Seasonal variation of the surface North Equatorial Countercurrent (NECC) in the western Pacific Ocean

Jun Zhao; Yuanlong Li; Fan Wang

doi:10.1007/s00343-016-5119-9

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Seasonal variation of the surface North Equatorial Countercurrent (NECC) in the western Pacific Ocean

Updated：2023-05-16

- Seasonal variation of the surface North Equatorial Countercurrent (NECC) in the western Pacific Ocean
- Journal of Oceanology and Limnology Vol. 34, Issue 6, Pages: 1332-1346(2016)
- Affiliations：
  
  1. Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences
  2. Department of Atmospheric and Oceanic Sciences University of Colorado
  3. Function Laboratory for Ocean Dynamics and Climate Qingdao National Laboratory for Marine Science and Technology
- Author bio：
- Funds：
- DOI：10.1007/s00343-016-5119-9
  CLC：
- Online First：17 March 2016，
  
  Published：2016
- Accepted：
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Zhao, J., Li, Y. & Wang, F. Seasonal variation of the surface North Equatorial Countercurrent (NECC) in the western Pacific Ocean., Chin. J. Ocean. Limnol. 34, 1332–1346 (2016). https://doi.org/10.1007/s00343-016-5119-9
DOI：

Zhao, J., Li, Y. & Wang, F. Seasonal variation of the surface North Equatorial Countercurrent (NECC) in the western Pacific Ocean., Chin. J. Ocean. Limnol. 34, 1332–1346 (2016). https://doi.org/10.1007/s00343-016-5119-9 DOI：

摘要

Abstract

The North Equatorial Countercurrent (NECC) is an important zonal flow in the upper circulation of the tropical Pacific Ocean

which plays a vital role in the heat budget of the western Pacific warm pool. Using satellite-derived data of ocean surface currents and sea surface heights (SSHs) from 1992 to 2011

the seasonal variation of the surface NECC in the western tropical Pacific Ocean was investigated. It was found that the intensity (INT) and axis position (Y CM ) of the surface NECC exhibit strikingly different seasonal fluctuations in the upstream (128°–136°E) and downstream (145°–160°E) regions. Of the two regions

the seasonal cycle of the upstream NECC shows the greater interannual variability. Its INT and YCM are greatly influenced by variations of the Mindanao Eddy

Mindanao Dome (MD)

and equatorial Rossby waves to its south. Both INT and Y CM also show semiannual signals induced by the combined effects of equatorial Rossby waves from the Central Pacific and local wind forcing in the western Pacific Ocean. In the downstream region

the variability of the NECC is affected by SSH anomalies in the MD and the central equatorial Pacific Ocean. Those in the MD region are especially important in modulating the YCM of the downstream NECC. In addition to the SSH-related geostrophic flow

zonal Ekman flow driven by meridional wind stress also plays a role

having considerable impact on INT variability of the surface NECC. The contrasting features of the variability of the NECC in the upstream and downstream regions reflect the high complexity of regional ocean dynamics.

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references

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