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Evaluation of Cloud-Radiation Interaction in the Canadian GEM Model Using ARM Observations

Evaluation of Cloud-Radiation Interaction in the Canadian GEM Model Using ARM Observations. Danahé Paquin-Ricard 1 Colin Jones 1 , Paul Vaillancourt 2 1. CRCMD, UQAM 2. Environment Canada. Source: http://www.cs.pitt.edu/. Why the cloud-radiation interaction ?. Cloud-Radiation Interaction

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Evaluation of Cloud-Radiation Interaction in the Canadian GEM Model Using ARM Observations

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  1. Evaluation of Cloud-Radiation Interaction in the Canadian GEM Model Using ARM Observations Danahé Paquin-Ricard1 Colin Jones1, Paul Vaillancourt2 1. CRCMD, UQAM 2. Environment Canada Source:http://www.cs.pitt.edu/

  2. Why the cloud-radiation interaction ? Cloud-Radiation Interaction Microphysics Macrophysics Environment Precipitation Surface Radiation Budget • Diurnal cycle of SWD & LWD, for summer & winter (SGP) • LWP, winter (SGP) • LWP at SGP vs. NSA

  3. Model & Observations • GEM: • Prognostic total cloud water • Lateral boundary conditions: ERA40 • Prescribed SSTs and ice fraction • Horizontal resolution ≈ 42km • time step 30 min • Observations: • ARM-SGP site: 37°N, 97°W, 318 m • ARM-NSA site: 71°N, 157°W • Microwave radiometer, tipping bucket, radiometers … • Average over 3h period for all variables (except precipitation: 3h accumulation) over 7 years (1998-2004) • LWP & IWV: removed when precipitation ≥ 0,25mm/3h NSA SGP

  4. SZA≤30° 30°<SZA≤60° Shortwave Down, Summer (SGP)

  5. Longwave Down, Summer (SGP) Source: Bernard Dugas

  6. Shortwave Down, Winter (SGP)

  7. Longwave Down, Winter (SGP)

  8. *10 *10 *10 *10 *10 LWP (without precip.), Winter (SGP) • Overestimate of clear-sky occurrences • Precipitation too frequently triggered at too low LWP • Incorrect separation of cloud water between liquid & ice

  9. LWP (without precip.), SGP

  10. LWP (without precip.), NSA

  11. SGP NSA Underestimate of LWP  LWD & SWD SGP NSA JJA SON DJF MAM

  12. Summary for SGP Overestimate of light precipitation Underestimate of LWP, IWV & cloud fraction Underestimate of Overestimate of LWD SWD Warm & dry bias Overestimate of Underestimate of LWD for JJA convection Possible corrections to the microphysics scheme (autocon-version) to reduce light precipitation…

  13. Thank you! Source:http://www.cs.pitt.edu/

  14. More SGP LWD

  15. More SGP SWD

  16. More NSA LWD

  17. More NSA SWD

  18. Cloud Fraction & Integrated Water Vapor

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