Exploration of the causes and effects of some ccsm biases
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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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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


Ccsm sst y961 980 mean
CCSM SST (Y961-980 mean)

SWNET heat flux






Ccsm equatorial pacific sst annual mean and anomaly
CCSM Equatorial Pacific SST annual-mean and anomaly

R&S

CCSM (T42)

ocean only

CCSM T85

CAM only



Phase of the sst anomaly seasonal cycle
Phase of the SST anomaly seasonal cycle

INCORRECT

CORRECT

  • ocean only

  • CCSM (T42, T85)

  • CAM only

  • SWNET

  • LWDN


zonal wind stress

meridional wind stress

QSCAT

CCSM

QSCAT

CCSM


Phase of the sst anomaly seasonal cycle1
Phase of the SST anomaly seasonal cycle

INCORRECT

CORRECT

  • ocean only

  • CCSM (T42, T85)

  • CAM only

  • SWNET

  • LWDN

  • U wind only

  • V wind only


QSCAT winds (U and V)

CAM winds (U and V)


Phase of the sst anomaly seasonal cycle2
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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