Harmonized Emissions Component (HEMCO) 3.0 as a versatile emissions component for atmospheric models: application in the GEOS-Chem, NASA GEOS, WRF-GC, CESM2, NOAA GEFS-Aerosol, and NOAA UFS models

Abstract. Emissions are a central component of atmospheric chemistry models. The Harmonized Component (HEMCO) is software for computing emissions from user-selected ensemble emission inventories and algorithms. It allows users to re-grid, combine, overwrite, subset, scale different through configuration file with no change the model source code. also maps species appropriate units. HEMCO can operate in offline stand-alone mode, but more importantly it provides an online facility models compute at runtime. complies Earth System Modeling Framework (ESMF) portability across We present new version here, 3.0, that features improved three-layer architecture facilitate implementation into any capability calculating resolution including multiscale unstructured grids. 3.0 includes (1) Data Input Layer reads accesses library other environmental data, (2) Core computes on grid, (3) Model Interface re-grids (if needed) serves data dependent state (such as dust or vegetation). common all models, while adaptable environment. Default versions enable straightforward simple architecture, options available disable such re-gridding may be done by independent couplers complex architectures. algorithms continuously enriched user contributions so immediately shared serve general broker process input not only gridded datasets. describe existing implementations GEOS-Chem “Classic” chemical transport shared-memory infrastructure, high-performance (GCHP) distributed-memory NASA GEOS (GEOS ESM), (4) Weather Research Forecasting (WRF-GC), (5) Community Version 2 (CESM2), (6) NOAA Global Ensemble Forecast – Aerosols (GEFS-Aerosols), well planned Unified (UFS). Implementation CESM2 contributes Multi-Scale Infrastructure Chemistry (MUSICA) providing infrastructure support simulations scales.