Ocean Acidification Lecture Slides PDF
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North Carolina State University
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Summary
These lecture slides cover the topic of ocean acidification, discussing the chemical processes, impacts on marine life, and potential future scenarios. The slides include diagrams, data, and information about how ocean acidification is impacting marine life, and what the future may hold.
Full Transcript
Ocean pH & Acidification Learning outcomes: Define pH and describe the pH scale Explain the chemical reactions that occur when CO2 dissolves in seawater Describe pH values in today’s ocean and how they differ from those projected in the year 2100 Explain the impact of acidification on car...
Ocean pH & Acidification Learning outcomes: Define pH and describe the pH scale Explain the chemical reactions that occur when CO2 dissolves in seawater Describe pH values in today’s ocean and how they differ from those projected in the year 2100 Explain the impact of acidification on carbonate saturation depth Describe the impact of acidification on biological organisms in the laboratory Explain the potential impact of ocean acidification on food webs and fisheries species 1 pH pH = -log [H+] http://ga.water.usgs.gov/edu/phdiagram.html 2 Seawater’s Buffer 3 Ocean pH Seawater is slightly alkaline Ocean water pH decreases with depth Upwelling brings lower pH water to surface 4 Increasing Carbon Dioxide 5 Future Estimates 6 pH Projections pH scale is logarithmic A 0.1 decrease in pH since pre‐industrial times: 30% increase in acidity 16% decrease in carbonate ion By 2100 we would have a 0.3‐0.4 pH decrease 100‐150% increase in acidity 50% decrease in carbonate ion 7 8 9 Impacts on Organisms 10 Marine Larvae Pacific oyster larvae Raised by the Taylor Shellfish Hatchery in natural waters of Dabob Bay, WA Left: Under favorable conditions (pCO2 = 403 ppm, Ωarag = 1.64, and pH = 8.00) Right: Under unfavorable conditions (pCO2 = 1418 ppm, Ωarag = 0.47, and pH = 7.49) http://dx.doi.org/10.5670/oceanog.2015.38 11 Video on Acidification and Oysters https://www.youtube.com/watch?v=x7MpI9dZIjk&feature=youtu.be 12 Effects on Pteropods Free‐swimming sea snails; sea butterflies http://ocean.si.edu/sites/default/files/imagecache/465x300/photos/PMEL_Feely_dissolving-shells_main_1.jpg http://oceanexplorer.noaa.gov/explorations/05arctic/background/biodiversity/media/limacina_helicina.html 13 14 Potential Impact on Fisheries Species Valuable commercial fisheries depend on species sensitive to OA Shellfish Predators that feed on calcifiers https://www.noaa.gov/media‐release/2018‐strong‐successful‐year‐for‐us‐fishermen‐and‐seafood‐sector 15
