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MM5 - Iowa State

This document outlines the methodologies and setups for soil moisture initialization and reanalysis runs conducted at Iowa State using the MM5 model. Focusing on soil moisture during a neutral year, it discusses spin-up processes over three years, boundary condition relaxations, and parameterization strategies such as the Kain-Fritsch2 convective scheme and NOAH land scheme. It also addresses missing output variables and reanalyses key atmospheric variables such as precipitation and temperature. The research explores hydrological analyses and examines trends in wind speeds and precipitation over the past two decades.

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MM5 - Iowa State

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  1. MM5 - Iowa State • Soil initialization: - Reanalysis run: soil moisture at initial time - GCM runs: soil moisture in a “neutral” year of reanalysis run • Spin up: • 3 years • Interior nudging? No

  2. MM5 - Iowa State • Boundary conditions relaxation: - 15-point sponge zone - damping strengths decays exponentially toward interior • Time step: • 100 seconds • Missing output variables: • No

  3. MM5 - Iowa State • Parameterizations: • Non-hydrostatic, compressible dynamics • Kain-Fritsch2 mass flux convective scheme • Reisner mixed-phase mmicrophysics • NOAH land scheme • USGS 25 land/24 vegetation categories • thermal/water layers: 4 • Hong-Pan (MRF) counter-gradient, non-local K PBL

  4. NARCCAP Domains

  5. MM5 – Variables Submitted to Archive • Reanalysis run: pr, zg500, huss, tas, uas, vas, snd, ts, zmla • CCSM current: pr, zg500, huss, tas, uas vas, snd, ts, zmla, ps, psl, prc • CCSM scenario: pr, zg500, huss, tas, uas, vas, snd, ts, zmla, ps, psl, prc • Bottleneck? Script development

  6. Iowa State RESEARCH PLANS • ENSO cycle in NARCCAP domain • Extreme monthly (and more frequent?) precipitation • Surface and upper air winds

  7. Surface Wind Analysis (Pryor et al.) Average of annual mean wind speeds (1979-2000)

  8. Surface Wind Analysis (Pryor et al.) Synthesis of trends

  9. Surface Wind Analysis (Pryor et al.) Trends in annual mean wind speeds at 00 UTC

  10. Surface Wind Analysis (Pryor et al.) Trends in annual mean wind speeds at 12 UTC

  11. Hydrologic Analysis (Takle et al.) SWAT model domain Simulation period: last 2 decades of 20C

  12. Hydrologic Analysis (Takle et al.) Streamflow Interannual Variability

  13. Hydrologic Analysis (Takle et al.) Precipitation Annual Cycle

  14. Hydrologic Analysis (Takle et al.) Streamflow Annual Cycle

  15. MM5 - Iowa State Thank you

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