Abstract
This chapter analyzes the 15-year long atmospheric carbon dioxide (CO2) mixing ratio record measured at Hegyhátsál, Hungary, to reveal the effect of regional climate change and fluctuations. While the long-term trend and the temporal fluctuation of the growth rate faithfully follow the global tendencies, the shorter term variations show special features. The authors present the distorted seasonal cycle caused by the seasonality in the atmospheric vertical mixing and the tendentious change in its shape, which is attributed to the gradual warming and the prolongation of the growing season. The decreasing summer diurnal amplitude and the decreasing seasonal amplitude in the mixing ratio and the higher than average summer CO2 mixing ratio growth rate in the first period of the measurements (1994–2003) with increasing temperature and decreasing precipitation are explained as the consequences of the reduced activity of the biosphere in the influence area of the station and that of the reduced biomass under the increasingly unfavorable environmental conditions. The explanation is supported by the colocated tall tower surface–atmosphere CO2 exchange measurements and by the crop yield statistics of the dominantly agricultural region around the station.
Citation: Haszpra, L., Barcza, Z., 2010: Atmospheric trends and fluctuations Regional climate change and fluctuations as reflected in the atmospheric carbon dioxide concentration. In: Atmospheric Greenhouse Gases: The Hungarian Perspective (Ed.: Haszpra, L.), pp. 49–62.
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Acknowledgments
During the years, the Hungarian atmospheric greenhouse gas monitoring received significant financial support from the US–Hungarian Scientific and Technological Joint Fund (J.F. 162, J.F. 504), the European Commission R&D Framework Programmes (AEROCARB – EVK2-CT-1999-00013, CHIOTTO – EVK2-CT-2002-00163, CarboEurope-IP – GOCE-CT-2003-505572, IMECC – RII3 026188), the European Commission’s INTERREG IIIB CADSES program (Carbon-Pro – 5D038), as well as the Hungarian funding organizations (Hungarian Scientific Research Fund – T7282, T042941, CK77550; Hungarian Ministry for Environment – 027739-01/2001, K0441482001, K-36-02-00010H).
In addition to original material, this chapter is essentially an updated version of Haszpra and Barcza (2010).
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Haszpra, L., Barcza, Z. (2011). Regional Climate Change and Fluctuations as Reflected in the Atmospheric Carbon Dioxide Concentration. In: Haszpra, L. (eds) Atmospheric Greenhouse Gases: The Hungarian Perspective. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9950-1_4
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