The Carbon Cycle Carbon Dioxide and Carbonate system
The Carbon Cycle
Carbon Dioxide and Carbonate system Why is it important? 1. Regulates temperature of the planet 2. Important for life in the ocean 3. Regulates the p. H of water
70 ppm
CO 2 TEMPERATURE 4. 5 C
CO 2 Temperature 70 ppm
CO 2 changes in the last 300 yr 70 ppm Industrial Revolution
CO 2 changes in the last 50 yr Oceans Biosphere Rock Weathering
How much CO 2 can you sink in the ocean? Chemical Process that control CO 2 absorption in the ocean Biological Physical Carbon Cycle
Carbon Cycle
O 2 CO 2 p. H acid basic
Dissolved Gases in the Ocean Oxygen profile compensation depth Anoxic environment Respiration: Animal, plants and microbial decomposition
Dissolved Gases in the Ocean Oxygen profile
O 2 CO 2 p. H
The Carbonate System sources of inorganic carbon from dissolved CO 2 gas from dissolution of Calcium Carbonate NOTE: Biology and Physics participate in the equilibrium of the carbonate system
CO 2 in the ocean
Total dissolved inorganic carbon this is very small Total dissolved inorganic carbon not found in this form
(1) (2) formation and decomposition of organic matter from dissolution of Calcium Carbonate Total dissolved inorganic carbon
Carbon Dioxide and Carbonate system Carbonic Acid Bicarbonate Ion Carbonate
Carbon Dioxide and Carbonate system Contributes to Higher p. H + p. H - p. H Contributes to Lower p. H
Distribution of Carbon species in water + -
Control of p. H very rapid reaction in seawater at equilibrium Equilibrium constant hydrogen ion concentration
hydrogen ion concentration + -
Why is the p. H of seawater close to neutral? seawater p. H=7. 5 -8. 5
CO 2 changes in the last 50 yr Oceans Biosphere Rock Weathering
What control the absorption of Carbon Dioxide in the ocean? The carbonate system chemistry in seawater How can we measure it? The concept of alkalinity, p. H …
Atomic mass sodium 23 g/mol Atomic mass chloride 35. 5 g/mol
Def: Alkalinity: is the net molar concentration, in chargeequivalents, of the cations of strong bases in excess of the anions of strong acids Strong base cations Strong acid anions
What happens to this balance? Strong base cations Strong acid anions
Total dissolved inorganic carbon (2) Calcium Carbonate dissolution and formation -alkalinity Total dissolved inorganic carbon +alkalinity
Strong base cations Strong acid anions This excess of + charges turns out to be equal to the week acid anions of the carbonate system
Strong base cations Strong acid anions Bicarbonate and Carbonate Ions
Alkalinity can be measured by titration
What happens if I add or remove CO 2 by photosynthesis and respiration?
Carbon Dioxide and Carbonate system Carbonic Acid Bicarbonate Ion Carbonate
Strong base cations Strong acid anions Bicarbonate and Carbonate Ions recall:
Strong base cations Strong acid anions Bicarbonate and Carbonate Ions
Strong base cations Strong acid anions Bicarbonate and Carbonate Ions
hydrogen ion concentration + -
Control of p. H very rapid reaction in seawater at equilibrium Equilibrium constant hydrogen ion concentration
(1) (2) formation and decomposition of organic matter Calcium Carbonate dissolution and formation - acid -alkalinity +acid Total dissolved inorganic carbon +alkalinity
Carbon Cycle
- Slides: 44