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Origin of Harmattan dust settled in Northern Ghana - Long transported or local dust?

Lyngsie, G. LU ; Awadzi, T. and Breuning-Madsen, H. (2011) In Geoderma 167-168. p.351-359
Abstract

The Harmattan is a dry, dust-laden continental wind which has its origin in the Bodélé Depression in the Chad basin. In Ghana the Harmattan can be experienced from November to March, when the Harmattan replaces the dominant south westerly maritime Monsoon wind. The hypothesis of this study is that the majority of dust deposited in northern Ghana may not be from the original Harmattan source in the Bodélé Depression. The aim of this study is therefore to investigate the origin of deposited dust in Tamale, Ghana. This is examined by comparing wind data, grain size distribution, mineralogical and geochemical data from dust samples deposited during the Harmattan and Monsoon seasons, and topsoil. This study shows that despite a clear... (More)

The Harmattan is a dry, dust-laden continental wind which has its origin in the Bodélé Depression in the Chad basin. In Ghana the Harmattan can be experienced from November to March, when the Harmattan replaces the dominant south westerly maritime Monsoon wind. The hypothesis of this study is that the majority of dust deposited in northern Ghana may not be from the original Harmattan source in the Bodélé Depression. The aim of this study is therefore to investigate the origin of deposited dust in Tamale, Ghana. This is examined by comparing wind data, grain size distribution, mineralogical and geochemical data from dust samples deposited during the Harmattan and Monsoon seasons, and topsoil. This study shows that despite a clear difference between the wind directions in the Harmattan and Monsoon seasons in Tamale, northern Ghana, no distinct differences are observed between the mineral or elemental compositions of the bulk dust samples. Traces of minerals in the clay fraction of the Harmattan period dust may have their origin in the Bodélé Depression or other saline environments. The Harmattan dust deposited in Ghana shows only little resemblance to dust from the Chad basin and with Harmattan dust deposited in Niger. This study therefore suggests that the dust deposited during the Harmattan period in northern Ghana is not under significant influence of sediments from the Bodélé Depression. Similarity in the mineral and elemental composition of the dust from both the Harmattan and Monsoon periods indicates that the dusts settled are mainly of local origin.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Elemental composition, Harmattan, Mineral dust, Mineralogy composition, West Africa
in
Geoderma
volume
167-168
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:81255134011
ISSN
0016-7061
DOI
10.1016/j.geoderma.2011.07.026
language
English
LU publication?
no
id
070dd009-55b0-4722-ba49-69f9ece8d00b
date added to LUP
2016-10-17 14:13:02
date last changed
2017-04-23 04:54:07
@article{070dd009-55b0-4722-ba49-69f9ece8d00b,
  abstract     = {<p>The Harmattan is a dry, dust-laden continental wind which has its origin in the Bodélé Depression in the Chad basin. In Ghana the Harmattan can be experienced from November to March, when the Harmattan replaces the dominant south westerly maritime Monsoon wind. The hypothesis of this study is that the majority of dust deposited in northern Ghana may not be from the original Harmattan source in the Bodélé Depression. The aim of this study is therefore to investigate the origin of deposited dust in Tamale, Ghana. This is examined by comparing wind data, grain size distribution, mineralogical and geochemical data from dust samples deposited during the Harmattan and Monsoon seasons, and topsoil. This study shows that despite a clear difference between the wind directions in the Harmattan and Monsoon seasons in Tamale, northern Ghana, no distinct differences are observed between the mineral or elemental compositions of the bulk dust samples. Traces of minerals in the clay fraction of the Harmattan period dust may have their origin in the Bodélé Depression or other saline environments. The Harmattan dust deposited in Ghana shows only little resemblance to dust from the Chad basin and with Harmattan dust deposited in Niger. This study therefore suggests that the dust deposited during the Harmattan period in northern Ghana is not under significant influence of sediments from the Bodélé Depression. Similarity in the mineral and elemental composition of the dust from both the Harmattan and Monsoon periods indicates that the dusts settled are mainly of local origin.</p>},
  author       = {Lyngsie, G. and Awadzi, T. and Breuning-Madsen, H.},
  issn         = {0016-7061},
  keyword      = {Elemental composition,Harmattan,Mineral dust,Mineralogy composition,West Africa},
  language     = {eng},
  pages        = {351--359},
  publisher    = {Elsevier},
  series       = {Geoderma},
  title        = {Origin of Harmattan dust settled in Northern Ghana - Long transported or local dust?},
  url          = {http://dx.doi.org/10.1016/j.geoderma.2011.07.026},
  volume       = {167-168},
  year         = {2011},
}