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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

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.


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 capitalise on the global coverage offered by CEOP observations

RCA3 Rossby Centre (Sweden)

CLM GKSS Research Centre (Germany)

RSM Scripps Institution of Oceanography (USA)

RegCM3 Iowa State University (USA)

GEM-LAM RPN Environment Canada (Canada)

MRCC Ouranos-UQAM, Montréal (Canada)


Gem lam characteristics
GEM-LAM characteristics capitalise on the global coverage offered by CEOP observations

  • 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


Barrow, Alaska 71.3N 156.6E capitalise on the global coverage offered by CEOP observations


Simulations in capitalise on the global coverage offered by CEOP observations Arctic climates (Barrow, Alaska)


Barrow, Alaska: Radiation fluxes capitalise on the global coverage offered by CEOP observations

SW down

SW up

LW down

LW up







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





Simulations on temperature)non-native domain: Equatorial Island


Summary
Summary temperature)

  • 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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