Shenshen Li

Shenshen Li
Chinese Academy of Sciences | CAS · Institute of Remote Sensing and Digital Earth

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79
Publications
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Publications

Publications (79)
Article
Full-text available
Global warming is currently an area of concern. Human activities are the leading cause of urban greenhouse gas intensification. Inversing the spatial distribution of carbon emissions at microscopic scales such as communities or controlling detailed planning plots can capture the critical emission areas of carbon emissions, thus providing scientific...
Preprint
Global warming is currently an area of concern. Human activities are the leading cause of urban greenhouse gas intensification. Inversing the spatial distribution of carbon emissions at microscopic scales such as communities or controlling detailed planning plots can capture the critical emission areas of carbon emissions, thus providing scientific...
Article
Full-text available
The water use efficiency (WUE) is an essential indicator of carbon–water coupling between terrestrial ecosystems and the atmosphere, and it is an important parameter for studying ecosystem responses to global climate change. A comprehensive understanding of the water–carbon coupling process in the Loess Plateau can reflect the balance between the “...
Article
Full-text available
The Grain for Green Project (GGP) has considerably improved the vegetation cover of the Loess Plateau, as well as changed the carbon and water coupling process of local vegetation to a certain extent. Water use efficiency (WUE) is a crucial measure for evaluating ecosystem responses to global climate change and is a key indicator of the carbon–wate...
Article
Full-text available
Air pollution is the result of comprehensive evolution of a dynamic and complex system composed of emission sources, topography, meteorology and other environmental factors. The establishment of spatiotemporal evolution model is of great significance for the study of air pollution mechanism, trend prediction, identification of pollution sources and...
Preprint
Full-text available
Air pollution is the result of comprehensive evolution of a dynamic and complex system composed of emission sources, topography, meteorology and other environmental factors. The establishment of spatiotemporal evolution model is of great significance for the study of air pollution mechanism, trend prediction, identification of pollution sources and...
Article
Himawari-8, a new generation geostationary satellite, with the Advanced Himawari Imager (AHI) providing Full Disk observation with high temporal resolution (10 min) exhibits prominent advantage in monitoring aerosols over East Asia region. The AHI has 16 channels from 0.46 to 13.3 to capture visible and infrared spectral data. In this paper, we dev...
Article
Himawari-8, a new generation geostationary satellite, carries the Advanced Himawari Imager (AHI), which can provide high temporal resolution observations (10 min) in monitoring the distribution and variation of aerosol over large areas. Recently, the AHI aerosol algorithm was refined, and the updated AHI version 2.0 Level 2 aerosol products were re...
Article
In this analysis, the Aqua/MODIS aerosol optical thickness (AOD), Aura/OMI tropospheric NO2 and SO2 column concentration from 2006 to 2015 were used to statistically analyze the spatial distribution characteristics and variation trends of three polluted parameters from three temporal scales of monthly, seasonal and annual average. The results showe...
Article
In a moist atmosphere, the ageing process of aerosol can make the agglomerated soot particles compact, and cause them to be covered by a water coating. Based on the cluster‒cluster aggregation (CCA) algorithm, the models of chain-like soot with water coatings (Models A to E) were generated in this study. The superposition T-matrix method was employ...
Article
Full-text available
It has been found that the concentration of atmospheric methane (CH4) has rapidly increased since 2007 after a decade of nearly constant concentration in the atmosphere. As an important greenhouse gas, such an increase could enhance the threat of global warming. To better quantify this increasing trend, a novel statistic method, i.e. the Ensemble E...
Article
China is the largest anthropogenic aerosol-generating country worldwide; however, few studies have analyzed the PM 2.5 chemical components and their underlying precursor emissions over long periods and across the national domain. First, global 3-D tropospheric chemistry and transport model (GEOS-Chem)-integrated satellite-retrieved aerosol optical...
Article
Previous studies exploring the impact of precursor emissions and meteorological variables on PM2.5 concentrations were typically conducted over a short period and in urban environments. In this analysis, near-surface sulfate and nitrate mass concentrations at a 10-km resolution over the North China Plain (NCP) from 2006 to 2014 were first obtained...
Article
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Few studies have specifically focused on the validation and spatiotemporal distribution of planetary boundary layer height (PBLH) and relative humidity (RH) data in China. In this analysis, continuous PBLH and surface-level RH data simulated from GEOS-5 between 2004 and 2012, were validated against ground-based observations. Overall, the simulated...
Article
Full-text available
Analysis of cloud cover and its diurnal variation over the Tibetan Plateau (TP) is highly reliant on satellite data; however, the accuracy of cloud detection from both polar-orbiting and geostationary satellites over this area remains unclear. The new-generation geostationary Himawari-8 satellites provide high- resolution spatial and temporal infor...
Article
This article is intentionally published to make erratum to the print version and the online version of Vol.60 (2017) NO. 2 (https://link.springer.com/article/10.1007/s11430-015-0247-9). Citations of the following publications should be added to the list of Reference for TCCON data use: Wennberg P O, Roehl C M, Wunch D, Toon G C, Blavier J F, Washen...
Article
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People in central-eastern China are suffering from severe air pollution of nitrogen oxides. Top-down approaches have been widely applied to estimate the ground concentrations of NO2 based on satellite data. In this paper, a one-year dataset of tropospheric NO2 columns from the Ozone Monitoring Instrument (OMI) together with ambient monitoring stati...
Article
Full-text available
Epidemiologic and health impact studies have examined the chemical composition of ambient PM2.5 in China but have been constrained by the paucity of long-term ground measurements. Using the GEOS-Chem chemical transport model and satellite-derived PM2.5 data, sulfate and ammonium levels were estimated over China from 2004 to 2014. A comparison of th...
Article
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Mapping the components, size, and absorbing/scattering properties of particle pollution is of great interest in the environmental and public health fields. Although the Multi-angle Imaging SpectroRadiometer (MISR) can detect a greater number of aerosol microphysical properties than most other spaceborne sensors, the Angstrom exponent (AE) and singl...
Article
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In the past decades, continuous efforts have been made at a national level to reduce Nitrogen Dioxide (NO 2) emissions in the atmosphere over China. However, public concern and related research mostly deal with tropospheric NO 2 columns rather than ground-level NO 2 concentrations, but actually ground-level NO 2 concentrations are more closely rela...
Article
Full-text available
Aerosol optical depth (AOD) has been widely used in climate research, atmospheric environmental observations, and other applications. However, high AOD retrieval remains challenging over heavily polluted regions, such as the North China Plain (NCP). The Visible Infrared Imaging Radiometer Suite (VIIRS), which was designed as a successor to the Mode...
Article
Full-text available
Cloud detection by passive satellite sensors is very challenging in hazy weather over China because the reflective characteristics of haze and clouds are very similar. Consequently, hazy areas tend to be mistaken as cloudy or clear areas by current cloud mask algorithms. The Advanced Himawari Imager (AHI) aboard Himawari-8 is a multispectral Earth...
Article
Model-simulated aerosol profiles can significantly improve a satellite’s capability to estimate ground-level particle concentrations, but are difficult to validate due to the sparse network of ground-based lidars. We quantitatively evaluated aerosol vertical profiles simulated by the Global 3-D Atmospheric Chemical Transport model (GEOS-Chem) and t...
Article
We propose an algorithm that combines a pre-processing step applied to the a priori state vector prior to retrievals, with the modified damped Newton method (MDNM), to improve convergence. The initial constraint vector pre-processing step updates the initial state vector prior to the retrievals if the algorithm detects that the initial state vector...
Article
China's large aerosol emissions have major impacts on global climate change as well as regional air pollution and its associated disease burdens. A detailed understanding of the spatiotemporal patterns of aerosol components is necessary for the calculation of aerosol radiative forcing and the development of effective emission control policy. Model-...
Article
This paper employed ground-based measurements, multiple satellite observations, NCEP reanalysis data, meteorological sounding data and Modeled HYSPLIT4backward trajectory results to analyse the pollution characteristics and forming process of haze pollution in Zhongmou, a rural site located in the central North China Plain. The Comprehensive observ...
Article
Beginning in early January 2013, Beijing experienced multiple prolonged and severe smog events that were characterized by very high levels of PM 2.5 , with peak daily PM 2.5 over 400 µg m –3. With PM 2.5 concentration contours created from ground observations and satellite remote sensing data, we describe the spatial and temporal characteristics of...
Article
Full-text available
Persistent high aerosol loadings together with extremely high population densities have raised serious air quality and public health concerns in many urban centers in East Asia. However, ground-based air quality monitoring is relatively limited in this area. Recently, satellite-retrieved Aerosol Optical Depth (AOD) at high resolution has become a p...
Article
Full-text available
The principles of cloud droplet size retrieval via Polarization and Directionality of the Earth's Reflectance (POLDER) requires that clouds be horizontally homogeneous. The retrieval is performed by combining all measurements from an area of 150 km × 150 km to compensate for POLDER's insufficient directional sampling. Using POLDER-like data simulat...
Article
Full-text available
Persistent high aerosol loadings together with extremely high population density have raised serious air quality and public health concerns in many urban centers in East Asia. However, ground based air quality monitoring is relatively limited in this area. Recently, satellite retrieved Aerosol Optical Depth (AOD) at high resolution has become a pow...
Article
Full-text available
The principles of the Polarization and Directionality of the Earth's Reflectance (POLDER) cloud droplet size retrieval requires that clouds are horizontally homogeneous. Nevertheless, the retrieval is applied by combining all measurements from an area of 150 km × 150 km to compensate for POLDER's insufficient directional sampling. Using the POLDER-...
Article
Biomass burning makes up an important part of both trace gases and particulate matter emissions, which can efficiently degrade air quality and reduce visibility, destabilize the global climate system at regional to global scales. Burned area is one of the primary parameters necessary to estimate emissions, and considered to be the largest source of...
Article
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The Multi-angle Imaging SpectroRadiometer (MISR) aboard the NASA Earth Observing System's Terra satellite can provide more reliable aerosol optical depth (AOD) and better constraints on particle size (Ångström exponent, or ANG), sphericity, and single-scattering albedo (SSA) than many other satellite instruments. However, many aerosol mixtures pass...
Article
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Fossil-fuel combustion related winter heating has become a major air quality and public health concern in northern China recently. We analyzed the impact of winter heating on aerosol loadings over China using the MODIS-Aqua Collection 6 aerosol product from 2004-2012. Absolute humidity (AH) and planetary boundary layer height (PBL) -adjusted aeroso...
Conference Paper
An algorithm to retrieve the Haze Aerosol Optical Depth (AOD) is developed to supplement the current MODIS and VIIRS retrieval algorithm.
Conference Paper
The optical parameters of two typical soot-water mixtures were investigated using the superposition T-matrix method, with a focus on the impact of the morphology and water coating of soot aggregates.
Conference Paper
Observations in Band 2 and Band 4 are simultaneously used to retrieve CO2 concentration based on Optimal Estimate (OE) method. Retrieved XCO2 over China will be presented.
Conference Paper
We performed a sensitivity study with the radiative transfer model LIDORT to better understand the impact of high aerosol loading on the calculation of NO2 AMFs, which is ignored in the current algorithm of NO2 satellite retrieval.
Article
Full-text available
The Multi-Angle Imaging Spectro-Radiometer (MISR) instrument on NASA's Terra satellite can provide more reliable Aerosol Optical Depth (AOD, τ) and more particle information, such as constraints on particle size (Angström exponent or ANG, α), particle shape, and single-scattering albedo (SSA, ω), than many other satellite instruments. However, MISR...
Article
Full-text available
To effectively estimate the influence of multiple scattering caused by haze particles on the misestimating of CO2 concentrations, it is necessary to understand the scattering properties of haze particles in the shortwave infrared (SWIR) wavelength range (~1.6um) using satellite data. Due to the complexity of structures and components of haze partic...
Article
Aerosol optical properties simulated by the global 3‐D tropospheric chemistry and transport model Goddard Earth Observing System (GEOS)‐Chem (GC) from 2008 to 2010 over the contiguous United States were evaluated with ground observations from Aerosol Robotic Network (AERONET) sites and aerosol products reported by the Multiangle Imaging Spectroradi...
Article
China's industrialized regions have seen increasing occurrence of heavy haze caused by severe particle pollution. However, aerosol retrieval under these circumstances is often excluded from NASA's Moderate Resolution Imaging Spectrometer (MODIS) aerosol products due to cloud mask and suspected high surface reflectance. An algorithm to retrieve the...
Article
Based on the T-matrix method and the generalized multiparticle Mie-solution (GMM) method combined with diffusion-limited aggregation simulator, the scattering properties of non-spherical particles and aggregates are simulated at 1.6 μm and 2.0 μm. And the effects of the equal-volume sphere radius, the complex refractive index, the particle shape an...
Article
Integrating multi-angle, multi-spectral, and polarized measurements can improve the accuracy of retrieved aerosol microphysical properties, such as aerosol size distribution and complex refractive index. Using polarized measurements assisted by intensity measurements, a new algorithm to retrieve aerosol size distribution is developed. Constrained b...
Article
Full-text available
Two factors that affect satellite retrieval of Aerosol Optical Depth (AOD) are aerosol model assumptions and the separation of surface reflectance. NASA/MODIS Dense Dark Vegetation (DDV) algorithm has been proven valuable in deriving aerosol distribution and properties over land; however, it cannot be applied to bright targets. As a supplement to t...
Conference Paper
There are four CCD cameras with spatial resolution of 30 m in Environment Satellite 1 (HJ-1), the new satellite developed by China. In the paper, deep blue algorithm for CCD/HJ-1 is applied to Ning-bo. Based on the database of surface reflectance from MODerate-resolution Imaging Spectroradiometer (MODIS) spectral reflectance product and look-up tab...
Conference Paper
In China, haze days is occurring more and more frequently. By remote sensing, haze area can be monitored quickly over large region. In this paper, from level 1B data of Moderate Resolution Imaging Spectrometer (MODIS) and meteorologic data, the haze distribution is monitored by the threshold of apparent reflectance and brightness temperature in eig...
Article
MODIS V4 fire detection algorithm has problems of fire omissions at large scan geometries. In order to solve this problem, the brightness temperature changes of fire pixels, which consist of fire and background surface at different scan geometries, were analyzed. Active potential fire detecting thresholds were developed according to scan geometries...
Article
A statistical model was developed using satellite remote sensing data and meteorological parameters to evaluate the effectiveness of air pollution control measures during the 2008 Beijing Olympic Games. Custom satellite retrievals under hazy conditions were included in the modeling dataset to represent the air pollution levels more accurately. This...
Article
Full-text available
With the urbanizing in China, haze days occur frequently, which have largely impacted air quality. In the present paper, based on haze physical properties, haze optical properties were calculated by Mie theory and apparent reflectance of haze in Environment Satellite 1 (HJ-1) channels was simulated by Radiative Transfer (RT) 3. Simulated results sh...
Article
Frequent occurring of heavy haze in China's industrialized regions has received increasing attention as an air pollution concern. However, aerosol retrieval under these circumstances is often excluded from NASA's Moderate Resolution Imaging Spectrometer (MODIS) aerosol products due to concerns of cloud contamination. An algorithm to retrieve the Ha...
Article
Full-text available
Generally, aerosols over land are composed of fine and coarse aerosols, which have different optical properties. How to derive the fine mode and coarse mode aerosols from satellite observations is an important issue in the aerosol retrieving. In the present paper, information of aerosol models (including refractive index and size distribution funct...
Article
The Ring effect refers to the filling in of Fraunhofer lines, which is mainly attributed to the rotational Raman scattering of solar spectra by N2 and O2 molecules in the atmosphere. The Ring effect is one of the most significant factors affecting the accuracy of retrieving concentrations of atmospheric trace gases, such as NO2 and SO2, from satell...
Article
Dense Dark Vegetation algorithm (DDV) is effectively used in retrieval of aerosol optical depth (AOD) from satellite images over land. However, the algorithm is only suitable for low albedo areas such as water and dense vegetation areas. The purpose of this paper is mainly to retrieve aerosol optical depth over none DDV pixels by using the kriging...
Article
Full-text available
The potentiality of the retrieval of surface reflectance using CCD camera aboard HJ-1A/B satellite was studied. It is very difficult to use dark targets in atmospheric correction due to the lack of near infrared band. The alternative normalized difference vegetation index (NDVI) and the red/blue reflectance ratio are detected from the spectral expe...
Article
The Ring effect is a significant limitation to the accuracy of the retrieval of trace gas constituents in atmosphere, while using satellite data with differential optical absorption spectroscopy technique. The Ring effect refers to the filling in of Fraunhofer lines, known as solar absorption lines, caused almost entirely by rotational Raman scatte...
Conference Paper
In this paper, we explored the changes of air quality over Jing-Jin-Tang (Beijing-Tianjin-Tangshan) district during the period from 2002 to 2009. Based on Moderate Resolution Imaging Spectroradiometer (MODIS) data, Dense Dark Vegetation (DDV) algorithm is employed to retrieve the aerosol optical thickness (AOT) with 1-km resolution. Comparison of t...
Conference Paper
The Ring effect refers to the filling in of Fraunhofer lines, which is known as solar absorption lines, caused almost entirely by Rotational Raman scattering. The Rotational Raman scattering by N2 and O2 in the atmosphere is the main factor that leads to Ring effect. Basically, the Ring effect is considered as a pseudo-absorption process in retriev...
Article
Inelastic Vibrational Raman Scattering (VRS) by liquid water is one significant limitation to the accuracy of the retrieval of trace gas constituents in atmosphere over waters, particularly over clear ocean waters, while using satellite data with Differential Optical Absorption Spec-troscopy technique (DOAS).The effect which is similar to the Ring...
Article
It is very importance to monitor fog for its impact on traffic and human health. With the development of remote sensing (RS) and geographical information system (GIS) technologies, the monitoring of fog can be easily and quickly. In this paper, a fog monitoring system based on RS and GIS was built up. Firstly, by the thresholds in different bands,...
Article
To insure air quality during the Beijing Olympic Games, open field burning of crop residues was banned in North China from May to September in 2008. The impact of this effort was estimated through the detection of the crop residue burning from MODIS data and measurement of NO2 vertical column density retrieved from OMI data. The middle and thermal...
Article
Full-text available
The potentiality of the retrieval of aerosol optic depth over land using CCD camera aboard on HJ-1A/B satellite was studied. It is very difficult to use CCD data to retrieve aerosol optic depth due to the lack of near infrared band. By using the normalized difference vegetation index (NDVI) to search for the dark pixel, a modified dark dense vegeta...
Conference Paper
On the eve of Beijing Olympic Games (BOG), frequent haze days had been extensively concerned by home and abroad. Ground-based and satellite remote sensing project was carried out to monitor haze distribution and intension by Chinese Academy of Sciences. Based on the assumption that surface reflectance vary slowly in a relative short period, the Haz...
Conference Paper
PM10 (Particle Matter 10) is the major air pollutants. In this paper, the monitoring of PM10 from MODIS (Moderate Resolution Imaging Spectroradiometer) data was applied at Pearl River Delta, China. The method was as follow: 1) By DDV (dark dense vegetation) algorithm, the AOD (aerosol optical depth) was retrieved; 2) The PM10 was worked out from AO...
Conference Paper
Full-text available
During Beijing Olympic Games, air quality had been extensively concerned by home and abroad. Remote Sensing satellite can provide greater monitoring scale compared to ground equipment. Based on NASA MODerate resolution Imaging Spectrometer (MODIS) data, using .NET multi-layer architecture, combined with MatlabCOM, ArcEngine and other components, we...
Conference Paper
Nitrogen dioxide (NO2) plays a very important role among the anthropogenic trace gases. The tropospheric NO2 vertical column density (VCD) maps derived have been used to study many scientific applications, pollution emissions and pollutant distribution. During the 2008 Summer Olympic Games in Beijing, NO2 is one main air pollutant which should be m...
Conference Paper
Full-text available
In this paper, the retrieval of aerosol over land surfaces from CCD data of China Brazil Earth Resources Satellite (CBERS) 02B was studied. The method is dark dense vegetation (DDV) algorithm: 1) dense vegetation (dark pixel) was recognized by the NDVI threshold; 2) the look up table (LUT) of atmosphere was computed from the Satellite Signal in the...
Conference Paper
Full-text available
Operational global quantitative retrievals of aerosol have been made from Moderate Resolution Imaging Spectrometer (MODIS) data for several years by NASA EOS teams. Dark Dense Vegetation (DDV) algorithm has shown excellent competence at aerosol distribution and properties over land. In Sep. 2008, China successfully launched environmental satellite...