Latin American Lidar Network (LALINET) for aerosol research: Diagnosis on network instrumentation

Guerrero-Rascado, Juan Luís; Landulfo, Eduardo; Antuña, Juan Carlos; Barbosa, H. M.; Barja, Boris; Bastidas, Álvaro; Bedoya, Andrés Esteban; Costa, Renata F. da; Estevan, René; Forno, Ricardo; Gouveia, D. A.; Jiménez, Cristofer; Larroza, Eliane G.; Lopes, Fábio; Montilla-Rosero, Elena; Moreira, Gregori de Arruda; Nakaema, Walker Morinobu; Nisperuza, Daniel; Alegría, Dairo; Múnera, Mauricio; Otero, Lidia Ana; Papandrea, Sebastián; Pallota, J.; Pawelko, Ezequiel Eduardo; Quel, E. J.; Ristori, P.; Rodrigues, Patrícia F.; Salvador, Jacobo; Sánchez, Maria Fernanda; Silva, Ana Maria

doi:10.1016/j.jastp.2016.01.001

Cited by 55 publications

(37 citation statements)

References 38 publications

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“…Lidar networks such as EARLINET (European Aerosol Research LIdar NETwork; Pappalardo et al, 2014), LA-LINET (Latin American LIdar NETwork;Guerrero-Rascado et al, 2016;Antuña-Marrero et al, 2017) and MPLNET (Micro-Pulse Lidar Network) (Welton et al, 2002) provide information about aerosol vertical distribution. However, many of the lidar systems operating in these networks are basic lidar systems which only have information on the backscatter elastic signals and only allow the retrieval of the vertical profiles of the aerosol backscatter coefficient (β) by the Klett-Fernald method (Fernald et al, 1972;Fernald, 1984;Klett, 1981Klett, , 1985 and of the corresponding aerosol extinction (α) coefficient by assuming a constant aerosol extinction-to-backscattering ratio, which is called the lidar ratio (LR).…”

Section: Introductionmentioning

confidence: 99%

Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm

et al. 2019

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Abstract. This study evaluates the potential of the GRASP algorithm (Generalized Retrieval of Aerosol and Surface Properties) to retrieve continuous day-to-night aerosol properties, both column-integrated and vertically resolved. The study is focused on the evaluation of GRASP retrievals during an intense Saharan dust event that occurred during the Sierra Nevada Lidar aerOsol Profiling Experiment I (SLOPE I) field campaign. For daytime aerosol retrievals, we combined the measurements of the ground-based lidar from EARLINET (European Aerosol Research Lidar Network) station and sun–sky photometer from AERONET (Aerosol Robotic Network), both instruments co-located in Granada (Spain). However, for night-time retrievals three different combinations of active and passive remote-sensing measurements are proposed. The first scheme (N0) uses lidar night-time measurements in combination with the interpolation of sun–sky daytime measurements. The other two schemes combine lidar night-time measurements with night-time aerosol optical depth obtained by lunar photometry either using intensive properties of the aerosol retrieved during sun–sky daytime measurements (N1) or using the Moon aureole radiance obtained by sky camera images (N2). Evaluations of the columnar aerosol properties retrieved by GRASP are done versus standard AERONET retrievals. The coherence of day-to-night evolutions of the different aerosol properties retrieved by GRASP is also studied. The extinction coefficient vertical profiles retrieved by GRASP are compared with the profiles calculated by the Raman technique at night-time with differences below 30 % for all schemes at 355, 532 and 1064 nm. Finally, the volume concentration and scattering coefficient retrieved by GRASP at 2500 m a.s.l. are evaluated by in situ measurements at this height at Sierra Nevada Station. The differences between GRASP and in situ measurements are similar for the different schemes, with differences below 30 % for both volume concentration and scattering coefficient. In general, for the scattering coefficient, the GRASP N0 and N1 show better results than the GRASP N2 schemes, while for volume concentration, GRASP N2 shows the lowest differences against in situ measurements (around 10 %) for high aerosol optical depth values.

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Section: Introductionmentioning

confidence: 99%

Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm

et al. 2019

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“…This is the case of the global NASA MPLNET network (Micro-Pulse Lidar Network; Lewis et al, 2016) developed for continuous measurements of aerosol and cloud vertical profiles at different sites in the world using standard instrument and data processing algorithms. The EARLINET (European Aerosol Research LIdar NETwork; Pappalardo et al, 2014) and LA-LINET (Latin American LIdar NETwork; Guerrero-Rascado et al, 2016) have also been established in order to provide long-term database for the vertical and temporal distribution of aerosols over Europe and Latin America, respectively.…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of GRASP algorithm for a dust event over Granada (Spain) during ChArMEx-ADRIMED 2013 campaign

et al. 2017

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Abstract. In this study, vertical profiles and columnintegrated aerosol properties retrieved by the GRASP (Generalized Retrieval of Atmosphere and Surface Properties) algorithm are evaluated with in situ airborne measurements made during the ChArMEx-ADRIMED field campaign in summer 2013. In the framework of this campaign, two different flights took place over Granada (Spain) during a desert dust episode on 16 and 17 June. The GRASP algorithm, which combines lidar and sun-sky photometer data measured at Granada, was used to retrieve aerosol properties. Two sun-photometer datasets are used: one co-located with the lidar system and the other in the Cerro Poyos station, approximately 1200 m higher than the lidar system but at a short horizontal distance.Column-integrated aerosol microphysical properties retrieved by GRASP are compared with AERONET products showing a good agreement. Differences between GRASP retrievals and airborne extinction profiles are in the range of 15 to 30 %, depending on the instrument on board the aircraft used as reference. On 16 June, a case where the dust layer was coupled to the aerosol layer close to surface, the total volume concentration differences between in situ data and GRASP retrieval are 15 and 36 % for Granada and Cerro Poyos retrievals, respectively. In contrast, on 17 June the dust layer was decoupled from the aerosol layer close to the surface, and the differences are around 17 % for both retrievals. In general, all the discrepancies found are within the uncertainly limits, showing the robustness and reliability of the GRASP algorithm. However, the better agreement found for the Cerro Poyos retrieval with the aircraft data and the vertical homogeneity of certain properties retrieved with GRASP, such as the scattering Ångström exponent, for cases with aerosol layers characterized by different aerosol types, shows that uncertainties in the vertical distribution of the aerosol properties have to be considered.The comparison presented here between GRASP and other algorithms (i.e. AERONET and LIRIC) and with airborne in situ measurements shows the potential to retrieve the optical and microphysical profiles of the atmospheric aerosol properties. Also, the advantage of GRASP versus LIRIC is that GRASP does not assume the results of the AERONET inversion as a starting point.

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“…It began as a series of bi-annual workshops in 2001, fostering a Latin American lidar community engaged on lidar measurements of aerosols and other atmospheric species such as ozone and water vapor. LALINET was formalized in 2013, becoming the youngest affiliate of the GAW Aerosol Lidar Observation Network (GALION) [9,10,11]. LALINET consists of groups from different countries of Latin America and is a contributing network to the Global Atmosphere Watch (GAW) via GALION [12].…”

Section: A Lalinetmentioning

confidence: 99%

Standardizing the determination of the molecular backscatter coefficient profiles for LALINET lidar stations using ERA- Interim Reanalysis

Rodríguez-Vega¹,

Marrero²

2017

Opt. Pura Apl.

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ABSTRACT:The molecular backscatter signal is necessary in aerosol lidars to determine the aerosol backscatter and extinction. It is derived using atmospheric temperature and pressure profiles from simultaneous soundings or climatological values from radiosonde measurements. In cases when no radiosonde measurements are available at or near the lidar stations the U.S. Standard Atmosphere is commonly used. Although the atmospheric reanalysis can also be used to obtain the atmospheric temperature and pressure profiles at any station, we found no reports of its use for this purpose. Therefore, the goal of this research is to compare molecular backscatter coefficients derived from radiosonde measurements with ones derived using the ERA-Interim reanalysis and the U.S. Standard Atmosphere 1976 (USSA-1976), for the locations of the lidar stations from the Latin America Lidar Network (LALINET). The differences between radiosonde measurements and ERA-Interim temperature profiles are smaller than the differences between radiosonde measurements and the USSA-1976 temperature profiles. In many stations, the differences between the temperature in radiosonde measurements and ERA-Interim are smaller than 2 K and the greatest differences are about 4 K. However, the differences between temperature in radiosonde measurements and in the USSA-1976 are smaller than 10 K only in three stations, and the greatest differences are about 20 K. The profiles of relative differences of the molecular backscatter coefficients between radiosonde measurements and ERA-Interim show negative values at most of the pressure levels. Positive values greater than 0.5 % are only observed above 8 km. However, the profiles of relative differences of the molecular backscatter coefficients between radiosonde measurements and the USSA-1976 shows positive values from surface to 12 km in all stations. Only in four stations are observed negative differences above 14 km with values smaller than -5 %. Comodoro Rivadavia presents the best behavior because is located near to 45 degree of latitude, but even in this station the differences between radiosonde measurements and the USSA-1976 are bigger than those observed between radiosonde measurements and ERA-Interim.

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Latin American Lidar Network (LALINET) for aerosol research: Diagnosis on network instrumentation

Cited by 55 publications

References 38 publications

Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm

Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm

Comparative assessment of GRASP algorithm for a dust event over Granada (Spain) during ChArMEx-ADRIMED 2013 campaign

Standardizing the determination of the molecular backscatter coefficient profiles for LALINET lidar stations using ERA- Interim Reanalysis

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