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Development of Raman Lidar for Remote Sensing of CO2 Leakage at an Artificial Carbon Capture and Storage Site
摘要： We developed a Raman lidar system that can remotely detect CO2 leakage and its volume mixing ratio (VMR). The system consists of a laser, a telescope, an optical receiver, and detectors. Indoor CO2 cell measurements show that the accuracy of the Raman lidar is 99.89%. Field measurements were carried out over a four-day period in November 2017 at the Eumsong Environmental Impact Evaluation Test Facility (EIT), Korea, where a CO2 leak was located 0.2 km from the Raman lidar. The results show good agreement between CO2 VMR measured by the Raman lidar system (CO2 VMRRaman LIDAR) and that measured by in situ instruments (CO2 VMRIn-situ). The correlation coefficient (R), mean absolute error (MAE), root mean square error (RMSE), and percentage difference between CO2 VMRIn-situ and CO2 VMRRaman LIDAR are 0.81, 0.27%, 0.37%, and 4.92%, respectively. The results indicate that Raman lidar is an effective tool in detecting CO2 leakage and in measuring CO2 VMR remotely.
关键词： CO2,CO2 leakage remote sensing,Carbon capture and storage,Raman lidar
更新于2025-09-23 15:22:29
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Retrieval of aerosol profiles by Raman lidar with dynamic determination of the lidar equation reference height
摘要： A reference height that often needs to be assumed in aerosol retrieval from Raman lidar tends to cause high uncertainty in retrieving the vertical distribution of aerosol optical properties. Here, a novel method is proposed to determine the height-revolved reference height, which is then used to retrieve aerosols from Raman lidar. This method can automatically avoid the atmospheric layers with the presence of aerosols, clouds and low signal to noise ratio (SNR). Based on elastic (at 355 nm) and inelastic (at 387 nm) signals collected during the period from 5 December 2016 to 5 March 2017 by a ground-based Raman lidar in Beijing, China, the aerosol optical properties, such as extinction coefficient, backscattering coefficient and lidar ratio have been successfully retrieved. Results show that the averaged nighttime aerosol optic depth (AOD) from Raman lidar is in good agreement with early morning AOD retrieved from a collocated sunphotometer. The AOD exhibits a strong diurnal variation with a peak at 1500 Beijing time. On average, the nighttime AOD at 355nm is 0.32, whereas the daytime AOD is 0.72 over Beijing during the study period. The column averaged lidar ratio is 44 sr at 355 nm, roughly consistent with previous studies. Our findings shed light on the pathways towards improving the retrieval of vertical distribution of aerosols optical properties during nighttime.
关键词： backscattering coefficients,Raman lidar,AOD,reference height
更新于2025-09-23 15:21:01
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Hydrogen Sulfide Molecules Lidar Sensing in the Atmosphere
摘要： The optimum operation modes of the Raman lidar and the differential absorption and scattering lidar for the hydrogen sulfide molecules sensing in the atmosphere at the low permissible concentration level have been studied and the error estimation of the hydrogen sulfide molecules concentration measurement in the atmosphere by the Raman lidar and the differential absorption and scattering lidar has been executed. The computer simulation of the two types of such a lidar equations has been fulfilled for this purpose. The measurement relative accuracy for the range of the studied molecules concentration of 1011–1014 cm–3 at the 3.83 μ laser radiation wavelength and the ranging distances from 10 do1000 m lies in the range of 20–26% for the differential absorption and scattering lidar.
关键词： ranging distance,hydrogen sulfide molecules,laser radiation,concentration level,Raman lidar,differential absorption and scattering lidar
更新于2025-09-09 09:28:46
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First application of the optimal estimation method to retrieve temperature from pure rotational raman scatter lidar measurements
摘要： We present the application of the Optimal Estimation Method (OEM) to retrieve atmospheric temperatures from pure rotational Raman (PRR) backscatter lidar measurements. A forward model (FM) is developed to retrieve temperature and tested using synthetic measurements. The OEM offers many advantages for this analysis, including eliminating the need to determine temperature calibration coefficients.
关键词： forward model,pure rotational Raman,Optimal Estimation Method,Raman lidar,temperature retrieval
更新于2025-09-09 09:28:46
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Mathematical Tool for a Closure Study of Aerosol Microphysical Property Retrieval Using Lidar and Photometer Data
摘要： We present a project combining lidar, photometer and particle counter data with a regularization software tool for a closure study of aerosol microphysical property retrieval. In a first step only lidar data are used to retrieve the particle size distribution (PSD). Secondly, photometer data are added, which results in a good consistency of the retrieved PSDs. Finally, those retrieved PSDs may be compared with the measured PSD from a particle counter. The data here were taken in Ny Alesund, Svalbard, as an example.
关键词： Raman lidar,regularization,particle microphysics,inversion,photometer,Aerosol
更新于2025-09-09 09:28:46
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Clear-air lidar dark band
摘要： This paper illustrates measurements carried out by the Raman lidar BASIL in the frame of the HD(CP)2) Observational Prototype Experiment (HOPE), revealing the presence of a clear-air dark band phenomenon (i.e. a minimum in lidar backscatter echoes) in the upper portion of the convective boundary layer. The phenomenon is clearly distinguishable in the lidar backscatter echoes at 532 and 1064 nm, as well as in the particle depolarization data. This phenomenon is attributed to the presence of lignite aerosol particles advected from the surrounding open pit mines in the vicinity of the measuring site. The paper provides evidence of the phenomenon and illustrates possible interpretations for its occurrence.
关键词： convective boundary layer,backscatter echoes,Raman lidar,clear-air dark band,lignite aerosol particles
更新于2025-09-09 09:28:46
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Calibration of a water vapour Raman lidar with a kite-based humidity sensor
摘要： We present a calibration method for a water vapour Raman lidar using a meteorological probe lifted by a kite, ?own steadily above the lidar site, within the framework of the Hydrological Cycle in the Mediterranean Experiment (HyMeX) and Chemistry-Aerosol Mediterranean Experiment (ChArMEx) campaigns. The experiment was carried out in Menorca (Spain) during June 2013, using the mobile water vapour and aerosol lidar WALI. Calibration using a kite demonstrated a much better degree of co-location with the lidar system than that which could be achieved with radiosondes, and it allowed us to determine the overlap function and calibration factor simultaneously. The range-dependent water vapour lidar calibration was thus determined with an uncertainty of 2 % in the 90–8000 m altitude range. Lidar water vapour measurements are further compared with radiosondes, showing very good agreement in the lower troposphere (1–5 km) and a relative difference and standard deviation of 5 and 9 % respectively. Moreover, a reasonable agreement with MODIS-integrated water vapour content is found, with a relative mean and standard deviation of 3 and 16 % respectively. However, a discrepancy is found with AERONET retrievals, showing the latter to be underestimated by 28 %. Reanalyses by the ECMWF/IFS numerical weather prediction model also agree with the temporal evolution highlighted with the lidar, with no measurable drift in integrated water vapour content over the period.
关键词： kite,HyMeX,MODIS,AERONET,calibration,ECMWF/IFS,Raman lidar,ChArMEx,water vapour,WALI
更新于2025-09-09 09:28:46