Modeling the ENSO impact of orbitally induced mean state climate changes
The sensitivity of the El Niño–Southern Oscillation (ENSO) phenomenon to changes in the tropical Pacific mean climate is investigated with a coupled atmosphere-ocean-sea ice general circulation model (AOGCM), the Kiel Climate Model (KCM). Different mean climate states are generated by changing the o...
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ftoceanrep:oai:oceanrep.geomar.de:14408 2023-05-15T18:18:39+02:00 Modeling the ENSO impact of orbitally induced mean state climate changes Salau, Opeyemi Schneider, Birgit Park, Wonsun Khon, Vyacheslav Latif, Mojib 2012 text https://oceanrep.geomar.de/id/eprint/14408/ https://oceanrep.geomar.de/id/eprint/14408/1/2011JC007742.pdf https://doi.org/10.1029/2011JC007742 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/14408/1/2011JC007742.pdf Salau, O., Schneider, B., Park, W. , Khon, V. and Latif, M. (2012) Modeling the ENSO impact of orbitally induced mean state climate changes. Open Access Journal of Geophysical Research: Oceans, 117 (C5). DOI 10.1029/2011JC007742 <https://doi.org/10.1029/2011JC007742>. doi:10.1029/2011JC007742 info:eu-repo/semantics/openAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1029/2011JC007742 2023-04-07T15:04:07Z The sensitivity of the El Niño–Southern Oscillation (ENSO) phenomenon to changes in the tropical Pacific mean climate is investigated with a coupled atmosphere-ocean-sea ice general circulation model (AOGCM), the Kiel Climate Model (KCM). Different mean climate states are generated by changing the orbital forcing that causes a redistribution of solar energy, which was a major driver of both the Holocene and the Eemian climates. We find that the ENSO amplitude is positively correlated with both the Equatorial Pacific sea surface temperature (SST) and the equatorial zonal SST contrast. The latter is controlled by the upwelling-induced damping of the SST changes in the Eastern Equatorial Pacific (EEP), and by the vertical ocean dynamical heating and zonal heat transport convergence in the Western Equatorial Pacific. The ENSO amplitude also correlates positively with the seasonal SST amplitude in the EEP and negatively with the strength of the easterly Trades over the Equatorial Pacific. However, the ENSO period is rather stable and stays within 3–4 years. Enhanced ENSO amplitude is simulated during the late-Holocene, in agreement with paleoproxy records. The tight positive correlation (r = 0.89) between the ENSO strength and the Western Pacific Warm Pool (WPWP) SST suggests that the latter may provide an indirect measure of the ENSO amplitude from proxy data that cannot explicitly resolve interannual variability. Key Points: - ENSO amplitude enhances as mean SST & west-east SST gradient rise in tropical Pacific - The broad range frequency peaks at periods of 3-4 years over Holocene and Eemian - The Pacific's warm pool SST is a suitable indicator to monitor ENSO variability Article in Journal/Newspaper Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Journal of Geophysical Research: Oceans 117 C5 n/a n/a |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The sensitivity of the El Niño–Southern Oscillation (ENSO) phenomenon to changes in the tropical Pacific mean climate is investigated with a coupled atmosphere-ocean-sea ice general circulation model (AOGCM), the Kiel Climate Model (KCM). Different mean climate states are generated by changing the orbital forcing that causes a redistribution of solar energy, which was a major driver of both the Holocene and the Eemian climates. We find that the ENSO amplitude is positively correlated with both the Equatorial Pacific sea surface temperature (SST) and the equatorial zonal SST contrast. The latter is controlled by the upwelling-induced damping of the SST changes in the Eastern Equatorial Pacific (EEP), and by the vertical ocean dynamical heating and zonal heat transport convergence in the Western Equatorial Pacific. The ENSO amplitude also correlates positively with the seasonal SST amplitude in the EEP and negatively with the strength of the easterly Trades over the Equatorial Pacific. However, the ENSO period is rather stable and stays within 3–4 years. Enhanced ENSO amplitude is simulated during the late-Holocene, in agreement with paleoproxy records. The tight positive correlation (r = 0.89) between the ENSO strength and the Western Pacific Warm Pool (WPWP) SST suggests that the latter may provide an indirect measure of the ENSO amplitude from proxy data that cannot explicitly resolve interannual variability. Key Points: - ENSO amplitude enhances as mean SST & west-east SST gradient rise in tropical Pacific - The broad range frequency peaks at periods of 3-4 years over Holocene and Eemian - The Pacific's warm pool SST is a suitable indicator to monitor ENSO variability |
format |
Article in Journal/Newspaper |
author |
Salau, Opeyemi Schneider, Birgit Park, Wonsun Khon, Vyacheslav Latif, Mojib |
spellingShingle |
Salau, Opeyemi Schneider, Birgit Park, Wonsun Khon, Vyacheslav Latif, Mojib Modeling the ENSO impact of orbitally induced mean state climate changes |
author_facet |
Salau, Opeyemi Schneider, Birgit Park, Wonsun Khon, Vyacheslav Latif, Mojib |
author_sort |
Salau, Opeyemi |
title |
Modeling the ENSO impact of orbitally induced mean state climate changes |
title_short |
Modeling the ENSO impact of orbitally induced mean state climate changes |
title_full |
Modeling the ENSO impact of orbitally induced mean state climate changes |
title_fullStr |
Modeling the ENSO impact of orbitally induced mean state climate changes |
title_full_unstemmed |
Modeling the ENSO impact of orbitally induced mean state climate changes |
title_sort |
modeling the enso impact of orbitally induced mean state climate changes |
publisher |
AGU (American Geophysical Union) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/14408/ https://oceanrep.geomar.de/id/eprint/14408/1/2011JC007742.pdf https://doi.org/10.1029/2011JC007742 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/14408/1/2011JC007742.pdf Salau, O., Schneider, B., Park, W. , Khon, V. and Latif, M. (2012) Modeling the ENSO impact of orbitally induced mean state climate changes. Open Access Journal of Geophysical Research: Oceans, 117 (C5). DOI 10.1029/2011JC007742 <https://doi.org/10.1029/2011JC007742>. doi:10.1029/2011JC007742 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2011JC007742 |
container_title |
Journal of Geophysical Research: Oceans |
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117 |
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C5 |
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1766195305804464128 |