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Sources of Organic Tracers in Atmospheric Dust, Surface Seawater Particulate Matter and Sediment of the Red Sea

Citation

Rushdi, AI and Chase, Z and Simoneit, BRT and Paytan, A, Sources of Organic Tracers in Atmospheric Dust, Surface Seawater Particulate Matter and Sediment of the Red Sea, Oceanographic and Biological Aspects of the Red Sea, Springer Nature Switzerland, NMA Rasul, ICF Stewart (ed), Switzerland, pp. 75-88. ISBN 9783319994161 (2019) [Research Book Chapter]


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Official URL: https://link.springer.com/chapter/10.1007%2F978-3-...

DOI: doi:10.1007/978-3-319-99417-8_4

Abstract

This chapter discusses the various input sources of extractable organic matter (EOM) compounds to the Red Sea. These are based on geochemical analyses of atmospheric dust, surface seawater particulate matter and sediment samples collected from the Gulf of Aqaba and the coasts of the Gulf of Suez, Saudi Arabia and Yemen. The samples were extracted with a dichloromethane/methanol mixture and analyzed by gas chromatography-mass spectrometry (GC-MS). The EOM compounds (lipids) in the samples are diverse and include n-alkanes, n-alkanoic acids, n-alkanols, methyl n-alkanoates, steroids, petroleum hydrocarbons and plasticizers. The steroids and n-alkanoic acids were major components of the surface seawater particulate matter samples, whereas petroleum hydrocarbons were major compounds in coastal sediments. Based on the results of the different samples, the main input sources of these lipids were from: (1) natural autochthonous microbiota (plankton and bacteria) as indicated by the presence of cholesterol and brassicasterol in the different surface seawater particulate matter and sediment samples; (2) natural allochthonous material origins from terrestrial plant detritus transported by dust as shown by the distributions of n-alkanoic acids, n-alkanols and phytosterols; and (3) anthropogenic sources (mainly petroleum) from regional oil production activities, oil tankers or shipping activities as revealed by the n-alkane distribution pattern and the presence of an unresolved complex mixture (UCM) of branched and cyclic hydrocarbons, with hopane and sterane biomarkers. Future studies of the organic and inorganic biogeochemistry on the water column, coastal areas and dust transported to the Red Sea are needed to characterize the various regional sources, transformation, and diagenetic processes of the organic matter en route to this marine environment.

Item Details

Item Type:Research Book Chapter
Keywords:Red Sea, dust, sediment, organic compounds
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
UTAS Author:Chase, Z (Associate Professor Zanna Chase)
ID Code:130749
Year Published:2019
Deposited By:Oceans and Cryosphere
Deposited On:2019-02-11
Last Modified:2019-02-12
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