scholarly journals Properties of Saharan Dust versus Local Urban Dust – a case study.

2021 ◽  
Author(s):  
D. M. Szczepanik ◽  
I. S. Stachlewska ◽  
E. Tetoni ◽  
D. Althausen
Keyword(s):  
Saharan Dust ◽  
Urban Dust

scholarly journals The Potential of GRASP/GARRLiC Retrievals for Dust Aerosol Model Evaluation: Case Study during the PreTECT Campaign

2021 ◽  
Vol 13 (5) ◽  
pp. 873
Author(s):  
Dimitra Konsta ◽  
Alexandra Tsekeri ◽  
Stavros Solomos ◽  
Nikolaos Siomos ◽  
Anna Gialitaki ◽  
...  
Keyword(s):  
Model Evaluation ◽  
Dust Concentration ◽  
Saharan Dust ◽  
North Coast ◽  
Concentration Profiles ◽  
Future Studies ◽  
Aerosol Model ◽  
The North ◽  
Sun Photometer

We use the Generalized Retrieval of Aerosol Surface Properties algorithm (GRASP) to compare with dust concentration profiles derived from the NMME-DREAM model for a specific dust episode. The GRASP algorithm provides the possibility of deriving columnar and vertically-resolved aerosol properties from a combination of lidar and sun-photometer observations. Herein, we apply GRASP for analysis of a Saharan dust outburst observed during the “PREparatory: does dust TriboElectrification affect our ClimaTe” campaign (PreTECT) that took place at the North coast of Crete, at the Finokalia ACTRIS station. GRASP provides column-averaged and vertically resolved microphysical and optical properties of the particles. The retrieved dust concentration profiles are compared with modeled concentration profiles derived from the NMME-DREAM dust model. To strengthen the results, we use dust concentration profiles from the POlarization-LIdar PHOtometer Networking method (POLIPHON). A strong underestimation of the maximum dust concentration is observed from the NMME-DREAM model. The reported differences between the retrievals and the model indicate a high potential of the GRASP algorithm for future studies of dust model evaluation.

scholarly journals Synergetic monitoring of Saharan dust plumes and potential impact on surface: a case study of dust transport from Canary Islands to Iberian Peninsula

2011 ◽  
Vol 11 (7) ◽  
pp. 3067-3091 ◽  
Author(s):  
C. Córdoba-Jabonero ◽  
M. Sorribas ◽  
J. L. Guerrero-Rascado ◽  
J. A. Adame ◽  
Y. Hernández ◽  
...  
Keyword(s):  
Iberian Peninsula ◽  
Particle Deposition ◽  
Ground Level ◽  
In Situ Measurements ◽  
Saharan Dust ◽  
Dust Transport ◽  
Air Masses ◽  
Potential Impact

Abstract. The synergetic use of meteorological information, remote sensing both ground-based active (lidar) and passive (sun-photometry) techniques together with backtrajectory analysis and in-situ measurements is devoted to the characterization of dust intrusions. A case study of air masses advected from the Saharan region to the Canary Islands and the Iberian Peninsula, located relatively close and far away from the dust sources, respectively, was considered for this purpose. The observations were performed over three Spanish geographically strategic stations within the dust-influenced area along a common dust plume pathway monitored from 11 to 19 of March 2008. A 4-day long dust event (13–16 March) over the Santa Cruz de Tenerife Observatory (SCO), and a linked short 1-day dust episode (14 March) in the Southern Iberian Peninsula over the Atmospheric Sounding Station "El Arenosillo" (ARN) and the Granada station (GRA) were detected. Meteorological conditions favoured the dust plume transport over the area under study. Backtrajectory analysis clearly revealed the Saharan region as the source of the dust intrusion. Under the Saharan air masses influence, AERONET Aerosol Optical Depth at 500 nm (AOD500) ranged from 0.3 to 0.6 and Ångström Exponent at 440/675 nm wavelength pair (AE440/675) was lower than 0.5, indicating a high loading and predominance of coarse particles during those dusty events. Lidar observations characterized their vertical layering structure, identifying different aerosol contributions depending on altitude. In particular, the 3-km height dust layer transported from the Saharan region and observed over SCO site was later on detected at ARN and GRA stations. No significant differences were found in the lidar (extinction-to-backscatter) ratio (LR) estimation for that dust plume over all stations when a suitable aerosol scenario for lidar data retrieval is selected. Lidar-retrieved LR values of 60–70 sr were obtained during the main dust episodes. These similar LR values found in all the stations suggest that dust properties were kept nearly unchanged in the course of its medium-range transport. In addition, the potential impact on surface of that Saharan dust intrusion over the Iberian Peninsula was evaluated by means of ground-level in-situ measurements for particle deposition assessment together with backtrajectory analysis. However, no connection between those dust plumes and the particle sedimentation registered at ground level is found. Differences on particle deposition processes observed in both Southern Iberian Peninsula sites are due to the particular dust transport pattern occurred over each station. Discrepancies between columnar-integrated and ground-level in-situ measurements show a clear dependence on height of the dust particle size distribution. Then, further vertical size-resolved observations are needed for evaluation of the impact on surface of the Saharan dust arrival to the Iberian Peninsula.

scholarly journals Transport of Saharan dust from the Bodélé Depression to the Amazon Basin: a case study

2010 ◽  
Vol 10 (2) ◽  
pp. 4345-4372 ◽  
Author(s):  
Y. Ben-Ami ◽  
I. Koren ◽  
Y. Rudich ◽  
P. Artaxo ◽  
S. T. Martin ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Amazon Basin ◽  
Marine Boundary Layer ◽  
Average Concentration ◽  
Saharan Dust ◽  
Aerosol Layer ◽  
Amazon Forest ◽  
Close Link ◽  
Bodele Depression

Abstract. Through long-range transport of dust, the Sahara desert supplies essential minerals to the Amazon rain forest. Since Saharan dust reaches South America mostly during the Northern Hemisphere winter, the dust sources active during winter are the main contributors to the forest. Given that the Bodélé depression area in Southwestern Chad is the main winter dust source, a close link is expected between the Bodélé emission patterns and volumes and the mineral supply flux to the Amazon. Until now, the particular link between the Bodélé and the Amazon forest was based on sparse satellite measurements and modeling studies. In this study, we combine a detailed analysis of space-borne and ground data with reanalysis model data and surface measurements taken in the Central Amazon during the Amazonian Aerosol Characterization Experiment (AMAZE-08) in order to explore the validity and the nature of the proposed link between the Bodélé depression and the Amazon forest. This case study follows the dust events of 11–16 and 18–27 February 2008, from the emission in the Bodélé over West Africa, the crossing of the Atlantic Ocean, to the observed effects above the Amazon canopy about 10 days after the emission. The dust was lifted by surface winds stronger than 14 m s−1, usually starting early in the morning. The lofted dust mixed with biomass burning aerosols over Nigeria, was transported over the Atlantic Ocean, and arrived over the South American continent. The top of the aerosol layer reached above 3 km, and the bottom merged with the marine boundary layer. The arrival of the dusty air parcel over the Amazon forest increased the average concentration of aerosol crustal elements by an order of magnitude.

A Case Study of Mobilization and Transport of Saharan Dust

1988 ◽  
Vol 45 (15) ◽  
pp. 2145-2175 ◽  
Author(s):  
Douglas L. Westphal ◽  
Owen B. Toon ◽  
Toby N. Carlson
Keyword(s):  
Saharan Dust

Heavy metals in urban dust: contamination and health risk assessment: a case study from Gyumri, Armenia

2016 ◽  
Vol 9 (2) ◽  
Author(s):  
Lilit Sahakyan ◽  
Nairuhi Maghakyan ◽  
Olga Belyaeva ◽  
Gevorg Tepanosyan ◽  
Mkhitar Kafyan ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Health Risk ◽  
Health Risk Assessment ◽  
Urban Dust

Mineral dust aerosol from Saharan desert by means of atmospheric, emission, dispersion modelling

2011 ◽  
Vol 8 (4) ◽  
pp. 7313-7338 ◽  
Author(s):  
F. Guarnieri ◽  
F. Calastrini ◽  
C. Busillo ◽  
M. Pasqui ◽  
S. Becagli ◽  
...  
Keyword(s):  
Prediction Models ◽  
Mineral Dust ◽  
Dust Emission ◽  
Atmospheric Model ◽  
Saharan Dust ◽  
Emission Model ◽  
Good Correspondence ◽  
Comparison Of The Results ◽  
Modelling System

Abstract. The application of Numerical Prediction Models to mineral dust cycle is considered of prime importance for the investigation of aerosol and non-CO2 greenhouse gases contributions in climate variability and change. In this framework, a modelling system was developed in order to provide a regional characterization of Saharan dust intrusions over Mediterranean basin. The model chain is based on three different modules: the atmospheric model, the dust emission model and transport/deposition model. Numerical simulations for a selected case study, June 2006, were performed in order to evaluate the modelling system effectiveness. The comparison of the results obtained in such a case study shows a good agreement with those coming from GOCART model. Moreover a good correspondence was found in the comparison with in-situ measurements regarding some specific crustal markers in the PM10 fraction.

scholarly journals CALIPSO lidar observations of the optical properties of Saharan dust: A case study of long-range transport

2008 ◽  
Vol 113 (D7) ◽  
Author(s):  
Zhaoyan Liu ◽  
Ali Omar ◽  
Mark Vaughan ◽  
Johnathan Hair ◽  
Chieko Kittaka ◽  
...  
Keyword(s):  
Optical Properties ◽  
Long Range ◽  
Saharan Dust ◽  
Long Range Transport ◽  
Range Transport ◽  
Lidar Observations

Urban dust in the Guanzhong basin of China, part II: A case study of urban dust pollution using the WRF-Dust model

2016 ◽  
Vol 541 ◽  
pp. 1614-1624 ◽  
Author(s):  
Nan Li ◽  
Xin Long ◽  
Xuexi Tie ◽  
Junji Cao ◽  
Rujin Huang ◽  
...  
Keyword(s):  
Urban Dust ◽  
Dust Pollution ◽  
Guanzhong Basin
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