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Laukert, Georgi; Frank, Martin; Hathorne, Ed C; Krumpen, Thomas; Rabe, Ben; Bauch, Dorothea; Werner, Kirstin; Peeken, Ilka; Kassens, Heidemarie (2017): Tab. 1: Sampling date, location, ice thickness, salinity, Nd isotope compositions and REE concentrations for the sea-ice samples recovered during cruise PS80. PANGAEA,, Supplement to: Laukert, G et al. (2017): Pathways of Siberian freshwater and sea ice in the Arctic Ocean traced with radiogenic Neodymium isotopes and rare earth elements. Polarforschung, 87(1), 3-13,

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Freshwater and sea ice in the Arctic Ocean (AO) both respond to climate forcing but changes in their distribution may in turn also significantly affect Northern Hemisphere climate. The exact mechanisms controlling their transport are, however, still subject of ongoing research. Radiogenic neodymium (Nd) isotopes (expressed as eNd) and rare earth elements (REEs) have successfully been used to trace ocean circulation in the AO and can provide valuable information on the origin, transport and fate of Arctic freshwater and drifting sea ice. Here, we present first sea-ice data and discuss the applicability of these tracers to determine the pathways of Siberian freshwater and the source areas of Arctic sea ice within the Eurasian Basin. Freshwaters originating from various Siberian rivers are well mixed and diluted prior to their advection to the central AO and the Fram Strait, thereby inhibiting the assessment of the individual contributions of the different rivers for these regions. Recent investigations of seawater Nd isotope and REE distributions on the Siberian shelves now allow for a more detailed determination of the sources of transpolar freshwater transport, and suggest that freshwater from the Lena River can at least be qualitatively traced further away from the shelves. In addition, sea ice has the potential to preserve marine and riverine eNd and REE signatures of the Siberian shelf source waters transported across the AO to the Fram Strait thereby avoiding the effects of mixing. Here, we test this potential for the first time by comparing eNd and REE signatures determined from unfiltered but essentially sediment-free sea-ice samples recovered in the Eurasian Basin of the central AO in 2012 with corresponding signatures of surface seawater in the formation regions of the ice. The sampled sea ice is dominantly characterized by ?Nd values near -8, in agreement with the incorporation of radiogenic freshwater (eNd=-6) from the Yenisei and Ob rivers and its formation east of Vilkitsky Strait as identified by a backtracking approach based on satellite-derived ice drift and concentration data. The latter also indicates that sea ice with a less radiogenic eNd signature near -11 formed north of the Laptev Sea, in agreement with mixed contributions of radiogenic waters from the Kara Sea and northward flowing highly unradiogenic Lena River water (eNd<=-15). Compared to the REE concentrations in Siberian shelf waters, those in the sea ice are depleted, indicating rejection of REEs together with salt during sea-ice formation. Despite potential modifications during incorporation into sea ice, its REE distribution patterns indicate a predictable relationship to those of the source waters, thus in addition supporting preservation of at least some of the marine and riverine REE characteristics during sea-ice formation and transport.
Related to:
Laukert, Georgi; Frank, Martin; Bauch, Dorothea; Hathorne, Ed C; Rabe, Benjamin; von Appen, Wilken-Jon; Wegner, Carolyn; Zieringer, Moritz; Kassens, Heidemarie (2017): Analysis of Nd isotope, REE and oxygen isotope ratios on water samples across Fram Strait. PANGAEA,
Laukert, Georgi; Frank, Martin; Bauch, Dorothea; Hathorne, Ed C; Rabe, Benjamin; von Appen, Wilken-Jon; Wegner, Carolyn; Zieringer, Moritz; Kassens, Heidemarie (2017): Ocean circulation and freshwater pathways in the Arctic Mediterranean based on a combined Nd isotope, REE and oxygen isotope section across Fram Strait. Geochimica et Cosmochimica Acta, 202, 285-309,
Median Latitude: 84.893501 * Median Longitude: 102.236715 * South-bound Latitude: 82.670670 * West-bound Longitude: 55.102670 * North-bound Latitude: 88.827670 * East-bound Longitude: 130.129500
Date/Time Start: 2012-08-20T08:48:00 * Date/Time End: 2012-09-23T22:10:00
Minimum Elevation: -4374.5 m * Maximum Elevation: -3569.0 m
PS80/255-1 (Ice station #3) * Latitude Start: 82.670670 * Longitude Start: 109.589500 * Latitude End: 83.142333 * Longitude End: 109.929333 * Date/Time Start: 2012-08-20T08:48:00 * Date/Time End: 2012-08-22T11:49:00 * Elevation Start: -3569.0 m * Elevation End: -3608.0 m * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: Position sensor: Ship's GPS; Wind speed start: 0.6 kn; Wind speed end: 0.9 kn; Sea ice coverage start: 95 %; Sea ice coverage end: 95 %
PS80/277-1 (Ice station #4) * Latitude Start: 82.882500 * Longitude Start: 130.129500 * Latitude End: 82.894833 * Longitude End: 129.776333 * Date/Time Start: 2012-08-25T10:33:00 * Date/Time End: 2012-08-26T17:36:00 * Elevation Start: -4161.0 m * Elevation End: -4173.0 m * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: Ice station (ICE) * Comment: Position sensor: Ship's GPS; Wind speed start: 0.4 kn; Wind speed end: 0.2 kn; Sea ice coverage start: 90 %; Sea ice coverage end: 70 %
PS80/336-1 (incl. ice station) * Latitude: 85.094330 * Longitude: 122.266170 * Date/Time: 2012-09-07T09:44:00 * Elevation: -4355.4 m * Location: Arctic Ocean * Campaign: ARK-XXVII/3 (PS80 IceArc) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: Position sensor: Ship's GPS, incl. ice sampling station
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventLaukert, Georgi
2Optional event labelEvent 2Laukert, Georgi
3Date/Time of eventDate/TimeLaukert, Georgi
4Latitude of eventLatitudeLaukert, Georgi
5Longitude of eventLongitudeLaukert, Georgi
6Sea ice thicknessEsEsmLaukert, Georgi
7SalinitySalLaukert, Georgicore average
8Neodymium-143/Neodymium-144 ratio143Nd/144NdLaukert, Georgi
9ε-Neodymiumε-NdLaukert, Georgi
10ε-Neodymium, standard deviationε-Nd std dev±Laukert, Georgi
11Lanthanum, dissolvedLa disspmol/kgLaukert, Georgi
12Cerium, dissolvedCe disspmol/kgLaukert, Georgi
13Praseodymium, dissolvedPr disspmol/kgLaukert, Georgi
14Neodymium, dissolvedNd disspmol/kgLaukert, Georgi
15Samarium, dissolvedSm disspmol/kgLaukert, Georgi
16Europium, dissolvedEu disspmol/kgLaukert, Georgi
17Gadolinium, dissolvedGd disspmol/kgLaukert, Georgi
18Terbium, dissolvedTb disspmol/kgLaukert, Georgi
19Dysprosium, dissolvedDy disspmol/kgLaukert, Georgi
20Holmium, dissolvedHo disspmol/kgLaukert, Georgi
21Erbium, dissolvedEr disspmol/kgLaukert, Georgi
22Thulium, dissolvedTm disspmol/kgLaukert, Georgi
23Ytterbium, dissolvedYb disspmol/kgLaukert, Georgi
24Lutetium, dissolvedLu disspmol/kgLaukert, Georgi
25Heavy rare-earth elements/light rare-earth elements ratioHREE/LREELaukert, GeorgiNormalizedto PAAS (McLennan 2001)
78 data points

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