1. GEOS-5 Data Assimilation System Updates
Andrea Molod
GMAO Staff

2. GEOS FP system major upgrade on January 24, 2017:
e5131fp  f516fp
Transition from Hybrid 3D-Var to Hybrid 4D En-Var assimilation system
Doubled horizontal resolution from ~25 km to ~12.5-km
Re-tuning of many aspects of moist physics
Aerosol module (GOCART) now includes nitrates
Led to improvements in forecast skill score
Note: present GEOS FP file specification is unchanged from previous system. Upcoming system changes will include output on the cubed sphere grid at a horizontal resolution to be determined.

3. Improvements in forecast skill score
RMS Error
RMS Error
Anomaly Corr
f e5131
Anomaly Corr
Anomaly Corr
Anomaly Corr

4. Transition from Hybrid 3D-Var to Hybrid 4D En-Var
Surface U analysis increment: Single obs case
3DVar
Hybrid 3D-Var
Hybrid 4D-EnVar
-3h h h
-3h h h
-3h h h
Courtesy of: Amal El Akkraoui

5. Re-tuning of many aspects of moist physics
Diff
Conv Mass Flux
Conv Mass Flux at 800 mb

6. Re-tuning of many aspects of moist physics
Diff
Cloud Fraction
Cloud Ice Content

7. Re-tuning of many aspects of moist physics Short-Wave Diabatic Heating
Diff
Short-Wave Diabatic Heating
Specific Humidity

8. Implications of change in moist physics
Diff
V-wind
PBL Height

9. Re-tuning of many aspects of moist physics
Cloud Top Pressure

10. GEOS-5 Systems
WIKI page - General user information and links: geos5.org
GMAO at IGC8:
Steven Pawson - Head of Office
Andrea Molod
Clara Orbe
Christoph Keller