GuiJun Han

chapter

Conflict Analysis of Multi-source SST Distribution

Lingyu Xu, Pingen Zhang, Jun Xu, Shaochun Wu, more

Lecture Notes in Computer Science > High Performance Computing and Applications > Contributed Papers > 479-484

This article focuses on evaluating the quality of sea surface temperature (SST) observed by satellite remote sensing. Due to the Grubbs test’s limitations [1] when analyzing multi-source satellites SST, an improved algorithm is proposed, which is found to be more effective than the traditional variance method when quantifying the differences and conflicts of SST. And the improved method is applied...

article

Correction of biased climate simulated by biased physics through parameter estimation in an intermediate coupled model

Xuefeng Zhang, Shaoqing Zhang, Zhengyu Liu, Xinrong Wu, more

Climate Dynamics > 2016 > 47 > 5-6 > 1899-1912

Imperfect physical parameterization schemes are an important source of model bias in a coupled model and adversely impact the performance of model simulation. With a coupled ocean-atmosphere-land model of intermediate complexity, the impact of imperfect parameter estimation on model simulation with biased physics has been studied. Here, the biased physics is induced by using different outgoing longwave...

article

A study of the impact of parameter optimization on ENSO predictability with an intermediate coupled model

Xinrong Wu, Guijun Han, Shaoqing Zhang, Zhengyu Liu

Climate Dynamics > 2016 > 46 > 3-4 > 711-727

Model error is a major obstacle for enhancing the forecast skill of El Niño-Southern Oscillation (ENSO). Among three kinds of model error sources—dynamical core misfitting, physical scheme approximation and model parameter errors, the model parameter errors are treatable by observations. Based on the Zebiak-Cane model, an ensemble coupled data assimilation system is established to study the impact...

article

Impact of sea spray on upper ocean temperature during typhoon passage: simulation with a 1-D turbulent model

Lianxin Zhang, Xuefeng Zhang, Guijun Han, Xinrong Wu, more

Chinese Journal of Oceanology and Limnology > 2015 > 33 > 5 > 1164-1180

At the interface between the lower atmosphere and sea surface, sea spray might significantly influence air-sea heat fluxes and subsequently, modulate upper ocean temperature during a typhoon passage. The effects of sea spray were introduced into the parameterization of sea surface roughness in a 1-D turbulent model, to investigate the effects of sea spray on upper ocean temperature in the Kuroshio...

article

Effects of Stokes production on summer ocean shelf dynamics

Xuefeng Zhang, Guijun Han, Xidong Wang, Lianxin Zhang

Acta Oceanologica Sinica > 2014 > 33 > 1 > 24-34

A two-dimensional numerical model, which is configured on the basis of Princeton ocean model (POM), is used to study the effect of Stokes production (SP) of the turbulent kinetic energy on a density profile and Ekman transport in an idealized shelf region in summer. The energy input from SP is parameterized and included into the Mellor-Yamada turbulence closure submodel. Results reveal that the intensity...

article

A numerical estimation of the impact of Stokes drift on upper ocean temperature

Xiaoshuang Zhang, Zhifeng Wang, Bin Wang, Kejian Wu, more

Acta Oceanologica Sinica > 2014 > 33 > 7 > 48-55

The impact of Stokes drift on the mixed layer temperature variation was estimated by taking into account an advective heat transport term induced by the Stokes drift in the equation of mixed layer temperature and using the oceanic and wave parameters from a global ocean circulation model (HYCOM) and a wave model (Wave Watch III). The dimensional analysis and quantitative estimation method were conducted...

article

A study of transport and impact strength of Fukushima nuclear pollutants in the north pacific surface

Hongli Fu, Wei Li, Xuefeng Zhang, Guijun Han, more

Journal of Ocean University of China > 2014 > 13 > 2 > 183-190

Based on the statistics of surface drifter data of 1979–2011 and the simulation of nuclear pollutant particulate movements simulated using high quality ocean reanalysis surface current dataset, the transport pathways and impact strength of Fukushima nuclear pollutants in the North Pacific have been estimated. The particulates are used to increase the sampling size and enhance the representativeness...

article

Effects of tropical cyclones on large-scale circulation and ocean heat transport in the South China Sea

Xidong Wang, Chunzai Wang, Guijun Han, Wei Li, more

Climate Dynamics > 2014 > 43 > 12 > 3351-3366

In this study, we investigate the influence of tropical cyclones (TCs) on large-scale circulation and ocean heat transport in the South China Sea (SCS) by using an ocean general circulation model at a 1/8° resolution during 2000–2008. The model uses a data assimilation system to assimilate observations in order to improve the representation of SCS circulation. The results reveal an unexpected deep...

article

Salinity drift of global Argo profiles and recent halosteric sea level variation

Xidong Wang, Guijun Han, Wei Li, Xinrong Wu, more

Global and Planetary Change > 2013 > 108 > Complete > 42-55

A salinity sensor drift in the Array for Real-time Geostrophic Oceanography (Argo) float has been identified. In the present study the salinity calibration results for global Argo floats indicate that an upper 900dbar averaged-positive salinity drift appears during the floats' operating period from January 2001 to December 2010. These offsets are shown to cause an uncertainty in the estimate of the...

article

Improvement of short-term forecasting in the northwest Pacific through assimilating Argo data into initial fields

Hongli Fu, Peter C. Chu, Guijun Han, Zhongjie He, more

Acta Oceanologica Sinica > 2013 > 32 > 7 > 57-65

The impact of assimilating Argo data into an initial field on the short-term forecasting accuracy of temperature and salinity is quantitatively estimated by using a forecasting system of the western North Pacific, on the base of the Princeton ocean model with a generalized coordinate system (POMgcs). This system uses a sequential multigrid three-dimensional variational (3DVAR) analysis scheme to assimilate...

article

A global ocean reanalysis product in the China Ocean Reanalysis (CORA) project

Guijun Han, Hongli Fu, Xuefeng Zhang, Wei Li, more

Advances in Atmospheric Sciences > 2013 > 30 > 6 > 1621-1631

The first version of a global ocean reanalysis over multiple decades (1979–2008) has been completed by the National Marine Data and Information Service within the China Ocean Reanalysis (CORA) project. The global ocean model employed is based upon the ocean general circulation model of the Massachusetts Institute of Technology. A sequential data assimilation scheme within the framework of 3D variational...

article

A theoretical study of the multigrid three-dimensional variational data assimilation scheme using a simple bilinear interpolation algorithm

Wei Li, Yuanfu Xie, Guijun Han

Acta Oceanologica Sinica > 2013 > 32 > 3 > 80-87

In order to solve the so-called “bull-eye” problem caused by using a simple bilinear interpolation as an observational mapping operator in the cost function in the multigrid three-dimensional variational (3DVAR) data assimilation scheme, a smoothing term, equivalent to a penalty term, is introduced into the cost function to serve as a means of troubleshooting. A theoretical analysis is first performed...

article

A new version of regional ocean reanalysis for coastal waters of China and adjacent seas

Guijun Han, Wei Li, Xuefeng Zhang, Xidong Wang, more

Advances in Atmospheric Sciences > 2013 > 30 > 4 > 974-982

A new regional ocean reanalysis over multiple decades (1958–2008) for the coastal waters of China and adjacent seas has been completed by the National Marine Data and Information Service (NMDIS) under the CORA (China Ocean ReAnalysis) project. Evaluations were performed on three aspects: (1) the improvement of general reanalysis quality; (2) eddy structures; and (3) decadal variability of sea surface...

article

An ensemble estimation of impact times and strength of Fukushima nuclear pollution to the east coast of China and the west coast of America

GuiJun Han, Wei Li, HongLi Fu, XueFeng Zhang, more

Science China Earth Sciences > 2013 > 56 > 8 > 1447-1451

Based on the statistics of all surface drifting buoys of 1978–2011 and Lagrangian tracers simulated from high quality ocean reanalysis currents, the impact times and strength of Fukushima nuclear pollution to the east coast of China and the west coast of America have been estimated. Under the circumstances of the radioactive pollutants drifting in the ocean surface, preliminary research results show...

chapter

Investigation of Transport Paths and Times of Fukushima Nuclear Pollutants in the North Pacific Surface Using Surface Drifting Buoys

Hongli Fu, Guijun Han, Wei Li, Xuefeng Zhang

2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering > 1 - 3

2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE)

Based on the statistics of all surface drifting buoys of 1979-2011, the transport paths and times of Fukushima nuclear pollutants in the North Pacific surface have been studied. We examined the trajectories of surface drifting buoys that passed by the pre-defined source region of nuclear pollutants (totally 176 buoys) one by one to identify typical buoy trajectories in the North Pacific surface. Results...

article

Heat, salt and volume transports by eddies in the vicinity of the Luzon Strait

Xidong Wang, Wei Li, Yiquan Qi, Guijun Han

Deep-Sea Research Part I > 2012 > 61 > Complete > 21-33

The heat, salt and volume transports by oceanic meso-scale eddies generated near the Luzon Strait and moving into the South China Sea (SCS) are estimated by combining satellite altimetry and sea surface temperature (SST) data with hydrographic data. By establishing a statistical relationship among steric height, SST and subsurface temperature, together with a multi-grid 3D-Var assimilation method,...

article

Summer surface layer thermal response to surface gravity waves in the Yellow Sea

Xuefeng Zhang, Guijun Han, Dongxiao Wang, Zengan Deng, more

Ocean Dynamics > 2012 > 62 > 7 > 983-1000

The Princeton Ocean Model (POM) with generalized coordinate system (POMgcs) is used to study the summer surface-layer thermal response to surface gravity waves in the Yellow Sea (YS). The parameterization schemes of wave breaking developed by Mellor and Blumberg (J Phys Oceanogr 34:693–698, 2004) and Kantha and Clayson (Ocean Model 6:101–124, 2004), respectively, and Stokes production developed by...

article

The effect of Coriolis-Stokes forcing on upper ocean circulation in a two-way coupled wave-current model

Zeng’an Deng, Li’an Xie, Guijun Han, Xuefeng Zhang, more

Chinese Journal of Oceanology and Limnology > 2012 > 30 > 2 > 321-335

We investigated the Stokes drift-driven ocean currents and Stokes drift-induced wind energy input into the upper ocean using a two-way coupled wave-current modeling system that consists of the Princeton Ocean Model generalized coordinate system (POMgcs), Simulating WAves Nearshore (SWAN) wave model, and the Model Coupling Toolkit (MCT). The Coriolis-Stokes forcing (CSF) computed using the wave parameters...

article

Impact of barrier layer on typhoon-induced sea surface cooling

XiDong Wang, GuiJun Han, YiQuan Qi, Wei Li

Dynamics of Atmospheres and Oceans > 2011 > 52 > 3 > 367-385

Both Argo measurements and satellite sea surface temperature (SST) data revealed that there was less-than-usual surface cooling during the passage of typhoons Kaemi and Cimaron in the tropical Northwest Pacific. In the present study, it is found that SST cooling induced by typhoon can be greatly suppressed by a barrier layer with a thickness of 5–15m. Such a barrier layer could reduce the entrainment...

chapter

A Three-Dimensional Variational Analysis Using Sequential Filter

Xinrong Wu, Guijun Han, Dong Li, Wei Li

2011 Fourth International Joint Conference on Computational Sciences and Optimization > 1016 - 1020

2011 Fourth International Joint Conference on Computational Sciences and Optimization (CSO)

A three-dimensional variational (3D-Var) data assimilation (DA) scheme which introduces sequential filter is designed to improve state estimation from observations. The sequential filter employed in this new hybrid scheme, operating on the background field instead of on the observation field as usual, is under the framework of ensemble adjustment Kalman filter (EAKF). Under perfect global barotropic...

INFONA - science communication portal

Search results for: GuiJun Han

Conflict Analysis of Multi-source SST Distribution

Correction of biased climate simulated by biased physics through parameter estimation in an intermediate coupled model

A study of the impact of parameter optimization on ENSO predictability with an intermediate coupled model

Impact of sea spray on upper ocean temperature during typhoon passage: simulation with a 1-D turbulent model

Effects of Stokes production on summer ocean shelf dynamics

A numerical estimation of the impact of Stokes drift on upper ocean temperature

A study of transport and impact strength of Fukushima nuclear pollutants in the north pacific surface

Effects of tropical cyclones on large-scale circulation and ocean heat transport in the South China Sea

Salinity drift of global Argo profiles and recent halosteric sea level variation

Improvement of short-term forecasting in the northwest Pacific through assimilating Argo data into initial fields

A global ocean reanalysis product in the China Ocean Reanalysis (CORA) project

A theoretical study of the multigrid three-dimensional variational data assimilation scheme using a simple bilinear interpolation algorithm

A new version of regional ocean reanalysis for coastal waters of China and adjacent seas

An ensemble estimation of impact times and strength of Fukushima nuclear pollution to the east coast of China and the west coast of America

Investigation of Transport Paths and Times of Fukushima Nuclear Pollutants in the North Pacific Surface Using Surface Drifting Buoys

Heat, salt and volume transports by eddies in the vicinity of the Luzon Strait

Summer surface layer thermal response to surface gravity waves in the Yellow Sea

The effect of Coriolis-Stokes forcing on upper ocean circulation in a two-way coupled wave-current model

Impact of barrier layer on typhoon-induced sea surface cooling

A Three-Dimensional Variational Analysis Using Sequential Filter

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