Variability of ambient particulate matter loading at Henties Bay, Namibia

Authors

  • Monray D Belelie Unit for Environmental Sciences and Management, North-West University, Potchefstroom
  • Henno Havenga Unit for Environmental Sciences and Management, North-West University, Potchefstroom 2520, South Africa https://orcid.org/0000-0002-9238-0295
  • Danitza Klopper Department of Geography and Environmental Sciences, School of Agricultural and Environmental Sciences, University of Limpopo, Mankweng https://orcid.org/0000-0002-4286-8647
  • Rebecca M Garland Department of Geography, Geo-informatics and Meteorology, University of Pretoria, Pretoria; Smart Places, Council for Scientific and Industrial Research, Pretoria https://orcid.org/0000-0002-1855-8622
  • Brigitte Language Unit for Environmental Sciences and Management, North-West University, Potchefstroom; Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR CNRS, Université Paris-Est Créteil, Université de Paris, Institut Pierre Simon Laplace, Créteil, France https://orcid.org/0000-0002-9942-7930
  • Paola Formenti Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR CNRS, Université Paris-Est Créteil, Université de Paris, Institut Pierre Simon Laplace, Créteil, France
  • Andreas Namwoonde Sam Nujoma Marine and Coastal Resources Research Centre, Sam Nujoma Campus, University of Namibia, Henties Bay, Namibia https://orcid.org/0000-0003-1209-2574
  • Roelof P Burger Unit for Environmental Sciences and Management, North-West University, Potchefstroom https://orcid.org/0000-0002-4359-4588
  • Stuart J Piketh Unit for Environmental Sciences and Management, North-West University, Potchefstroom https://orcid.org/0000-0002-2804-879X

DOI:

https://doi.org/10.17159/caj/2023/33/2.16670

Keywords:

PM, stratocumulus cloud, HYSPLIT, HAEs, LAEs

Abstract

The Namibian coast is one of the areas of international interest for aerosol studies. This is due to the region’s importance for the global radiation budget because of the presence of a semi-permanent stratocumulus cloud along the coast. Aerosol particles may scatter/absorb radiation and directly influence how long clouds last by modifying their properties. This is all dependent on the particles’ chemical and physical properties because of the sources they were emitted from. In this study, we identified and investigated episodes of high (HAE) and low (LAE) PM concentrations and the meteorology that may favour their occurrence. Here, we investigated PM2.5 (particles with an aerodynamic diameter of 2.5 µm or less) and PM10 (particles with an aerodynamic diameter of 10 µm or less) at Henties Bay, Namibia. Daily aerosol measurements were taken with E-samplers between 15 and 29 July 2019. The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model was used to investigate the long-range atmospheric transport of air masses that reached Henties Bay. The study found that during HAEs, the average PM2.5 concentration was 28.40 ± 18.10 µg/m3 and the average PM10 concentration was 68.20 ± 44.3 µg/m3. In contrast, during LAEs, the average PM2.5 concentration was 13.3 ± 9.52 µg/m3 and the average PM10 concentration was 30.00 ± 23.00 µg/m3. In both fractions, there was an observed dominant contribution from marine sources.

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Published

2023-12-21

How to Cite

Belelie, M. D., Havenga, H., Klopper, D., Garland, R. M., Language, B., Formenti, P., Namwoonde, A., Burger, R. P., & Piketh, S. J. (2023). Variability of ambient particulate matter loading at Henties Bay, Namibia. Clean Air Journal, 33(2). https://doi.org/10.17159/caj/2023/33/2.16670

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Section

Research Article

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