scholarly journals Statistical analysis of aerosol optical properties retrieved by Raman lidar over Southeastern Spain

Tellus B ◽  
2013 ◽  
Vol 65 (1) ◽  
pp. 21234 ◽  
Author(s):  
Francisco Navas-Guzmán ◽  
Juan Antonio Bravo-Aranda ◽  
Juan Luis Guerrero-Rascado ◽  
María José Granados-Muñoz ◽  
LUCAS Alados-Arboledas
Keyword(s):  
Optical Properties ◽  
Statistical Analysis ◽  
Raman Lidar ◽  
Aerosol Optical Properties ◽  
Southeastern Spain

scholarly journals Joint elastic side-scattering LIDAR and Raman LIDAR measurements of aerosol optical properties in south east Colorado

2017 ◽  
Vol 12 (03) ◽  
pp. P03008-P03008 ◽  
Author(s):  
L. Wiencke ◽  
V. Rizi ◽  
M. Will ◽  
C. Allen ◽  
A. Botts ◽  
...  
Keyword(s):  
Optical Properties ◽  
Raman Lidar ◽  
Aerosol Optical Properties ◽  
Lidar Measurements

scholarly journals Studies on Aerosol Optical Properties at High Altitude Station in Western Himalayas Using Raman Lidar

2020 ◽  
Vol 237 ◽  
pp. 02034
Author(s):  
Shishir Kumar Singh ◽  
Jaswant ◽  
S.R. Radhakrishnan ◽  
Davender Sethi ◽  
Chhemendra Sharma
Keyword(s):  
Optical Properties ◽  
Extinction Coefficient ◽  
Spherical Particles ◽  
Western Himalayas ◽  
Depolarization Ratio ◽  
Raman Lidar ◽  
Inversion Algorithm ◽  
Backscatter Coefficient ◽  
Aerosol Optical Properties ◽  
Linear Depolarization Ratio

The aerosol optical properties have been investigated using the Raman lidar system for the month of November 2018 at the western Himalayan station of Palampur. Before deriving the optical properties, the lidar data has been applied with initial pre-processing such as Dead time correction, atmospheric noise correction, temporal and spatial averaging, range correction, gluing etc. The optical properties such as backscatter coefficient, extinction coefficient and linear depolarization ratio have been derived by using the inversion algorithm proposed by Fernald. The results show that the backscatter coefficient was found in the range from 9.00E-9 m−1sr−1 to 4.97E-6 m−1sr−1 and the extinction coefficient was found in the range from 3.16E-7m-1 to 1.74E-4m-1. The Linear depolarization ratio was in the range from 0.0179 to 0.621 with lower values at near heights suggesting the dominance of spherical particles at the lower heights. We have also observed a cloud layer at a height of 9.5 km to 12.1 km with high depolarization ratio during the observation period on 22/11/2018.

Improved method to retrieve aerosol optical properties from combined elastic backscatter and Raman lidar data

2013 ◽  
Vol 116 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Jia Su ◽  
Yonghua Wu ◽  
M. Patrick McCormick ◽  
Liqiao Lei ◽  
Robert B. Lee
Keyword(s):  
Optical Properties ◽  
Lidar Data ◽  
Raman Lidar ◽  
Improved Method ◽  
Aerosol Optical Properties

scholarly journals Seasonal variability of aerosol optical properties observed by means of a Raman lidar at an EARLINET site over Northeastern Spain

2011 ◽  
Vol 11 (1) ◽  
pp. 175-190 ◽  
Author(s):  
M. Sicard ◽  
F. Rocadenbosch ◽  
M. N. M. Reba ◽  
A. Comerón ◽  
S. Tomás ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Optical Properties ◽  
Planetary Boundary Layer ◽  
Optical Thickness ◽  
Seasonal Variability ◽  
Aerosol Optical Thickness ◽  
Saharan Dust ◽  
Raman Lidar ◽  
Aerosol Optical Properties ◽  
Lidar Ratio

Abstract. The annual and seasonal variability of aerosol optical properties observed by means of a Raman lidar over Northeastern Spain has been assessed. The lidar representativeness has first been checked against sun-photometer measurements in terms of aerosol optical thickness. Then the annual cycle and the seasonal variability of the planetary boundary layer aerosol optical thickness and its fraction compared to the columnar optical thickness, the lidar ratio, the backscatter-related Ångström exponent and the planetary boundary layer height are analyzed and discussed. Winter and summer mean profiles of extinction, backscatter and lidar ratio retrieved with the Raman algorithm are presented. The analysis shows the impact of most of the natural events (Saharan dust intrusions, wildfires, etc.) and meteorological situations (summer anticyclonic situation, the formation of the Iberian thermal low, winter long-range transport from North Europe and/or North America, re-circulation flows, etc.) occurring in the Barcelona area. A detailed study of a special event including a combined intrusion of Saharan dust and biomass-burning particles proves the suitability of combining the retrieval of aerosol optical properties from Raman and pure elastic lidar measurements to discriminate spatially different types of aerosols and to follow their spatial and temporal evolution.

scholarly journals Retrieval of aerosol properties from ceilometer and photometer measurements: long-term evaluation with in situ data and statistical analysis at Montsec (southern Pyrenees)

2019 ◽  
Vol 12 (6) ◽  
pp. 3255-3267 ◽  
Author(s):  
Gloria Titos ◽  
Marina Ealo ◽  
Roberto Román ◽  
Alberto Cazorla ◽  
Yolanda Sola ◽  
...  
Keyword(s):  
Optical Properties ◽  
Statistical Analysis ◽  
North African ◽  
Aerosol Optical Properties ◽  
In Situ Data ◽  
Term Evaluation ◽  
Air Mass Origin ◽  
Aerosol Volume

Abstract. Given the need for accurate knowledge of aerosol microphysical and optical properties with height resolution, various algorithms combining vertically resolved and column-integrated aerosol information have been developed in the last years. Here we present new results of vertically resolved extensive aerosol optical properties (backscattering, scattering and extinction) and volume concentrations retrieved with the GRASP (Generalized Retrieval of Aerosol and Surface Properties) algorithm over a 3-year period. The range-corrected signal (RCS) at 1064 nm measured with a ceilometer and the aerosol optical depth (AOD) and sky radiances from a sun/sky photometer have been used as input for this algorithm. We perform a detailed evaluation of GRASP retrievals with simultaneous in situ measurements performed at the same height, at the Montsec mountaintop observatory (MSA) in the Pre-Pyrenees (northeastern Spain). This is the first long-term evaluation of various outputs of this algorithm; previous evaluations focused only on the study of aerosol volume concentration for short-term periods. In general, our results show good agreement between techniques although GRASP inversions yield higher values than those measured in situ. The statistical analysis of the extinction coefficient vertical profiles shows a clear seasonality as well as significant differences depending on the air mass origin. The observed seasonal cycle is mainly modulated by a higher development of the atmospheric boundary layer (ABL) during warm months, which favors the transport of pollutants to MSA, and higher influence of regional and North African episodes. On the other hand, in winter, MSA is frequently influenced by free-troposphere conditions and venting periods and therefore lower extinction coefficients that markedly decrease with height. This study shows the potentiality of implementing GRASP in ceilometer and lidar networks for obtaining aerosol optical properties and volume concentrations at multiple sites, which will definitely contribute to enhancing the representativeness of the aerosol vertical distribution as well as to providing useful information for satellite and global model evaluation.

Measurements of Aerosol Optical Properties by Raman Lidar

2010 ◽  
Vol 39 (7) ◽  
pp. 1340-1344 ◽  
Author(s):  
张金业 ZHANG Jin-ye ◽  
龚威 GONG Wei ◽  
黄楚云 HUANG Chu-yun ◽  
李俊 LI Jun
Keyword(s):  
Optical Properties ◽  
Raman Lidar ◽  
Aerosol Optical Properties

scholarly journals Raman Lidar Observations of Aerosol Optical Properties in 11 Cities from France to Siberia

2017 ◽  
Vol 9 (10) ◽  
pp. 978 ◽  
Author(s):  
Elsa Dieudonné ◽  
Patrick Chazette ◽  
Fabien Marnas ◽  
Julien Totems ◽  
Xiaoxia Shang
Keyword(s):  
Optical Properties ◽  
Raman Lidar ◽  
Aerosol Optical Properties ◽  
Lidar Observations

scholarly journals Seasonal variability of aerosol optical properties observed by means of an elastic-Raman lidar over Northeastern Spain

2010 ◽  
Vol 10 (6) ◽  
pp. 14053-14094
Author(s):  
M. Sicard ◽  
M. N. M. Reba ◽  
F. Rocadenbosch ◽  
A. Comerón ◽  
S. Tomás ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Optical Properties ◽  
Planetary Boundary Layer ◽  
Optical Thickness ◽  
Seasonal Variability ◽  
Aerosol Optical Thickness ◽  
Saharan Dust ◽  
Raman Lidar ◽  
Aerosol Optical Properties ◽  
Lidar Ratio

Abstract. The annual and seasonal variability of aerosol optical properties observed by means of an elastic-Raman lidar over Northeastern Spain has been assessed. The lidar representativeness has first been checked against sun-photometer measurements in terms of aerosol optical thickness. Then the annual cycle and the seasonal variability of the planetary boundary layer aerosol optical thickness and its fraction compared to the columnar optical thickness, the lidar ratio, the backscatter-related Ångström exponent and the planetary boundary layer height have been analyzed and discussed. Winter and summer mean profiles of extinction, backscatter and lidar ratio retrieved with the Raman algorithm have been presented. The analysis shows the impact of most of the natural events (Saharan dust intrusions, wildfires, etc.) and meteorological situations (summer anticyclonic situation, the formation of the Iberian thermal low, winter long-range transport from North Europe and/or North America, re-circulation flows, etc.) occurring in the Barcelona area. A detail study of a special event including a combined intrusion of Saharan dust and biomass-burning particles has proven the suitability of combining nighttime Raman- and daytime pure elastic-inversions to discriminate spatially different types of aerosols and to follow their spatial and temporal evolution.

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