Mass-Conservation Issues in Modelling Regional Aerosols

摘要: The problem of using mass-inconsistent winds in tracer advection is relatively well recognized the air quality modelling community. As pointed out by (1999), an inconsistency air-density and wind fields equivalent to additional source term continuity equation, which will lead mass-conservation violation models. There are a number causes mass input air- density for For example, equation not always included as one prognostic equations meteorological models, then diagnostic variable; staggering space time grids models momentum thermal variables can affect accuracy solution equation; furthermore, de-staggering (AQ) also introduce inconsistency. Various methods (both formal ad hoc) have been used practice correct error introduced winds. This usually involves corrections make them consistent (e.g., Odman Russell, 1999) adjustment through correction Lu et al., 1997). (1999) suggested ways correcting mass-inconsistency based on analysis his formulated generalised coordinate system.