Vertical distribution characteristics and influencing factors of suspended matter in the Sansha Yongle Blue Hole, South China Sea

Yan Wenwen; Gu Dongqi; Du Jun; Li Ping; Ming Jie; Yu Xiaoxiao; Li Jiankun; Wang Enkang; Xu Guoqiang

doi:10.3969/j.issn.0253-4193.2019.11.011

Volume 41 Issue 11

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Yan Wenwen，Gu Dongqi，Du Jun, et al. Vertical distribution characteristics and influencing factors of suspended matter in the Sansha Yongle Blue Hole, South China Sea[J]. Haiyang Xuebao，2019, 41(11)：117–126，doi:10.3969/j.issn.0253−4193.2019.11.011

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Vertical distribution characteristics and influencing factors of suspended matter in the Sansha Yongle Blue Hole, South China Sea

doi: 10.3969/j.issn.0253-4193.2019.11.011

1.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
School of Foreign Languages, Qingdao University, Qingdao 266071, China
3.
Key Laboratory of Coast and Island Development, Ministry of Education, Nanjing University, Nanjing 210023, China

Received Date: 2018-10-31
Rev Recd Date: 2019-04-10

Available Online: 2021-04-21

Publish Date: 2019-11-25

Abstract

Abstract

In order to study the formation, development and evolutionary mechanism of the only known marine blue hole in China, also the deepest one in the world, we used the LISST-100X and CTD carried by remote operated vehicle for the measurement of suspended matter and the profile of temperature and salinity in the Sansha Yongle Blue Hole in May 2017. We acquired the data of the volume concentration of suspended matter, temperature, salinity and dissolved oxygen, then we conducted the study of the vertical distribution characteristics of suspended matter. The results indicate that the water below 90 m of the cave is anaerobic and the concentration of suspended matter presents 5 cycle changes. The results also indicate that there are three thermoclines and three haloclines in the Sansha Yongle Blue Hole, and there is a good correspondence between them. The total concentration of suspended matter in the surface water is about 20 μL/L, and the average concentration of suspended matter is 5.93 μL/L. CyclothemⅠlies at 5 m in shallow water layer; cyclothemⅡlies between 10 m and 43 m below the water surface, partially corresponding to the first thermocline and halocline water depth (10–20 m); cyclothem Ⅲ lies between 70 meters to 110 m at depth, completely corresponding to the second thermocline and halocline (water depth 70–110 m); cyclothem Ⅳ lies between 130 m to 150 m, completely corresponding to the third thermocline and halocline (water depth 130–150 m); cyclothemⅤlies in 260 m and then deep to 300 m. The suspended matter concentration on the surface is high, as is mainly affected by the sediment input from the surrounding coral reefs. The vertical distribution characteristics of suspended matter in the Sansha Yongle Blue Hole is mainly controlled and affected by hydrodynamic force, cave morphology, thermocline, halocline, dissolved oxygen content and plankton.
- Sansha Yongle Blue Hole,
- suspended matter,
- thermocline,
- halocline,
- vertical distribution,
- influencing factors

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