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Extratropical atmosphere-ocean variability over the Northern Hemisphere of the Community Climate System Model version 3 (CCSM3) is examined and compared to observations. Results are presented for an extended control integration with horizontal resolution of T85 (1.4°) for the atmosphere and land and...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.421.9874 http://www.cesm.ucar.edu/publications/jclim04/Papers/CVWG2.pdf |
| Summary: | Extratropical atmosphere-ocean variability over the Northern Hemisphere of the Community Climate System Model version 3 (CCSM3) is examined and compared to observations. Results are presented for an extended control integration with horizontal resolution of T85 (1.4°) for the atmosphere and land and ~1 ° for the ocean and sea-ice. Several atmospheric phenomena are investigated including storms, clouds, and patterns of variability and their relationship to both tropical and extratropical SST anomalies. The mean storm track, the leading modes of storm track variability and the relationship of the latter to tropical and midlatitude sea surface temperature (SST) anomalies are fairly well simulated in CCSM3. The positive correlations between extratropical SST and lowcloud anomalies in summer are reproduced by the model, but there are clear biases in the relationship between clouds and the near surface meridional wind. The model accurately represents the circulation anomalies associated with the jet stream waveguide, the Pacific North American (PNA) pattern, and fluctuations associated with the Aleutian low, including how the latter two features are influenced by El Niño/Southern Oscillation (ENSO). |
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