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Special Session 5: Ocean-atmosphere interaction, multi-scale climate variability and their implication for biogeochemical processes |
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North Pacific gyre oscillation and the decadal variability of the Kuroshio extension
SS5-11-S
Wenyuan Li* , State Key Laboratory of Marine Environment Science,College of Ocean and Earth Sciences, Xiamen University
Xiaoyi Yang, State Key Laboratory of Marine Environment Science,College of Ocean and Earth Sciences, Xiamen University
Presenter Email: 814396710@qq.com
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| This study examines variability of North Pacific Gyre Oscillation (NPGO) and its relationship with the decadal variability of the Kuroshio Extension (KE). It is found that NPGO, defined as the second primary mode of sea surface height anomalies (SSHa) in the Northeast Pacific, has been significantly enhanced since the late 1980s. The SSHa signals associated with the NPGO mode propagate westward in the form of baroclinic Rossby wave from the central North Pacific into the KE region, where strong ocean–atmosphere interaction takes place. The decadal variability of SSHa in the KE region is more obvious after the late 1980s. Further analysis revealed that upstream KE jet strengthens (weakens) and narrows (broadens) when the SSHa corresponding to the positive (negative) phase of NPGO reach the east coast of Japan and then a quadrupole mode of sea level pressure anomalies in the North Pacific will be excited. The relationship between this SLP quadrupole mode and the atmospheric North Pacific Oscillation (NPO) mode as well as their roles in the NPGO cycling deserve further investigation. |
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