Citation:

PANGAEA.971520 (dataset in review)

Name: Concentrations and loadings of alkanes in surface sediments of Helgoland Mud Area in the North Sea
License: https://creativecommons.org/licenses/by/4.0/
Keywords: alkanes; Carbon Burial; Helgoland mud area; North Sea

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Abstract:

Surface sediment were extracted 4 times by ultrasonication with dichloromethane: methanol (9:1, v/v) for 15 min for FAs and alkanes. For quantification of FAs and alkanes, known amounts of 19-methylarachidic acid and squalane were added as internal standards prior to extraction. Supernatants from each extraction were obtained by centrifugation and combined. The total lipid extracts were concentrated and evaporated under a nitrogen stream. The total lipid extracts were saponified for 2 h at 80 °C with 1 mL of KOH (0.1 M) in methanol: H2O (9:1, v/v). After saponification, the neutral fractions were liquid-liquid extracted with n-hexane and alkanes were eluted from the neutral fractions by silica gel column chromatography with n-hexane. The remaining KOH solution was acidified to pH 1, from which FA were liquid-liquid extracted into dichloromethane. The extracted and dried FAs were converted to methyl ester derivatives (FAMEs) in methanol: HCl (95:5, v/v) at 60 °C for 12 h. After methylation, the FAME fraction was further purified by silica gel column chromatography using dichloromethane: hexane (2:1, v/v) to remove residual polar compounds.

FAMEs and alkanes were analyzed on a 7890A gas chromatograph (GC) equipped with a DB-5MS fused silica capillary column (60 m, 250 µm, 0.25 µm) and a flame ionization detector (FID). Peak areas were determined by integrating the respective peaks and concentrations were calculated against the internal standards. FAME contents were subsequently corrected for the derivative methyl carbon to determine FA contents. FAs and alkanes were normalized to OC content.

Keyword(s):

alkanes; Carbon Burial; Helgoland mud area; North Sea

Project(s):

Anthropogenic impacts on particulate organic carbon cycling in the North Sea (APOC)

Funding:

Federal Ministry of Education and Research (BMBF), grant/award no. 03F0874D : Ozeane unter Stress: APOC - Anthropogene Einflüsse auf den Kreislauf partikulären organischen Kohlenstoffs in der Nordsee

German Research Foundation (DFG), grant/award no. 390741603 : EXC 2077: The Ocean Floor – Earth's Uncharted Interface

Coverage:

Median Latitude: 54.068525 * Median Longitude: 8.152558 * South-bound Latitude: 53.898300 * West-bound Longitude: 7.919804 * North-bound Latitude: 54.230000 * East-bound Longitude: 8.707200

Date/Time Start: 2022-03-17T13:11:45 * Date/Time End: 2022-03-30T16:07:52

Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 0.01 m

Event(s):

HE595_1-3 * Latitude: 54.134669 * Longitude: 8.019095 * Date/Time: 2022-03-17T13:11:45 * Elevation: -26.0 m * Location: North Sea * Campaign: (CYPOC) * Basis: * Method/Device: MultiCorer (MUC)

HE595_6-1 * Latitude: 54.088596 * Longitude: 8.026592 * Date/Time: 2022-03-18T11:00:00 * Elevation: -25.6 m * Location: North Sea * Campaign: (CYPOC) * Basis: * Method/Device: MultiCorer (MUC)

HE595_9-1 * Latitude: 54.095192 * Longitude: 8.073844 * Date/Time: 2022-03-19T08:51:47 * Elevation: -20.0 m * Location: North Sea * Campaign: (CYPOC) * Basis: * Method/Device: MultiCorer (MUC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Wei, Bingbing		Station number
2	LATITUDE	Latitude		Wei, Bingbing		Geocode
3	LONGITUDE	Longitude		Wei, Bingbing		Geocode
4	DEPTH, sediment/rock	Depth sed	m	Wei, Bingbing		Geocode
5	Depth, top/min	Depth top	m	Wei, Bingbing
6	Depth, bottom/max	Depth bot	m	Wei, Bingbing
7	n-Alkane C14, per unit mass total organic carbon	C14/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
8	n-Alkane C15, per unit mass total organic carbon	C15/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
9	n-Alkane C16, per unit mass total organic carbon	C16/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
10	n-Alkane C17, per unit mass total organic carbon	C17/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
11	Pristane, per unit mass total organic carbon	Pr/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
12	n-Alkane C18, per unit mass total organic carbon	C18/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
13	Phytane, per unit mass total organic carbon	Phy/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
14	n-Alkane C19, per unit mass total organic carbon	C19/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
15	n-Alkane C20, per unit mass total organic carbon	C20/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
16	n-Alkane C21, per unit mass total organic carbon	C21/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
17	n-Alkane C22, per unit mass total organic carbon	C22/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
18	n-Alkane C23, per unit mass total organic carbon	C23/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
19	n-Alkane C24, per unit mass total organic carbon	C24/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
20	n-Alkane C25, per unit mass total organic carbon	C25/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
21	n-Alkane C26, per unit mass total organic carbon	C26/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
22	n-Alkane C27, per unit mass total organic carbon	C27/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
23	n-Alkane C28, per unit mass total organic carbon	C28/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
24	n-Alkane C29, per unit mass total organic carbon	C29/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
25	n-Alkane C30, per unit mass total organic carbon	C30/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
26	n-Alkane C31, per unit mass total organic carbon	C31/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
27	n-Alkane C32, per unit mass total organic carbon	C32/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
28	n-Alkane C33, per unit mass total organic carbon	C33/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
29	n-Alkane C34, per unit mass total organic carbon	C34/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
30	n-Alkane C35, per unit mass total organic carbon	C35/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
31	n-Alkane C36, per unit mass total organic carbon	C36/TOC	µg/g	Wei, Bingbing	Gas chromatograph, Agilent, 7890A; with flame ionization detection (FID)
32	n-Alkane, sum, per unit mass total organic carbon	n-A sum/TOC	µg/g	Wei, Bingbing
33	n-Alkane C27+C29+C31+C35 per unit mass total organic carbon	n-Alka C27+C29+C31+C35/TOC	µg/g	Wei, Bingbing
34	n-Alkane C26+C28+C30+C32 per unit mass total organic carbon	n-Alka C26+C28+C30+C32/TOC	µg/g	Wei, Bingbing
35	n-Alkane C27+C29+C31+C35 loading	n-Alka C27+C29+C31+C35 loading	µg/m²	Wei, Bingbing
36	n-Alkane C26+C28+C30+C32 loading	n-Alka C26+C28+C30+C32 loading	µg/m²	Wei, Bingbing

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

992 data points

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