The North Equatorial Current/Undercurrent volume transport and its 40‐day variability from a mooring array along 130°E

Xin YUAN; Qingye WANG; Junqiao FENG; Dunxin HU

doi:10.1007/s00343-020-0289-x

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The North Equatorial Current/Undercurrent volume transport and its 40‐day variability from a mooring array along 130°E

Physics | Updated：2023-05-20

- The North Equatorial Current/Undercurrent volume transport and its 40‐day variability from a mooring array along 130°E
- Journal of Oceanology and Limnology Vol. 39, Issue 6, Pages: 2127-2143(2021)
- Affiliations：
  
  1.Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.University of Chinese Academy of Sciences, Beijing 100049, China
  3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  4.Laboratory for Ocean and Climate Dynamics, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
- Author bio：
  
  Qingye WANG, wangqy@qdio.ac.cn
  Dunxin HU, dxhu@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-020-0289-x
  CLC：
- Received：27 July 2020，
  
  Accepted：18 September 2020，
  
  Online First：20 November 2020，
  
  Published：2021-11
- Accepted：
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Xin YUAN, Qingye WANG, Junqiao FENG, et al. The North Equatorial Current/Undercurrent volume transport and its 40‐day variability from a mooring array along 130°E[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2127-2143.
DOI：

Xin YUAN, Qingye WANG, Junqiao FENG, et al. The North Equatorial Current/Undercurrent volume transport and its 40‐day variability from a mooring array along 130°E[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2127-2143. DOI： 10.1007/s00343-020-0289-x.

摘要

Abstract

Traditionally

the estimated volume transport of the North Equatorial Current/Undercurrent (NEC/NEUC) is based on geostrophic equations and/or model results; however

direct observational evidence has not been acquired. We focused on one-year mooring observation data collected along 130°E and calculated the NEC/NEUC volume transport and explore its variability. Results show that the mean NEC and NEUC volume transports calculated from the mean velocity structures in the upper 950 m are 39 Sv and 6 Sv

respectively. Analysis of daily mooring data indicated that the volume transport of the NEC is approximately 52 (±14) Sv and the volume transport of the NEUC is approximately 18 (±13) Sv. A significant 40-day variation existed for the volume transport of both the NEC and NEUC. Overall

the intraseasonal variability of the NEC is vertically coherent with that of the NEUC. Observations indicated that the NEUC has three cores centered at approximately 8.5°N (~500 m)

12.5°N (~700 m)

and 17.5°N (~900 m)

of which the middle core (12.5°N) is the strongest. The 40-day variability of the NEC and NEUC is related to the variability of local wind stress curl anomalies among various Madden‐Julian Oscillation phases. When local wind field generates a negative (positive) wind stress curl anomaly

a weaker NEC (NEUC) and stronger NEUC (NEC) would occur.

关键词

Keywords

references

Chen Z H, Wu L X, Qiu B, Li L, Hu D X, Liu C Y, Jia F, Liang X. 2015. Strengthening Kuroshio observed at its origin during November 2010 to October 2012. Journal of Geophysical Research : Oceans , 120 (4): 2460-2470, https://doi.org/10.1002/2014JC010590..

Chern C S, Wang J. 2005. Interactions of mesoscale eddy and western boundary current: a reduced-gravity numerical model study. Journal of Oceanography , 61 (2): 271-282, https://doi.org/10.1007/s10872-005-0037-z..

Chiang T L, Wu C R, Qu T D, Hsin Y C. 2015. Activities of 50-80 day subthermocline eddies near the Philippine coast. Journal of Geophysical Research : Oceans , 120 (5): 3606-3623, https://doi.org/10.1002/2013JC009626..

Gao S, Qu T D, Hu D X. 2012. Origin and pathway of the Luzon Undercurrent identified by a simulated adjoint tracer. Journal of Geophysical Research : Oceans , 117 (C5): C05011, https://doi.org/10.1029/2011JC007748..

Hu D X, Cui M C. 1991. The western boundary current of the Pacific and its role in the climate. Chinese Journal of Oceanology and Limnology , 9 (1): 1-14, https://doi.org/10.1007/BF02849784..

Hu D X, Hu S J, Wu L X, Li L, Zhang L L, Diao X Y, Chen Z H, Li Y L, Wang F, Yuan D L. 2013. Direct measurements of the Luzon Undercurrent. Journal of Physical Oceanography , 43 (7): 1417-1425, https://doi.org/10.1175/JPO-D-12-0165.1..

Hu S J, Sprintall J, Guan C, Sun B W, Wang F, Yang G, Jia F, Wang J N, Hu D X, Chai F. 2018. Spatiotemporal features of intraseasonal oceanic variability in the Philippine Sea from mooring observations and numerical simulations. Journal of Geophysical Research : Oceans , 123 (7): 4874-4887, https://doi.org/10.1029/2017JC013653..

Kashino Y, España N, Syamsudin F, Richards K J, Jensen T, Dutrieux P, Ishida A. 2009. Observations of the North Equatorial Current, Mindanao Current, and Kuroshio current system during the 2006/07 El Niño and 2007/08 La Niña. Journal of Oceanography , 65 (3): 325-333, https://doi.org/10.1007/s10872-009-0030-z..

Kashino Y, Ishida A, Kuroda Y. 2005. Variability of the Mindanao current: mooring observation results. Geophysical Research Letters , 32 (18): L18611, https://doi.org/10.1029/2005GL023880..

Kashino Y, Ueki I, Sasaki H. 2015. Ocean variability East of Mindanao: mooring observations at 7°N, revisited. Journal of Geophysical Research : Oceans , 120 (4): 2540-2554, https://doi.org/10.1002/2015JC010703..

Kim Y Y, Qu T D, Jensen T, Miyama T, Mitsudera H, Kang H W, Ishida A. 2004. Seasonal and interannual variations of the North Equatorial Current bifurcation in a high-resolution OGCM. Journal of Geophysical Research : Oceans , 109 (C3): C03040, https://doi.org/10.1029/2003JC002013..

Madden R A, Julian P R. 1972. Description of global-scale circulation cells in the tropics with a 40-50 day period. Journal of the Atmospheric Sciences , 29 (6): 1109-1123, https://doi.org/10.1175/1520-0469(1972)029 < 1109:DOGSCC > 2.0.CO;2..

Nitani H. 1972. Beginning of the Kuroshio. In : Stommel H, Yashida K eds. Kuroshio: Its Physical Aspects. University of Washinton Press, Seattle. p. 129-163.

Qiu B, Chen S M, Rudnick D L, Kashino Y. 2015a. A new paradigm for the North Pacific subthermocline low-latitude western boundary current system. Journal of Physical Oceanography , 45 (9): 2407-2423, https://doi.org/10.1175/JPO-D-15-0035.1..

Qiu B, Chen S M, Sasaki H. 2013a. Generation of the North equatorial undercurrent jets by triad Baroclinic Rossby wave interactions. Journal of Physical Oceanography , 43 (12): 2682-2698, https://doi.org/10.1175/JPO-D-13-099.1..

Qiu B, Chen S M. 2010. Interannual-to-decadal variability in the bifurcation of the North equatorial current off the Philippines. Journal of Physical Oceanography , 40 (11): 2525-2538, https://doi.org/10.1175/2010JPO4462.1..

Qiu B, Joyce T M. 1992. Interannual variability in the mid- and low-latitude western North Pacific. Journal of Physical Oceanography , 22 (9): 1062-1079, https://doi.org/10.1175/1520-0485(1992)022 < 1062:IVITMA > 2.0.CO;2..

Qiu B, Lukas R. 1996. Seasonal and interannual variability of the North Equatorial Current, the Mindanao Current, and the Kuroshio along the Pacific western boundary. Journal of Geophysical Research : Oceans , 101 (C5): 12315-12330, https://doi.org/10.1029/95JC03204..

Qiu B, Rudnick D L, Cerovecki I, Cornuelle B D, Chen S M, Schönau M C, McClean J L, Gopalakrishnan G. 2015b. The Pacific North equatorial current: new insights from the origins of the Kuroshio and Mindanao Currents (OKMC) project. Oceanography , 28 (4): 24-33, https://doi.org/10.5670/oceanog.2015.78..

Qiu B, Rudnick D L, Chen S M, Kashino Y. 2013b. Quasi-stationary North Equatorial Undercurrent jets across the tropical North Pacific Ocean. Geophysical Research Letters , 40 (10): 2183-2187, https://doi.org/10.1002/grl.50394..

Qu T D, Kagimoto T, Yamagata T. 1997a. A subsurface countercurrent along the east coast of Luzon. Deep Sea Research Part I : Oceanographic Research Papers , 44 (3): 413-423, https://doi.org/10.1016/S0967-0637(96)00121-5..

Qu T D, Lukas R. 2003. The bifurcation of the North equatorial current in the Pacific. Journal of Physical Oceanography , 33 (1): 5-18, https://doi.org/10.1175/1520-0485(2003)033 < 0005:TBOTNE > 2.0.CO;2..

Qu T D, Meyers G, Godfrey J S, Hu D X. 1997b. Upper ocean dynamics and its role in maintaining the annual mean western Pacific warm pool in a global GCM. International Journal of Climatology , 17 (7): 711-724, https://doi.org/10.1002/(SICI)1097-0088(19970615)17:7 < 711::AID-JOC157 > 3.0.CO;2-T..

Qu T D, Mitsudera H, Yamagata T. 1998. On the western boundary currents in the Philippine Sea. Journal of Geophysical Research : Oceans , 103 (C4): 7537-7548, https://doi.org/10.1029/98JC00263..

Ren Q P, Li Y L, Wang F, Song L N, Liu C Y, Zhai F G. 2018. Seasonality of the Mindanao current/undercurrent system. Journal of Geophysical Research : Oceans , 123 (2): 1105-1122, https://doi.org/10.1002/2017JC013474..

Schönau M C, Rudnick D L. 2015. Glider observations of the North Equatorial current in the western tropical Pacific. Journal of Geophysical Research : Oceans , 120 (5): 3586-3605, https://doi.org/10.1002/2014JC010595..

Toole J M, Millard R C, Wang Z, Pu S. 1990. Observations of the Pacific North equatorial current bifurcation at the Philippine Coast. Journal of Physical Oceanography , 20 (2): 307-318, https://doi.org/10.1175/1520-0485(1990)020 < 0307:OOTPNE > 2.0.CO;2..

Toole J M, Zou Z, Millard R C. 1988. On the circulation of the upper waters in the western equatorial Pacific Ocean. Deep Sea Research Part A . Oceanographic Research Papers , 35 (9): 1451-1482, https://doi.org/10.1016/0198-0149(88)90097-0..

Wang F J, Wang Q Y, Hu D X, Zhai F G, Hu S J. 2016a. Seasonal variability of the Mindanao Current determined using mooring observations from 2010 to 2014. Journal of Oceanography , 72 (5): 787-799, https://doi.org/10.1007/s10872-016-0373-1..

Wang F J, Wang Q Y, Zhang L L, Hu D X, Hu S J, Feng J Q. 2019. Spatial distribution of the seasonal variability of the North Equatorial Current. Deep Sea Research Part I : Oceanographic Research Papers , 144 : 63-74, https://doi.org/10.1016/j.dsr.2019.01.001..

Wang F, Chang P, Hu D X, Seidel H. 2002. Circulation in the western tropical Pacific Ocean and its seasonal variation. Chinese Science Bulletin , 47 (7): 591-595, https://doi.org/10.1360/02tb9136..

Wang F, Hu D, Bai H. 1998. Western boundary undercurrents east of the Philippines. In : Proceedings of the 4 th Pacific Ocean Remote Sensing Conference. Qingdao, China. p. 551-556..

Wang F, Li Y L, Wang J N. 2016b. Intraseasonal variability of the surface zonal currents in the western tropical Pacific Ocean: characteristics and mechanisms. Journal of Physical Oceanography , 46 (12): 3639-3660, https://doi.org/10.1175/JPO-D-16-0033.1..

Wang F, Zang N, Li Y L, Hu D X. 2015. On the subsurface countercurrents in the Philippine Sea. Journal of Geophysical Research : Oceans , 120 (1): 131-144, https://doi.org/10.1002/2013JC009690..

Wang Q Y, Cao R X, Zhang S W, Hu D X. 2009. Bifurcation of Pacific North equatorial current at the surface. Science in China Series D : Earth Sciences , 52 (2): 227-231, https://doi.org/10.1007/s11430-009-0020-4..

Wang Q Y, Zhai F G, Hu D X. 2014a. Variations of Luzon Undercurrent from observations and numerical model simulations. Journal of Geophysical Research : Oceans , 119 (6): 3792-3805, https://doi.org/10.1002/2013JC009694..

Wang Q Y, Zhai F G, Wang F J, Hu D X. 2014b. Intraseasonal variability of the subthermocline current east of Mindanao. Journal of Geophysical Research : Oceans , 119 (12): 8552-8566, https://doi.org/10.1002/2014JC010343..

Wheeler M C, Hendon H H. 2004. An all-season real-time multivariate MJO index: development of an index for monitoring and prediction. Monthly Weather Review , 132 (8): 1917-1932, https://doi.org/10.1175/1520-0493(2004)132 < 1917:AARMMI > 2.0.CO;2..

Yan Q X, Hu D X, Zhai F G. 2014. Seasonal variability of the North Equatorial Current transport in the western Pacific Ocean. Chinese Journal of Oceanology and Limnology , 32 (1): 223-237, https://doi.org/10.1007/s00343-014-3052-3..

Yaremchuk M, Qu T D. 2004. Seasonal variability of the large-scale currents near the coast of the Philippines. Journal of Physical Oceanography , 34 (4): 844-855, https://doi.org/10.1175/1520-0485(2004)034 < 0844:SVOTLC > 2.0.CO;2..

Zhang L L, Hu D X, Hu S J, Wang F, Wang F J, Yuan D L. 2014. Mindanao Current/Undercurrent measured by a subsurface mooring. Journal of Geophysical Research : Oceans , 119 (6): 3617-3628, https://doi.org/10.1002/2013JC009693..

Zhang L L, Wang F J, Wang Q Y, Hu S J, Wang F, Hu D X. 2017. Structure and variability of the North equatorial current/undercurrent from mooring measurements at 130°E in the western Pacific. Scientific Reports , 7 : 46310, https://doi.org/10.1038/srep46310..

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