Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow

Guijun LIU; Yu WANG

doi:10.1007/s00343-025-4352-5

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Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow

Physics | Updated：2026-05-07

- Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow
- Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow
- 海洋湖沼学报(英文) 2026年44卷第2期页码：560-569
- Affiliations：
  
  1.Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China
  2.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
  3.National Marine Environmental Monitoring Center, Dalian 116023, China
- Author bio：
  
  yuwang@nmemc.org.cn
- Funds：
  
  the Research of Key Support Measurement Technology System for Global Change and Air-Sea Interaction(GASI-02-ZL-02)
- DOI：10.1007/s00343-025-4352-5
  中图分类号：
- 收稿：2024-12-23，
  
  录用：2025-04-11，
  
  网络首发：2025-06-06，
  
  纸质出版：2026-03-01
- Accepted：
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Guijun LIU, Yu WANG. Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow[J]. 海洋湖沼学报(英文), 2026,44(2):560-569.

LIU Guijun,WANG Yu.Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow[J].Journal of Oceanology and Limnology,2026,44(02):560-569.
Guijun LIU, Yu WANG. Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow[J]. 海洋湖沼学报(英文), 2026,44(2):560-569. DOI： 10.1007/s00343-025-4352-5.

LIU Guijun,WANG Yu.Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow[J].Journal of Oceanology and Limnology,2026,44(02):560-569. DOI： 10.1007/s00343-025-4352-5.

摘要

Abstract

Driven by the persistent baroclinic pressure difference

the Luzon Strait deepwater overflow (LSDO) from the Pacific into the South China Sea (SCS) plays an influential role in the dynamical processes in the deep SCS. Based on the ocean bottom pressure (OBP) data

seasonal cycles of the OBP anomalies in the SCS and the LSDO are presented. On the seasonal scale

for shelf areas shallower than 200 m

the OBP anomalies are regulated by the wind stress curls: negative curls in winter lead to the Ekman convergences and the ensuing positive OBP anomalies and vice versa for positive curls in summer

while for the deep basin deeper than 2 000 m

the OBP anomalies show spatial consistency in sign: negative in winter and spring as well as positive in summer and autumn. The seasonal cycle of the LSDO is revealed and found to be mainly due to baroclinic processes east of the Luzon Strait. Along 21.25°N

significant seasonal signals extend downward and westward

reaching about 2 500-m depth at 124°E

and phase isolines are parallel to this extending. These facts suggest that the seasonal variability of the LSDO might originate from the upper ocean and meridional mode Rossby waves could be a possible dynamical mechanism.

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references

Barnett T P . 1983 . Interaction of the monsoon and Pacific Trade Wind system at interannual time scales part I: the equatorial zone . Monthly Weather Review , 111 ( 4 ): 756 - 773 , https://doi.org/10.1175/1520-0493(1983)111<0756:IOTMAP>2.0.CO;2. https://doi.org/10.1175/1520-0493(1983)111<0756:IOTMAP>2.0.CO;2.

Bingham R J , Hughes C W . 2008 . Determining North Atlantic meridional transport variability from pressure on the western boundary: a model investigation . Journal of Geophysical Research : Oceans , 113 ( C9 ): C 09008 , https://doi.org/10.1029/2007JC004679 https://doi.org/10.1029/2007JC004679 .

Bingham R J , Hughes C W . 2009 . Geostrophic dynamics of meridional transport variability in the subpolar North Atlantic . Journal of Geophysical Research : Oceans , 114 ( C12 ): C 12029 , https://doi.org/10.1029/2009JC005492 https://doi.org/10.1029/2009JC005492 .

Chen L , Yang J Y , Wu L X . 2023 . Topography effects on the seasonal variability of ocean bottom pressure in the North Pacific Ocean . Journal of Physical Oceanography , 53 ( 3 ): 929 - 941 , https://doi.org/10.1175/JPO-D-22-0140.1 https://doi.org/10.1175/JPO-D-22-0140.1 .

Chu P C , Edmons N L , Fan C W . 1999 . Dynamical mechanisms for the South China Sea seasonal circulation and thermohaline variabilities . Journal of Physical Oceanography , 29 ( 11 ): 2971 - 2989 , https://doi.org/10.1175/1520-0485(1999)029<2971:DMFTSC>2.0.CO;2. https://doi.org/10.1175/1520-0485(1999)029<2971:DMFTSC>2.0.CO;2.

Forget G , Campin J M , Heimbach P et al . 2015 . ECCO version 4: an integrated framework for non-linear inverse modeling and global ocean state estimation . Geoscientific Model Development , 8 ( 10 ): 3071 - 3104 , https://doi.org/10.5194/gmd-8-3071-2015 https://doi.org/10.5194/gmd-8-3071-2015 .

Gill A E , Niller P P . 1973 . The theory of the seasonal variability in the ocean . Deep Sea Research and Oceanographic Abstracts , 20 ( 2 ): 141 - 177 , https://doi.org/10.1016/0011-7471(73)90049-1 https://doi.org/10.1016/0011-7471(73)90049-1 .

Hannachi A , Jolliffe I T , Stephenson D B . 2007 . Empirical orthogonal functions and related techniques in atmospheric science: a review . International Journal of Climatology , 27 ( 9 ): 1119 - 1152 , https://doi.org/10.1002/joc.1499 https://doi.org/10.1002/joc.1499 .

Hersbach H , Bell B , Berrisford P et al . 2020 . The ERA5 global reanalysis . Quarterly Journal of the Royal Meteorological Society , 146 ( 730 ): 1999 - 2049 , https://doi.org/10.1002/qj.3803 https://doi.org/10.1002/qj.3803 .

Huang K , McPhaden M J , Wang D X et al . 2018 . Vertical propagation of middepth zonal currents associated with surface wind forcing in the equatorial Indian Ocean . Journal of Geophysical Research : Oceans , 123 ( 10 ): 7290 - 7307 , https://doi.org/10.1029/2018JC013977 https://doi.org/10.1029/2018JC013977 .

Ishizaki H , Nakano H , Nakano T et al . 2014 . Evidence of equatorial Rossby wave propagation obtained by deep mooring observations in the western Pacific Ocean . Journal of Oceanography , 70 ( 6 ): 463 - 488 , https://doi.org/10.1007/s10872-014-0247-3 https://doi.org/10.1007/s10872-014-0247-3 .

Johnson G C , Chambers D P . 2013 . Ocean bottom pressure seasonal cycles and decadal trends from GRACE Release-05: ocean circulation implications . Journal of Geophysical Research : Oceans , 118 ( 9 ): 4228 - 4240 , https://doi.org/10.1002/jgrc.20307 https://doi.org/10.1002/jgrc.20307 .

Kessler W S , McCreary J P . 1993 . The annual wind-driven Rossby wave in the subthermocline equatorial Pacific . Journal of Physical Oceanography , 23 ( 6 ): 1192 - 1207 , https://doi.org/10.1175/1520-0485(1993)023<1192:TAWDRW>2.0.CO;2. https://doi.org/10.1175/1520-0485(1993)023<1192:TAWDRW>2.0.CO;2.

Koelling J , Send U , Lankhorst M . 2020 . Decadal strengthening of interior flow of North Atlantic Deep Water observed by GRACE satellites . Journal of Geophysical Research : Oceans , 125 ( 11 ): e2020 JC 016217 , https://doi.org/10.1029/2020JC016217 https://doi.org/10.1029/2020JC016217 .

Lan J , Wang Y , Cui F J et al . 2015 . Seasonal variation in the South China Sea deep circulation . Journal of Geophysical Research : Oceans , 120 ( 3 ): 1682 - 1690 , https://doi.org/10.1002/2014JC010413 https://doi.org/10.1002/2014JC010413 .

Lan J , Zhang N N , Wang Y . 2013 . On the dynamics of the South China Sea deep circulation . Journal of Geophysical Research : Oceans , 118 ( 3 ): 1206 - 1210 , https://doi.org/10.1002/jgrc.20104 https://doi.org/10.1002/jgrc.20104 .

Landerer F W , Wiese D N , Bentel K et al . 2015 . North Atlantic meridional overturning circulation variations from GRACE ocean bottom pressure anomalies . Geophysical Research Letters , 42 ( 19 ): 8114 - 8121 , https://doi.org/10.1002/2015GL065730 https://doi.org/10.1002/2015GL065730 .

Liu G J , Lan J . 2022 . Distribution of seasonal signals in the deep South China Sea. Deep Sea Research Part I : Oceanographic Research Papers , 190 : 103895 , https://doi.org/10.1016/j.dsr.2022.103895 https://doi.org/10.1016/j.dsr.2022.103895 .

Luo Z P , Yang D Z , Xu L J et al . 2024 . Baroclinic Rossby waves with phase lag cause seasonal upward-propagating signals in the mid-depth equatorial Pacific Ocean . Journal of Geophysical Research : Oceans , 129 ( 5 ): e2023 JC 020418 , https://doi.org/10.1029/2023JC020418 https://doi.org/10.1029/2023JC020418 .

Marin F , Kestenare E , Delcroix T et al . 2010 . Annual reversal of the equatorial intermediate current in the Pacific: observations and model diagnostics . Journal of Physical Oceanography , 40 ( 5 ): 915 - 933 , https://doi.org/10.1175/2009JPO4318.1 https://doi.org/10.1175/2009JPO4318.1 .

Jr McCreary J P . 1984 . Equatorial beams . Journal of Marine Research , 42 ( 2 ): 395 - 430 , https://doi.org/10.1357/002224084788502792 https://doi.org/10.1357/002224084788502792 .

Piecuch C G , Fukumori I , Ponte R M et al . 2015 . Vertical structure of ocean pressure variations with application to satellite-gravimetric observations . Journal of Atmospheric and Oceanic Technology , 32 ( 3 ): 603 - 613 , https://doi.org/10.1175/JTECH-D-14-00156.1 https://doi.org/10.1175/JTECH-D-14-00156.1 .

Ponte R M . 1999 . A preliminary model study of the large-scale seasonal cycle in bottom pressure over the global ocean . Journal of Geophysical Research : Oceans , 104 ( C1 ): 1289 - 1300 , https://doi.org/10.1029/1998JC900028 https://doi.org/10.1029/1998JC900028 .

Qu T D , Girton J B , Whitehead J A . 2006 . Deepwater overflow through Luzon Strait . Journal of Geophysical Research : Oceans , 111 ( C1 ): C 01002 , https://doi.org/10.1029/2005JC003139 https://doi.org/10.1029/2005JC003139 .

Song Y T , Qu T D . 2011 . Multiple satellite missions confirming the theory of seasonal oceanic variability in the northern North Pacific . Marine Geodesy , 34 ( 3-4 ): 477 - 490 , https://doi.org/10.1080/01490419.2011.590110 https://doi.org/10.1080/01490419.2011.590110 .

Thierry V , Mercier H , Treguier A M . 2006 . Seasonal fluctuations in the deep central equatorial Atlantic Ocean: a data-model comparison . Ocean Dynamics , 56 ( 5-6 ): 581 - 593 , https://doi.org/10.1007/s10236-005-0045-y https://doi.org/10.1007/s10236-005-0045-y .

Tian J W , Yang Q X , Liang X F et al . 2006 . Observation of Luzon Strait transport . Geophysical Research Letters , 33 ( 19 ): L 19607 , https://doi.org/10.1029/2006GL026272 https://doi.org/10.1029/2006GL026272 .

Tian J W , Yang Q X , Zhao W . 2009 . Enhanced diapycnal mixing in the South China Sea . Journal of Physical Oceanography , 39 ( 12 ): 3191 - 3203 , https://doi.org/10.1175/2009JPO3899.1 https://doi.org/10.1175/2009JPO3899.1 .

Xu Q B , Zhang L L , Xiao X et al . 2023 . Seasonal link between deepwater overflow through the Luzon Strait and deep western boundary current in the Philippine Sea . Geophysical Research Letters , 50 ( 18 ): e2023 GL 105405 , https://doi.org/10.1029/2023GL105405 https://doi.org/10.1029/2023GL105405 .

Yang Q X , Zhao W , Liang X F et al . 2016 . Three-dimensional distribution of turbulent mixing in the South China Sea . Journal of Physical Oceanography , 46 ( 3 ): 769 - 788 , https://doi.org/10.1175/JPO-D-14-0220.1 https://doi.org/10.1175/JPO-D-14-0220.1 .

Zhou C , Xiao X , Zhao W et al . 2023 . Increasing deep-water overflow from the Pacific into the South China Sea revealed by mooring observations . Nature Communications , 14 ( 1 ): 2013 , https://doi.org/10.1038/s41467-023-37767-4 https://doi.org/10.1038/s41467-023-37767-4 .

Zhou C , Zhao W , Tian J W et al . 2014 . Variability of the deep-water overflow in the Luzon Strait . Journal of Physical Oceanography , 44 ( 11 ): 2972 - 2986 , https://doi.org/10.1175/JPO-D-14-0113.1 https://doi.org/10.1175/JPO-D-14-0113.1 .

Zhu Y H , Yao J X , Xu T F et al . 2022 . Weakening trend of Luzon Strait overflow transport in the past two decades . Geophysical Research Letters , 49 ( 7 ): e2021 GL 097395 , https://doi.org/10.1029/2021GL097395 https://doi.org/10.1029/2021GL097395 .

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