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Sensitivity of Modeled Dynamics to Atmosphere and Ocean Resolution in CESM Aurthors , NCAR CGD. Motivation. text. Experiment Descriptions. ENSO Variability. SST Climatology. Nino 3.4 Power Spectra. CESM using CAM5-SE coupled to POP2 at high (hr) and standard ( sr ) resolutions - PowerPoint PPT Presentation
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Sensitivity of Modeled Dynamics to Atmosphere and Ocean Resolution in CESM
Aurthors, NCAR CGD
CESM using CAM5-SE coupled to POP2 at high (hr) and standard (sr) resolutions• hr atmosphere, hr ocean: ne-120 (~0.25 deg), t-12 (~0.1deg)• hr atmosphere, sr ocean: ne-120 (~0.25 deg), gx1v6 (~1.0 deg)• sr atmosphere, sr ocean: ne-30 (~1.0 deg), gx1v6 (~1.0 deg)
Motivation
oSurface temperature reaches quasi-equillibrium in hr atm, hr ocn & sr atm, sr ocn; hr atm, sr ocn still warming
oTOM EF > 0 and trending down for all. End of run: hr atm, hr ocn (~0.3Wm-2) < sr atm, sr ocn (~0.5Wm-2) < hr atm, sr ocn (~0.6Wm-2)
text...
Experiment Descriptions
Summary and discussion
hr a
tm, h
r ocn
Surface Temperature
hr a
tm, s
r ocn
sr a
tm, s
r ocn
TOM Energy Flux Pot. Temp Anom from IC
Transient Behavior
SST (obs. HadISST 1999-2008)
hr a
tm, h
r ocn
hr a
tm, s
r ocn
sr a
tm, s
r ocn
Precip (obs. GPCP 1979-2009)
oC mm day-1
Annual Mean Bias
oC
Obs
erva
tions
Surface Stress (obs. ERS 1992-2000)
mm day-1 Nm-2
Nm-2
oGlobal mean and rms SST bias is...oPrecipitation biases...oWind stress...
ENSO Variability
still drifting at surface!
hr a
tm, h
r ocn
hr a
tm, s
r ocn
sr a
tm, s
r ocn
Nino 3.4 Power Spectra
Gray - HadISST
Ann SST EQ Pacific
Obs
erva
tions
oCSLP CI: 2hPa
SST Climatology
DJF Comp. SST, Tair, SLP
o hr atm, hr ocn has better depiction of SST compared to hr atm, sr ocn & sr atm, sr ocn o ...and better zonal SST gradient compared to sr atm, sr ocn
decr
ease
d oc
n re
s
decr
ease
d oc
n &
atm
os re
s
decr
ease
d at
mos
res
Red – Reynolds and Smith
o Shape and amplitude of Nino 3.4 power specra in hr atm, hr ocean resembles obs - hr atm, sr ocn & sr atm, sr ocn have too much variance and are too periodico SLP tele-connection amplitude is degraded compared to hr atm, sr ocn & sr atm, sr ocn however reasons are unclear
Winter Mean MLD Bias (obs. Reynolds and Smith)
m