evaluation of cloud radiation interaction in the canadian gem model using arm observations
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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

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/

why the cloud radiation interaction
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
model observations
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

longwave down summer sgp
Longwave Down, Summer (SGP)

Source: Bernard Dugas

lwp without precip winter sgp

*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
summary for sgp
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…

thank you

Thank you!

Source:http://www.cs.pitt.edu/

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