Zhiwei Zhang

Zhiwei Zhang
Ocean University of China | OUC · Key Laboratory of Physical Oceanography

Phd

About

43
Publications
27,772
Reads
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1,001
Citations
Additional affiliations
January 2019 - present
Ocean University of China
Position
  • Professor (Associate)
July 2016 - December 2018
Ocean University of China
Position
  • Professor (Assistant)
September 2011 - June 2016
Ocean University of China
Position
  • PhD Student

Publications

Publications (43)
Article
In Spring 2014, two subthermocline eddies (STEs) were observed by rapid-sampling Argo floats in the subtropical northwestern Pacific (STNWP). The first one is a warm, salty, and oxygen-poor lens, with its temperature/salinity /dissolved oxygen (T/S/DO) anomalies reaching 1.16°C/0.21psu/−29.9μmol/kg, respectively, near the 26.62 sig0 surface. The ot...
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Full-text available
Oceanic mesoscale eddies with horizontal scales of 50-300 km are the most energetic form of flows in the ocean. They are the oceanic analogues of atmospheric storms and are effective transporters of heat, nutrients, dissolved carbon, and other biochemical materials in the ocean. Although oceanic eddies have been ubiquitously observed in the world o...
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Sheddings of Kuroshio loop current (KLC) eddies in the northeastern South China Sea (SCS) are investigated using mooring-arrays, multiple satellite data, and data-assimilative HYCOM products. Based on altimeter sea surface heights between 1992–2014, a total of 19 prominent KLC eddy shedding (KLCES) events were identified, among which four events we...
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Turbulent mixing, which is critically important for the equilibrium of ocean circulation, is controlled by finescale turbulent shear (S2) of oceanic flows through shear instability. Although the relationship between S2 and mixing is well understood, the latitude-dependent generation processes of S2 remain poorly known due to the lack of geographica...
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Although observational efforts have been made to detect submesoscale currents (submesoscales) in regions with deep-mixed layers and/or strong mesoscale kinetic energy (KE), there have been no long-term submesoscale observations in subtropical gyres, which are characterized by moderate values of both mixed-layer depths and mesoscale KE. In order to...
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Mesoscale eddies are active in the northeastern South China Sea (NESCS) and play an important role in the oceanic energy balance therein. In this study, the budgets of mesoscale eddy kinetic energy (EKE) in the NESCS were explored by simultaneously considering the interactions with both large-scale and submesoscale processes based on high-resolutio...
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Plain Language Summary Water‐mass transports in the vast and seemingly quiescent abyssal ocean, basically along topographically‐guided pathways, play a pivotal role in the Earth's climate. In the North Pacific, the knowledge on the Yap‐Mariana Junction (YMJ), an exclusive choke point through which the Lower Circumpolar Deep Water (LCDW), the abyssa...
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A train of subsurface mesoscale eddies (SMEs) consisting of two cyclones and two anticyclones was observed in the northeastern South China Sea (NESCS) in 2015 by a mooring array. In contrast to the widely reported surface-intensified eddies, the SMEs had weak surface signals but showed maximum velocity at ∼370 m with a magnitude of 17.2 cm s ⁻¹ . T...
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Although submesoscale coherent vortices (SCVs) have been observed in different parts of the world’s oceans, most of them were captured by accident by a limited number of hydrographic profiles. Here, using concurrent velocity and temperature/salinity measurements from a submesoscale-resolving mooring array (2-km), two oppositely-rotating SCVs are fo...
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Turbulent mixing above rough topography is crucial for the vertical motions of deep water and the closure of the meridional overturning circulation. Related to prominent topographic features, turbulent mixing not only exhibits a bottom-intensified vertical structure but also displays substantial lateral variation. How turbulent mixing varies in the...
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The temporal variability of internal solitary waves (ISWs) in the northern South China Sea (SCS) is examined from hourly to interannual timescales based on nearly four-year-long measurements from the SCS Mooring Array between August 2010 and June 2014. On an hourly timescale, large ISWs tend to occur at the moorings around certain hours due to the...
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Although submesoscale processes are revealed to have a strong seasonality in many regions of global ocean, their seasonal modulation in the northeastern South China Sea (NESCS) remains unexplored by observations. In this study, approaches to diagnose submesoscale kinetic energy (KE) and its conversion terms using data from a single mooring are prop...
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The complex behaviors of internal solitary waves (ISWs) in the Andaman Sea were revealed using data collected over nearly 22-month-long observation period completed by two moorings. Emanating from the submarine ridges northwest of Sumatra Island and south of Car Nicobar, two types of ISWs, referred to as S- and C-ISWs, respectively, were identified...
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Plain Language Summary Steric height (SH) is a key component of sea surface height (SSH) that arises from multiscale processes such as mesoscales, submesoscales, and internal gravity waves (IGWs). A quantitative understanding on constituents of SH is a prerequisite to explore ocean dynamics using satellite‐derived SSH data. Based on moored temperat...
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Subthermocline eddies (STEs), also termed intra-thermocline eddies or submesoscale coherent vortices, are lens-shaped eddies with anomalous water properties located in or below the thermocline. Although STEs have been discovered in many parts of the world ocean, most of them were observed accidentally in hydrographic profiles, and direct velocity m...
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Based on long-term mooring-array and satellite observations, three-dimensional structure and interannual variability of the Kuroshio Loop Current (KLC) in the northeastern South China Sea (SCS) were investigated. The 3-year moored data between 2014–2017 revealed that the KLC mainly occurred in winter and it exhibited significant interannual variabi...
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Sea surface winds and water transports through the Luzon Strait (LS) are two main factors that force the circulations in the South China Sea (SCS). Typically, a sandwich‐like inflow‐outflow‐inflow structure in the LS and a corresponding three‐layer cyclonic‐anticyclonic‐cyclonic circulation structure in the SCS have been identified. In this study,...
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The intensity of deep‐ocean mixing critically shapes the global overturning circulation, but the energy cascade participating in the elevated mixing above rough topography remains poorly understood. Using 350‐day moored observations, the energy cascade triggered by eddy‐topography interactions is for the first time revealed in the deep South China...
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Although both geostrophic balanced mesoscale eddies and unbalanced small‐scale processes have been well studied in the northeastern South China Sea (NE‐SCS), less attention has been devoted to the submesoscales in between (i.e. O(10 km)), which is recognized as an important conduit connecting the balanced and unbalanced motions. Based on the output...
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The South China Sea (SCS) is a large marginal sea connecting the Indian and Pacific oceans. Under the factors of monsoons, strait transport, and varied bathymetry, the SCS presents a three-layer structure and strong diapycnal mixing which is far greater than that in the open ocean. Theoretical analysis and observations reveal that internal tides, i...
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Subtidal motions, such as large-scale circulations and mesoscale eddies, frequently occupy on the propagation path of internal waves in the ocean. Through solving a modified Taylor–Goldstein equation with subtidal currents, density stratification, and the earth rotation, this study investigates the impacts of subtidal motions and the earth rotation...
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Diapycnal mixing plays an important role in modulating upper-ocean heat content of the western equatorial Pacific (WEP) that profoundly impacts the global climate. Given the sparsity of long-term in situ observations, the mechanism driving thermocline mixing in the WEP remains poorly understood. Here, based on year-long mooring measurements in the...
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The deep water overflow at three gaps in the Heng-Chun Ridge of the Luzon Strait is investigated based on long-term continuous mooring observations. For the first time, these observations enable us to assess the detailed structure and variability in the deep water overflow directly spilling into the South China Sea (SCS). The strong bottom-intensif...
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Abstract One-year time series of current velocities and hydrographic parameters based on four deep moorings deployed east of the Luzon Strait are employed to study the deep current at the western boundary (DCWB) of the northern Philippine Basin. While the mean current is relatively weak, the DCWB is highly variable on an intraseasonal time scale, w...
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The role of mesoscale eddies in modulating the semidiurnal internal tide (SIT) in the northern South China Sea (SCS) is examined using the data from a cross-shaped mooring array. From November 2013 to January 2014, an anticyclonic eddy (AE) and cyclonic eddy (CE) pair crossed the westward SIT beam originating in Luzon Strait. Observations showed th...
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Spatiotemporal variations in internal solitary wave (ISW) polarity over the continental shelf of the northern South China Sea (SCS) were examined based on mooring-array observations from October 2013 to June 2014. Depression ISWs were observed at the easternmost mooring, where the water depth is 323 m. Then, they evolved into elevation ISWs at the...
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Temperature, nutrients, and salinity are among the important factors constraining the distribution and abundance of microorganisms in the ocean. Marine Group II (MGII) belonging to Euryarchaeota commonly dominates the planktonic archaeal community in shallow water and Marine Group I (MGI, now is called Thaumarchaeota) in deeper water in global ocea...
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Both internal solitary waves (ISWs) and mesoscale eddies are ubiquitous in the northern South China Sea (SCS). In this study, we examine the impacts of mesoscale eddies on the ISWs transiting the northern SCS deep basin which evolve from the steepening internal tide generated in Luzon Strait, using in situ data collected from a specifically-designe...
Article
In this study, statistical characteristics of the cold-core subthermocline eddies (STEs) discovered by Zhang et al. [2015] in the northwestern Pacific are further investigated with 14-year Argo temperature/salinity (T/S) data between 2002–2015. By applying an objective identification procedure to Argo T/S profiles, a total of 337 lens-like STEs tha...
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Oceanic mesoscale eddies with typical sizes of 30–200 km contain more than half of the kinetic energy of the ocean. With an average lifespan of several months, they are major contributors to the transport of heat, nutrients, plankton, dissolved oxygen and carbon in the ocean. Mesoscale eddies have been observed and studied over the past 50 years, n...
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With characteristics of large amplitude and strong current, internal solitary wave (ISW) is a major hazard to marine engineering and submarine navigation; it also has significant impacts on marine ecosystems and fishery activity. Among the world oceans, ISWs are particular active in the northern South China Sea (SCS). In this spirit, the SCS Intern...
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Interannual modulation of eddy kinetic energy (EKE) in the northeastern South China Sea (NE-SCS) is investigated based on outputs of an eddy-resolving oceanic general circulation model between 1980–2014. The EKE displays distinct interannual modulations with periods between 1.5 and 7 years. The maximum peak-to-trough amplitude of the interannual mo...
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The current in the northeastern South China Sea (NSCS) has been extensively studied by both observations and numerical models, but its vertical structure and temporal variability are still not well understood because of the lack of long-term and full-depth direct observations. From August 2010 to March 2013, the current velocity in the NSCS was dir...
Article
One-year long, full-depth velocity measurements were used to examine the spatial structure and temporal variability of the zonal flow in the Luzon Strait (LSZF). The observation revealed a renewed mean flow structure: in the upper (< 500 m) and deep (>2000 m) layers, the LSZF was mostly westward; in the intermediate layer (500–2000 m), it was domin...
Article
A pair of mesoscale eddies, namely, an anticyclonic eddy (AE) and a cyclonic eddy (CE), generated southwest of Taiwan was investigated using long-term moored observations augmented with satellite and reanalysis data. AE (CE) increased the upper-ocean current to 100 cm/s (50 cm/s) and generated temperature anomaly (T) up to 7.5 degrees C (-3.0 degre...

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Projects

Projects (2)
Project
The first goal of this project is to adopt multiple observation data to reveal the 3D structure and tracer transports of mesoscale eddies in the ocean. The second goal is to investigate the interaction between mesoscale eddies with larger- and smaller-scale processes and the accompanying energy cascade based on observations, simulations, and GFD theories.
Project
To explore dynamic characteristis, generation and evolution mechanisms of submesoscale currents as well as their roles in tracer transport and energy cascade in the ocean.