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Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Niño Events.
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- Author(s): YILONG LYU1,2,3; YUANLONG LI1,2,3; JIANING WANG1,2,3; JING DUAN1,2,3; XIAOHUI TANG1,2,3; CHUANYU LIU1,2,3; LINLIN ZHANG1,2,3; QIANG MA1,2,3; FAN WANG1,2,3,4
- Source:
Journal of Physical Oceanography. Nov2020, Vol. 50 Issue 11, p3353-3373. 21p.- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: Mooring measurements at ;1408E in the western equatorial Pacific Ocean documented greatly intensified eastward subsurface currents, which largely represent the nascent Equatorial Undercurrent, to ~67 cm s-1 in boreal summer of 2016. The eastward currents occupied the entire upper 500m while the westward surface currents nearly disappeared. Historical in situ data observed similar variations after most El Niño events. Further analysis combining satellite and reanalysis data reveals that the eastward currents observed at ~1408E are a component of an anomalous counterclockwise circulation straddling the equator, with westward current anomalies retroflecting near the western boundary and feeding southeastward current anomalies along the New Guinea coast. A 1.5-layer reduced-gravity ocean model is able to crudely reproduce these variations, and a hierarchy of sensitivity experiments is performed to understand the underlying dynamics. The anomalous circulation is largely the delayed ocean response to equatorial wind anomalies over the centralto- eastern Pacific basin emerging in the mature stage of El Niño. Downwelling Rossby waves are generated by the reflection of equatorial Kelvin waves and easterly winds in the eastern Pacific. Upon reaching the western Pacific, the southern lobes of Rossby waves encounter the slanted New Guinea island and deflect to the equator, establishing a local sea surface height maximum and leading to the detour of westward currents flowing from the Pacific interior. Additional experiments with edited western boundary geometry confirm the importance of topography in regulating the structure of this cross-equatorial anomalous circulation. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Journal of Physical Oceanography is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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