Issue |
E3S Web Conf.
Volume 575, 2024
Second Central Asian DUst Conference (CADUC-2 2024)
|
|
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Article Number | 03002 | |
Number of page(s) | 4 | |
Section | Atmospheric dust at sink regions | |
DOI | https://doi.org/10.1051/e3sconf/202457503002 | |
Published online | 11 October 2024 |
Using trace metals to quantify long-range transported Saharan dust in Houston, Texas
Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX 77843-3136, USA
* Corresponding author: chellam@tamu.edu
Every year, trade winds periodically transport Saharan-Sahelian dust westwards across the Atlantic Ocean towards North America during the months of May-September. These intercontinental events episodically increase airborne particulate matter (PM) concentrations in parts of Texas potentially endangering public health and compliance with National Ambient Air Quality Standards. This article reviews unique methods we developed to identify and quantify African dust episodes when superposed on industrial emissions in Houston, Texas. We measured ~50 elements in PM2.5 and PM10 including trace metals and used them as inputs to a receptor model. This approach accurately tracked foreign-born aeolian aerosols demonstrating the validity of our procedure, which uses rare earth elements and transition metals to discriminate local and distal sources of dust. Our procedures can be directly extended to discriminate and quantify Asian dust mixed with anthropogenic PM in population centres without loss of generality if unique geochemical signatures for source and sink regions can be established.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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