Table A2.

Biogeochemical Source/Sink Terms at the Bottom (Sediment) Boundary

Variable	Processes	Time Rate of Change in Each Term
Small Detritus (DS)	Change per unit time =	∂D S/∂t|z = H =
	+ total organic matter (DL + DS + P → DS)	$+\frac{{\varphi }_1}{\mathrm{\Delta }z}{F}_{\text{TON}}$
Semilabile Dissolved Organic Nitrogen [DON]SL	Change per unit time =	∂[DON]SL/∂t|z = H =
	+ Remineralization of unresuspended and unburied through coupled nitrification and denitrification (DL + DS + P → [DON]SL)	$+{\gamma }_{{\left[\text{BDON}\right]}_{\mathrm{S}\mathrm{L}}}\frac{\left(1-{\varphi }_1\right)\left(1-{\varphi }_2\right)}{\mathrm{\Delta }z}{F}_{\text{TON}}\left(1+3L_{{\text{BO}}_2}\right)$
Ammonium [NH4]	Change per unit time =	∂[NH4]/∂t|z = H =
	+ Remineralization of unresuspended and unburied through coupled nitrification and denitrification ((DL + DS + P → [NH4])	$+{\eta }_{\mathrm{N}\mathrm{F}/\mathrm{D}\mathrm{N}\mathrm{F}}\frac{\left(1-{\varphi }_1\right)\left(1-{\varphi }_2\right)}{\mathrm{\Delta }z}{F}_{\text{TON}}\left(1+3L_{B{\mathrm{O}}_2}\right)$
Oxygen [O2]	Change per unit time =	∂[O 2]/∂t|z = H =
	+ Remineralization of unresuspended and unburied through coupled nitrification and denitrification	$-{\eta }_{{\mathrm{O}}_2:\mathrm{N}\mathrm{F}/\mathrm{D}\mathrm{N}\mathrm{F}}\frac{\left(1-{\varphi }_1\right)\left(1-{\varphi }_2\right)}{\mathrm{\Delta }z}{F}_{\text{TON}}\left(1-L_{{\text{BO}}_2}\right)$
Inorganic suspended solid [ISS]	Change per unit time =	∂[ISS]/∂t|z = H =
	+ Resuspended inorganic matter	ξ(Γ|z = H − Γc)