Justin GlisanIowa State University

Department of Geological and Atmospheric Sciences

RACM Project Update: ISU Atmospheric Modeling Component:

Part 1

5th DOE/RACM Meeting: Santa Cruz, CA 1Justin Glisan, Iowa State University

Outline• Update since San Diego• Extended SHEBA Year run– Full and embedded domains– Time series/Plots

• Production runs– Experimental Design – Replication (spatial and temporal)– Ensembles

• Future Work/PhD Research

2Justin Glisan, Iowa State University

Update since San Diego

• Production WRF runs by WRF 3.1– Incorporates various parameterizations designed

for the Arctic (Mark Seefeldt’s SD presentation)– Extended SHEBA year run (five years)• Full domain analysis • Sub-domain analysis for large watersheds and central

Arctic Ocean

• Elements of experimental design dealing with statistical significance and replication

Pan-Arctic WRF Setup

Using physics parameterizations tested at the University of Colorado

4Justin Glisan, Iowa State University

PAW

• WRF (ARW dynamic core) version 3.1• Pan-Arctic Domain• Colorado Physics Parameterizations• Forcing data sets:– NCEP/DOE R2– NSIDC Bootstrap Fractional Sea Ice

Justin Glisan, Iowa State University 5

6Justin Glisan, Iowa State University

PAW Model Runs

Extended SHEBA Run19792001

4th DOE/RACM Meeting: San Diego, CA 7Justin Glisan, Iowa State University

Present Day Climatology

• In an effort to study the past 30 years, three distinct five-year periods selected

• Literature and statistical review shows an ensemble containing from four to six members reasonable– Seven year spin-up (two years for soil, etc.)– Final five years used– Members created 24 hours apart

• Experimental design…

Extended SHEBA Year Test Case

• September 1997 – September 2001 (+)– Initial run extended into February 1999– Will have ensembles

• Results compared against:– NCEP/DOE R2– ECMWF ERA40– SHEBA Observations*

4th DOE/RACM Meeting: San Diego, CA Justin Glisan, Iowa State University 9