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| Titel |
A Prototype Two-Decade Fully-Coupled Fine-Resolution CCSM Simulation |
| VerfasserIn |
Julie McClean, David Bader, Frank Bryan, Philip Jones, John Dennis, Arthur Mirin, Mathew Maltrud, Detelina Ivanova, Yoo Yin Kim, James Boyle |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036362
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| Zusammenfassung |
| A fully coupled global simulation using the Community Climate System Model (CCSM) was
configured using grid resolutions of 0.1- for the ocean and ice, and 0.25- for the atmospheric
and land components and was run for 20 years. The component models are the Los Alamos
Parallel Ocean Program 2.0 (POP2.0) and CICE4.0, and the Community Atmospheric Model
3.5 (CAM3.5) and the Community Land Model 3 (CLM3). As such, this coupled
simulation represents one of the first efforts to simulate the planetary system at such
high horizontal resolution, spontaneously generating much of the ocean mesoscale
variability and category 4 tropical cyclones in the atmosphere. The finite volume
dynamical core is used in CAM3.5. First we compare the climatology of the lower
circulation of the atmosphere and the upper ocean with data to identify biases. The sea
surface temperature (SST) in the North Atlantic is too cold; this basis is due to
excessively strong subpolar westerly winds that advect too much cold water into
the subtropical gyres via the eastern boundary currents. In the North Atlantic the
anomalously low SST leads to a dearth of hurricanes, while too high SSTs in the eastern
Pacific result in too many tropical systems forming in the North Pacific. The oceanic
response under the track of one tropical cyclone event will be discussed in detail.
Sea surface height (SSH) variability associated with Agulhas eddies indicates that
the bias seen in an equivalent forced stand-alone ocean simulation where eddies
follow the same too northwesterly path across the entire South Atlantic basin is
alleviated. Feature tracking of these eddies using SSH anomalies from altimetry and
CCSM indicate that the simulated eddy pathways in the coupled model are indeed
more realistic both in terms of their more westerly direction and their mid-basin
dissipation. |
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