Gem in the gewex transferability study
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GEM in the GEWEX Transferability Study. Zav Kothavala, Colin Jones, Katja Winger, Bernard Dugas & Ayrton Zadra. Introduction.

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GEM in the GEWEX Transferability Study

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Gem in the gewex transferability study

GEM in the GEWEX Transferability Study

Zav Kothavala, Colin Jones,

Katja Winger, Bernard Dugas & Ayrton Zadra


Introduction

Introduction

To determine that Regional Climate Models can realistically simulate the climate variability in all regions of the globe, we want to develop parameterizations that are evaluated against observations in all possible climates.

Regional atmospheric climate Models from different Continental Scale Experiments (CSE) were transferred from their “native domain” to other continents involved in the Inter-CSE Transferability Study (ICTS) - GEWEX project.


Gem in the gewex transferability study

The ICTS Regional Climate Modeling protocol aims to capitalise on the global coverage offered by CEOP observations

to assess and improve the global transferability of RCMs

Unmodified RCMs were run on a variety of domains around the globe


Participating rcms

Participating RCMs

RCA3Rossby Centre (Sweden)

CLMGKSS Research Centre (Germany)

RSMScripps Institution of Oceanography (USA)

RegCM3Iowa State University (USA)

GEM-LAMRPN Environment Canada (Canada)

MRCCOuranos-UQAM, Montréal (Canada)


Gem lam characteristics

GEM-LAM characteristics

  • Coté et al., MWR (1998); version 3.2.1

  • Hydrostatic primitive equations

  • Rotated grid on lat lon projection (0.5 degree horizontal resolution)

  • 53 hybrid vertical levels (top at ~10 hPa)

  • 30 minute timestep - period: 2000/01/01 – 2004/12/31

  • Solar constant 1367 kw/Wm2

  • Constant GHG concentrations

  • Deep convection (Kain-Fritsch) & shallow convection

  • Simple super-saturation based large-scale condensation

  • ISBA land-surface scheme

  • Boundary forcing every 6 hours with NCEP2 reanalyses


Gem in the gewex transferability study

Barrow, Alaska 71.3N 156.6E


Gem in the gewex transferability study

Simulations in Arctic climates (Barrow, Alaska)


Gem in the gewex transferability study

Barrow, Alaska: Radiation fluxes

SW down

SW up

LW down

LW up


Gem in the gewex transferability study

Barrow: Native domain freq. distribution (Surface temperature)


Gem in the gewex transferability study

Barrow: Native domain freq. distribution (Precipitation)


Gem in the gewex transferability study

Barrow: Native domain freq. distribution (wind speed)


Gem in the gewex transferability study

Barrow: Diurnal Cycle 2003-2004 (surface temperature)


Gem in the gewex transferability study

Manaus: Brazil - 2.61S 60.21W


Gem in the gewex transferability study

Non-native domain (Manaus: Brazil - 2.61S 60.21W)


Gem in the gewex transferability study

Manaus: frequency histograms (Surface temperature)


Gem in the gewex transferability study

Manaus: frequency histograms (Total daily precipitation)


Gem in the gewex transferability study

Manaus: Frequency distribution (wind speed)


Gem in the gewex transferability study

Simulations on non-native domain: Equatorial Island


Summary

Summary

  • Goal is to evaluate how RCMs simulate the diurnal cycle of temperature, precipitation and the heat fluxes in non-native domains

  • In general the temperature and radiation fields are closer to the observations in native domains compared to non-native domains. Precipitation and fluxes differ from the observed in native and non-native doimains.

  • Ongoing analyses in collaboration with individiual modelling groups to ascertain reasons for variations and possible fixes.


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