Drivers of the projected changes to the Pacific Ocean equatorial circulation
Identifieur interne : 000621 ( Istex/Checkpoint ); précédent : 000620; suivant : 000622Drivers of the projected changes to the Pacific Ocean equatorial circulation
Auteurs : A. Sen Gupta [Australie] ; A. Ganachaud [France] ; S. Mcgregor [Australie] ; J. N. Brown [Australie] ; L. Muir [États-Unis]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2012-05.
Descripteurs français
- Wicri :
English descriptors
- KwdEn :
- Anomaly, Anonymous reviewer, Boundary currents, Boundary flow, Central basin, Circulation changes, Clim, Climate change, Climate change research centre, Climate models, Cmip3, Cmip3 models, Convergence, Eastern basin, Enso, Enso index, Equatorial, Equatorial circulation, Equatorial easterlies, Equatorial trade winds, Equatorial trades, Equatorial undercurrent, Equatorial winds, Equatorward, Equatorward flow, Ganachaud, Geophys, Global warming, Gupta, High concentrations, Individual models, Indonesian throughflow, Interannual timescales, Interannual variability, Interior pycnocline convergence, Linear response, Meridional, Meridional velocity, Mindanao, Ngcu, Northern hemisphere, Observational estimates, Other hand, Pacific ocean, Pacific ocean circulation projections, Pycnocline, Robust, Shallow water model, Significant increase, Soden, Southern hemisphere, Surface temperature, Sverdrup transport, Trade winds, Tropical circulation, Undercurrent, Upper ocean response, Vecchi, Western basin, Western boundary, Western boundary currents, Western boundary flow, Wind changes, Wind stress, Zonal, Zonal velocity.
- Teeft :
- Anomaly, Anonymous reviewer, Boundary currents, Boundary flow, Central basin, Circulation changes, Clim, Climate change, Climate change research centre, Climate models, Cmip3, Cmip3 models, Convergence, Eastern basin, Enso, Enso index, Equatorial, Equatorial circulation, Equatorial easterlies, Equatorial trade winds, Equatorial trades, Equatorial undercurrent, Equatorial winds, Equatorward, Equatorward flow, Ganachaud, Geophys, Global warming, Gupta, High concentrations, Individual models, Indonesian throughflow, Interannual timescales, Interannual variability, Interior pycnocline convergence, Linear response, Meridional, Meridional velocity, Mindanao, Ngcu, Northern hemisphere, Observational estimates, Other hand, Pacific ocean, Pacific ocean circulation projections, Pycnocline, Robust, Shallow water model, Significant increase, Soden, Southern hemisphere, Surface temperature, Sverdrup transport, Trade winds, Tropical circulation, Undercurrent, Upper ocean response, Vecchi, Western basin, Western boundary, Western boundary currents, Western boundary flow, Wind changes, Wind stress, Zonal, Zonal velocity.
Abstract
Climate models participating in the third Coupled Model Inter Comparison Project (CMIP3) suggest a significant increase in the transport of the New Guinea Coastal Undercurrent (NGCU) and the Equatorial Undercurrent (EUC, in the central and western Pacific) and a decrease in the Mindanao current and the Indonesian Throughflow. Most models also project a reduction in the strength of the equatorial Trade winds. Typically, on ENSO time scales, a weakening of the equatorial easterlies would lead to a reduction in EUC strength in the central Pacific. The strengthening of the EUC projected for longer timescales, can be explained by a robust projected intensification of the south‐easterly trade winds and an associated off‐equatorial wind‐stress curl change in the Southern Hemisphere. This drives the intensification of the NGCU and greater water input to the EUC in the west. A 1½‐layer shallow water model, driven by projected wind stress trends from the CMIP3 models demonstrates that the projected circulation changes are consistent with a purely wind driven response. While the equatorial winds weaken for both El Niño events and in the projections, the ocean response and the mechanisms driving the projected wind changes are distinct from those operating on interannual timescales.
Url:
DOI: 10.1029/2012GL051447
Affiliations:
- Australie, France, États-Unis
- Connecticut, Midi-Pyrénées, Occitanie (région administrative)
- Toulouse
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velocity</term><term>Mindanao</term><term>Ngcu</term><term>Northern hemisphere</term><term>Observational estimates</term><term>Other hand</term><term>Pacific ocean</term><term>Pacific ocean circulation projections</term><term>Pycnocline</term><term>Robust</term><term>Shallow water model</term><term>Significant increase</term><term>Soden</term><term>Southern hemisphere</term><term>Surface temperature</term><term>Sverdrup transport</term><term>Trade winds</term><term>Tropical circulation</term><term>Undercurrent</term><term>Upper ocean response</term><term>Vecchi</term><term>Western basin</term><term>Western boundary</term><term>Western boundary currents</term><term>Western boundary flow</term><term>Wind changes</term><term>Wind stress</term><term>Zonal</term><term>Zonal velocity</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Anomaly</term><term>Anonymous reviewer</term><term>Boundary currents</term><term>Boundary flow</term><term>Central basin</term><term>Circulation 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Comparison Project (CMIP3) suggest a significant increase in the transport of the New Guinea Coastal Undercurrent (NGCU) and the Equatorial Undercurrent (EUC, in the central and western Pacific) and a decrease in the Mindanao current and the Indonesian Throughflow. Most models also project a reduction in the strength of the equatorial Trade winds. Typically, on ENSO time scales, a weakening of the equatorial easterlies would lead to a reduction in EUC strength in the central Pacific. The strengthening of the EUC projected for longer timescales, can be explained by a robust projected intensification of the south‐easterly trade winds and an associated off‐equatorial wind‐stress curl change in the Southern Hemisphere. This drives the intensification of the NGCU and greater water input to the EUC in the west. A 1½‐layer shallow water model, driven by projected wind stress trends from the CMIP3 models demonstrates that the projected circulation changes are consistent with a purely wind driven response. While the equatorial winds weaken for both El Niño events and in the projections, the ocean response and the mechanisms driving the projected wind changes are distinct from those operating on interannual timescales.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>États-Unis</li></country><region><li>Connecticut</li><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Toulouse</li></settlement></list><tree><country name="Australie"><noRegion><name sortKey="Sen Gupta, A" sort="Sen Gupta, A" uniqKey="Sen Gupta A" first="A." last="Sen Gupta">A. Sen Gupta</name></noRegion><name sortKey="Brown, J N" sort="Brown, J N" uniqKey="Brown J" first="J. N." last="Brown">J. N. Brown</name><name sortKey="Mcgregor, S" sort="Mcgregor, S" uniqKey="Mcgregor S" first="S." last="Mcgregor">S. Mcgregor</name><name sortKey="Sen Gupta, A" sort="Sen Gupta, A" uniqKey="Sen Gupta A" first="A." last="Sen Gupta">A. Sen Gupta</name><name sortKey="Sen Gupta, A" sort="Sen Gupta, A" uniqKey="Sen Gupta A" first="A." last="Sen Gupta">A. Sen Gupta</name></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Ganachaud, A" sort="Ganachaud, A" uniqKey="Ganachaud A" first="A." last="Ganachaud">A. Ganachaud</name></region></country><country name="États-Unis"><region name="Connecticut"><name sortKey="Muir, L" sort="Muir, L" uniqKey="Muir L" first="L." last="Muir">L. Muir</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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