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High-resolution RCM simulation of Kansas convective storms: Preliminary results William J. Gutowski, Jr., & David Flory Dept. Geol. & Atmospheric Sciences.

Published byGeoffrey Hutchinson Modified over 9 years ago

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Presentation on theme: "High-resolution RCM simulation of Kansas convective storms: Preliminary results William J. Gutowski, Jr., & David Flory Dept. Geol. & Atmospheric Sciences."— Presentation transcript:

1 High-resolution RCM simulation of Kansas convective storms: Preliminary results William J. Gutowski, Jr., & David Flory Dept. Geol. & Atmospheric Sciences Dept. of Agronomy Iowa State University

2 Motivation  Study Basin-Scale Land-Atmosphere Water Cycle  Focus: Walnut River Basin (Kansas, USA) GCIP Large-Scale Area - Southwest Observations:CASESABLEARM

3 Motivation Flat Terrain Convective Systems  Study Basin-Scale Land-Atmosphere Water Cycle  Focus: Walnut River Basin (Kansas, USA)

4 Motivation

5 Motivation

6 Model & Simulation NCAR/Penn State Non-hydrostatic MM5 (V3.3) l Modified Grell cumulus convection l Mixed-phase microphysics l RRTM & Dudhia radiation l Burk-Thompson PBL l Smirnova et al. land surface model Parallel Code  Cluster computation

7 20-km grid (120 x 150) Grell & Pagowski 1999 1994 - 1999 Model & Simulation

8 5-km grid (121 x 165) May - August 1997 (after spin-up) 20-km grid (120 x 150) Grell & Pagowski 1994 - 1999

9 Results - Precipitation

10

11 Precipitation & Vertical Wind 20 LST - 20 June Contours Precip: last hour 5 mm/d (filled) Vert. Motion: 300 hPa instantaneous 2 m/s (lines)

12 Precipitation & Vertical Wind 16 LST - 20 June

13 Precipitation & Vertical Wind 17 LST - 20 June

14 Precipitation & Vertical Wind 18 LST - 20 June

15 Precipitation & Vertical Wind 19 LST - 20 June

16 Precipitation & Vertical Wind 20 LST - 20 June

17 Precipitation & Vertical Wind 21 LST - 20 June

18 Precipitation & Vertical Wind 22 LST - 20 June

19 Precipitation & Vertical Wind 23 LST - 20 June

20 Precipitation & Vertical Wind 00 LST - 21 June

21 Precipitation & Vertical Wind 01 LST - 21 June

22 Precipitation & Vertical Wind

23 Results - Precipitation

24

25

26

27 Results - Vertical Motion

28

29 Need More From Convection Parameterization? Convection Parameterization? Grid % Convective Param Precipitation 5 km29% 20 km30%

30 Conclusion 1.Credible simulation of precipitation uCumulative amount uDiurnal cycle uSomewhat organized evolution 2.But … excessive single-grid vertical motion? vStrong motion, generally at single points  Excessive high-intensity precip. on 20-om grid?

31 Conclusion Thanks to: Georg Grell & Mariusz Pagowski (FSL) John Taylor (Argonne NL) Martyn Clark (CIRES) Acknowledgement: U.S. NOAA GAPP Program http://www.ogp.noaa.gov/mpe/gapp/gapp/abstracts/clark.htm

32 Precipitation & Vertical Wind

33 Results - Precipitation

34 Station Distribution - CDC Analysis

35 Precip. Diurnal Cycle Upper Ms. River

36 Results - Precipitation

37 Results

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