Study on the amplitude inversion of internal waves at Wenchang area of the South China Sea

Zhang, Xudong; Wang, Jing; Sun, Lina; Meng, Junmin

doi:10.1007/s13131-016-0902-1

Cited by 22 publications

(6 citation statements)

References 13 publications

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“…However, the mass ratio of total organic carbon and total sulfur (C/S ratio, R 2 = 0.8) is a more sensitive proxy for seawater intrusion than organic carbon isotope (R 2 = 0.1), total organic carbon, and total nitrogen (R 2 = 0.6). Similarly, interpretations obtained by examining TOC concentration, TOC/TN, and TOC/TS in the HZW1907 core are consistent with those obtained from interpretations of the ratio of Mg/Ti, which has been used to examine paleoclimate changes (see Figures 7D-F;Nesbitt and Young, 1982;Roy and Roser, 2013;Zhang et al, 2013;Gao et al, 2023). The changes in Mg/Ti objectively reflect climatic variations in the source area, which is affected by the evolution of the East Asian monsoon (refer to Figure 6; Wang et al, 2001;Rasmussen et al, 2014;Tao et al, 2016;Cheng et al, 2020;Zhou et al, 2022).…”

Section: The Evolution Of Sulfur: Its Use As a Paleosalinity Archivesupporting

confidence: 73%

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Gao,

Piotrowski,

et al. 2024

Front. Mar. Sci.

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The correlation between the amount of organic carbon (OC) and sulfur (S) in sediments has been widely used as a paleosalinity indicator to distinguish between marine and freshwater environments. However, whether the ratio of total OC to total S (TOC/TS) can be used to identify unsteady or dynamic marine environments across sedimentary strata is still contended. An HZW1907 sediment core of 80 m in length was successfully collected in the middle of Hangzhou Bay (HZB), serving as one of the few boreholes that are crucial for the study of geologic and geo-environment changes in the coastal regions of eastern China since the Last Glacial Maximum (LGM). Total OC (TOC), stable carbon isotope, and TS of 82 subsamples from the HZW1907 core were analyzed to reconstruct the history of the shallow water biological pump and sulfur preservation record in the bay since the Late Pleistocene. Our results indicate that the samples had low concentrations of TOC (0.21%) and total nitrogen (TN) (0.02%), high mass ratio of TOC/TN (10.8), low δ13C (−24.9‰), low TS content (0.06%), and a high ratio of TOC/TS (9.1) from 33.6 ka BP to 12.3 ka BP, implying that freshwater organic matter (OM), algae, and C3 plant fragments were the main sources of OM in a relatively cold environment. The abundances of TOC, TN, and TS increased to 0.56%, 0.07%, and 0.4%, respectively, while δ13C (−23.9‰) increased and TOC/TS (2.7) decreased in the Holocene sediments, suggesting that seawater began to influence the composition of the sediments of HZB. Climate warming, which is likely to have impacted the results, was experienced from 12.3 ka BP. An OC isotope mixing model indicated that since the Mid-late Holocene, more than 70% of riverine OM accounted for the total OM. The TOC/TS ratio was identified as an effective indicator of seawater intrusion, with C/S ratios of 1–6 being considered to indicate a “sea–land transitional zone” sedimentary environment, a C/S >6 indicating freshwater, and a C/S<1 indicating normal marine facies. These findings provide crucial evidence for using TOC/TS to distinguish freshwater from marine environments and enhance our understanding of past climate changes. Therefore, these geochemical indicators can be used in conjunction with other sedimentary records to obtain accurate results about sedimentary evolution.

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Section: The Evolution Of Sulfur: Its Use As a Paleosalinity Archivesupporting

confidence: 73%

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Gao,

Piotrowski,

et al. 2024

Front. Mar. Sci.

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“…The distance between the positive and negative peaks, i.e., peak-to-peak (PP) distance, can be extracted from satellite images. Previous studies have proven that the PP distance is closely related to IW amplitude (Zheng et al, 2001;Zhang et al, 2016). Therefore, the PP distance extracted from satellite images is expected to build the relationship with IW amplitude extracted from in-situ data.…”

Section: Experimental Lab Datamentioning

confidence: 98%

“…In this study, MODIS images with a spatial resolution of 250 m were mainly used for collecting the synchronous observation dataset. Several synthetic aperture radar (SAR) images, such as ENVISAT ASAR images and Radarsat-2 images, collected in the South China Sea were also used to build the matched dataset (Zhang et al, 2016).…”

Section: Experimental Lab Datamentioning

confidence: 99%

Oceanic internal wave amplitude retrieval from satellite images based on a data-driven transfer learning model

Zhang

Wang

et al. 2022

Remote Sensing of Environment

Self Cite

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“…The near water area and inundation area of the pile legs of MOPU platform usually have a large number of parasitic Marine organisms, especially the parasitic layer thickness of the platform operating in the South China Sea area is more than 9 cm. Too thick attached Marine organisms will corrode the outer wall of the pile leg, interfere with the normal outflow field, change the mechanical structure of the platform, and bury serious hidden dangers to the production safety of offshore oil and gas [2] [3]. Therefore, the research on cleaning the attached Marine organisms on the offshore platform is a hot topic in recent years.…”

Section: Introductionmentioning

confidence: 99%

Structure Design Of ROV-Based MOPU Platform Pin Hole Spin Cleaning Device

Hou

2024

HSET

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The pile legs of the MOPU platform have been submerged in seawater for a long time, and there are a large number of Marine organisms on the surface, which has a negative impact on the stability of the platform and needs to be cleaned regularly. Most of the existing jacket cleaning technologies are aimed at cleaning the outer surface, and there are few studies on cleaning the Marine organisms attached to the pin holes of the pile legs of MOPU platform. In order to solve the above problems, this paper firstly designs a spin-type pin hole cleaning device based on underwater wall-climbing robot by drawing lessons from domestic and foreign experience. At the same time, the Fluent simulation of three commonly used cavitation water jet nozzles is carried out, and the most suitable nozzle type for pin hole cleaning is selected from the organ pipe type, shear type and corner cavitation nozzles. In the actual operation, the water temperature and depth around the ROV are changing, so the simulation needs to consider the influence of temperature and depth changes. In this paper, a reasonable point is put forward for the structural design of the spin cavitation cleaning device. The simulation results show that the corner cavitation nozzle should be selected in the pinhole cleaning operation.

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Study on the amplitude inversion of internal waves at Wenchang area of the South China Sea

Cited by 22 publications

References 13 publications

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Geochemical behavior of C, N, and S in sediments of Hangzhou Bay, Southeastern China: implications for the study of paleoclimate and sea-level changes

Oceanic internal wave amplitude retrieval from satellite images based on a data-driven transfer learning model

Structure Design Of ROV-Based MOPU Platform Pin Hole Spin Cleaning Device

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