GEFS-Aerosol - EMC
BACKGROUND
The NEMS coupled app (GFS-CHEM) includes two components: The NCEP Global Forecast System ( GFS V15 ) and GSDCHEM. GSDCHEM is a National Unified Operational Prediction Capability ( NUOPC ) based chemistry component developed to replace the current NEMS GFS Aerosol Component (NGAC at 1x1°, Wang, et al. 2018) GSDCHEM includes the WRF-Chem (Grell, et al. 2005) chem_driver with updates for consistency with the NASA Goddard Operational Chemistry and Aerosol Radiation and Transport (GOCART; Chin, et al. 2007) version. The chemistry and aerosol modules used for GFS-CHEM include simple sulfur chemistry, hydrophobic and hydrophilic black and organic carbon, and a 5-bin sea salt module. Additionally, included is the FENGSHA (Dong, et al. 2016) 5-bin dust module, wildfires modeling using Fire Radiative Power (FRP) and smoke emissions from the NESDIS Global Biomass Burning Emissions Product (GBBEPx; Zhang, et al., 2014; Zhang, et al., 2012). Plume rise modeling is done with a 1-d cloud model (Grell et al, 2011), and, optionally, volcanic ash emissions are also included. The global anthropogenic emission is from the Community Emissions Data System (CEDS) based on 2014 inventory. Tracers are transported by the dynamics as well as the GFS physics (GFS PBL and Simple Arakowa Shubert (SAS) deep and shallow convection parameterization). Subgrid scale wet scavenging and transport is done inside the two SAS routines.
The system runs at FV3 cube sphere C384L64 resolution (~25 km) in the NCEP Global Ensemble Forecast System (GEFS) production suite, but with GOCART simple aerosol chemistry (20 species) run to 120 forecast hours four times per day. GFS-Chem currently requires 40 nodes to run 5 days in 37 cpu minutes on the Dell Phase III systems.
Technically, coupling occurs two-way, as mixing ratios of chemical tracers are exchanged between FV3GFS and GSDCHEM at each coupling step to be advected by FV3 dynamical core. However, at this point coupling is considered to be only one way in this milestone from a scientific standpoint, since feedback to the meteorology is not yet activated.
At each coupling time step, a complete set of fields is provided by FV3GFS to GSDCHEM, which includes them in chemistry computations and returns updated mixing ratios for the chemical tracers to FV3GFS. Tracer concentrations and some diagnostic chemical output are included in FV3GFS history files.
All 2D and 3D fields exported by FV3GFS are initialized using baseline input data provided for regression testing. FV3 data structures (IPD_Data) corresponding to these fields are shown in Table 1 . 19 chemical tracers are defined in the FV3GFS input field_table file with a spatially constant non-zero value at the surface. These tracers are also added to the diag_table file to be included in FV3GFS dynamics history files.
More information is available from the following links:
- Operational GEFS-Aerosol forecast guidance graphics
- Operational GEFS-Aerosol gridded products via the NCEP NOMADS server or the NCEP FTP server.
- Partha Bhatacharjee, NCEP/EMC AMS 2020 presentation
- Rick Saylor’s, NOAA/ARL, ICAP 2019 presentation
- GEFS-Aerosols development history
- GFS-Aerosols Real-time Forecasts
- GFS-Aerosol evaluation web graphics
Global Aerosol modeling community users :
- ICAP : International Centers for Aerosol Prediction (ICAP)
- WMO SDS-WAS (WMO Sand and Dust Storm-Warning and Advisory System)
- Global Air Quality Index project (Singapore Met offic )
- WMO VFSP-WASL (WMO Vegetation Fires and Smoke Pollution Warning System)
EVALUATION
GEFS-Aerosols retrospectives are run from March 2019 and ending March 2020. Evaluations against the ATOM-1 2016 field experiment have already been performed by NOAA/OAR. Evaluation followed previous NGAC protocols (Bhattacharjee, et al. 2018) and are available here . The following fields are evaluated daily by comparing model outputs to
- MODIS satellite AOD 1° gridded product
- VIIRS satellite AOD 0.25° degree gridded product
- AERONET AOD especially stations near dust and smoke sources
- International Centers for Aerosol Prediction (ICAP) ensemble forecast - 1° total and dust AOD
- NASA GEOS-5/MERRA-II gridded total AOD and speciated analyses ( SO4, dust, OC, BC)
- Global PM2.5 and PM10 surface measurements
- Monthly compared Calipso aerosol profiles
The evaluation web site included daily and monthly averaged comparisons to above observations/analyses of
- Gridded AOD RMSE,BIas and correlation on global and regional maps
- diurnal and daily time series at AERONET sites
October 2022 GEFS-Aerosols Changes
The minor implementation of the GEFS-Aerosols version 12.3 scheduled for October 2022 includes the following upgrades and bug fixes:
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Fengsha dust parameterization bug fix.
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Update to anthropogenic emissions from CEDS-2014 to CEDS-2019 base year.
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Fix a bug in Unified Post Processor (UPP) Aerosol Optical Depth (AOD) calculation that resulted in overestimates of AOD.
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Adjust aerosol physics (aerosol large-scale precipitation and convective wet scavenging removal) to improve aerosol quality forecasts.
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Output dust PM10 (Particulate Matter of 10 micron or less size) at the surface.
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Improvement in the GBBEPx smoke Organic Carbon emission process
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In addition to the above updates made to the single GEFS-Aerosol member, cloud ceiling (geopotential meters), surface visibility (meters), and surface frozen precipitation fraction (percent) from all GEFS ensemble members are also added to the 0.25-deg atmospheric products for distribution through NOMADS.
GEFS-Aerosols Output
Outputs will be in grib2 and include the same fields currently output by NGAC but at a finer 0.25 degree resolution. These fields will include:
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Chin, M., Diehl, T., Ginoux, P., and Malm, W. (2007). Intercontinental transport of pollution and dust aerosols: implications for regional air quality, Atmos. Chem. Phys., 7, 5501–5517, https://doi.org/10.5194/acp-7-5501-2007
Dong, X., Fu, J. S., Huang, K., Tong, D., and Zhuang, G., (2016). Model development of dust emission and heterogeneous chemistry within the Community Multiscale Air Quality modeling system and its application over East Asia, Atmos. Chem. Phys., 16, 8157–8180, https://doi.org/10.5194/acp-16-8157-2016.
Grell, G.A. ,S.E. Peckham, R. Schmitz and S.A McKeen, G. Frost, W. Skamrock, B. Eder (2005). Fully coupled online chemistry within the WRF model: description and applications. Atmos. Envir. 39, 6957-6975. https://doi.org/10.1016/j.atmosenv.2005.04.027
Grell, G. A., & Freitas, S. R., Stuefer, M., and J. D. Fast (2011). Inclusion of biomass burning in WRF-Chem: Impact on wildfires on weather forecasts. Atmospheric Chemistry and Physics , 11,5289– 5303. https://doi.org/10.5194/acp-11-5289-2011
Hoesly, R. M., Smith, S. J., Feng, L., Klimont, Z., Janssens-Maenhout, G., Pitkanen, T., Seibert, J. J., Vu, L., Andres, R. J., Bolt, R. M., Bond, T. C., Dawidowski, L., Kholod, N., Kurokawa, J.-I., Li, M., Liu, L., Lu, Z., Moura, M. C. P., O’Rourke, P. R., and Zhang, Q.: Historical (1750–2014) anthropogenic emissions of reactive gases and aerosols from the Community Emissions Data System (CEDS), Geosci. Model Dev., 11, 369-408, https://doi.org/10.5194/gmd-11-369-2018 , 2018.
Wang, J., Bhattacharjee, P. S., Tallapragada, V., Lu, C.-H., Kondragunta, S., da Silva, A., Zhang, X., Chen, S.-P., Wei, S.-W., Darmenov, A. S., McQueen, J., Lee, P., Koner, P., and Harris, A. (2018). The implementation of NEMS GFS Aerosol Component (NGAC) Version 2.0 for global multispecies forecasting at NOAA/NCEP – Part 1: Model descriptions, Geosci. Model Dev., 11, 2315–2332, https://doi.org/10.5194/gmd-11-2315-2018 .
Zhang, X., Kondragunta, S., Ram, J., Schmidt, C., and Huang, H.C. (2012). Near-real-time global biomass burning emissions product from geostationary satellite constellation, Journal of Geophysical Research, 117, D14201, doi:10.1029/2012JD017459.
Zhang, X., Kondragunta, S., da Silva, A., Lu, S., Ding, H., Li, F., and Zhu, Y.: The blended global biomass burning emissions product from MODIS and geostationary satellites (GBBEPx), http://www.ospo.noaa.gov/Products/land/ gbbepx/docs/GBBEPx_ATBD.pdf (last access: 1 June 2018), 2014