Carbon cycle theme #1 The Earth’s carbon cycle has a stabilizing mechanism against sudden addition of CO 2 to the atmosphere – About 50% of carbon emission.

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Presentation transcript:

Carbon cycle theme #1 The Earth’s carbon cycle has a stabilizing mechanism against sudden addition of CO 2 to the atmosphere – About 50% of carbon emission is absorbed into land and ocean surfaces – Climate warming would be twice as severe if there were no such carbon sink – Ocean carbon uptake is helpful but it comes with certain consequences: ocean acidification

Ocean carbon cycle (2) CO 2 + CO H 2 O 2HCO 3 -

Carbonate chemistry DIC = [CO 2 *] + [HCO 3 - ] + [CO 3 2- ]

What is pH? pH = -log 10 [H + ] – Lower pH value indicate increasing acidity Notation: pX = -log 10 X – Potential of X – Logarithmic scale: If pH decreases by 1, it’s a factor of ten increase in acidity

What controls the pH of seawater? Ions in the seawater – Cations and anions – Na +, Mg 2+, Ca 2+, K +, Cl -, F -, SO 4 2-, NO 3 -, HCO 3 -, CO 3 2-, H +, OH -, B(OH) 4 -, etc… Charge balance – The charge-weighted sum of positively and negatively charged ions must be zero. Alkalinity – The net positive charge from strong ions

Strong base cations (less) strong acid anions Alkalinity: is the net molar concentration, in charge- equivalents, of the cations of strong bases in excess of the anions of strong acids Definition of Alkalinity Weak acid anions

Approximate relation

DIC = [CO 2 *] + [HCO 3 - ] + [CO 3 2- ] Alk = [HCO 3 - ] + 2[CO 3 2- ]