Prof. Daren Lu Profile

Prof. Daren Lu

at Institute of Atmospheric Physics

SPIE Involvement:

Author

Proceedings Article | 12 May 2005 Paper

Mesoscale characteristics of dust storms and mineral dust aerosol's spectral optical depth over Northern China

Daren Lu, Wenxing Zhang, Hongzhou Li

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619646

KEYWORDS: Aerosols, Minerals, Visibility, Ocean optics, Atmospheric particles, Climatology, Lutetium, Environmental sensing, Atmospheric optics, Lithium

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Proceedings Article | 12 May 2005 Paper

Land surface temperature database in clear days retrieved by using GMS 5 satellite observation: preliminary investigation

Minyan Wang, Daren Lu

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619669

KEYWORDS: Satellites, Databases, Temperature metrology, Remote sensing, Earth observing sensors, Meteorology, Algorithm development, Clouds, Environmental sensing, Climatology

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Proceedings Article | 12 May 2005 Paper

The sensitivity analysis of microwave radiometer's brightness temperature and geophysical parameters

Qiang Sun, Daren Lu

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619873

KEYWORDS: Microwave radiation, Clouds, Liquids, Radiometry, Atmospheric modeling, Meteorological satellites, Atmospheric physics, Imaging systems, Atmospheric optics, Error analysis

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Proceedings Article | 12 May 2005 Paper

Retrieval of water vapor and temperature profiles from radio occultation measurements by combination of ANN and iterative method

Xin Wang, Daren Lu

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619758

KEYWORDS: Water, Iterative methods, Ions, Temperature metrology, Troposphere, Earth's atmosphere, Artificial neural networks, Global Positioning System, Neurons, Atmospheric optics

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Proceedings Article | 12 May 2005 Paper

Satellite measurements of air density and ozone concentration profiles in the mesosphere using an ultraviolet limb-scan technique

Xia Guo, Daren Lu, Yao Lu, Xiujun Zhang

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619647

KEYWORDS: Ozone, Ultraviolet radiation, Satellites, Mesosphere, Rayleigh scattering, Scattering, Atmospheric optics, Absorption, Atmospheric monitoring, Atmospheric sensing

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Proceedings Article | 12 May 2005 Paper

Analysis of cloud distribution in Beijing with all-sky images

Juan Huo, Daren Lu

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619658

KEYWORDS: Clouds, Imaging systems, Statistical analysis, Image analysis, Atmospheric optics, Solids, Lutetium, Numerical simulations, Computer simulations, Environmental sensing

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Proceedings Article | 12 May 2005 Paper

Intercomparison of rainfall rate retrieval results by SSM/I over west Pacific Ocean

Jinli Liu, Ling Zhang, Daren Lu, Haibin Sun

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619871

KEYWORDS: Meteorology, Medium wave, Radiometry, Remote sensing, Clouds, Scattering, Satellites, Error analysis, Algorithm development, Composites

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Proceedings Article | 12 May 2005 Paper

Feasibility study of cloud base height remote sensing by ground-based sky thermal infrared brightness temperature measurements

Wenxing Zhang, Daren Lu, Youli Chang

Proceedings Volume 5832, (2005) https://doi.org/10.1117/12.619663

KEYWORDS: Clouds, Infrared radiation, Aerosols, Atmospheric modeling, Visibility, Remote sensing, Thermography, Temperature metrology, Infrared sensors, Infrared imaging

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Infrared remote sensing of clouds is one of the main subjects in the field of atmospheric remote sensing from satellites. As its characteristics of intense infrared radiation and absorption the heights of cloud top can generally be derived from the brightness temperature obtained from satellite infrared cloud images and then a series of study about cloud morphologic microphysics and dynamics can be conducted. On the same principle the heights of cloud base can also be determined by sky infrared brightness temperature observations on the ground. Some preliminary studies were made in the past but have not been extended. The reason is that the range of zenith angle is very wide for ground-based remote sensing of cloud base heights. From near horizontal ground up to zenith at different zenith angle the background infrared brightness temperature of clear sky atmosphere is very different it is the function of the atmospheric temperature and humidity profiles as well as the zenith angle. Hence the question must be considered is how to obtain the correct information about the heights of cloud base from sky background brightness temperatures in large variational range. In addition the contributions of aerosols in near ground atmosphere to sky brightness temperatures observed on the ground cannot be neglected. In order to correctly derive cloud base heights from sky brightness temperatures the effect of aerosol layer must be studied seriously. Using radiative transfer equation to study th sensitivities of thermal infrared brightness temperature values observed on the ground to different aerosols and different cloud base heights is an important basic work. In this paper systematic study on the variations of sky infrared brightness temperatures caused by different kinds of clouds under the different kinds of the different intensities (represented by different ground visibilities) of aerosols using MODTRAN 4.0 model is presented. In this study the feasibility of cloud base height remote sensing by ground-based sky infrared brightness temperature observation and the quantitative effects of aerosol layer on it can be found. From the calculated results by model the following can be concluded: 1. For low and middle clouds, the sky thermal infrared brightness temperature observed on the ground is very sensitive to the variations of cloud base height, therefore as the "clear" sky brightness temperature is known it can be used to retrieve and remote sensing of cloud base height. 2. The influence of aerosols (visibilities and aerosol types) above the ground on the sky background brightness temperatures is considerable, it must be corrected. Because the aerosol's influence on brightness temperatures with different zenith angles is fairly clear, it can be corrected very well.

Proceedings Article | 14 July 2003 Paper

Monitoring vegetation cover change in east Hunshandake savanna with Landsat TM

Qing He, Daren Lu

Proceedings Volume 4890, (2003) https://doi.org/10.1117/12.466816

KEYWORDS: Vegetation, Climatology, Landsat, Remote sensing, Ecosystems, Clouds, Lutetium, Soil science, Reflectivity, Earth observing sensors

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Proceedings Article | 1 July 2003 Paper

Feasibility study for joint retrieval of ozone and air density profiles in the mesosphere and upper stratosphere using an ultraviolet limb-scan technique

Xia Guo, Daren Lu

Proceedings Volume 4896, (2003) https://doi.org/10.1117/12.466209

KEYWORDS: Ozone, Ultraviolet radiation, Mesosphere, Satellites, Stratosphere, Error analysis, Earth observing sensors, Direct methods, Numerical simulations, Lithium

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Proceedings Article | 30 April 2003 Paper

Method of microwave remote sensing of rainfall distribution over tropical ocean

Jinli Liu, Longfu Lin, Ling Zhang, Daren Lu

Proceedings Volume 4894, (2003) https://doi.org/10.1117/12.467776

KEYWORDS: Clouds, 3D modeling, Radiative transfer, Atmospheric modeling, Data modeling, Terbium, Microwave remote sensing, Microwave radiation, Computer simulations, Remote sensing

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Proceedings Article | 30 April 2003 Paper

Small-scale nonuniform rain beam filling errors in spaceborne radar rain measurement

Ling Zhang, Jinli Liu, Shu Duan, Daren Lu

Proceedings Volume 4894, (2003) https://doi.org/10.1117/12.467742

KEYWORDS: Radar, Reflectivity, Error analysis, Signal attenuation, Environmental sensing, Computer simulations, Data modeling, X band, Spatial resolution, Smoothing

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Proceedings Article | 9 April 2003 Paper

Measurement and analysis of atmospheric aerosol optical thickness and Angstrom exponent during 1998-2000 in the Beijing area

Wenxing Zhang, Daren Lu, Pucai Wang

Proceedings Volume 4891, (2003) https://doi.org/10.1117/12.467539

KEYWORDS: Aerosols, Atmospheric optics, Atmospheric particles, Radiometry, Atmospheric physics, Radio optics, Calibration, Environmental management, Charge-coupled devices, Spectroscopy

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Proceedings Article | 9 April 2003 Paper

Ground-based remote sensing of vertical distribution of aerosols with sky radiance measurements: numerical simulation

Daren Lu, Wenxing Zhang

Proceedings Volume 4891, (2003) https://doi.org/10.1117/12.467559

KEYWORDS: Aerosols, Atmospheric particles, Scattering, Atmospheric modeling, Atmospheric optics, Remote sensing, Radiative transfer, Numerical simulations, Sun, Refractive index

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Proceedings Article | 21 February 2001 Paper

Atmospheric correction for high-resolution multiwavelength spectrometry based on radiative-transfer model computation

Daren Lu, Minzheng Duan

Proceedings Volume 4150, (2001) https://doi.org/10.1117/12.416966

KEYWORDS: Reflectivity, Atmospheric corrections, Atmospheric optics, Atmospheric particles, Atmospheric modeling, Remote sensing, Sensors, Atmospheric sensing, Aerosols, Scattering

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Proceedings Article | 19 August 1998 Paper

SOM-network-based algorithm for retrieving over-ocean precipitable water from the SSM/I measurements

Hongbin Chen, Jianchun Bian, Peicai Yang, Daren Lu

Proceedings Volume 3503, (1998) https://doi.org/10.1117/12.319474

KEYWORDS: Data modeling, Networks, Algorithm development, Terbium, Temperature metrology, Evolutionary algorithms, Statistical modeling, Microwave radiation, Sensors, Signal processing

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Proceedings Article | 19 August 1998 Paper

New methods for retrieval of rainfall rate over ocean with SSM/I data

Daren Lu, Haibing Sun, Jianchun Bian, Hongbin Chen, Jinli Liu, Minzheng Duan, Zhigang Han

Proceedings Volume 3503, (1998) https://doi.org/10.1117/12.319455

KEYWORDS: Clouds, Data modeling, Algorithm development, Medium wave, Remote sensing, Data centers, Radiometry, Artificial neural networks, Terbium, Evolutionary algorithms

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