Online bias estimation in SSH assimilation - NASA Global Modeling ...

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EnKF T+SSH, OBE

NSIPP CGCMv1 tier 1

False EN alert

missed EN

Niño-3.4 SST

missed EN

false LN alert false LN alert

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EnKF T+SSH, OBE NSIPP CGCMv1 tier 1 False EN alert missed EN missed EN Niño-3.4 SST missed EN false LN alert false LN alert

Conclusions • Online bias correction important when T data & SSH anomalies are assimilated. • 16+1 and 32+1 EnKF runs have comparable performance • EnKF-initialized hindcasts can miss or underestimate El Niño events but result in less false El Niño or La Niña alerts than production forecasts

Page 1 and 2: Temperature and Altimetry Assimilat
Page 3 and 4: GMAO CGCM coupled forecasting syste
Page 5 and 6: observable observable est. bias a)
Page 7 and 8: SSH OMF and OMA statistics Control
Page 9 and 10: Zonal sections EnKF 32 - 12/31/01 3
Page 11 and 12: Marginal T Kalman gain for a unit T
Page 13: Impact of assimilation on CGCM hind

Online bias estimation in SSH assimilation - NASA Global Modeling ...

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