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ENSO Climate Variability in CCSM3: Comparison and Evaluation Study

Explore the ENSO behavior in the CCSM3 model by comparing different versions and analyzing SST and atmospheric teleconnections.

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ENSO Climate Variability in CCSM3: Comparison and Evaluation Study

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  1. ENSO in CCSM3 Clara Deser and Adam Phillips (with thanks to Bob Tomas and Mark Stevens) Climate Variability Working Group Meeting, CCSM Workshop, Santa Fe NM, July 9 2004

  2. ENSO in CCSM3 SST and Atmospheric Teleconnections • Compare T42 and T85 versions of CCSM3 (multi-century control integrations) • Compare CCSM3 with CCSM2 (T42 control integrations) • Compare CCSM3 T85 control with CAM3 T85 AMIP integration, 1950-2000

  3. SST: Mean and Variance CSM2 Nino3.4 CSM3 T42 CSM3 T85 OBS

  4. SST Nino3.4 Index: Observed vs. CCSM3 (T42) Observed Model

  5. Power Spectrum of SST Nino3.4 Index T42 CSM3 T42 CSM2 OBS T85 CSM3

  6. Observed Evolution of Composite ENSO Event

  7. Timing of ENSO Events Seasonal Cycle of ENSO Amplitude

  8. Warm – Cold ENSO CompositesDecember-FebruarySea Surface TemperaturePrecipitationSea Level Pressure

  9. SST Precipitation T42 similar 99% sig. Warm - Cold ENSO Composites (DJF)

  10. 1979-2000 Warm - Cold ENSO Composites (DJF) CAM3 forced with observed SST

  11. Warm - Cold ENSO Composite: SLP (DJF) 99% sig.

  12. Warm - Cold ENSO Composite: SLP (DJF)

  13. ENSO in CCSM3 Summary • Good timing, amplitude and spatial pattern of SST anomalies in CCSM3, but model ENSO events are too biennial compared to nature • Precipitation response is reasonable, although compensating anomalies are too confined meridionally (e.g., lack of a signal in the SPCZ, maritime continent and Indian Ocean regions) • SLP response over the North Pacific in boreal winter is excellent in T85 version, too weak in T42 version

  14. EXTRA SLIDES

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