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Profiles of cloud condensation nuclei, dust mass concentration, and ice-nucleating-particle-relevant aerosol properties in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements

Haarig, Moritz and Walser, Adrian and Ansmann, Albert and Dollner, Maximilian and Althausen, Dietrich and Sauer, Daniel and Farrell, David and Weinzierl, Bernadett (2019) Profiles of cloud condensation nuclei, dust mass concentration, and ice-nucleating-particle-relevant aerosol properties in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements. Atmospheric Chemistry and Physics (ACP) (19), pp. 13773-13788. Copernicus Publications. DOI: 10.5194/acp-2019-466 ISSN 1680-7316

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Official URL: https://doi.org/10.5194/acp-19-13773-2019

Abstract

The present study aims to evaluate lidar retrievals of cloud-relevant aerosol properties by using polarization lidar and coincident airborne in situ measurements in the Saharan Air Layer (SAL) over the Barbados region. Vertical profiles of the number concentration of cloud condensation nuclei (CCN), large particles (diameter d>500 nm), surface area, mass, and ice-nucleating particle (INP) concentration are derived from the lidar measurements and compared with CCN concentrations and the INP-relevant aerosol properties measured in situ with aircraft. The measurements were performed in the framework of the Saharan Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE) in summer 2013. The CCN number concentrations derived from lidar observations were up to a factor of 2 higher than the ones measured in situ aboard the research aircraft Falcon. Possible reasons for the difference are discussed. The number concentration of particles with a dry radius of more than 250 nm and the surface-area concentration obtained from the lidar observations and used as input for the INP parameterizations agreed well (<30 %-50 % deviation) with the aircraft measurements. In a pronounced lofted dust layer during summer (10 July 2013), the lidar retrieval yielded 100-300 CCN per cubic centimeter at 0.2 % water supersaturation and 10-200 INPs per liter at -25 C. Excellent agreement was also obtained in the comparison of mass concentration profiles. During the SALTRACE winter campaign (March 2014), the dust layer from Africa was mixed with smoke particles which dominated the CCN number concentration. This example highlights the unique lidar potential to separate smoke and dust contributions to the CCN reservoir and thus to identify the sensitive role of smoke in trade wind cumuli developments over the tropical Atlantic during the winter season.

Item URL in elib:https://elib.dlr.de/129710/
Document Type:Article
Title:Profiles of cloud condensation nuclei, dust mass concentration, and ice-nucleating-particle-relevant aerosol properties in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haarig, MoritzLeibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germanyhttps://orcid.org/0000-0002-5533-2112
Walser, AdrianFaculty of Physics, University of Vienna, Vienna, Austriahttps://orcid.org/0000-0003-0175-8211
Ansmann, AlbertLeibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germanyhttps://orcid.org/0000-0002-9196-4969
Dollner, MaximilianFaculty of Physics, University of Vienna, Vienna, AustriaUNSPECIFIED
Althausen, DietrichLeibniz Institute for Tropospheric Research (TROPOS), Leipzig, GermanyUNSPECIFIED
Sauer, DanielDLR, IPAhttps://orcid.org/0000-0002-0317-5063
Farrell, DavidCaribbean Institute for Meteorology and Hydrology, Bridgetown, Barbadoshttps://orcid.org/0000-0003-0644-7164
Weinzierl, BernadettFaculty of Physics, University of Vienna, Vienna, Austriahttps://orcid.org/0000-0003-4555-5686
Date:18 November 2019
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.5194/acp-2019-466
Page Range:pp. 13773-13788
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:aerosol-cloud interaction, Saharan mineral dust, lidar, in-situ measurements
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 - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Sauer, Dr. Daniel
Deposited On:11 Nov 2019 07:16
Last Modified:20 Nov 2019 14:01

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