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Acta Oceanologica Sinica

, Volume 37, Issue 12, pp 1–8 | Cite as

North-south difference of water mass properties across the Lembeh Strait, North Sulawesi, Indonesia

  • Weibo Wang
  • Aijun PanEmail author
  • Kusmanto Edi
  • Hasanudin Muh
  • Sutisna Deny
Article

Abstract

Two field observations were conducted around the Lembeh Strait in September 2015 and 2016, respectively. Evidences indicate that seawater around the Lembeh Strait is consisted of North Pacific Tropical Water (NPTW), North Pacific Intermediate Water (NPIW), North Pacific Tropical Intermediate Water (NPTIW) and Antarctic Intermediate Water (AAIW). Around the Lembeh Strait, there exist some north-south differences in terms of water mass properties. NPTIW is only found in the southern Lembeh Strait. Water mass with the salinity of 34.6 is only detected at 200–240 m between NPTW and NPTIW in the southern Lembeh Strait, and results from the process of mixing between the saltier water transported from the South Pacific Ocean and the lighter water from the North Pacific Ocean and Sulawesi Sea. According to the analysis on mixing layer depth, it is indicated that there exists an onshore surface current in the northern Lembeh Strait and the surface current in the Lembeh Strait is southward. These dramatic differences of water masses demonstrate that the less water exchange has been occurred between the north and south of Lembeh Strait. In 2015, the positive wind stress curl covering the northern Lembeh Strait induces the shoaling of thermocline and deepening of NPIW, which show that the north-south difference of airsea system is possible of inducing north-south differences of seawater properties.

Key words

water mass Lembeh Strait north-south difference 

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Notes

Acknowledgements

Great thanks are given to Zhou Xiwu, Zeng Mingzhang, Li Kai and all crews of R/V Baruna Jaya VIII for their efforts in field survey. Great thanks are given to Chen Bin, Dirham for their efforts in coordination of the research vessel.

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Copyright information

© The Chinese Society of Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Weibo Wang
    • 1
  • Aijun Pan
    • 1
    Email author
  • Kusmanto Edi
    • 2
  • Hasanudin Muh
    • 2
  • Sutisna Deny
    • 2
  1. 1.Ocean Dynamic Laboratory, Third Institute of OceanographyMinistry of Natural ResourcesXiamenChina
  2. 2.Research Center for OceanographyIndonesian Institute of SciencesJakartaIndonesia

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