Vertical Variability in morphology, chemistry and optical properties of the transported Saharan air layer measured from Cape Verde and the Caribbean

Autor(en)

Sudharaj Aryasree, Konrad Kandler, Natalie Benker, Adrian Walser, Anne Tipka, Maximillian Dollner, Petra Seibert, Bernadett Weinzierl

Abstrakt

The structural properties of the Saharan air layer (SAL) including chemical, morphological and optical properties were measured during the Saharan Aerosol Longrange TRansport and Aerosol Cloud interaction Experiment (SALTRACE- June/July 2013). Flight measurements were done from Cape Verde and the Caribbean. Changes happening with the chemical composition, mixing, shape and absorption of aerosol single particles (particle diameter range 0.5–3.0 µm) inside SAL during its transport are detailed. Dust-dominated SAL (relative number abundance gt;90 and generally low mixing (lt;1salt and sulphates) are observed at both locations. The change in shape (determined as aspect ratio (AR)) after transatlantic transport was statistically not significant. The iron oxide fraction, important for light absorption, contributed 6.0–6.8 especially for the size range 0.5–1.5 µm. This reduction in Fe oxide content resulted in a 40.0046–0.0044) in dust imaginary refractive index and a 10.802–0.809) at 520 nm. Our work suggests including the size distribution of iron oxides and their particular behaviour in future experiment/model studies.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Technische Universität Darmstadt, Dynamic Biosensors GmbH, Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) , Universität Wien, Universität für Bodenkultur Wien

Journal

Royal Society Open Science

Band

11

Anzahl der Seiten

29

ISSN

2054-5703

DOI

https://doi.org/10.1098/rsos.231433

Publikationsdatum

11-2024

Peer-reviewed

Ja

ÖFOS 2012

103039 Aerosolphysik, 103037 Umweltphysik, 105204 Klimatologie

Schlagwörter

ASJC Scopus Sachgebiete

General

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5a36739b-cd36-415c-9894-8bf555b48349