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  • 332-C0010A; Absolute pressure gauges (APG); Chikyu; DATE/TIME; DRILL; Drilling/drill rig; Exp332; In-situ pressure; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; NanTroSEIZE Stage 2: Riserless Observatory; Temperature, technical  (1)
  • Ocean circulation
Document type
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Years
  • 1
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    Unknown
    A numerical model of mixing and convection driven by surface buoyancy flux (2012)
    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 1989
    Description: This thesis studies mixing and convection in a rectangular basin driven by a specified heat flux at the surface. A numerical model is constructed for this purpose. The main focus of the study is on the density and circulation structure resulting from the thermal forcing. In chapter two, a simple vertical one-dimensional model is developed to examine the mixing processes under a given surface heat flux. In order to simulate strong vertical mixing in the region where stratification is unstable, turbulent processes are modeled by a convective overturning parameterization of eddy viscosity and diffusivity. The results show that the density structure is strongly affected by the convective overturning adjustment as surface cooling prevails, and the resulting density field is nearly depth independent. In chapter three, a more complicated two-dimensional model is constructed to simulate mixing and circulation in a vertical rectangular basin with rigid boundaries. The aspect ratio of the basin ranges from 1 to 0.001 and Rayleigh number from 104 to 2 x 1012. It is found that the circulation pattern is dominated by these two important numbers. The roles of density overturning and density-momentum overturning mixing are further investigated. The results show that the convective overturning not only homogenizes the density field in the unstably stratified region but also contributes to increase the circulation. A crude scale analysis of the system shows that the characteristics of the density and momentum fields from the analysis agree well with the numerical results.
    Keywords: Ocean circulation
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 2
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    Unknown
    Pressure and temperature from the borehole observatory of IODP Hole 332-C0010A (2016)
    PANGAEA
    In:  Supplement to: Wallace, L M; Araki, Eiichiro; Saffer, Demian M; Wang, Xiaoming; Roesner, Alexander; Kopf, Achim J; Nakanishi, A; Power, William L; Kobayashi, R; Kinoshita, Chihiro; Toczko, Sean; Kimura, Toshinori; Machida, Shiki; Carr, Stephanie A (2016): Near-field observations of an offshore Mw 6.0 earthquake from an integrated seafloor and subseafloor monitoring network at the Nankai Trough, southwest Japan. Journal of Geophysical Research: Solid Earth, 121(11), 8338-8351, https://doi.org/10.1002/2016JB013417
    Details
    Publication Date: 2024-02-10
    Description: An Mw 6.0 earthquake struck ~50 km offshore the Kii Peninsula of southwest Honshu, Japan on 1 April 2016. This earthquake occurred directly beneath a cabled offshore monitoring network at the Nankai Trough subduction zone and within 25-35 km of two borehole observatories installed as part of the International Ocean Discovery Program's NanTroSEIZE project. The earthquake's location close to the seafloor and subseafloor network offers a unique opportunity to evaluate dense seafloor geodetic and seismological data in the near field of a moderate-sized offshore earthquake. We use the offshore seismic network to locate the main shock and aftershocks, seafloor pressure sensors, and borehole observatory data to determine the detailed distribution of seafloor and subseafloor deformation, and seafloor pressure observations to model the resulting tsunami. Contractional strain estimated from formation pore pressure records in the borehole observatories (equivalent to 0.37 to 0.15 µstrain) provides a key to narrowing the possible range of fault plane solutions. Together, these data show that the rupture occurred on a landward dipping thrust fault at 9-10 km below the seafloor, most likely on the plate interface. Pore pressure changes recorded in one of the observatories also provide evidence for significant afterslip for at least a few days following the main shock. The earthquake and its aftershocks are located within the coseismic slip region of the 1944 Tonankai earthquake (Mw ~8.0), and immediately downdip of swarms of very low frequency earthquakes in this region, illustrating the complex distribution of megathrust slip behavior at a dominantly locked seismogenic zone.
    Keywords: 332-C0010A; Absolute pressure gauges (APG); Chikyu; DATE/TIME; DRILL; Drilling/drill rig; Exp332; In-situ pressure; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; NanTroSEIZE Stage 2: Riserless Observatory; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 15668 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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