Solid-Phase

A solid-phase aerosol species placeholder in the ISORROPIA II inorganic thermodynamic equilibrium model. Holds the molarity of a single solid salt in air. In isolation the concentration is conserved (D(M)/dt = 0); source and sink terms are added through the coupling mechanism when Solid instances are composed into the full Isorropia system. Reference: Fountoukis and Nenes (2007), ISORROPIA II.

Aggregate container for the 19 solid-phase salt species in the ISORROPIA II inorganic thermodynamic equilibrium model. Composes 19 named Solid instances — one per solid salt that can form in the K⁺-Ca²⁺-Mg²⁺-NH₄⁺-Na⁺-SO₄²⁻-NO₃⁻-Cl⁻-H₂O system — into a single subsystem bundle. Each Solid carries a single state variable M(t) [mol/m³] representing the molarity of that salt in air; in isolation M is conserved (D(M)/dt = 0). Source/sink terms are injected through the coupling mechanism when Solids is composed into the parent Isorropia system. Reference: Fountoukis and Nenes (2007), ISORROPIA II.