 |
| Titel |
The role of atmosphere and ocean physical processes in ENSO in a perturbed physics coupled climate model |
| VerfasserIn |
S. Y. Philip, M. Collins, G. J. Oldenborgh, B. J. J. M. Hurk |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1812-0784
|
| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 6, no. 2 ; Nr. 6, no. 2 (2010-04-20), S.441-459 |
| Datensatznummer |
250003462
|
| Publikation (Nr.) |
 copernicus.org/os-6-441-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| We examine the behaviour of the El Niño – Southern Oscillation (ENSO) in
an ensemble of global climate model simulations with perturbations to
parameters in the atmosphere and ocean components respectively. The influence
of the uncertainty in these parametrisations on ENSO are investigated
systematically. The ensemble exhibits a range of different ENSO behaviour in
terms of the amplitude and spatial structure of the sea surface temperature
(SST) variability. The nature of the individual feedbacks that operate within
the ENSO system are diagnosed using an Intermediate Complexity Model (ICM),
which has been used previously to examine the diverse ENSO behaviour of the
CMIP3 multi-model ensemble. Unlike in that case, the ENSO in these perturbed
physics experiments is not principally controlled by variations in the mean
climate state. Rather the parameter perturbations influence the ENSO
characteristics by modifying the coupling feedbacks within the cycle. The
associated feedbacks that contribute most to the ensemble variations are the
response of SST to local wind variability and damping, followed by the
response of SST to thermocline anomalies and the response of the zonal wind
stress to those SST anomalies. Atmospheric noise amplitudes and oceanic
processes play a relatively minor role. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|