Ocean acidification in the Baltic Sea: involved processes, metrology of pH in brackish waters, and calcification under fluctuating conditions
Globally, ocean acidification presents a threat to marine ecosystems. In the Baltic Sea, this process could so far not be quantified, partly due to a lack of appropriate pH observations. This study unravels a positive alkalinity trend in the Baltic Sea over the past two decades that counteracted aci...
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Other Authors: | , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | unknown |
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Universität Rostock Rostock
2018
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Online Access: | https://rosdok.uni-rostock.de/resolve/id/rosdok_disshab_0000001963 https://doi.org/10.18453/rosdok_id00002303 http://nbn-resolving.org/urn:nbn:de:gbv:28-diss2018-0135-7 http://purl.uni-rostock.de/rosdok/id00002303 |
Summary: | Globally, ocean acidification presents a threat to marine ecosystems. In the Baltic Sea, this process could so far not be quantified, partly due to a lack of appropriate pH observations. This study unravels a positive alkalinity trend in the Baltic Sea over the past two decades that counteracted acidification. Further, state-of-the-art spectrophotometric pH measurements in brackish waters are enabled by characterizing pH buffer solutions and the indicator dye m-Cresol purple at low salinities. Finally, pH fluctuations and their implications for benthic ecosystems are examined. Global gefährdet die Ozeanversauerung marine Ökosysteme. In der Ostsee konnte dieser Prozess bisher mangels aussagekräftiger pH-Messungen nicht quantifiziert werden. Diese Arbeit beleuchtet einen langfristigen Anstieg der Ostsee-Alkalinität über die vergangen zwei Dekaden, welcher der Versauerung entgegenwirkte. Weiterhin wird die spektrophotometrische pH-Messmethode für Brackwasser eingeführt, indem pH-Pufferlösungen und der Farbstoff m-Kresolpurpur für niedrige Salzgehalte charakterisiert werden. Abschließend werden pH-Fluktuationen und deren Bedeutung für benthische Ökosysteme untersucht. |
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