18 research outputs found
Retrieval of aerosol properties from ceilometer and photometer measurements: long-term evaluation with in situ data and statistical analysis at Montsec (southern Pyrenees)
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.This research has been supported by the Spanish
Ministry of Science and Education (grant nos. CGL2012-39623-
C02/00 and CGL2016-78594-R), the Generalitat Catalunya (grant
no. AGAUR 2017 SGR0041) and the H2020 Research Infrastructures
(ACTRIS-2, grant no. 654109)
Merging regional and global aerosol optical depth records from major available satellite products
Satellite instruments provide a vantage point for studying aerosol loading consistently over different regions of the world. However, the typical lifetime of a single satellite platform is on the order of 5-15 years; thus, for climate studies, the use of multiple satellite sensors should be considered. Discrepancies exist between aerosol optical depth (AOD) products due to differences in their information content, spatial and temporal sampling, calibration, cloud masking, and algorithmic assumptions. Users of satellite-based AOD time-series are confronted with the challenge of choosing an appropriate dataset for the intended application. In this study, 16 monthly AOD products obtained from different satellite sensors and with different algorithms were inter-compared and evaluated against Aerosol Robotic Network (AERONET) monthly AOD. Global and regional analyses indicate that products tend to agree qualitatively on the annual, seasonal and monthly timescales but may be offset in magnitude. Several approaches were then investigated to merge the AOD records from different satellites and create an optimised AOD dataset. With few exceptions, all merging approaches lead to similar results, indicating the robustness and stability of the merged AOD products. We introduce a gridded monthly AOD merged product for the period 1995-2017. We show that the quality of the merged product is as least as
good as that of individual products. Optimal agreement of the AOD merged product with AERONET further demonstrates the advantage of merging multiple products. This merged dataset provides a long-term perspective on AOD changes over different regions of the world, and users are encouraged to use this dataset
Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm
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 nighttime
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).This research has been supported by the
European Union through the H2020 programme (ACTRIS-2,
grant no. 654109) and the Spanish Ministry of Economy and
Competitiveness (projects CMT2015-66742-R, CGL2016-81092-
R, CGL2017-85344-R, RTI2018-097864-B-I00 and CGL2017-
90884-REDT)
Asymptotic methods of statistical estimation when solving diffusion of light inverse problems and their implementation in diffraction spectrometry
The work covers the development of methods of information contents analysis and methods of optimization of interpretation procedures of optical data on the basis of utilization of asymptotic of statistical estimation. Methods of analysis of information contents of the initial data, taking into account the contribution of a priory estimation, have been developed. Optimized iteration methods for solving linear inverse problems of diffusion of light have been suggested. Schemes for optimization of intricate optical experiments have been offered. Algorithms for optical data processing within the framework of laser diffraction spectroscopy method have been developed. Field of application: processing of optical experiments dataAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio
A Correlated Multi-Pixel Inversion Approach for Aerosol Remote Sensing
International audienceAerosol retrieval algorithms used in conjunction with remote sensing are subject to ill-posedness. To mitigate non-uniqueness, extra constraints (in addition to observations) are valuable for stabilizing the inversion process. This paper focuses on the imposition of an empirical correlation constraint on the retrieved aerosol parameters. This constraint reflects the empirical dependency between different aerosol parameters, thereby reducing the number of degrees of freedom and enabling accelerated computation of the radiation fields associated with neighboring pixels. A cross-pixel constraint that capitalizes on the smooth spatial variations of aerosol properties was built into the original multi-pixel inversion approach. Here, the spatial smoothness condition is imposed on principal components (PCs) of the aerosol model, and on the corresponding PC weights, where the PCs are used to characterize departures from the mean. Mutual orthogonality and unit length of the PC vectors, as well as zero sum of the PC weights also impose stabilizing constraints on the retrieval. Capitalizing on the dependencies among aerosol parameters and the mutual orthogonality of PCs, a perturbation-based radiative transfer computation scheme is developed. It uses a few dominant PCs to capture the difference in the radiation fields across an imaged area. The approach is tested using 27 observations acquired by the Airborne Multiangle SpectroPolarimetric Imager (AirMSPI) during multiple NASA field campaigns and validated using collocated AERONET observations. In particular, aerosol optical depth, single scattering albedo, aerosol size, and refractive index are compared with AERONET aerosol reference data. Retrieval uncertainty is formulated by accounting for both instrumental errors and the effects of multiple types of constraints
Effects of the shape distribution of aerosol particles on their volumetric scattering properties and the radiative transfer through the atmosphere that includes polarization
International audienc
Retrieval of aerosol properties from Airborne Hyper-Angular Rainbow Polarimeter (AirHARP) observations during ACEPOL 2017
International audienc
Retrieval of 500 m Aerosol Optical Depths from MODIS Measurements over Urban Surfaces under Heavy Aerosol Loading Conditions in Winter
International audienceModerate Resolution Imaging Spectroradiometer (MODIS) aerosol products are used worldwide for their reliable accuracy. However, the aerosol optical depth (AOD) usually retrieved by the operational dark target (DT) algorithm of MODIS has been missing for most of the urban regions in Central China. This was due to a high surface reflectance and heavy aerosol loading, especially in winter, when a high cloud cover fraction and the frequent occurrence of haze events reduce the number of effective satellite observations. The retrieval of the AOD from limited satellite data is much needed and important for further aerosol investigations. In this paper, we propose an improved AOD retrieval method for 500 m MODIS data, which is based on an extended surface reflectance estimation scheme and dynamic aerosol models derived from ground-based sun-photometric observations. This improved method was applied to retrieve AOD during heavy aerosol loading and effectively complements the scarcity of AOD in correspondence with urban surface of a higher spatial resolution. The validation results showed that the retrieved AOD was consistent with MODIS DT AOD (R =~0.87; RMSE =~0.11) and ground measurements (R =~0.89; RMSE =~0.15) from both the Terra and the Aqua satellite. The method can be easily applied to different urban environments affected by air pollution and contributes to the research on aerosol
Validation of POLDER GRASP aerosol optical retrieval over China using SONET observations
International audienc
Retrieval of aerosol components directly from satellite and ground-based measurements
International audienc