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Posted: **Sun May 22, 2022 5:16 pm**

: 3 Figure 3 1 Shows Ph Changes In The Surface Ocean This Is Largely Due To The Increase Of Co2 In The Atmosphere And Th 1 (224.19 KiB) Viewed 12 times

: 3 Figure 3 1 Shows Ph Changes In The Surface Ocean This Is Largely Due To The Increase Of Co2 In The Atmosphere And Th 2 (65.2 KiB) Viewed 12 times

3. Figure 3.1 shows pH changes in the surface ocean. This is largely due to the increase of CO2 in the atmosphere and thus dissolution of more CO2 in the seawater. 8.14 8.12 8.10 Hd 8.08 8.06 Slope = -1.8 x 10-3/y 8.04 1990 1995 2005 2010 2000 Year Figure 3.1 The decrease in pH in surface water at the Hawaii Ocean Time Series station. Divalent Metals 35 30 25 20 % Increase 15 10 I.L . 5 0 Mn Fe Co Ni Cu Zn Be Cd PbH Metal Figure 3.2 The projected (model predicted) percentage increase in the concentration of free divalent ions in seawater over the next 1000 years (divalent ions stands for Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, etc.)

Answer the following questions: a) [4 pts] Explain why pH decreasing with more CO2 dissolved in seawater (list the reactions involved). b) [5 pts] Guess how the average global sediment CaCO3 content would have changed since 1900 and provide your explanation (list the reactions). c) [6 pts] Explain the data shown in Figure 3.2 if we believe that the trend in Figure 3.1 will continues to hold in the future. Spell out the reactions (or group of reactions) involved in the processes you are discussing.