Abstract：
:Variability in levels and sources of polycyclic aromatic hydrocarbons (PAH) in sediments from one large sea area off the coast of northern Norway ("North area", NA) have been compared to similar data from another large area off the coast of southern Norway ("South area", SA). Samples from NA were collected at the Norwegian continental shelf in south-western Barents Sea and north-eastern Norwegian Sea. Samples from SA were from the Norwegian Trench and the Skagerrak. Sediment cores have been dated, characterised by grain size distribution (GS) and organic carbon content (TOC), and the composition of PAH and geochemical biomarkers (alkanes and triterpanes) studied to provide an insight into the different sources of PAH. Generally, PAH levels are higher in sediments from SA compared to NA. A mixture of pyrogenic and petrogenic sources contribute to PAH levels in SA, while the contents of petrogenic PAH is negligible in surface sediments in NA. At some locations in NA, petrogenic PAH levels are elevated in the deepest sediment layers from pre-industrial times, indicating a natural input of petroleum through seepage. Occurrence of elevated levels of microbial hopanoids (hopenes) in the deepest sediment layers at some locations both in the north and the south indicate the presence of petroleum.
journal_name
Mar Environ Resjournal_title
Marine environmental researchauthors
Boitsov S,Petrova V,Jensen HK,Kursheva A,Litvinenko I,Klungsøyr Jdoi
10.1016/j.marenvres.2013.03.006subject
Has Abstractpub_date
2013-06-01 00:00:00pages
73-84eissn
0141-1136issn
1879-0291pii
S0141-1136(13)00051-2journal_volume
87-88pub_type
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