GEM Climate Performance over Arctic

*** A Simulation on MARVIN ***

Minwei QIAN, Colin Jones, Katja Winger

Model Configuration

Resolution: 0.5 degreeGrid number: 182*154Simulation Period: 1983-2002

182

162

142

154 134 114

Average states

GEM ERA40 Diff

Winter

Summer

Sea Level Pressure

GEM ERA40 Diff

Winter

Summer

Geo. Potential Height (500mb)

GEM ERA40 Diff

Winter

Summer

Sensible Heat Fluxes (W/M2)

GEM ERA40 Diff

Winter

Summer

Latent Heat Fluxes (W/M2)

GEM ERA40 Diff

Winter

Summer

Solar Radiation downward (W/M2)

GEM ERA40 Diff

Winter

Summer

Cloud cover (%)

GEM ERA40 Diff

Winter

Summer

Longwave Radiation downward (W/M2)

GEM ERA40 Diff

Winter

Summer

T2M Temperature C

Variability

Standard deviation for T2M in JJA (interannual mean)

GEM ERA40

Standard deviation for T2M in DJF (interannual mean)

GEM ERA40

Standard deviation for SLP in JJA (interannual mean)

GEM ERA40

Standard deviation for SLP in DJF (interannual mean)

GEM ERA40

Standard deviation for Geo Potential in JJA (interannual mean)

GEM ERA40

Standard deviation for Geo Potential in DJF (interannual mean)

GEM ERA40

Summer Winter

SLP 2~8 mb 0~4 mb

Geo. Potential (500mb) 40~80 m 20~40 m

T2M -1 C 5~7 C

Sensible Heat 3~5 W/M2 10~20 W/M2

Latent Heat -5~-3 W/M2 (less ev) ~5 W/M2 (more ev)

Net Longwave -10~-5 W/M2 5~15 W/M2

Net Shortwave 10~15 W/M2 0 W/M2

Longwave downward ~ -10 W/M2 20~40 W/M2

Shortwave downward 10~40 W/M2 0 W/M2

Cloud cover -5 % 20%

Summary 1Over Arctic only

Summary 2. GEM captures interannual variability of climate.Interannual variability is larger in winter than in summer.

Geo. Potential Height (500mb) 1984-1992

GEM_LAM - ERA40 GEM_Global_Stretched - ERA40Summer

Winter

ERA40

GEM_LAM ERA40 GEM_Global_StretchedSummer

Winter

Standard deviation for Geo Potential 500 mb (interannual mean)

Merci!