The extratropical pacemaker effect on Pacific Walker circulation variability
The Pacific Walker circulation variability is associated with El Niño-Southern Oscillation and Interdecadal Pacific Oscillation and affects the global climate. The Walker circulation has strengthened since the comprehensive satellite observations began. This trend apparently contradicts with climate...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5018677 2023-07-02T03:33:46+02:00 The extratropical pacemaker effect on Pacific Walker circulation variability Kosaka, Y. Toda, M. Miyamoto, A. Watanabe, M. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018677 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-2149 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018677 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-2149 2023-06-11T23:39:57Z The Pacific Walker circulation variability is associated with El Niño-Southern Oscillation and Interdecadal Pacific Oscillation and affects the global climate. The Walker circulation has strengthened since the comprehensive satellite observations began. This trend apparently contradicts with climate model simulations driven by historical radiative forcing, which show its weakening. Regarding this model-observation inconsistency, recent studies argue the influence of biases in the South Pacific and Southern Ocean. In the present study, we examine the remote influence of extratropical SST variability on the Pacific Walker circulation by extratropical ocean pacemaker experiments with a climate model. Restoring SST variability toward observations poleward of 15º latitudes in the Pacific (with a linearly tapering buffer zone between 10º and 15º) greatly constrains the Walker circulation variability in the interannual to multidecadal time scales. This extratropical pacemaker effect remains, albeit weaker, if the restoring region is limited to poleward of 25º latitudes. These results suggest the importance of subtropical and midlatitude SST variability in attributing, predicting, and projecting the Walker circulation changes. Conference Object Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Southern Ocean Pacific |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The Pacific Walker circulation variability is associated with El Niño-Southern Oscillation and Interdecadal Pacific Oscillation and affects the global climate. The Walker circulation has strengthened since the comprehensive satellite observations began. This trend apparently contradicts with climate model simulations driven by historical radiative forcing, which show its weakening. Regarding this model-observation inconsistency, recent studies argue the influence of biases in the South Pacific and Southern Ocean. In the present study, we examine the remote influence of extratropical SST variability on the Pacific Walker circulation by extratropical ocean pacemaker experiments with a climate model. Restoring SST variability toward observations poleward of 15º latitudes in the Pacific (with a linearly tapering buffer zone between 10º and 15º) greatly constrains the Walker circulation variability in the interannual to multidecadal time scales. This extratropical pacemaker effect remains, albeit weaker, if the restoring region is limited to poleward of 25º latitudes. These results suggest the importance of subtropical and midlatitude SST variability in attributing, predicting, and projecting the Walker circulation changes. |
format |
Conference Object |
author |
Kosaka, Y. Toda, M. Miyamoto, A. Watanabe, M. |
spellingShingle |
Kosaka, Y. Toda, M. Miyamoto, A. Watanabe, M. The extratropical pacemaker effect on Pacific Walker circulation variability |
author_facet |
Kosaka, Y. Toda, M. Miyamoto, A. Watanabe, M. |
author_sort |
Kosaka, Y. |
title |
The extratropical pacemaker effect on Pacific Walker circulation variability |
title_short |
The extratropical pacemaker effect on Pacific Walker circulation variability |
title_full |
The extratropical pacemaker effect on Pacific Walker circulation variability |
title_fullStr |
The extratropical pacemaker effect on Pacific Walker circulation variability |
title_full_unstemmed |
The extratropical pacemaker effect on Pacific Walker circulation variability |
title_sort |
extratropical pacemaker effect on pacific walker circulation variability |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018677 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-2149 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018677 |
op_doi |
https://doi.org/10.57757/IUGG23-2149 |
_version_ |
1770273849073467392 |