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Triple-wavelength depolarization-ratio profiling of Saharan dust over Barbados during SALTRACE in 2013 and 2014

Haarig, Moritz and Ansmann, Albert and Althausen, Dietrich and Klepel, André and Groß, Silke Martha and Freudenthaler, Volker and Toledano, Carlos and Mamouri, Rodanthi-Elisavet and Farrell, David and Prescod, Damien and Marinou, Eleni and Gasteiger, Josef and Engelmann, Ronny and Baars, Holger (2017) Triple-wavelength depolarization-ratio profiling of Saharan dust over Barbados during SALTRACE in 2013 and 2014. Atmospheric Chemistry and Physics, 17, pp. 10767-10794. Copernicus Publications. DOI: 10.5194/acp-2017-170 ISSN 1680-7316

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Official URL: https://www.atmos-chem-phys.net/17/10767/2017

Abstract

Triple-wavelength polarization lidar measurements in Saharan dust layers were performed at Barbados (13.1° N, 59.6° W), 5000–8000 km west of the Saharan dust sources, in the framework of the Saharan Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE-1, June–July 2013, SALTRACE-3, June–July 2014). Three case studies are discussed. High quality was achieved by comparing the dust linear depolarization ratio profiles measured at 355, 532, and 1064 nm with respective dual-wavelength (355, 532 nm) depolarization ratio profiles measured with a reference lidar. A unique case of long-range transported dust over more than 12 000 km is presented. Saharan dust plumes crossing Barbados were measured with an airborne triple-wavelength polarization lidar over Missouri in the midwestern United States 7 days later. Similar dust optical properties and depolarization features were observed over both sites indicating almost unchanged dust properties within this 1 week of travel from the Caribbean to the United States. The main results of the triple-wavelength polarization lidar observations in the Caribbean in the summer seasons of 2013 and 2014 are summarized. On average, the particle linear depolarization ratios for aged Saharan dust were found to be 0.252 ± 0.030 at 355 nm, 0.280 ± 0.020 at 532 nm, and 0.225 ± 0.022 at 1064 nm after approximately 1 week of transport over the tropical Atlantic. Based on published simulation studies we present an attempt to explain the spectral features of the depolarization ratio of irregularly shaped mineral dust particles, and conclude that most of the irregularly shaped coarse-mode dust particles (particles with diameters > 1 µm) have sizes around 1.5–2 µm. The SALTRACE results are also set into the context of the SAMUM-1 (Morocco, 2006) and SAMUM-2 (Cabo Verde, 2008) depolarization ratio studies. Again, only minor changes in the dust depolarization characteristics were observed on the way from the Saharan dust sources towards the Caribbean.

Item URL in elib:https://elib.dlr.de/117198/
Document Type:Article
Title:Triple-wavelength depolarization-ratio profiling of Saharan dust over Barbados during SALTRACE in 2013 and 2014
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haarig, MoritzTROPOS, LeipzigUNSPECIFIED
Ansmann, AlbertTROPOS, LeipzigUNSPECIFIED
Althausen, DietrichTROPOS, LeipzigUNSPECIFIED
Klepel, AndréTROPOS, LeipzigUNSPECIFIED
Groß, Silke MarthaDLR, IPAUNSPECIFIED
Freudenthaler, VolkerLMU, MünchenUNSPECIFIED
Toledano, CarlosUniv. de Valladolid, SpanienUNSPECIFIED
Mamouri, Rodanthi-ElisavetCyprus University of Technology, Limassol, ZypernUNSPECIFIED
Farrell, DavidCIMH, Brigetown, BarbadosUNSPECIFIED
Prescod, DamienCIMH, Brigetown, BarbadosUNSPECIFIED
Marinou, EleniNOA, Athen, GriechenlandUNSPECIFIED
Gasteiger, JosefLMU, München & Univ. Wien, ÖsterreichUNSPECIFIED
Engelmann, RonnyTROPOS, LeipzigUNSPECIFIED
Baars, HolgerTROPOS, LeipzigUNSPECIFIED
Date:2017
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:17
DOI :10.5194/acp-2017-170
Page Range:pp. 10767-10794
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:Lidar, Saharan dust
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Groß, Silke Martha
Deposited On:15 Dec 2017 11:38
Last Modified:02 May 2019 14:05

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