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Analyzing Tropical Biases in NSIPP Simulations: Comparing AMIP and Coupled Models

This study examines biases in the NSIPP simulations by comparing Atmospheric Model Intercomparison Project (AMIP) runs with coupled model runs using the same atmospheric model. The focus is on climatological aspects and interannual variability, particularly in tropical regions. Notable findings include common biases observed in both AMIP and coupled runs, such as a significant double Intertropical Convergence Zone (ITCZ) issue. While upper-air features remain largely unaffected by coupling, some generic problems are notable in the East Equatorial Pacific.

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Analyzing Tropical Biases in NSIPP Simulations: Comparing AMIP and Coupled Models

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  1. 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

  2. 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

  3. SEASONAL ANOMALIES AT THE EQUATOR

  4. DIFFERENCE 1 DEG ATMOS 2 DEG ATMO

  5. CONTROL CU FRIC

  6. 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

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