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Exploration of the causes and effects of some CCSM biases

Exploration of the causes and effects of some CCSM biases. G. Danabasoglu and W. G. Large NCAR. PART I: warm SST biases off the western coasts of continents. better SSTs are important due to remote effects, particularly on tropical precipitation (ITCZ).

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Exploration of the causes and effects of some CCSM biases

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  1. Exploration of the causes and effects of some CCSM biases G. Danabasoglu and W. G. Large NCAR

  2. PART I: warm SST biases off the western coasts of continents • better SSTs are important due to remote effects, particularly on tropical precipitation (ITCZ) • improved SWNET and winds can reduce these SST biases significantly PART II: phase of the seasonal cycle of SST in the eastern Equatorial Pacific • properly phased winds produce the observed phase in SST MODEL SSTs OR CERTAIN FORCING FIELDS ARE MODIFIED IN SPECIFIED REGIONS LEVITUS SST, GISS (1984-2000) SWNET AND LWDN, QSCAT (2000-01) WINDS 10-YEAR COUPLED INTEGRATIONS WITH LEVITUS INITIAL CONDITIONS RESULTS SHOWN REPRESENT THE LAST 5-YEAR MEANS

  3. CCSM SST (Y961-980 mean) SWNET heat flux

  4. Specified SST off the west coast of S. America

  5. Specified SWNET and winds off the west coast of S. America

  6. Specified SST off the west coast of S. Africa

  7. Specified SWNET and winds off the west coast of S. Africa

  8. CCSM Equatorial Pacific SST annual-mean and anomaly R&S CCSM (T42) ocean only CCSM T85 CAM only

  9. CCSM SST (Y961-980 mean)

  10. Phase of the SST anomaly seasonal cycle INCORRECT CORRECT • ocean only • CCSM (T42, T85) • CAM only • SWNET • LWDN

  11. zonal wind stress meridional wind stress QSCAT CCSM QSCAT CCSM

  12. Phase of the SST anomaly seasonal cycle INCORRECT CORRECT • ocean only • CCSM (T42, T85) • CAM only • SWNET • LWDN • U wind only • V wind only

  13. QSCAT winds (U and V) CAM winds (U and V)

  14. Phase of the SST anomaly seasonal cycle INCORRECT CORRECT • ocean only • CCSM (T42, T85) • CAM only • SWNET • QSCAT winds (U and V) • LWDN • CAM winds (U and V) • U wind only • V wind only

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