Gen. Tech. Rep. PSW-GTR-166. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: 65-72.