SH003-0005
The NCEP FV3 Whole Atmospheric Modeling for UFS Space Weather Application
Monday, 7 December 2020
Poster
Hann-Ming H Juang, National Centers For Environmental Prediction-Environmental Modeling Center, College Park, MD, United States, Sajal K Kar, I.M. SYSTEMS GROUP, INC., College Park, MD, United States, Adam Kubaryk, CIRES, University of Colorado Boulder; Space Weather Prediction Center, NCEP, NOAA, Boulder, MD, United States and Vijay Tallapragada, NOAA/NCEP/EMC, College Park, MD, United States
Abstract:
The NCEP Environmental Modeling Center (EMC) has developed a whole atmosphere model (WAM), and will be coupled with space weather models for NCEP operational implementation early next year. The EMC WAM dynamics was based on a version of the GSM with a generalized vertical coordinate using enthalpy as the prognostic thermodynamics variable (Juang 2011), and an extended model top to 10-7 Pa (400-600 km). In addition to the enthalpy version of GSM dynamics, other components including upper-atmospheric model physics and WAM data assimilation have been implemented into this operational package for space weather applications.
Based on the same concept, we have vertically extended the FV3 domain to form an initial version of FV3 WAM. In order to preserve the original FV3 discretization, a multi-gas concept replaced the enthalpy thermodynamics to maintain the distribution and variation of atmospheric constituents covering whole atmosphere from troposphere to thermosphere, and three-dimensional molecular diffusion to reduce Rayleigh damping for stability during longer model integration. Thus, the EMC FV3 WAM meets the needs of the UFS space weather application. We will present some model performances of FV3 WAM in the meeting.
Reference:
Juang, H.-M. H., 2011: A multiconserving discretization with enthalpy as thermodynamic prognostic variable in generalized hybrid vertical coordinates for the NCEP global forecast system. Mon Wea Rev, 139, 1583-1607.
