Han ge

Han ge
Wuhan University | WHU · school of remote sensing and information engneering

PhD

About

65
Publications
8,083
Reads
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641
Citations
Additional affiliations
December 2017 - May 2019
Wuhan University
Position
  • Professor (Associate)
August 2015 - present
international school of software
Position
  • Lecturer
June 2012 - June 2015
Wuhan University
Position
  • PhD Student

Publications

Publications (65)
Article
We propose a novel, to the best of our knowledge, active–passive collaborative retrieval method for measuring XCO 2 (APCRM-CO 2 ). This method simultaneously uses observations from spectrometers and integrated path differential absorption laser detection and ranging (IPDA LIDAR), thus making its products have both the coverage advantages of passive...
Article
Full-text available
The frequency and severity of drought are increasing in the context of global warming. Elucidating the responses of crop productivity to drought is essential for informing agricultural management and ensuring food security. Here we used satellite-derived solar-induced chlorophyll fluorescence (SIF) data and vegetation indices to evaluate the impact...
Preprint
For carbon dioxide concentration (XCO2) distribution, the improvement of spatial and temporal resolution is very important in some scientific studies (e.g., studies of the carbon cycle and assessment of carbon emissions based on top-down theory). However, carbon sniffing satellites based on passive theory (e.g., Gosat-2, OCO-2, and OCO-3) are susce...
Preprint
The quantification of CH4 emissions from coal mines has large uncertainty owing to the lack of effective monitoring methods. In this study, we developed a genetic algorithm–interior point penalty function (GA-IPPF) model to calculate the emission rate of large point sources of CH4 based on concentration sample. This model can provide optimized disp...
Article
Full-text available
Methane is the second most important greenhouse gas after carbon dioxide. The intensity and distribution of methane source/sink in China are unknown. We collected the column-averaged dry air mixing ratio of CH4 (abbreviated as XCH4 hereafter) from TROPOMI for the period from 2018 to 2021, to study spatial distribution and temporal change of atmosph...
Article
A novel framework was proposed to measure atmospheric concentration of δ13C using a multi-wavelength integrated path differential absorption (IPDA) LIDAR. The spectroscopy range of the multi-wavelength IPDA LIDAR is recommended as from 2264.5 to 2265.5 cm-1. Using the proposed retrieving method, the relative error of δ13C retrievals would be within...
Article
Full-text available
China will launch the Atmospheric Environment Monitoring Satellite, which is equipped with a CO2-IPDA LIDAR. It is of great significance to explore the feasibility and effectiveness of this novel technique and to identify potential differences among its CO2 concentration products and the passive remote sensing technique. In this work, we developed...
Article
Full-text available
In recent years, as China’s peaking carbon dioxide emissions and air pollution control projects have converged, scholars have begun to focus on the synergistic mechanisms of greenhouse gas and pollution gas reduction. In 2020, the unprecedented coronavirus pandemic, which led to severe nationwide blockade measures, unexpectedly provided a valuable...
Article
Point sources account for a majority of anthropogenic activity emissions for polluting gases and greenhouse gases. Traditionally, the bottom-up method relies on emission inventories to estimate point source emission, which suffers from inaccurate reports and poor timeliness. In this study, a novel method was proposed on the basis of the interior po...
Article
Full-text available
Oceans are widely regarded as major offsets for anthropogenic carbon emissions, leading to an evident lower measured atmospheric CO2 concentration than expected. It is thus of great significance to develop effective means to monitor CO2 fluxes over oceans globally. In this work, we utilized observations obtained by an airborne CO2-IPDA LIDAR to eva...
Article
Atmospheric detection lidar is a powerful tool to achieve accurate detection of various elements of the atmosphere. However, noise is an unavoidable factor in the lidar signal, and it affects the analysis of the detection results. In this study, a universal de-noising algorithm based on signal segmentation and reconstruction is proposed to enhance...
Article
Quantification of the distribution of the CO₂ dry-air mixing ratio (XCO₂) is crucial for understanding the carbon cycle. However, clouds and aerosols in the line of light create spectral interference with CO₂ signals. This interference can result in a low yield of XCO₂ retrievals, thus limiting the application of these valuable satellite data. In t...
Conference Paper
We present the observations of atmospheric carbon dioxide (CO 2 ) in Wuhan using the HELIOS-100, a new portable Fourier Transform Spectrometry (FTS) maded by ABB Inc. The retrieval method and observation results will be introduced.
Conference Paper
Methane is an important kind of greenhouse warming gases that influence the global climate change. The detailed diffusion of methane still remains highly uncertainty, therefore, it’s meaningful to develop effectively method to detect atmosphere methane. Different absorption LiDAR (DIAL) has ability that to acquire the methane profile concentration...
Article
Full-text available
For high-precision measurements of the CO2 column concentration in the atmosphere with airborne integrated path differential absorption (IPDA) Lidar, the exact distance of the Lidar beam to the scattering surface, that is, the length of the column, must be measured accurately. For the high-precision inversion of the column length, we propose a set...
Article
Full-text available
Integrated-path differential absorption (IPDA) LiDAR is a promising means of measuring the global distributions of the column weighted xCO2 (dry-air mixing ratio of CO2) with adequate accuracy and precision. Most IPDA LiDARs are incapable of discerning the vertical information of CO2 diffusion, which is of great significance for studies on the carb...
Article
Full-text available
Pan evapotranspiration (E) is an important physical parameter in agricultural water resources research. Many climatic factors affect E, and one of the essential challenges is to model or predict E utilizing limited climatic parameters. In this study, the performance of four different artificial neural network (ANN) algorithms i.e., multiple hidden...
Article
Full-text available
The vertically distributed aerosol optical properties are investigated over Pakistan utilizing the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 products from 2007 to 2014. For a better understanding of the spatiotemporal characteristics of vertical aerosol layers, the interannual and seasonal variations of nin...
Article
Full-text available
COVID-19 suddenly struck Wuhan at the end of 2019 and soon spread to the whole country and the rest of world in 2020. To mitigate the pandemic, China authority has taken unprecedentedly strict measures across the country. That provides a precious window to study how the air quality response to quick decline of anthropogenic emissions in terms of na...
Article
Anthropogenic carbon emissions increase the atmospheric concentration of carbon dioxide, resulting in global warming and climate change. To complement the existing carbon emission verification system, it is crucial to develop a novel measurement-based estimation method for determining the carbon emissions produced by strong point sources. This stud...
Article
Full-text available
The optical and physical characteristics of the aerosol vertical layers over Northeastern China (NEC) are investigated using the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 layer products from 2007 to 2014. To better examine the spatial and temporal variations in the characteristics of aerosols over NEC, the...
Article
Full-text available
The uncertainty of carbon fluxes of the terrestrial ecosystem is the highest among all flux components, calling for more accurate and efficient means to monitor land sinks. Gross primary productivity (GPP) is a key index to estimate the terrestrial ecosystem carbon flux, which describes the total amount of organic carbon fixed by green plants throu...
Article
Full-text available
Haze is an atmospheric phenomenon in which different types of particulates obscure the sky, and hence affect almost all human activities. Over a couple of recent decades, China has witnessed increasingly worse air quality as well as atmospheric haziness in its cities. There are various haze contributing factors including the rapid industrialization...
Article
Full-text available
Remotely sensed products are of great significance to estimating global gross primary production (GPP), which helps to provide insight into climate change and the carbon cycle. Nowadays, there are three types of emerging remotely sensed products that can be used to estimate GPP, namely, MODIS GPP (Moderate Resolution Imaging Spectroradiometer GPP,...
Article
Full-text available
Atmospheric aerosol is one of the major factors that cause environmental pollution. Light detection and ranging (LiDAR) is an effective remote sensing tool for aerosol observation. In order to provide a comprehensive understanding of the aerosol pollution from the physical perspective, this study investigated regional atmospheric aerosol pollution...
Article
Methane (CH 4 ) is the second most important anthropogenic greenhouse gas that contributes to global warming. The global warming potential of CH 4 is 72 times that of CO 2 per molecule. However, the uncertainties of the sinks and sources of CH 4 remain large. Unfortunately, range-resolved atmospheric CH 4 concentrations have been rarely observed, t...
Article
Planetary boundary layer height (PBLH) has important implications for human health, weather forecasting, ecology, and climate change. This study aims to investigate the characteristics of the PBLH above Wuhan, China. We propose a new procedure (wavelet covariance and the ideal curve-fitting algorithm) to reveal PBLHs based on the Cloud-Aerosol LIDA...
Article
Full-text available
Atmospheric CO2 plays an important role in controlling climate change and its effect on the carbon cycle. However, detailed information on the dynamics of CO2 vertical mixing remains lacking, which hinders the accurate understanding of certain key features of the carbon cycle. Differential absorption lidar (DIAL) is a promising technology for CO2 d...
Article
Full-text available
Since over 70% of carbon emissions are from urban areas, it is of great importance to develop an effective measurement technique that can accurately monitor atmospheric CO2 in global urban areas. Remote sensing could be an effective way to achieve this goal. However, due to high aerosol loading in urban areas, there are large, inadequately resolved...
Article
Full-text available
The increase of greenhouse gas is one of the most important factors leading to global climate change. Differential absorption lidar (DIAL) is considered to be the tool with the most potential to measure CO2 remotely. However, it is difficult to obtain accurate CO2 retrievals and determine carbon fluxes with the traditional dual-wavelength different...
Article
Full-text available
CO2 is one of the most important greenhouse gases. Its concentration and distribution in the atmosphere have always been important in studying the carbon cycle and the greenhouse effect. This study is the first to validate the XCO2 of satellite observations with total carbon column observing network (TCCON) data and to compare the global XCO2 distr...
Article
Full-text available
Active remote sensing of atmospheric XCO2 has several advantages over existing passive remote sensors, including global coverage, a smaller footprint, improved penetration of aerosols, and night observation capabilities. China is planning to launch a multi-functional atmospheric observation satellite equipped with a CO2-IPDA (integrated path differ...
Article
Full-text available
The vertical profile of atmospheric CO₂ is of great scientific significance in identifying carbon sinks and sources, and estimating CO₂ emissions or uptakes. Differential absorption Light Detection And Ranging (DIAL), has been widely accepted as the most promising technique to sense atmospheric CO₂. The classical method to retrieve measurements, ge...
Article
This work evaluated the performance of the orbiting carbon observatory 2 (OCO-2) in terms of global atmospheric CO $_{2}$ observations for 20 months (September 2014 to April 2016). Three versions of data on CO $_{2}$ are currently available, namely, version 7, version 7r, and Lite File Product (Lite_FP). For the first time, we evaluated X $_{\mathr...
Article
The current acquisition system of a lidar detects return signals in two modes (i.e., analog and photon counting); resulting in the lower (below 1500 m) and upper (higher than 1100 m) atmospheric parameters need analog and photon counting signal to retrieve, respectively. Hence, a lidar cannot obtain a continuous column of the concentrations of atmo...
Article
Full-text available
To obtain a better understanding of carbon cycle and accurate climate prediction models, highly accurate and temporal resolution observation of atmospheric CO2 is necessary. Differential absorption LIDAR (DIAL) remote sensing is a promising technology to detect atmospheric CO2. However, the traditional DIAL system is the dual-wavelength DIAL (DW-DI...
Conference Paper
Full-text available
The accurate estimation of deposits adhering on insulators is critical to prevent pollution flashovers which cause huge costs worldwide. The traditional evaluation method of insulator contaminations (IC) is based sparse manual in-situ measurements, resulting in insufficient spatial representativeness and poor timeliness. Filling that gap, we propos...
Article
Full-text available
The accurate estimation of deposits adhering on insulators is critical to prevent pollution flashovers which cause huge costs worldwide. The traditional evaluation method of insulator contaminations (IC) is based sparse manual in-situ measurements, resulting in insufficient spatial representativeness and poor timeliness. Filling that gap, we propos...
Article
Full-text available
Differential absorption lidar (DIAL) remote sensing is a promising technology for atmospheric CO2 detection. However, stringent wavelength accuracy and stability are required in DIAL system. Accurate on-line wavelength calibration is a crucial procedure for retrieving atmospheric CO2 concentration using the DIAL, particularly when pulsed lasers are...
Article
Full-text available
Differential absorption lidar (DIAL) remote sensing is a promising technology for atmospheric CO<sub>2</sub> detection. However, stringent wavelength accuracy and stability are required in DIAL system. Accurate on-line wavelength calibration is a crucial procedure for retrieving atmospheric CO<sub>2</sub> concentration using the DIAL, particularly...
Article
Full-text available
A differential absorption lidar (CO2-VDIAL), which is designed for vertical CO2 profile retrieving by using aerosolscattered signals, is demonstrated in this paper. To our knowledge, it is the first time that a dye laser has been utilized to realize the wavelength modulation for a CO2-DIAL/IPDA system. Such a design scheme greatly reduces both the...
Article
The differential absorption lidar (DIAL) can help us to obtain the vertical distribution of the atmospheric CO2 concentration, which is important to the study of carbon sources and carbon sinks. We design a seeder injected pulsed laser system, working as the laser source of the CO2 DIAL. Unlike the other CO2 DIALs, our laser source is the result of...
Article
Full-text available
Accurately measuring the differential molecular absorption cross section is the key to obtaining a high-precision concentration of atmospheric trace gases in a differential absorption lidar (DIAL) system. However, the CO2 absorption line is meticulous at 1.6 μm, easily translating and broadening because of the change of temperature and pressure. He...
Article
Full-text available
Aerosol scattering and absorption properties were continuously measured and analyzed at the urban Laboratory for Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS) site in Wuhan, central China, from 1 December 2009 to 31 March 2014. The mean aerosol scattering coefficient σs, absorption coefficient σab, and single scatterin...
Article
Full-text available
High-accuracy on-line wavelength stabilization is required for differential absorption lidar (DIAL), which is ideal for precisely measuring atmospheric CO2 concentration. Using a difference-frequency laser, we developed a ground-based 1.57-μm pulsed DIAL for performing atmospheric CO2 measurements. Owing to the system complexity, lacking phase, and...
Article
Full-text available
The accurate estimation of deposits adhering on insulators is of great significance to prevent pollution flashovers which cause huge costs worldwide. Researchers have developed sensors using different technologies to monitor insulator contamination on a fine time scale. However, there is lack of analysis of these data to reveal spatial and temporal...
Article
Full-text available
Differential absorption lidar (DIAL) is widely accepted as the most promising remote sensing means to map the global CO2 concentrations. Nevertheless, diurnal variations and vertical distributions of atmospheric CO2 cannot be obtained by satellite-borne and airborne measurements. Ground-based DIAL systems are developed to fill this gap as well as s...
Article
Accurate on-line wavelength calibration is a crucial procedure for sensing atmospheric CO2using the DIAL technique. Drastic fluctuations in the intensity of a pulsed laser pose a great challenge for accurate on-line wavelength determination and stabilization, resulting in CO2retrievals lacking the desired accuracy for global climate change and carb...
Article
Full-text available
Accurate on-line wavelength calibration is a crucial procedure for sensing atmospheric CO2 using the DIAL technique. Drastic fluctuations in the intensity of a pulsed laser pose a great challenge for accurate on-line wavelength determination and stabilization, resulting in CO2 retrievals lacking the desired accuracy for global climate change and ca...