Citation:

j.gca.2011.02.011

Name: (Appendix A) Dissolved manganese concentrations during POLARSTERN Cruise ARK-XXII/2
Published: 2011
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

A total of 773 samples were analysed for dissolved manganese (Mn) in the Arctic Ocean aboard R.V. Polarstern during expedition ARK XXII/2 from 28 July until 07 October 2007 from Tromsø (Norway) to Bremerhaven. Concentrations of Mn were elevated in the surface layer with concentrations of up to 6 nM over the deep Basins and over 20 nM in the Laptev Sea. The general distribution of Mn through the water column is consistent with previous studies, but there are differences in the absolute concentrations that are most likely related to differences in sample area, sampling and filtration.

The elevated concentrations of Mn in the surface layer are related to fresh water input. This was visible in the strong negative correlations observed between dissolved Mn and salinity. The correlation between Mn and salinity and the correlation between Mn and the quasi conservative trace water mass tracer PO4*, showed fluvial and melt water input and the Pacific and Atlantic origin of the surface waters. A large portion of the Mn delivered by the Arctic rivers is removed in the shelf seas and does not pass into the central basins. Most likely a benthic flux is at the origin of the elevated concentrations of Mn near the sediments in the Barents and Kara Seas. These elevated concentrations of Mn apparently affected the deep basins as well, as maxima in the concentrations of Mn were observed that corresponded with lowered transmission over the continental slope.

A maximum in the concentration of Mn in the deep basin corresponded with anomalies in light transmission, potential temperature and dissolved iron, confirming the hydrothermal origin. The hydrothermal plume was observed throughout the Nansen Basin and over the deep Gakkel Ridge around 2500 m depth and a smaller plume was observed around 3200 m. The concentration of Mn at the Mn maximum around 2500 m depth decreased exponentially, consistent with a first order scavenging model. The concentrations of Mn were extremely low in the deep Makarov Basin (~0.05 nM) and slightly higher in the Eurasian Basin (~0.1 nM) outside the influence of the hydrothermal activity.

Project(s):

Global marine biogeochemical cycles of trace elements and their isotopes (GEOTRACES)

International Polar Year (2007-2008) (IPY)

Coverage:

Median Latitude: 83.228704 * Median Longitude: 103.793227 * South-bound Latitude: 75.000500 * West-bound Longitude: 33.950100 * North-bound Latitude: 88.667500 * East-bound Longitude: -135.034800

Date/Time Start: 2007-07-30T10:11:00 * Date/Time End: 2007-09-23T22:36:00

Minimum DEPTH, water: -0.8 m * Maximum DEPTH, water: 5200.6 m

Event(s):

PS70/228-1 * Latitude: 75.000500 * Longitude: 34.000000 * Date/Time: 2007-07-30T10:14:00 * Elevation: -178.0 m * Location: Arctic Ocean * Campaign: (PS70 SPACE DAMOCLES) * Basis: * Method/Device: (CTD-UC)

PS70/236-1 * Latitude: 77.500800 * Longitude: 33.986600 * Date/Time: 2007-07-31T07:47:00 * Elevation: -190.0 m * Location: Arctic Ocean * Campaign: (PS70 SPACE DAMOCLES) * Basis: * Method/Device: (CTD-UC)

PS70/237-1 * Latitude: 78.997200 * Longitude: 33.989800 * Date/Time: 2007-07-31T18:35:00 * Elevation: -275.0 m * Location: Arctic Ocean * Campaign: (PS70 SPACE DAMOCLES) * Basis: * Method/Device: (CTD-UC)

Comment:

Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	DATE/TIME	Date/Time			Geocode
5	Bottle number	Bottle		Middag, Rob
6	Elevation of event	Elevation	m
7	DEPTH, water	Depth water	m		Geocode
8	Manganese, dissolved	Mn diss	nmol/l	Middag, Rob
9	Quality flag	QF		Middag, Rob	4 = suspected outlier, 5 = out of range, 8 = GO-FlO closed at the wrong depth
10	Manganese, standard deviation	Mn std dev	±	Middag, Rob

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

2979 data points

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