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Article ; Online: The impact of different aerosol layering conditions on the high-resolution MODIS/MAIAC AOD retrieval bias: The uncertainty analysis

Rogozovsky, Irina / Ohneiser, Kevin / Lyapustin, Alexei / Ansmann, Albert / Chudnovsky, Alexandra

Atmospheric Environment. 2023 Sept., v. 309 p.119930-

2023

Abstract: The Eastern Mediterranean/Middle East (EMME) region belongs to one of the most polluted and vulnerable to climate change related areas in the world. To monitor these changes, comprehensive set of measurements need to be conducted. Ground-level monitoring ...

Abstract	The Eastern Mediterranean/Middle East (EMME) region belongs to one of the most polluted and vulnerable to climate change related areas in the world. To monitor these changes, comprehensive set of measurements need to be conducted. Ground-level monitoring sites provide continuous measurements, yet their spatial coverage in EMME is very limited. Satellite data largely expand spatial coverage, however, retrieval accuracy over arid regions with bright surface background, mixed with urban and industrial sources, remains challenging. In this study, we analyzed the agreement between aerosol optical depth (AOD) data from the Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm at 1-km spatial resolution and corresponding ground-based Aerosol Robotic Network (AERONET) measurements, using data from September 2019 to October 2022 in Tel Aviv, Israel. We identified all overestimation and underestimation MAIAC AOD measurements, relative to AERONET, and used multiwavelength polarization lidar observations of vertical aerosol profiles to characterize these conditions. Our findings suggest that under clear atmospheric conditions (AOD¡0.12), MAIAC overestimation prevails, while under dusty (AOD¿0.3), and partially cloudy conditions, MAIAC underestimation prevails. We found that dust component (high particle depolarization ratio, and low Angstrom exponent) is often presented in cases of underestimation, while a single layer overestimation cases typically related to anthropogenic pollution. The two-layers overestimation cases tend to have marine aerosols at the bottom and mixed pollution sources at the top. Our study highlights the importance of studying the different layering conditions that largely bias the MAIAC AOD retrieval accuracy. This knowledge is highly important since AOD is widely used as input variable in numerous modeling studies and air quality applications and rarely prepossessed for such a bias.
Keywords	aerosols ; air quality ; algorithms ; climate change ; dust ; environment ; governmental programs and projects ; lidar ; pollution ; remote sensing ; uncertainty analysis ; Israel ; Middle East ; Aerosol optical depth (AOD) ; Multi-angle implementation of atmospheric correction (MAIAC) ; Polly-lidar ; Atmospheric vertical profile ; MAIAC AOD bias
Language	English
Dates of publication	2023-09
Publishing place	Elsevier Ltd
Document type	Article ; Online
ZDB-ID	216368-8
ISSN	0004-6981 ; 1352-2310
ISSN	0004-6981 ; 1352-2310
DOI	10.1016/j.atmosenv.2023.119930
Database	NAL-Catalogue (AGRICOLA)

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Article: From laboratory to in-situ 3D measurements of complex pollution states in the city: Introducing a general concept using compact multisensory assemblies on UAVs

Lugassi, Rachel / Blank, Alexandra / Rogozovsky, Irina / Ohneiser, Kevin / Ansmann, Albert / Linzon, Yoav / Chudnovsky, Alexandra

Atmospheric environment. 2022 July 15, v. 281

2022

Abstract: In the city, it is still a challenge to implement a mobile measurement device to accurately monitor its complex pollution state. Current research proposes new technological developments and many studies implement an Unmanned Aerial Vehicle (UAV)-based ... ...

Abstract	In the city, it is still a challenge to implement a mobile measurement device to accurately monitor its complex pollution state. Current research proposes new technological developments and many studies implement an Unmanned Aerial Vehicle (UAV)-based platforms. However, many questions arise on the representativeness of such measurements and on the UAV impact on data quality. Here, UAV is used to link between sparsely located ground monitoring sites and lidar station measuring pollution, the latter of which are at heights of typically >200 m. Information at intermediate heights are missing but needed for health studies and also for lidar validation algorithms. In this regard, we propose and demonstrate a UAV-based platform aimed at measuring meteorological and air quality parameters, namely, air temperature (Tₐᵢᵣ), relative humidity (RH) and PM2.5 (Particulate matter pollution with a diameter of less than 2.5 μm) on both compact and large UAV integrations. Each integration was separately investigated both numerically and experimentally in terms of the possible set of instruments used in the setup. In particular, custom-made meteorological shelters were constructed and tested in the laboratory under different propeller conditions. The best placement locations on the UAVs were verified using numerical airflow simulations employing real UAV geometries. Next, we compared between different sensors for Tₐᵢᵣ on a diurnal cycle and deduced the best work time corresponding to minimal impact of the outside conditions (mainly due to direct sun exposure). The influence of propeller rotation on measured parameters has been studied in detail. In addition, a pilot field experiment was conducted in the urban domain using our platform and these measurements were compared to all available data sources. Our field experiment indicated a mixed local pollution layer up to 300 m. Finally, we suggest a practical guideline for carrying out field experiments employing both UAVs. We have also considered the fact that wide use of UAV technologies in crowded cities in the context presented in this paper is currently restricted by regulations and privacy that vary among different countries.
Keywords	air flow ; air quality ; air temperature ; data quality ; environment ; field experimentation ; guidelines ; lidar ; particulates ; pollution ; propellers ; relative humidity
Language	English
Dates of publication	2022-0715
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	216368-8
ISSN	0004-6981 ; 1352-2310
ISSN	0004-6981 ; 1352-2310
DOI	10.1016/j.atmosenv.2022.119146
Database	NAL-Catalogue (AGRICOLA)

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Book: Verbundvorhaben O1 - Supersites - Schwerpunktmessungen: Teilvorhaben 3

Ansmann, Albert

Abstract: Ziel des Projektes ist es, vertikal-aufloesende und raeumlich-abtastende bodengebundene Fernerkundungsbeobachtungen fuer eine bestmoegliche Charakterisierung der atmosphaerischen Saeule ueber und um die 'Supersites' herum zu ermoeglichen. Es werden fuer ... ...

Institution	Leibniz-Institut fuer Troposphaerenforschung e.V. (IFT), Permoserstr. 15, 04318, Leipzig, DE
Abstract	Ziel des Projektes ist es, vertikal-aufloesende und raeumlich-abtastende bodengebundene Fernerkundungsbeobachtungen fuer eine bestmoegliche Charakterisierung der atmosphaerischen Saeule ueber und um die 'Supersites' herum zu ermoeglichen. Es werden fuer die HD(CP)2 Modellevaluierung relevante atmosphaerische Variablen wie Windvektor, Temperatur, Wasserdampf, Aerosole, aber auch Wolken und Niederschlagsparameter abgeleitet. Der Vorteil der Vielzahl an Messgeraeten an den 'Supersites' soll ausgenutzt werden: es werden synergetische Verfahren entwickelt, die physikalische Konsistenz garantieren, aber auch mehr Information hervorbringen als die Messungen einzelner Instrumente. Von Vorrang fuer die erfolgreiche Umsetzung von HD(CP)2 ist die Entwicklung des Aerosol- und Wolkenklassifikationsschemas. Diese Aufgabe wird im ersten Jahr nach Projektstart erfuellt. Im zweiten Projektjahr erfolgt die Implementierung des Verfahrens zur Bestimmung mikrophysikalischer Eigenschaften von Eis- und Mischphasenwolken in das 1DVAR Assimilationsschema des Vorhersagemodells von HD(CP)2. Studien zum Einfluss von Aerosolpartikeln auf die heterogene Eisbildung in Wolken werden im dritten Jahr von HD(CP)2 durchgefuehrt.
Keywords	Aufloesen ; Wasserdampf ; Aerosol ; Wolke ; Synergismus ; Bestimmungsmethode ; Eis ; Partikel ; Klimasystem
Language	German
Document type	Book
Remark	Projektbeginn: 01.10.2012 Projektende: 30.09.2015 Foerdernummer: 01LK1209C
Database	Environmental research database (UFORDAT) of the German Federal Environment Agency (UBA)

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Book ; Online: Potential of polarization/Raman lidar to separate fine dust, coarse dust, maritime, and anthropogenic aerosol profiles

Mamouri, Rodanthi-Elisavet / Ansmann, Albert

eISSN: 1867-8548

2018

Abstract: We applied the recently introduced polarization lidar–photometer networking (POLIPHON) technique for the first time to triple-wavelength polarization lidar measurements at 355, 532, and 1064 nm. The lidar observations were performed at Barbados during ... ...

Abstract	We applied the recently introduced polarization lidar–photometer networking (POLIPHON) technique for the first time to triple-wavelength polarization lidar measurements at 355, 532, and 1064 nm. The lidar observations were performed at Barbados during the Saharan Aerosol Long-Range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE) in the summer of 2014. The POLIPHON method comprises the traditional lidar technique to separate mineral dust and non-dust backscatter contributions and the new, extended approach to separate even the fine and coarse dust backscatter fractions. We show that the traditional and the advanced method are compatible and lead to a consistent set of dust and non-dust profiles at simplified, less complex aerosol layering and mixing conditions as is the case over the remote tropical Atlantic. To derive dust mass concentration profiles from the lidar observations, trustworthy extinction-to-volume conversion factors for fine, coarse, and total dust are needed and obtained from an updated, extended Aerosol Robotic Network sun photometer data analysis of the correlation between the fine, coarse and total dust volume concentration and the respective fine, coarse, and total dust extinction coefficient for all three laser wavelengths. Conversion factors (total volume to extinction) for pure marine aerosol conditions and continental anthropogenic aerosol situations are presented in addition. As a new feature of the POLIPHON data analysis, the Raman lidar method for particle extinction profiling is used to identify the aerosol type (marine or anthropogenic) of the non-dust aerosol fraction. The full POLIPHON methodology was successfully applied to a SALTRACE case and the results are discussed. We conclude that the 532 nm polarization lidar technique has many advantages in comparison to 355 and 1064 nm polarization lidar approaches and leads to the most robust and accurate POLIPHON products.
Subject code	333
Language	English
Publishing date	2018-09-11
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Air-water interactions: The signature of meteorological and air-quality parameters on the chemical characteristics of water produced from the atmosphere

Inbar, Offir / Chudnovsky, Alexandra / Ohneiser, Kevin / Ansmann, Albert / Ratner, Stanislav / Sirota, Roman / Aviv, Yaron / Avisar, Dror

Science of the total environment. 2021 Oct. 10, v. 790

2021

Abstract: Atmospheric water is considered an alternative sustainable solution for global water scarcity. We analyzed the effects of meteorological and air-quality parameters on the chemical characteristics of atmospheric water. First, we measured the chemical ... ...

Abstract	Atmospheric water is considered an alternative sustainable solution for global water scarcity. We analyzed the effects of meteorological and air-quality parameters on the chemical characteristics of atmospheric water. First, we measured the chemical characteristics of water produced by a unique atmospheric water generator (AWG) apparatus in Tel Aviv, Israel. To examine the complex air-water relationships, we obtained atmospheric data from several sources: adjacent air-quality-monitoring stations, aerosol robotic network (AERONET), aerosol pollution profile using PollyXᵀ lidar, and air back-trajectory simulation (HYSPLIT). We found a strong impact of different pollution sources on the water quality. The integration between HYSPLIT, AERONET and lidar analyses shows that the pathway crossed by the air parcel three days before arrival at the site affected the chemical properties of the produced water. Nearby sea salt aerosols from the Mediterranean were persistently observed in the water (medians: sodium 69 μg/L, chloride ions 120 μg/L), corresponding to lidar identification of a sea-breeze layer (30–50 sr lidar ratio in lower elevation). Seasonal variability in climatic conditions affected the concentration of dust-related elements in the water. During dust-storm events, calcium was the most dominant element (median 900 μg/L). Thus, the chemical characteristics of the water can be considered a “footprint” of both regional, local, and phenological composition of the atmosphere.
Keywords	aerosols ; air ; air quality ; calcium ; chlorides ; governmental programs and projects ; lidar ; phenology ; pollution ; seasonal variation ; sodium ; water quality ; water shortages ; Israel
Language	English
Dates of publication	2021-1010
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2021.147940
Database	NAL-Catalogue (AGRICOLA)

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Article: Ground-truth aerosol lidar observations: can the Klett solutions obtained from ground and space be equal for the same aerosol case?

Ansmann, Albert

Applied optics

2006 Volume 45, Issue 14, Page(s) 3367–3371

Abstract: Upcoming multiyear satellite lidar aerosol observations need strong support by a worldwide ground-truth lidar network. In this context the question arises as to whether the ground stations can deliver the same results as obtained from space when the ... ...

Abstract	Upcoming multiyear satellite lidar aerosol observations need strong support by a worldwide ground-truth lidar network. In this context the question arises as to whether the ground stations can deliver the same results as obtained from space when the Klett formalism is applied to elastic backscatter lidar data for the same aerosol case. This question is investigated based on simulations of observed cases of simple and complex aerosol layering. The results show that the differences between spaceborne and ground-based observations can be as large as 20% for the backscatter and extinction coefficients and the optimum estimates of the column lidar ratios. In cases with complex aerosol layering, the application of the two-layer approach can lead to similar results (space, ground) and accurate products provided that horizontally homogeneous aerosol conditions are given.
Language	English
Publishing date	2006-05-10
Publishing country	United States
Document type	Journal Article
ISSN	1559-128X
ISSN	1559-128X
DOI	10.1364/ao.45.003367
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Potential of polarization/Raman lidar to separate fine dust, coarse dust, maritime, and anthropogenic aerosol profiles

Mamouri, Rodanthi-Elisavet / Ansmann, Albert

eISSN: 1867-8548

2017

Abstract: We applied the recently introduced Polarization Lidar Photometer Networking (POLIPHON) technique for the first time to triple-wavelength polarization lidar measurements at 355, 532, and 1064 nm. The lidar observations were performed at Barbados during ... ...

Abstract	We applied the recently introduced Polarization Lidar Photometer Networking (POLIPHON) technique for the first time to triple-wavelength polarization lidar measurements at 355, 532, and 1064 nm. The lidar observations were performed at Barbados during the Saharan Aerosol Long-Range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE) in the summer of 2014. POLIPHON comprises the traditional lidar technique to separate mineral dust and non-dust backscatter contributions and the new extended approach to separate even the dust backscatter component into fine and coarse dust fractions. We show that the traditional and the extended methods are compatible and lead to the same set of dust and non-dust profiles at simplified, less complex aerosol layering and mixing conditions as is the case over the remote tropical Atlantic. To derive dust mass concentration profiles from the lidar observations, trustworthy extinction-to-volume conversion factors are needed and obtained from an updated, extended AERONET sun photometer data analysis of the correlation of fine, coarse and total dust volume concentration with dust extinction coefficients for all three laser wavelengths. Conversion factors for pure marine aerosol conditions and continental anthropogenic aerosol situations are presented in addition. As an additional new feature of POLIPHON, the Raman-lidar method for particle extinction profiling is used to identify the aerosol type (marine or anthropogenic) of the non-dust aerosol fraction. The full POLIPHON methodology was successfully applied to a SALTRACE case and the results are discussed. We conclude that the 532 nm polarization lidar technique has many advantages in comparison to respective 355 and 1064 nm polarization lidar approaches and leads to most robust and accurate POLIPHON products.
Subject code	333
Language	English
Publishing date	2017-05-04
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Characterization of aerosol over the Eastern Mediterranean by polarization sensitive Raman lidar measurements during A-LIFE – aerosol type classification and type separation

Groß, Silke / Freudenthaler, Volker / Haarig, Moritz / Ansmann, Albert / Toledano, Carlos / Mateos, David / Seibert, Petra / Mamouri, Rodanthi-Elisavet / Nisantzi, Argyro / Gasteiger, Josef / Dollner, Maximilian / Tipka, Anne / Schöberl, Manuel / Teri, Marilena / Weinzierl, Bernadett

eISSN:

2024

Abstract: Aerosols are key players in the Earth’s climate system with mineral dust being one major component of the atmospheric aerosol load. While former campaigns focused on investigating the properties and effects of rather pure mineral dust layers, the A-LIFE ( ...

Abstract	Aerosols are key players in the Earth’s climate system with mineral dust being one major component of the atmospheric aerosol load. While former campaigns focused on investigating the properties and effects of rather pure mineral dust layers, the A-LIFE ( A bsorbing aerosol layers in a changing climate: aging, life time and dynamics) campaign in April 2017 aimed to characterize dust in complex aerosol mixtures. In this study we present ground-based lidar measurements that were performed at Limassol, Cyprus, in April 2017. During our measurement period, the measurement site was affected by complex mixtures of dust from different sources and pollution aerosols from local sources as well as long-range transported. We found mean values of the particle linear depolarization ratio and extinction-to-backscatter ratio (lidar ratio) of 0.27 ± 0.02 and 41 sr ± 5 sr at 355 nm and of 0.30 ± 0.02 and 39 sr ± 5 sr at 532 nm for Arabian dust, and of 0.27 ± 0.02 and 55 sr ± 8 sr at 355 nm and of 0.28 ± 0.02 and 53 sr ± 7 sr at 532 nm for Saharan dust. The values found for pollution aerosols of the particle linear depolarization ratio and the lidar ratio are 0.05 ± 0.02 at 355 nm and 0.04 ± 0.02 at 532 nm, and 65 sr ± 12 sr at 355 nm and 60 sr ± 16 sr at 532 nm, respectively. We use our measurements for aerosol typing and compare that to aerosol typing from sun photometer data, in-situ measurements and trajectory analysis. The different methods agree well for the derived aerosol type, but looking at the derived dust mass concentration from different methods, the trajectory analysis frequently underestimate high dust concentration that were found in major mineral dust events.
Subject code	333
Language	English
Publishing date	2024-01-18
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: The implementation of dust mineralogy in COSMO5.05-MUSCAT

Gómez Maqueo Anaya, Sofía / Althausen, Dietrich / Faust, Matthias / Baars, Holger / Heinold, Bernd / Hofer, Julian / Tegen, Ina / Ansmann, Albert / Engelmann, Ronny / Skupin, Annett / Heese, Birgit / Schepanski, Kerstin

eISSN:

2024

Abstract: Mineral dust aerosols are composed of a complex assemblage of various minerals depending on the region in which they originated. Given the different mineral composition of desert dust aerosols, different physicochemical properties and therefore varying ... ...

Abstract	Mineral dust aerosols are composed of a complex assemblage of various minerals depending on the region in which they originated. Given the different mineral composition of desert dust aerosols, different physicochemical properties and therefore varying climate effects are expected. Despite the known regional variations in mineral composition, chemical transport models typically assume that mineral dust aerosols have uniform composition. This study adds, for the first time, mineralogical information to the mineral dust emission scheme used in the chemical transport model COSMO–MUSCAT. We provide a detailed description of the implementation of the mineralogical database, GMINER ( Nickovic et al. , 2012 ), together with a specific set of physical parameterizations in the model's mineral dust emission module, which led to a general improvement of the model performance when comparing the simulated mineral dust aerosols with measurements over the Sahara region for January–February 2022. The simulated mineral dust aerosol vertical distribution is tested by a comparison with aerosol lidar measurements from the lidar system Polly XT , located at Cape Verde. For a lofted mineral dust aerosol layer on 2 February at 05:00 UTC the lidar retrievals yield a dust mass concentration peak of 156 µg m −3 , while the model calculates the mineral dust peak at 136 µg m −3 . The results highlight the possibility of using the model with resolved mineral dust composition for interpretation of the lidar measurements since a higher absorption in the UV–Vis wavelengths is correlated with particles having a higher hematite content. Additionally, the comparison with in situ mineralogical measurements of dust aerosol particles shows that more of them are needed for model evaluation.
Subject code	333
Language	English
Publishing date	2024-02-14
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: The implementation of dust mineralogy in COSMO5.05-MUSCAT

eISSN: 1991-9603

2024

Abstract	Mineral dust aerosols are composed of a complex assemblage of various minerals depending on the region in which they originated. Given the different mineral composition of desert dust aerosols, different physicochemical properties and therefore varying climate effects are expected. Despite the known regional variations in mineral composition, chemical transport models typically assume that mineral dust aerosols have uniform composition. This study adds, for the first time, mineralogical information to the mineral dust emission scheme used in the chemical transport model COSMO–MUSCAT. We provide a detailed description of the implementation of the mineralogical database, GMINER ( Nickovic et al. , 2012 ), together with a specific set of physical parameterizations in the model's mineral dust emission module, which led to a general improvement of the model performance when comparing the simulated mineral dust aerosols with measurements over the Sahara region for January–February 2022. The simulated mineral dust aerosol vertical distribution is tested by a comparison with aerosol lidar measurements from the lidar system Polly XT , located at Cape Verde. For a lofted mineral dust aerosol layer on 2 February at 05:00 UTC the lidar retrievals yield a dust mass concentration peak of 156 µg m −3 , while the model calculates the mineral dust peak at 136 µg m −3 . The results highlight the possibility of using the model with resolved mineral dust composition for interpretation of the lidar measurements since a higher absorption in the UV–Vis wavelengths is correlated with particles having a higher hematite content. Additionally, the comparison with in situ mineralogical measurements of dust aerosol particles shows that more of them are needed for model evaluation.
Subject code	333
Language	English
Publishing date	2024-02-14
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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