Short Communication

Oceanological and Hydrobiological Studies

, Volume 40, Issue 3, pp 91-94

Long-term monitoring data reveal pH dynamics, trends and variability in the western Gulf of Finland

  • Andreas BrutemarkAffiliated withARONIA Coastal Zone Research Team, Novia University of Applied Sciences and Åbo Akademi University Email author 
  • , Jonna Engström-ÖstAffiliated withARONIA Coastal Zone Research Team, Novia University of Applied Sciences and Åbo Akademi University
  • , Anu VehmaaAffiliated withARONIA Coastal Zone Research Team, Novia University of Applied Sciences and Åbo Akademi University

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Abstract

Monitoring data on water pH are presented for the period between 1972 and 2009 from the sampling stations Längden and Storgadden, at the entrance to the Gulf of Finland, Baltic Sea. The overall pH in the area ranged from 9.2 to 7.4, on average 8.1, and showed a significant decreasing trend during the winter period corresponding to a median annual decrease of 0.006. The data corroborate previous findings about a seasonal effect, where pH is higher during summer than winter.

Key words

Baltic Sea acidification pH time series