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 ? GEM Model Using ARM Observations

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 Model Using ARM 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


Shortwave down summer sgp

SZA≤30° GEM Model Using ARM Observations

30°<SZA≤60°

Shortwave Down, Summer (SGP)


Longwave down summer sgp
Longwave Down, Summer (SGP) GEM Model Using ARM Observations

Source: Bernard Dugas


Shortwave down winter sgp
Shortwave Down, Winter (SGP) GEM Model Using ARM Observations


Longwave down winter sgp
Longwave Down, Winter (SGP) GEM Model Using ARM Observations


Lwp without precip winter sgp

*10 GEM Model Using ARM Observations

*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


Lwp without precip sgp
LWP (without precip.), SGP GEM Model Using ARM Observations


Lwp without precip nsa
LWP (without precip.), GEM Model Using ARM Observations NSA


Underestimate of lwp lwd swd

SGP NSA GEM Model Using ARM Observations

Underestimate of LWP  LWD & SWD

SGP NSA

JJA SON DJF MAM


Summary for sgp
Summary for SGP GEM Model Using ARM Observations

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! GEM Model Using ARM Observations

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


More sgp lwd
More SGP LWD GEM Model Using ARM Observations


More sgp swd
More SGP SWD GEM Model Using ARM Observations


More nsa lwd
More NSA LWD GEM Model Using ARM Observations


More nsa swd
More NSA SWD GEM Model Using ARM Observations


Cloud fraction integrated water vapor
Cloud Fraction & Integrated Water Vapor GEM Model Using ARM Observations


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