oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 2 )

2019 ( 281 )

2018 ( 1901 )

2017 ( 1800 )

Custom range...

Search Results: 1 - 10 of 120085 matches for " WANG Dongxiao "
All listed articles are free for downloading (OA Articles)
Page 1 /120085
Display every page Item
Estimation of Phytoplankton Responses to Hurricane Gonu over the Arabian Sea Based on Ocean Color Data
Dongxiao Wang,Hui Zhao
Sensors , 2008, DOI: 10.3390/s8084878
Abstract: In this study the authors investigated phytoplankton variations in the Arabian Sea associated with Hurricane Gonu using remote-sensing data of chlorophyll-a (Chl-a), sea surface temperature (SST) and winds. Additional data sets used for the study included the hurricane and Conductivity-Temperature-Depth data. Hurricane Gonu, presenting extremely powerful wind intensity, originated over the central Arabian Sea (near 67.7oE, 15.1oN) on June 2, 2007; it traveled along a northwestward direction and made landfall in Iran around June 7. Before Hurricane Gonu, Chl-a data indicated relatively low phytoplankton biomass (0.05-0.2 mg m-3), along with generally high SST (>28.5 oC) and weak wind (<10 m s-1) in the Arabian Sea. Shortly after Gonu’s passage, two phytoplankton blooms were observed northeast of Oman (Chl-a of 3.5 mg m-3) and in the eastern central Arabian Sea (Chl-a of 0.4 mg m-3), with up to 10-fold increase in surface Chl-a concentrations, respectively. The Chl-a in the two post-hurricane blooms were 46% and 42% larger than those in June of other years, respectively. The two blooms may be attributed to the storm-induced nutrient uptake, since hurricane can influence intensively both dynamical and biological processes through vertical mixing and Ekman Pumping.
The pathway of the interdecadal variability in the Pacific Ocean
Dongxiao Wang,Zhengyu Liu
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02886211
Abstract: Cases of the interdecadal variability in the Pacific Ocean and their evolution were examined in the paper with the statistic methods (CEOF and composite analysis) over the period of 1950–1993. Observations of oceanic temperatures in the upper 400 m revealed an obvious region of the interdecadal signals in the central North Pacific. Such signals propagated southwestward, then subducted to the subtropics. The hypothesized link for interdecadal oceanic variability between the subtropics and the tropics, especially with the western tropical Pacific was unraveled in order to detect the cause of decadal signals in the tropics. The thermal anomalies subducted in the central North Pacific east to the dateline only reach 18°N. There has been no further southward propagation since then due to a certain barrier. The origin of the interdecadal signals in the western tropical Pacific was traced to the southern tropical Pacific. There is a meridional pathway around the dateline where the signals were loaded. These variabilities were in the nature of the thermocline circulation.
Diagnostic analysis on the northern South China Sea winter counter-wind current
Bo Hong,Dongxiao Wang
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-9009-y
Abstract: The winter counter-wind current (also named the South China Sea Warm Current (SCSWC)) in the northern South China Sea (SCS) has been known well for decades, but its mass and momentum origination have not be quantitatively evaluated before. In this paper, the high resolution three-dimensional ocean circulation model is adopted to reproduce the circulation in the northern SCS. The diagnostic analyses are performed to investigate the momentum budget in the northern SCS continental shelf/slope and the momentum propulsion of the SCSWC. It is indicated that the across-shelf pressure gradient and the across-shelf transport are responsible for the formation of the SCSWC, while the along-shelf pressure gradient is balanced by the surface stress, bottom stress, and Coriolis force. The magnitude of the terms in the along-shelf momentum equation is smaller than that in the across-shelf one. The analysis on the momentum budget in the northern SCS will benefit the marine environmental prediction in the future.
Estimation of Phytoplankton Responses to Hurricane Gonu over the Arabian Sea Based on Ocean Color Data
Dongxiao Wang,Hui Zhao
Sensors , 2008,
Abstract: In this study the authors investigated phytoplankton variations in the Arabian Sea associated with Hurricane Gonu using remote-sensing data of chlorophyll-a (Chl-a), sea surface temperature (SST) and winds. Additional data sets used for the study included the hurricane and Conductivity-Temperature-Depth data. Hurricane Gonu, presenting extremely powerful wind intensity, originated over the central Arabian Sea (near 67.7 oE, 15.1 oN) on June 2, 2007; it traveled along a northwestward direction and made landfall in Iran around June 7. Before Hurricane Gonu, Chl-a data indicated relatively low phytoplankton biomass (0.05-0.2 mg m-3), along with generally high SST (>28.5 oC) and weak wind (<10 m s-1) in the Arabian Sea. Shortly after Gonu ¢ € s passage, two phytoplankton blooms were observed northeast of Oman (Chl-a of 3.5 mg m-3) and in the eastern central Arabian Sea (Chl-a of 0.4 mg m-3), with up to 10-fold increase in surface Chl-a concentrations, respectively. The Chl-a in the two post-hurricane blooms were 46% and 42% larger than those in June of other years, respectively. The two blooms may be attributed to the storm-induced nutrient uptake, since hurricane can influence intensively both dynamical and biological processes through vertical mixing and Ekman Pumping.
Combination of Text Mining and Corrective Neural Network in Short-term Load Forecasting
DongXiao Niu,JianJun Wang
Journal of Computers , 2009, DOI: 10.4304/jcp.4.12.1188-1194
Abstract: Short-term load forecasting refers to short period load prediction of utility ranging from one hour to several days ahead. It is meaningful in planning and dispatching the load to meet the electricity system demand. The inaccuracy load forecasting can increase the electricity operating costs. In this paper, a novel method is presented and discussed which combines text mining and corrective neural network (TM-CNN) methods. Subsequently, a numeric example of daily maximum load forecasting is used to illustrate the performance of TM-CNN method, and the experiment results also reveal that TM-CNN method outperforms the autoregressive moving average(ARMA) and BP Artificial Neural Network(BPNN) approaches.
Sensitivity Study of the Seasonal Mean Circulation in the Northern South China Sea
HONG Bo,WANG Dongxiao,
HONG Bo
,WANG Dongxiao

大气科学进展 , 2008,
Abstract: A study of the circulation in the northern South China Sea (SCSl is carried out with the aid of a three-dimensional.high.resolution regional ocean model.One control and two sensitivity experiments are performed to qualitatively investigate the effects of surface wind forcing,Kuroshio intrusion,and bottom topographic influence Oll the circulation in the northern SCS.The model results show that a branch of the Kuroshio in the upper layer can intrude into the SCS and have direct influence on the circulation over the continental shelf break in the northern SCS.There are strong southward pressure gradients along a zonal belt largely seaward of the continental slope.The pressure gradients are opposite in the southern and northern parts of the Luzon Strait,indicating inflow and outfow through the strait,respectively.The sensitivity experiments suggest that the Kuroshio intrusion is responsible for generating the imposed pressure head along the shelf break and has no obvious seasonal variations.The lateral forcing through the Luzon Strait and Taiwan Strait can induce the southwestward slope current and the northeastward SCS Warm Current in the northern SCS.Without the lateral forcing.there is no high-pressure-gradient zonal belt seaward of the continental slope.The wind forcing mainly causes the seasonal variation of the circulation in the SCS. The wind-induced water pile-up results in the southward high pressure gradient along the northwestern boundary of the basin.Without the blocking of the plateau around Dongsha Islands.the intruded Kuroshio tends to extend northwest and the SCS branch of the Kuroshio becomes wider and stronger.The analyses presented here are qualitative in nature but should lead to a better understanding of the oceanic responses in the northern SCS to these external influence factors.
Evidence for thermocline ventilation in the South China Sea in winter
Dongxiao Wang,Yan Du,Ping Shi
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03187221
Abstract: Based on analysis of Levitus data in the South China Sea (SCS), this note addresses the seasonal feature of the mixed layer and thermocline in the northern SCS in winter, and demonstrates thermocline ventilation during the winter period. The ventilated thermocline is isopycnic layers between sigma 22.0 and 23.5, the other layers beneath is not ventilated yet. The process of thermocline ventilation is accompanied by detrainment water from the mixed layer into the thermocline at the outeropping line and moves to the south. Forced by subduction, the seasonal southward propagating signal also appears in the unventilated thermocline. The horizontal component of the signal propagates along the isoline of potential vorticity (PV), in other words, moves around a seasonal PV pool.
Interdecadal variability in the tropical Indian Ocean and its dynamic explanation
Dongxiao Wang,Guoxiong Wu,Jianjun Xu
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02886106
Abstract: Interdecadal variability in the tropical Indian Ocean has been analyzed based on the long-term climatic observational data. Case study showed that strong interannual signals formed at the surface can penetrate the depth of seasonal thermocline, where the anomalies last a couple of years. Artificial time series based on damping with exponential decay of selected strong events agree well with the detected interdecadal variability in the tropical Indian Ocean. A possible dynamic explanation for interdecadal variability in the tropical Indian Ocean was proposed that irregular interannual signals can lead to a slowly evolving climatic background with the interdecadal time scale through damping of the memory about anomalies in the seasonal thermocline.
The assimilation experiment in the southwestern South China Sea in summer 2000
Xianjun Xiao,Dongxiao Wang,Jianjun Xu
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-9031-4
Abstract: We performed an assimilation experiment of the southern South China Sea in summer 2000, and the altimeter data were assimilated into Princeton Ocean Model (POM). The result was evaluated with the in situ data. There were obvious improvements of the currents in the southern South China Sea, and the modeling uncertainty coming from the error of wind stress forcing was reduced. This experiment provides us a new idea about improving the modeling of the ocean currents.
Implication of the South China Sea Throughflow for the Interannual Variability of the Regional Upper-Ocean Heat Content

LIU Qinyan,Ruixin HUANG,WANG Dongxiao,

大气科学进展 , 2012,
Abstract: In this study the interannual variability of the upper-ocean heat content in the South China Sea (SCS) was revisited using simple ocean data assimilation (SODA) combined with objective analyzed data sets that included the horizontal and vertical structures. The results confirmed that the upper-ocean heat content in the SCS is lower than normal during the mature phase of El Ni?o events, and two super El Ni?o events, 1982/1983 and 1997/1998 were also included. The variability of the heat content was consistent with the variability of the dynamic height anomalies. The SCS throughflow (SCSTF) plays an important role in regulating the interannual variability of the heat content, especially during the mature phase of El Ni?o events.
Page 1 /120085
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.