The Experts below are selected from a list of 5595 Experts worldwide ranked by ideXlab platform
Toshio Suga - One of the best experts on this subject based on the ideXlab platform.
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subduction of north pacific central mode water associated with subsurface mesoscale eddy
Geophysical Research Letters, 2009Co-Authors: Eitarou Oka, Katsuya Toyama, Toshio SugaAbstract:[1] During a shipboard high-density Hydrographic Survey carried out in the western North Pacific in fall 2008, we observed an anticyclonic eddy with a thickness of 150 dbar and a diameter of 40 km near 500 dbar depth at 27.5°N, 145°E. This subsurface mesoscale eddy contains the North Pacific central mode water (CMW), which has anomalously low potential vorticity and high dissolved oxygen compared to the climatological CMW properties in the same region. Profiling float measurements detect similar CMW patches near and south of the Kuroshio Extension as well as southward CMW migration within the CMW formation region north of the Kuroshio Extension. These observed facts suggest that CMW is subducted into the permanent pycnocline not only through large-scale eastward advection near the northern edge of the subtropical gyre but also through southward cross-frontal advection associated with the formation and migration of subsurface mesoscale eddies.
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New Type of Pycnostad in the Western Subtropical- Subarctic Transition Region of the North Pacific: Transition Region Mode Water
Journal of Oceanography, 2007Co-Authors: Hiroko Saito, Kimio Hanawa, Toshio Suga, Tomowo WatanabeAbstract:A new type of pycnostad has been identified in the western subtropical-subarctic transition region of the North Pacific, based on the intensive Hydrographic Survey carried out in July, 2002. The potential density, temperature and salinity of the pycnostad were found to be 26.5–26.7 σθ, 5°–7°C and 33.5–33.9 psu respectively. The pycnostad is denser, colder and fresher than those of the North Pacific Central Mode Water and different from those of other known mode waters in the North Pacific. The thickness of the pycnostad is comparable to that of other mode waters, spreading over an area of at least 650 × 500 km around 43°N and 160°E in the western transition region. Hence, we refer to the pycnostad as Transition Region Mode Water (TRMW). Oxygen data, geostrophic current speed and climatology of mixed layer depth in the winter suggest that the TRMW is formed regularly in the deep winter mixed layer near the region where it was observed. Analysis of surface heat flux also supports the idea and suggests that there is significant interannual variability in the property of the TRMW. The TRMW is consistently distributed between the Subarctic Boundary and the Subarctic Front. It is also characterized by a wide T-S range with similar density, which is the characteristic of such a transition region between subtropical and subarctic water masses, which forms a density-compensating temperature and salinity front. The frontal nature also tends to cause isopycnal intrusions within the pycnostad of the TRMW.
Liu Yanchun - One of the best experts on this subject based on the ideXlab platform.
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determination of barycenter of Surveying boat in Hydrographic Survey
Geomatics and Information Science of Wuhan University, 2010Co-Authors: Liu YanchunAbstract:In terms of the attitude correction of the sensors position in Hydrographic Survey, determination of the barycenter of the Surveying boat accurately is necessary. Based on the RTK technique, a new method for determination of the barycenter of the Surveying boat is presented and a series model is developed under static state. The simulated results show the calculations and the true values are in a good consistency. The validation and reliability of the new developed approach is verified. The error of the barycenter position of the Surveying boat determined by the observation including RTK noise level can also be neglected.
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methods of determining non position points in Hydrographic Survey
Computer Simulation, 2007Co-Authors: Liu YanchunAbstract:To analyze expressing seafloor topography capability with Survey lines in Hydrographic Survey, several detecting parameters of Survey lines and new concepts were proposed in Survey lines data processing, namely approached representation error, direction bias and displacement bias. Three math models were given for expressing positions of depth points. The transform equation and the transform conditions were brought up among them. Least Squares Collocation (LSC) was introduced during determining Non-position-point (NPP) depth. Some simulations and analyses were carried out. The results demonstrate that the Survey line models are all met to Survey requirements when the detecting parameters of Survey lines are adopted appropriately. Meanwhile, LSC can conveniently determine NPP depth and its precision through using information of local depth field.
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a study of water level control for Hydrographic Survey
Science of Surveying and Mapping, 2006Co-Authors: Bao Jingyang, Liu YanchunAbstract:In this paper,both the vertical datum and the water level correction in Hydrographic Surveys are studied.The time difference model and the model based on the least squares fitting of the water level observations are compared.It is discovered that the parameters of amplitude ratio and time difference between tidal gauge vary with time because the water level are constructed with multi-tidal waves,and it is derived that the chart datum along the stages is linear and which satisfy the requirement of the seamless datum for water level control.Then,a standard for quality control of the water level correction is presented.From this study,some conclusions are given.
Mohd Shalahuddin Adnan - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the effectiveness of existing pond to accommodate storm water runoff in UTHM
International Journal of Integrated Engineering, 2018Co-Authors: Mohd Azlan Mohd Yusoff, Saifullizan Mohd Bukhari, Mohd Shalahuddin AdnanAbstract:Rapid development within UTHM campus has changed the existing earth surface from pervious to impervious layer thus increasing the surface runoff. This study describe the application of XP SWMM software in determining the effectiveness of existing pond to accommodate the increase of storm water runoff based on designated rainfall event. Through this approach, the past studies, related journals, and Storm-water Management Manual (SWMM) are used as a reference for this study. Land and Hydrographic Survey is carried out in order to determine pond profile. The selected study principle using XPSWMM software is based on Rational Method as the catchment area is less than 80 ha and Manning Equation. The existing pond is designed to receive storm water runoff from two different catchments which are area around University Health Centre (PKU) and area starting from Centre for Diploma Studies (PPD) until Information Technology Centre (PTM). The input rainfall data is for 10 years rainfall event (2006-2016). It was found that there are no overflow from the pond, thus the volume for the pond (12356.39m^3) is effective to accommodate increasing storm water runoff from both catchment area.
Mohd Azlan Mohd Yusoff - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the effectiveness of existing pond to accommodate storm water runoff in UTHM
International Journal of Integrated Engineering, 2018Co-Authors: Mohd Azlan Mohd Yusoff, Saifullizan Mohd Bukhari, Mohd Shalahuddin AdnanAbstract:Rapid development within UTHM campus has changed the existing earth surface from pervious to impervious layer thus increasing the surface runoff. This study describe the application of XP SWMM software in determining the effectiveness of existing pond to accommodate the increase of storm water runoff based on designated rainfall event. Through this approach, the past studies, related journals, and Storm-water Management Manual (SWMM) are used as a reference for this study. Land and Hydrographic Survey is carried out in order to determine pond profile. The selected study principle using XPSWMM software is based on Rational Method as the catchment area is less than 80 ha and Manning Equation. The existing pond is designed to receive storm water runoff from two different catchments which are area around University Health Centre (PKU) and area starting from Centre for Diploma Studies (PPD) until Information Technology Centre (PTM). The input rainfall data is for 10 years rainfall event (2006-2016). It was found that there are no overflow from the pond, thus the volume for the pond (12356.39m^3) is effective to accommodate increasing storm water runoff from both catchment area.
Inga J Smith - One of the best experts on this subject based on the ideXlab platform.
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the flow of the antarctic circumpolar current over the north scotia ridge
Deep Sea Research Part I: Oceanographic Research Papers, 2010Co-Authors: Inga J Smith, David P Stevens, Karen J Heywood, Michael P MeredithAbstract:Abstract The transports associated with the Subantarctic Front (SAF) and the Polar Front (PF) account for the majority of the volume transport of the Antarctic Circumpolar Current (ACC). After passing through Drake Passage, the SAF and the PF veer northward over the steep topography of the North Scotia Ridge. Interaction of the ACC with the North Scotia Ridge influences the sources of the Malvinas Current. This ridge is a major obstacle to the flow of deep water, with the majority of the deep water passing through the 3100 m deep gap in the ridge known as Shag Rocks Passage. Volume transports associated with these fronts were measured during the North Scotia Ridge Overflow Project, which included the first extensive Hydrographic Survey of the ridge, carried out in April and May 2003. The total net volume transport northward over the ridge was found to be 117 ± 10 Sv ( 1 Sv = 10 6 m 3 s - 1 ) . The total net transport associated with the SAF was approximately 52 ± 4 Sv , and the total transport associated with the PF was approximately 58 ± 5 Sv . Weddell Sea Deep Water was not detected passing through Shag Rocks Passage, contrary to some previous inferences.
