Table 3 Constants used to calculate Fe dissolution rates for pyrogenic aerosols in IMPACT model102 and CAM515.

From: Ocean fertilization by pyrogenic aerosol iron

Dissolution scheme

Model

Rate constant Ki(T)a

mic

Ajd

Proton-promoted

IMPACT

3.05 × 10−9 × exp[E(pH)b × (1/298 − 1/T)]

0.36

0.8

 

CAM5

1.3 × 10−11 × exp[9.2 × 103 × (1/298 − 1/T)]

0.39

90

Oxalate-promoted

IMPACT

2.24 × 10−7 × exp[E(pH)b × (1/298 − 1/T)]

1

0.8

 

CAM5

2.3 × 10−7 × [oxalate] + 4.8 × 10−7

  

Photoinducede

IMPACT

2.39 × 10−7exp[E(pH)b × (1/298 − 1/T)]

1

0.8

  1. aKi(T) is the reaction coefficient (moles m−2 s−1) for each dissolution scheme i.
  2. bE(pH) = −1.56 × 103 × pH + 1.08 × 104.
  3. cmi is the reaction order with respect to aqueous phase protons.
  4. dAj is the specific surface area of Fe species in units of m2 g−1.
  5. eThe photoinduced dissolution rate of Fe compounds is scaled to the photolysis rate of H2O2 calculated in the model.
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