Inline coupling of simple and complex chemistry modules within the global weather forecast model FIM (FIM-Chem v1)
<p>The global Flow-following finite-volume Icosahedral Model (FIM), which was developed in the Global Systems Laboratory (GSL) of NOAA, has been coupled inline with aerosol and gas-phase chemistry schemes of different complexity using the chemistry and aerosol packages from WRF-Chem v3.7, name...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-01-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://gmd.copernicus.org/articles/15/467/2022/gmd-15-467-2022.pdf |
| Summary: | <p>The global Flow-following finite-volume Icosahedral Model (FIM), which was developed in the Global Systems Laboratory (GSL) of NOAA, has been
coupled inline with aerosol and gas-phase chemistry schemes of different complexity using the chemistry and aerosol packages from WRF-Chem v3.7,
named FIM-Chem v1. The three chemistry schemes include (1) the simple aerosol modules from the Goddard Chemistry Aerosol Radiation and Transport
model that includes only simplified sulfur chemistry, black carbon (BC), organic carbon (OC), and sectional dust and sea salt modules (GOCART);
(2) the photochemical gas phase of the Regional Atmospheric
Chemistry Mechanism (RACM) coupled to GOCART to determine the impact of more realistic gas-phase chemistry on the GOCART
aerosol simulations (RACM_GOCART); and (3) a further sophistication within the aerosol modules by replacing GOCART with a modal aerosol scheme
that includes secondary organic aerosols (SOAs) based on the volatility basis set (VBS) approach (RACM_SOA_VBS). FIM-Chem is able to simulate aerosol, gas-phase chemical
species, and SOA at various spatial resolutions with different levels of complexity and quantify the impact of aerosol on numerical weather
prediction (NWP). We compare the results of RACM_GOCART and GOCART schemes which use the default climatological model fields for <span class="inline-formula">OH</span>,
<span class="inline-formula">H<sub>2</sub>O<sub>2</sub></span>, and <span class="inline-formula">NO<sub>3</sub></span>. We find significant reductions of sulfate that are on the order of 40 % to 80 % over the eastern US
and are up to 40 % near the Beijing region over China when using the RACM_GOCART scheme. We also evaluate the model performance by comparing it
with the Atmospheric Tomography Mission (ATom-1) aircraft measurements in the summer of 2016. FIM-Chem shows good performance in capturing the aerosol and
gas-phase tracers. The model-predicted vertical profiles of biomass burning plumes and dust plumes off western Africa are also reproduced
reasonably well.</p> |
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| ISSN: | 1991-959X 1991-9603 |