Observational constraint on momentum flux-gradient relationships reduces modeling biases of PBL mixing of particles in urban area

Observational constraint on momentum flux-gradient relationships reduces modeling biases of PBL mixing of particles in urban area

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The momentum flux-gradient relationships within the urban roughness sublayer deviate from the classical relationships proposed by the Monin-Obukhov similarity theory.Despite this discrepancy, prevailing atmospheric models persistently rely on these classical relationships, which were originally derived from natural, homogeneous surfaces.This practice Hockey Skates - Intermediate - Rec may introduce significant errors when simulating urban atmospheric pollution.This study utilized meteorological parameters and turbulent fluxes obtained from field measurements in the urban roughness sublayer to re-establish momentum flux-gradient relationships.

Compared to non-urban areas, the flux-gradient relationships in Boys Trunks the urban environments exhibit significant deviations under stable conditions.Consequently, we revised a planetary boundary layer parameterization to incorporate new urban flux-gradient relationships.The revised scheme was implemented in the WRF-Chem model, and the simulation results demonstrated a marked reduction in modeling biases under stable conditions, particularly for relatively developed cities in Eastern China.