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Urlaub, Morelia; Schmidt-Aursch, Mechita; Jokat, Wilfried; Kaul, Norbert E (2017): Heat flow data during POLARSTERN cruise ARK-XVII/2, AMORE expedition to the Gakkel Ridge, with links to raw data files. PANGAEA,, Supplement to: Urlaub, M et al. (2009): Gravity crustal models and heat flow measurements for the Eurasia Basin, Arctic Ocean. Marine Geophysical Research, 30(4), 277-292,

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The Gakkel Ridge in the Arctic Ocean with its adjacent Nansen and Amundsen Basins is a key region for the study of mantle melting and crustal generation at ultraslow spreading rates. We use free-air gravity anomalies in combination with seismic reflection and wide-angle data to compute 2-D crustal models for the Nansen and Amundsen Basins in the Arctic Ocean. Despite the permanent pack-ice cover two geophysical transects cross both entire basins. This means that the complete basin geometry of the world's slowest spreading system can be analysed in detail for the first time. Applying standard densities for the sediments and oceanic crystalline crust, the gravity models reveal an unexpected heterogeneous mantle with densities of 3.30 × 10³, 3.20 × 10³ and 3.10 × 10³ kg/m³ near the Gakkel Ridge. We interpret that the upper mantle heterogeneity mainly results from serpentinisation and thermal effects. The thickness of the oceanic crust is highly variable throughout both transects. Crustal thickness of less than 1 km dominates in the oldest parts of both basins, increasing to a maximum value of 6 km near the Gakkel Ridge. Along-axis heat flow is highly variable and heat flow amplitudes resemble those observed at fast or intermediate spreading ridges. Unexpectedly, high heat flow along the Amundsen transect exceeds predicted values from global cooling curves by more than 100%.
Median Latitude: 86.524261 * Median Longitude: 61.809569 * South-bound Latitude: 82.911800 * West-bound Longitude: -6.321600 * North-bound Latitude: 89.013600 * East-bound Longitude: 130.152500
Date/Time Start: 2001-08-09T02:20:00 * Date/Time End: 2001-09-20T11:20:00
Minimum Elevation: -5376.0 m * Maximum Elevation: -2906.0 m
PS59/207-1b * Latitude Start: 84.646667 * Longitude Start: 5.185000 * Latitude End: 84.646667 * Longitude End: 5.215000 * Date/Time Start: 2001-08-09T02:20:00 * Date/Time End: 2001-08-09T03:10:00 * Elevation Start: -2970.0 m * Elevation End: -2906.0 m * Campaign: ARK-XVII/2 (PS59 AMORE) * Basis: Polarstern * Device: Heat-Flow probe (HF)
PS59/217-1b * Latitude Start: 83.143333 * Longitude Start: -4.841667 * Latitude End: 83.143333 * Longitude End: -4.845000 * Date/Time Start: 2001-08-12T21:04:00 * Date/Time End: 2001-08-12T21:54:00 * Elevation Start: -3683.0 m * Elevation End: -3739.0 m * Campaign: ARK-XVII/2 (PS59 AMORE) * Basis: Polarstern * Device: Heat-Flow probe (HF)
PS59/219-3a * Latitude Start: 82.911667 * Longitude Start: -6.321667 * Latitude End: 82.911667 * Longitude End: -6.328333 * Date/Time Start: 2001-08-13T22:23:00 * Date/Time End: 2001-08-13T23:25:00 * Elevation Start: -4165.0 m * Elevation End: -4165.0 m * Campaign: ARK-XVII/2 (PS59 AMORE) * Basis: Polarstern * Device: Heat-Flow probe (HF)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventKaul, Norbert E
2Station labelStationKaul, Norbert EHF-Station
3Date/Time of eventDate/TimeKaul, Norbert E
4Conductivity, thermalkW/m/KKaul, Norbert E
5Temperature gradientT gradmK/mKaul, Norbert E
6Heat FlowHFmW/m2Kaul, Norbert E
7Bottom water temperatureBWT°CKaul, Norbert E
8Depth, shiftDepth shiftmKaul, Norbert E
9Depth, bathymetricBathy depthmKaul, Norbert E
10LATITUDELatitudeKaul, Norbert EGeocode
11LONGITUDELongitudeKaul, Norbert EGeocode
12File sizeFile sizekByteKaul, Norbert E
13Uniform resource locator/link to raw data fileURL rawKaul, Norbert E
306 data points

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