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SHiELD: System for High-resolution prediction on Earth-to-Local Domains

 

SHiELD is a Unified Forecast System (UFS) prototype atmosphere model showing the power of a unified prediction system across a variety of time and space scales designed for a wide array of applications. It shows the abilities of the Finite-Volume Cubed-Sphere Dynamical Core (FV3), especially its flexible nonhydrostatic dynamics, variable-resolution capabilities, and integrated physics, coupled with the elegance of the Flexible Modeling System (FMS) framework. Improvements in FV3 or the physics in SHiELD can be easily transferred into other FV3-based and UFS models, including the GFDL Modeling Suite and the Next-Generation Global Prediction System.

Configuration Use Domain Integration Length
SHiELD Medium-range weather prediction Global 13-km with 91 vertical levels 240 hours (10 days)
C-SHiELD Short-to-medium-range contiguous US severe weather prediction Global 20-to-9-km stretched, 3-km CONUS nest, 63 vertical levels 126 hours (5.25 days)
T-SHiELD Medium-range Atlantic tropical cyclone and hurricane prediction Global 13-km, 3.5-km tropical Atlantic nest, 63 vertical levels 168 hours (7 days), hurricane season only
S-SHiELD Subseasonal-to-seasonal prediction Global 25-km with 91 vertical levels 30 to 90 days, with up to 10 ensemble members
X-SHiELD eXperimental DYAMOND-class global cloud-resolving model (GCRM) Global 3.25-km with 79 vertical levels 40 days
R-SHiELD Regional limited-area model (LAM) configuration Regional 13, 3, or 1 km 54 hours

(Roman case indicates near real-time Tier 1 configurations; Italics indicate preliminary Tier 2 configurations not run in real-time)

 

In-Depth Information for Near Real-Time Configurations

 

2020 SHiELD Global Prediction System

 

SHiELD 2020 real-time: https://shield.gfdl.noaa.gov/?model=SHiELD_2020

Updated: August 5, 2020
Lead: Linjiong Zhou
Operator: Matt Morin
Contributors: Kun Gao, Lucas Harris, Mingjing Tong, and the GFDL FV3 Team

Initialized 00Z and 12Z daily from operational GFSv15 analyses
Integrated to 10 days
Horizontal Resolution: 13-km global domain (C768)
Vertical Resolution: 91 layers, lowest mid-level at ~12 m, model top at 40 Pa
Computational Performance: 80 min/10 days using 3072 cores on Gaea C4

2020 FV3 Dynamical Core:

  • Nonhydrostatic Lagrangian Dynamics
  • Positive-definite Tracer Advection
  • GFDL 2020 Inline Cloud Microphysics

2020 SHiELD (GFS) Physics Package:

  • TKE-EDMF Planetary Boundary Layer with GFDL 2020 updates
  • NCEP 2017 Scale-Aware SAS (shallow and deep) Convection
  • RRTM Radiation and 2020 GFDL cloud-radiation interaction
  • GFS (orographic and convective) Gravity Wave Drag with GFDL 2018 updates

SHiELD Ocean Component:

  • 2019 Mixed-layer Ocean Model
  • GFDL ocean surface roughness parameterization

SHiELD (GFS) Land Component:

  • High-resolution Noah Land Model with GFDL 2019 updates
References:

 

2020 C-SHiELD Global-to-Regional CONUS Prediction System

 

C-SHiELD 2020 real-time: https://shield.gfdl.noaa.gov/?model=C-SHiELD_2020

Updated: April 25, 2020
Lead: Lucas Harris
Operator: Matt Morin
Contributors: Linjiong Zhou, Kai-Yuan Cheng, and the GFDL FV3 Team

Initialized 00Z and 12Z daily from operational GFSv15 analyses
Integrated to 5.25 days
Horizontal Resolution: 20-to-8.5-km stretched global domain (C768r15), 3-km CONUS nested domain (2016 x 1080 grid cells)
Vertical Resolution: 63 layers, lowest mid-level at ~15 m, model top at 64 Pa
Computational Performance: 94 min/5.25 days using 3420 cores on Gaea C4

2020 FV3 Dynamical Core:

  • Positive-definite Tracer Advection
  • GFDL 2020 Inline Cloud Microphysics with hail on nest
  • Two-way grid nesting with simplified two-way update
  • Re-configured implicit and explicit horizontal diffusion

2019 SHiELD (GFS) Physics Package:

  • YSU Planetary Boundary Layer with GFDL 2019 updates
  • NCEP 2017 Scale-Aware SAS (shallow and deep) Convection; deep convection on global domain only
  • RRTM Radiation with bugfix and 2019 GFDL cloud-radiation interaction
  • GFS (orographic and convective) Gravity Wave Drag with GFDL 2018 updates; convective GWD on global domain only

SHiELD Ocean Component:

  • 2019 Mixed-layer Ocean Model

SHiELD (GFS) Land Component:

  • High-resolution Noah Land Model with GFDL 2019 updates
References:
  • Potvin, C K., J R Carley, A Clark, L J Wicker, P S Skinner, A E Reinhart, B T Gallo, J S Kain, G Romine, E Aligo, K Brewster, D C Dowell, and Lucas Harris, et al., October 2019: Systematic comparison of convection-allowing models during the 2017 NOAA HWT Spring Forecasting Experiment. Weather and Forecasting, 34(5), doi:10.1175/WAF-D-19-0056.1.
  • Harris, Lucas, Shannon L Rees, Matthew J Morin, Linjiong Zhou, and William F Stern, June 2019: Explicit prediction of continental convection in a skillful variable‐resolution global model. Journal of Advances in Modeling Earth Systems, 11(6), doi:10.1029/2018MS001542.
  • Zhang, C, M Xue, T A Supinie, F Kong, N Snook, K W Thomas, K Brewster, Y Jung, Lucas Harris, and Shian-Jiann Lin, March 2019: How Well Does an FV3-based Model Predict Precipitation at a Convection-Allowing Resolution? Results from CAPS Forecasts for the 2018 NOAA Hazardous Weather Testbed with Different Physics Combinations. Geophysical Research Letters, 46(6), doi:10.1029/2018GL081702.

 

2020 T-SHiELD Global-to-Regional Tropical Nested Prediction System

 

T-SHiELD 2020 real-time (no longer being run): https://shield.gfdl.noaa.gov/?model=T-SHiELD_2020

Updated: May 1, 2020
Lead: Kun Gao
Operator: Matt Morin
Contributors: Morris Bender, Lucas Harris, Linjiong Zhou, and the GFDL FV3 Team

Initialized every six hours (00, 06, 12, and 18Z) from operational GFSv15 analyses
Integrated to 7 days
Horizontal Resolution: 13 km uniform global domain (C768r10), 3-km North Atlantic nested domain (2304 x 1152 grid cells)
Vertical Resolution: 79 layers, lowest mid-level at ~15 m, model top at 64 Pa
Computational Performance: 209 min/7 days using 3072 cores on Gaea C3

2020 FV3 Dynamical Core:

  • Nonhydrostatic Lagrangian Dynamics
  • GFDL 2020 Inline Cloud Microphysics
  • Hord 6 for horizontal advection of dynamical quantities
  • Hord -5 (positive-definite) for tracers

2019 SHiELD (GFS) Physics Package:

  • YSU Planetary Boundary Layer with GFDL 2019 updates
  • NCEP Scale-Aware SAS Shallow Convection (Deep Convection OFF)
  • RRTM Radiation with bugfix and 2019 GFDL cloud-radiation interaction

SHiELD Ocean Component:

  • 2019 Mixed-layer Ocean Model
  • GFDL ocean surface roughness parameterization

SHiELD (GFS) Land Component:

  • High-resolution Noah Land Model with GFDL 2019 updates
References:
  • Gao K., L. Harris, L. Zhou, M. Bender, M. Morin, 2020: On the sensitivity of hurricane intensity and structure to horizontal tracer advection schemes in FV3, in review (JAS)
  • Hazelton, Andrew T., Lucas Harris, and Shian-Jiann Lin, April 2018: Evaluation of Tropical Cyclone Structure Forecasts in a High-Resolution Version of the Multiscale GFDL fvGFS Model. Weather and Forecasting, 33(2), doi:10.1175/WAF-D-17-0140.1.
  • Hazelton, Andrew T., Morris A Bender, Matthew J Morin, Lucas Harris, and Shian-Jiann Lin, October 2018: 2017 Atlantic Hurricane Forecasts From a High-Resolution Version of the GFDL fvGFS Model: Evaluation of Track, Intensity, and Structure. Weather and Forecasting, 33(5), doi:10.1175/WAF-D-18-0056.1.

 

References for Experimental Configurations

 

2020 S-SHiELD Subseasonal-to-Seasonal Prediction System

 

S-SHiELD is a lower-resolution configuration of SHiELD intended for Subseasonal-to-Seasonal (S2S) simulation, intended for extended-range prediction with a focus on extreme weather events. S-SHiELD is currently under development.

 

GFDL X-SHiELD eXperimental GCRM

 

X-SHiELD is an eXperimental Global Cloud Resolving Model (GCRM) run at a sufficiently high global resolution to explicitly simulate individual convection cells. X-SHiELD is GFDL’s contribution to the DYAMOND project, an international intercomparison of GCRMs. We are also collaborating with Vulcan Climate Modeling to accelerate X-SHiELD using emerging computing platforms, and to train a Machine Learning system on the output to create an efficient emulator of the expensive GCRM.

References:

 

2020 R-SHiELD Regional Domain

 

R-SHiELD is a developmental system for applications of SHiELD on non-global domains. The Environmental Modeling Center of the National Centers for Environmental Prediction (NCEP) has implemented a Limited-Area Modeling (LAM) capability within FV3. This capability permits efficient short-term, high-resolution simulation for problems in which the overhead of a global model is unnecessary or unwanted, including the regional variant of the Hurricane Analysis and Forecast System and the Rapid-Refresh Forecast System. A doubly-periodic domain is also available in FV3 for idealized simulation.

References:
  • Held, Isaac M., Ming Zhao, and Bruce Wyman, January 2007: Dynamic radiative-convective equilibria using GCM column physics. Journal of the Atmospheric Sciences, 64(1), 228-238.
  • Jeevanjee, Nadir, October 2017: Vertical velocity in the gray zone. Journal of Advances in Modeling Earth Systems, 9(6), DOI:10.1002/2017MS001059.
  • Anber, Usama, Nadir Jeevanjee, Lucas Harris, and Isaac M Held, July 2018: Sensitivity of Radiative‐Convection Equilibrium to Divergence Damping in GFDL‐FV3 Based Cloud‐Resolving Model Simulations. Journal of Advances in Modeling Earth Systems, 10(7), DOI:10.1029/2017MS001225.
  • Wing, Allison A., Levi G Silvers, Ming Zhao, and coauthors, September 2020: Clouds and Convective Self-Aggregation in a Multi-Model Ensemble of Radiative-Convective Equilibrium Simulations. Journal of Advances in Modeling Earth Systems, 12(9), DOI:10.1029/2020MS002138.