Subthermocline anticyclonic gyre east of Mindanao and its relationship with the Mindanao Undercurrent

Lina Song; Yuanlong Li; Chuanyu Liu; Fan Wang

doi:10.1007/s00343-017-6111-8

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Subthermocline anticyclonic gyre east of Mindanao and its relationship with the Mindanao Undercurrent

Updated：2023-05-16

- Subthermocline anticyclonic gyre east of Mindanao and its relationship with the Mindanao Undercurrent
- Journal of Oceanology and Limnology Vol. 35, Issue 6, Pages: 1303-1318(2017)
- Affiliations：
  
  1. Key Laboratory of Ocean Circulation and Waves (KLOCAW) Institute of Oceanology Chinese Academy of Sciences
  2. University of Chinese Academy of Sciences
  3. Department of Atmospheric and Oceanic Sciences University of Colorado
  4. Function Laboratory for Ocean Dynamics and Climate Qingdao National Laboratory for Marine Science and Technology
- Author bio：
- Funds：
- DOI：10.1007/s00343-017-6111-8
  CLC：
- Online First：01 December 2016，
  
  Published：2017
- Accepted：
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Song, L., Li, Y., Liu, C. et al. Subthermocline anticyclonic gyre east of Mindanao and its relationship with the Mindanao Undercurrent., Chin. J. Ocean. Limnol. 35, 1303–1318 (2017). https://doi.org/10.1007/s00343-017-6111-8
DOI：

Song, L., Li, Y., Liu, C. et al. Subthermocline anticyclonic gyre east of Mindanao and its relationship with the Mindanao Undercurrent., Chin. J. Ocean. Limnol. 35, 1303–1318 (2017). https://doi.org/10.1007/s00343-017-6111-8 DOI：

摘要

Abstract

The quasi-permanent anticyclonic gyre (ACG) east of Mindanao is a dominant feature of the subthermocline circulation in the southern Philippine Sea

and it is believed closely associated with the continuous northward alongshore flow of the Mindanao Undercurrent (MUC). In this study

the structure and variability of this ACG were investigated using the 1950–2012 output of the Oceanic General Circulation Model for the Earth Simulator (OFES)

which can reproduce well the structure of the climatological intermediate-layer circulation and satellite-observed sea level variations in the southern Philippine Sea. Between 26.8–27.3 σ θ

the ACG covers a large area from the Mindanao coast to 131°E and from 3°N to 10°N. Its anticyclonic flow structure is unrelated to the surface Halmahera Eddy. The eddy-resolving simulation of the OFES revealed that the ACG consists of two components. The southern ACG (SACG) is centered at ∼6°N

while the northern ACG (NACG) is centered at ∼10°N. Seasonal and interannual variations of the ACG are linked to the variations of the northward MUC transport along the Mindanao coast

and the role of the SACG is more important than the NACG. Stronger (weaker) ACGs lead to greater (smaller) MUC transport. On the interannual timescale

the SACG shows a spectrum peak at 4–8 years

while the NACG has enhanced power within the 3–5-year band. A lead–lag correlation analysis indicates that interannual variations of the ACGs and the MUC transport are partly associated with the El Niño-Southern Oscillation. Possible causes for the ACG variability are discussed.

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references

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