Planned HWRF Physics upgrades in 2016 1162022 EMC

  • Slides: 7
Download presentation
Planned HWRF Physics upgrades in 2016 1/16/2022 EMC HWRF weekily meeting 1

Planned HWRF Physics upgrades in 2016 1/16/2022 EMC HWRF weekily meeting 1

Module Highlights Improvements Surface Layer • Use 10 m wind to cal cd/ch o

Module Highlights Improvements Surface Layer • Use 10 m wind to cal cd/ch o independent of z grid o Better low level wind o Closer to observations PBL § Replace old GFSPBL with latest GFS-edmf PBL § Add obs-based K adjustment § Improve (2), remove discontinuity of K profile q Better representation of CBL/SBL q Better low level wind q Better simulation of storm intensification Convection Scale-aware deep/shallow convection scheme Represent multi-scale convection Horizontal diffusion Reduce horizontal length scale ~ 2/3 of that in 3 -km HWRF. Consistent with higher resolution Advect individual hydrometers good Ice physics Tech issue, next year tests not yet done Microphysics 1 adv Ferrier_hires 2 Thompson MP 1/16/2022 • • Remove empirical correction Update Cd, Ch for V >20 m/s EMC HWRF weekily meeting 2

Surface-layer Cd and Ch ü Reduce Cd for wind > 20 m/s ü Ch

Surface-layer Cd and Ch ü Reduce Cd for wind > 20 m/s ü Ch is reduced by 5% ü More consistent with Obs-derived Cd, Ch. ü Modify current z 0 ~ wind function; Use the standard 10 m wind to compute Cd, Ch through z 0. 1/16/2022 EMC HWRF weekily meeting 3

GFS PBL EDMF • Latest version GFS PBL Counter-gradient method to represent nonlocal flux

GFS PBL EDMF • Latest version GFS PBL Counter-gradient method to represent nonlocal flux HWRF 2015 HWRF 2016 Local Eddy 1/16/2022 EMC HWRF weekily meeting Mass Flux Also, TKE-based dissipation heating 4

K adjustment o Obs-based o Constant (with z) adjustment, simply multiply K by a

K adjustment o Obs-based o Constant (with z) adjustment, simply multiply K by a coefficient, discontinuous K, big impact on low-level wind. o Fix: height-dependent adjustment so that K is continuous. 1/16/2022 EMC HWRF weekily meeting 5

OLD NEW Upgraded HWRF generates more physically sensible structure. 1/16/2022 EMC HWRF weekily meeting

OLD NEW Upgraded HWRF generates more physically sensible structure. 1/16/2022 EMC HWRF weekily meeting 6

Scale-aware convection scheme • For cumulus convection, a scale-aware parameterization will be necessary for

Scale-aware convection scheme • For cumulus convection, a scale-aware parameterization will be necessary for the grid sizes of 500 m ~ 10 km where the strong updrafts are partially resolved. Scale function Based on Arakawa & Wu (2013): σu: updraft area fraction (0~1. 0) original cloud base mass flux from AS quasi-equilibrium closure updated cloud base mass flux with a finite σu 1/16/2022 EMC HWRF weekily meeting 7

2012 HWRF upgrades EMC HWRF team Features of2012 HWRF upgrades EMC HWRF team Features of
Transitioning HWRF upgrades into operations at EMC ATransitioning HWRF upgrades into operations at EMC A
HWRF Model Diagnostics Vijay Tallapragada HWRF Team LeadHWRF Model Diagnostics Vijay Tallapragada HWRF Team Lead
HWRF Cycling System Mingjings HWRF Analysis at tHWRF Cycling System Mingjings HWRF Analysis at t
Vortex Initialization in HWRF Vijay Tallapragada NOAANCEPEMC HWRFVortex Initialization in HWRF Vijay Tallapragada NOAANCEPEMC HWRF
Extending Operational HWRF Initialization to Triple nest HWRFExtending Operational HWRF Initialization to Triple nest HWRF