Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Niño

Yang Wang; Jinnian Chen; Hongna Wang

doi:10.1007/s00343-013-2294-9

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Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Niño

Updated：2023-05-16

- Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Niño
- Journal of Oceanology and Limnology Vol. 31, Issue 5, Pages: 1137-1152(2013)
- Affiliations：
  
  1. Institute of Oceanology Chinese Academy of Sciences
  2. Key Laboratory of Ocean Circulation and Waves Chinese Academy of Sciences
  3. University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-013-2294-9
  CLC：
- Online First：07 September 2013，
  
  Published：2013
- Accepted：
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Wang, Y., Chen, J. & Wang, H. Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Niño., Chin. J. Ocean. Limnol. 31, 1137–1152 (2013). https://doi.org/10.1007/s00343-013-2294-9
DOI：

Wang, Y., Chen, J. & Wang, H. Distribution of the tropical Pacific surface zonal wind anomaly and its relation with two types of El Niño., Chin. J. Ocean. Limnol. 31, 1137–1152 (2013). https://doi.org/10.1007/s00343-013-2294-9 DOI：

摘要

Abstract

El Niño events with an eastern Pacific pattern (EP) and central Pacific pattern (CP) were first separated using rotated empirical orthogonal functions (REOF). Lead/lag regression and rotated singular value decomposition (RSVD) analyses were then carried out to study the relation between the surface zonal wind (SZW) anomalies and sea surface temperature (SST) anomalies in the tropical Pacific. A possible physical process for the CP El Niño was proposed. For the EP El Niño

strong westerly anomalies that spread eastward continuously produce an anomalous ocean zonal convergence zone (ZCZ) centered on about 165°W. This SZW anomaly pattern favors poleward and eastward Sverdrup transport at the equator. For the CP El Niño

westerly anomalies and the ZCZ are mainly confined to the western Pacific

and easterly anomalies blow in the eastern Pacific. This SZW anomaly pattern restrains poleward and eastward Sverdrup transport at the equator; however

there is an eastward Sverdrup transport at about 5°N

which favors the warming of the north-eastern tropical Pacific. It is found that the slowness of eastward propagation of subsurface warm water (partly from the downwelling caused by Ekman convergence and the ZCZ) is due to the slowdown of the undercurrent in the central basin

and vertical advection in the central Pacific may be important in the formation and disappearance of the CP El Niño.

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