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ASM Project Update: Atmospheric Modeling

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1 ASM Project Update: Atmospheric Modeling
John J. Cassano and Mark W. Seefeldt University of Colorado Cooperative Institute for Research in Environmental Sciences Department of Atmospheric and Oceanic Sciences

2 Goals for Year 1 of DOE Project
Develop and evaluate Polar WRF Univ. of Colorado Sub-contract to Bromwich / Hines - OSU Coupling of WRF to CCSM cpl7 Lead by Juanxiong He, UAF

3 Strategy for Polar WRF Development
Use lessons from development of Polar MM5 Identify parameterizations that are well-suited for polar use Preference for parameterizations that are most physically realistic Add “missing” physics Collaboration with several research groups OSU / BPRC NOAA ESRL NCAR University of Colorado

4 Polar WRF Evaluation Evaluate over a variety of polar surface types
Ice sheet (Hines / Bromwich - Greenland) Sea ice / ocean (Hines / Bromwich and CU - SHEBA) Implementation of fractional sea ice treatment (OSU) Non-ice covered land Evaluate atmospheric state Evaluate atmospheric processes Are we getting the right answer for the right reasons? Initial work at University of Colorado Identify parameterizations that are inappropriate for polar use Identify “ideal” suite of model parameterizations Identify aspects of model in need of improvement

5 SHEBA Simulations Simulations during SHEBA year Model forcing (CU)
January and June 1998 (CU) - climate mode January, June, and August 1998 (OSU) - forecast mode Model forcing (CU) ECMWF TOGA atmospheric data and SST ERA40 sea ice and soil state Model grid (CU) 50 km horizontal 31 vertical levels Model top: 50 mb

6 WRF Physics Land surface: Noah (Thermal diffusion)
Longwave radiation: RRTM Shortwave radiation: Goddard (Dudhia) Boundary layer: YSU (MYJ) Microphysics: Morrison (WSM5) Cumulus: Kain-Fritsch (Grell-Devenyi) Bromwich / Hines have used a slightly different selection of model physics for their Greenland and SHEBA simulations

7 Shortwave Radiation: Goddard and Dudhia
June 1998 Goddard SW RRTM LW WSM5 MP KF CU YSU PBL Noah LSM Dudhia SW

8 Land surface: Noah LSM and thermal diffusion
January 1998 Noah LSM Dudhia SW RRTM LW WSM5 MP KF CU YSU PBL Thermal diffusion model

9 Cumulus: Kain-Fritsch and Grell-Devenyi
June 1998 Kain-Fritsch Goddard RRTM LW Morrison MP MYJ PBL Noah LSM Grell-Devenyi

10 Cumulus: Kain-Fritsch and Grell-Devenyi
June 1998 Kain-Fritsch Goddard RRTM LW Morrison MP MYJ PBL Noah LSM Grell-Devenyi

11 Cumulus: Kain-Fritsch and Grell-Devenyi
June 1998 Kain-Fritsch Goddard RRTM LW Morrison MP MYJ PBL Noah LSM Grell-Devenyi

12 Boundary Layer: YSU and MYJ
January 1998 YSU Goddard RRTM LW Morrison MP KF CU Noah LSM MYJ

13 Cloud Microphysics: Morrison and WSM5
January 1998 Morrison Goddard RRTM LW KF CU YSU PBL Noah LSM WSM5

14 Cloud Microphysics: Morrison and WSM5
June 1998 Morrison Goddard RRTM LW KF CU YSU PBL Noah LSM WSM5

15 Polar WRF and Polar MM5 January 1998 Polar WRF Polar MM5 Goddard
RRTM LW Morrison MP KF CU YSU PBL Noah LSM Polar MM5

16 Polar WRF and Polar MM5 January 1998 Polar WRF Polar MM5 Goddard
RRTM LW Morrison MP KF CU YSU PBL Noah LSM Polar MM5

17 Polar WRF and Polar MM5 June 1998 Polar WRF Polar MM5 Goddard RRTM LW
Morrison MP KF CU YSU PBL Noah LSM Polar MM5

18 Polar WRF and Polar MM5 June 1998 Polar WRF Polar MM5 Goddard RRTM LW
Morrison MP KF CU YSU PBL Noah LSM Polar MM5

19 Polar WRF and Polar MM5 June 1998 Polar WRF Polar MM5 Goddard RRTM LW
Morrison MP KF CU YSU PBL Noah LSM Polar MM5

20 Conclusions: Polar WRF Development
Some WRF physics options are clearly inappropriate for polar applications Dudhia SW: large negative bias in SWD Thermal diffusion soil model: large warm bias There appear to be issues with other physics options, which need more analysis Grell-Devenyi cumulus: excessive cloud cover MYJ PBL: wintertime cold bias Polar WRF has better skill than PMM5 for Jan Polar WRF has similar skill as PMM5 for June Processes in Polar WRF appear more realistic than in Polar MM5

21 Meetings, Presentations, and Publications
Conferences DOE CCPP Science Team Meeting (Sept 07) Poster overview of RACM project SEARCH for DAMOCLES (Oct 07) Atmospheric Modeling in an Arctic System Model Polar Optimized WRF Little Alaska Weather Symposium (May 08) Development and evaluation of Polar WRF Publications Bromwich, D.H., K.M. Hines, and L.-S. Bai, 2008: Development and testing of Polar WRF. Part II. The Arctic Ocean, submitted to J. Geophys. Res.

22

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