Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong

Xuehai LIU; Yongzhi LIU; Wei CAO; Chengjun SUN

doi:10.1007/s00343-019-8368-6

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Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong

Special Section on Yap Trench | Updated：2023-05-19

- Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong
- Journal of Oceanology and Limnology Vol. 38, Issue 3, Pages: 593-605(2020)
- Affiliations：
  
  1.First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
  2.Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
  3.Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
- Author bio：
  
  LIU Yongzhi, yzliu@fio.org.cn
- Funds：
- DOI：10.1007/s00343-019-8368-6
  CLC：
- Received：27 December 2018，
  
  Accepted：20 February 2019，
  
  Online First：10 June 2019，
  
  Published：2020-03
- Accepted：
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Xuehai LIU, Yongzhi LIU, Wei CAO, et al. Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong[J]. Journal of Oceanology and Limnology, 2020, 38(3): 593-605.
DOI：

Xuehai LIU, Yongzhi LIU, Wei CAO, et al. Water characteristics of abyssal and hadal zones in the southern Yap Trench observed with the submersible Jiaolong[J]. Journal of Oceanology and Limnology, 2020, 38(3): 593-605. DOI： 10.1007/s00343-019-8368-6.

摘要

Abstract

Using observations in an applied cruise of the submersible Jiaolong

water characteristics

geostrophic transport

and turbulent mixing in abyssal and hadal zones of the southern Yap Trench were studied. The spatial structures of deep water show that the abyssal water is cold

saline

and oxygen rich. The hadal water has very small changes in potential temperature and potential density

and a little decrease in salinity and obvious decrease in oxygen. The isotherm

isopycnal

and isohaline are depressed in abyss over the central trench. The turbulent mixing is enhanced in the near-bottom zone and the hadal water on the trench slope

especially at the steep slope

the dissipation rate and diffusivity is strong

which weakens the stratification. The geostrophic flows move southward in the western region of the trench and northward in the eastern region

indicating cyclonic circulation. In the central region of the trench

the water transport is ~1.74 Sv southward. In the hadal zone

the northward and southward transports are balanced. Our analysis suggests that the abyssal water in the southern Yap Trench is from Lower Circumpolar Water (LCPW) and the hadal water seems to be of the isolated local water rather than LCPW.

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Keywords

references

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