BIASES IN NSIPP SIMULATIONS
• COMPARE AMIP AND COUPLED RUNS WITH SAME ATMOSPHERIC MODEL– CLIMATOLOGY– TROPICAL BIASES– INTERANNUAL VARIABILITY– SENSITIVITY
Credits: Sonya Miller, Phil Pegion, Augustin Vintzelios
MODELS
• NSIPP 1 AGCM (2 x 2.5 x 34L resolution)– RAS Convection (w/ autoconv. And reevap)– Louis turbulence– M-D Chou Radiation
• Poseidon OGCM (1/3 x 5/8 resolution)– Schopf’s quasi-isopycnal dynamics– Reduced gravity– Global (no Arctic or Med)
• Mosaic LSM• Direct coupling – no flux correction
SEASONAL ANOMALIES AT THE EQUATOR
2 DEG ATMO
1 DEG ATMOS
DIFFERENCE
CONTROL
CU FRIC
SUMMARY
• Model has many of the same biases as other coupled models.
• Clear indications of many of these are already apparent in AMIP mode.
• Though some like, the bias in the SPCZ (double ITCZ), are much worse in coupled mode.
• Upper air features (stationary waves, zonal mean biases) not very affected by coupling.
• Both AMIP and coupled models have reasonable stratus, but generic coupled problems in the East Equatorial Pacific still present