Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O
OS51C-1004 Dissolved radiogenic Nd isotopes (εNd), rare earth element (REE), Ba, and nutrient concentrations combined with oxygen isotopes retrieved along a section between Spitsbergen and Greenland at approximately 79°N during the ARK XXVII/1 cruise in 2012 were measured to characterize the origin...
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ftoceanrep:oai:oceanrep.geomar.de:25490 2023-05-15T14:26:10+02:00 Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O Laukert, Georgi Frank, Martin Hathorne, Ed Bauch, Dorothea Wegner, Carolyn Cao, Zhimian Zieringer, Moritz Andersen, Nils Kassens, Heidemarie 2014 https://oceanrep.geomar.de/id/eprint/25490/ unknown Laukert, G. , Frank, M. , Hathorne, E. , Bauch, D. , Wegner, C., Cao, Z., Zieringer, M., Andersen, N. and Kassens, H. (2014) Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O. [Poster] In: AGU Fall Meeting 2014. , 15.12.-19.12.2014, San Francisco, California, USA . Conference or Workshop Item NonPeerReviewed 2014 ftoceanrep 2023-04-07T15:14:15Z OS51C-1004 Dissolved radiogenic Nd isotopes (εNd), rare earth element (REE), Ba, and nutrient concentrations combined with oxygen isotopes retrieved along a section between Spitsbergen and Greenland at approximately 79°N during the ARK XXVII/1 cruise in 2012 were measured to characterize the origin and mixing of the water masses in the Fram Strait. Deep waters below 500 m are nearly constant in Nd concentration (CNd) around 16 pmol/kg and εNd signatures range from -9.5±0.2 to -10.9±0.2. The heavy REE to light REE ratio (HREE/LREE) ranges from 4 to 5. Ba concentrations range from 47 to 58 nmol/kg, increasing slightly with depth. These homogeneous signatures do not allow identification of distinct deep water masses. The upper 500 m of the water column close to the Western Svalbard margin including the shelf is relatively warm and saline (T ≤ 5.5°C, S ≤ 35.1) and shares characteristics of Atlantic Water (AW) including low CNd (~15 pmol/kg) and relatively unradiogenic εNd signatures (-12.2±0.2). This water is also characterized by HREE/LREE around 4 and CBa around 50 nmol/kg. Low salinity surface waters on the East Greenland shelf have unradiogenic εNd signatures similar to AW (-12.4±0.3) but in contrast to AW high CNd of up to 37 pmol/kg. At the same time the HREE/LREE ratio is relatively low (~3.5) and CBa reaches 73 nmol/kg. This suggests a significant freshwater contribution either from the McKenzie or the Lena rivers. Eastwards of these freshwater-influenced waters (at ~5°W), admixture of a Pacific component characterized by a more radiogenic εNd (-8.8±0.2) and high nutrient concentrations outcropping at surface was detected. Waters of the same origin are present on the East Greenland shelf at about 150 m depth. Based on these data we use mass balance calculations to determine the fractions of sea ice meltwater, Eurasian run-off, North American run-off, and Arctic seawater and compare these results with our εNd and REE data. Conference Object Arctic Arctic Arctic Ocean East Greenland Fram Strait Greenland Sea ice Svalbard Svalbard margin Spitsbergen OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Greenland Pacific Svalbard The Ark ENVELOPE(-24.789,-24.789,-80.691,-80.691) |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
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unknown |
description |
OS51C-1004 Dissolved radiogenic Nd isotopes (εNd), rare earth element (REE), Ba, and nutrient concentrations combined with oxygen isotopes retrieved along a section between Spitsbergen and Greenland at approximately 79°N during the ARK XXVII/1 cruise in 2012 were measured to characterize the origin and mixing of the water masses in the Fram Strait. Deep waters below 500 m are nearly constant in Nd concentration (CNd) around 16 pmol/kg and εNd signatures range from -9.5±0.2 to -10.9±0.2. The heavy REE to light REE ratio (HREE/LREE) ranges from 4 to 5. Ba concentrations range from 47 to 58 nmol/kg, increasing slightly with depth. These homogeneous signatures do not allow identification of distinct deep water masses. The upper 500 m of the water column close to the Western Svalbard margin including the shelf is relatively warm and saline (T ≤ 5.5°C, S ≤ 35.1) and shares characteristics of Atlantic Water (AW) including low CNd (~15 pmol/kg) and relatively unradiogenic εNd signatures (-12.2±0.2). This water is also characterized by HREE/LREE around 4 and CBa around 50 nmol/kg. Low salinity surface waters on the East Greenland shelf have unradiogenic εNd signatures similar to AW (-12.4±0.3) but in contrast to AW high CNd of up to 37 pmol/kg. At the same time the HREE/LREE ratio is relatively low (~3.5) and CBa reaches 73 nmol/kg. This suggests a significant freshwater contribution either from the McKenzie or the Lena rivers. Eastwards of these freshwater-influenced waters (at ~5°W), admixture of a Pacific component characterized by a more radiogenic εNd (-8.8±0.2) and high nutrient concentrations outcropping at surface was detected. Waters of the same origin are present on the East Greenland shelf at about 150 m depth. Based on these data we use mass balance calculations to determine the fractions of sea ice meltwater, Eurasian run-off, North American run-off, and Arctic seawater and compare these results with our εNd and REE data. |
format |
Conference Object |
author |
Laukert, Georgi Frank, Martin Hathorne, Ed Bauch, Dorothea Wegner, Carolyn Cao, Zhimian Zieringer, Moritz Andersen, Nils Kassens, Heidemarie |
spellingShingle |
Laukert, Georgi Frank, Martin Hathorne, Ed Bauch, Dorothea Wegner, Carolyn Cao, Zhimian Zieringer, Moritz Andersen, Nils Kassens, Heidemarie Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O |
author_facet |
Laukert, Georgi Frank, Martin Hathorne, Ed Bauch, Dorothea Wegner, Carolyn Cao, Zhimian Zieringer, Moritz Andersen, Nils Kassens, Heidemarie |
author_sort |
Laukert, Georgi |
title |
Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O |
title_short |
Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O |
title_full |
Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O |
title_fullStr |
Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O |
title_full_unstemmed |
Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O |
title_sort |
water mass provenance and mixing in the fram strait, arctic ocean – multi-proxy evidence from dissolved nd isotopes, rees, ba, nutrients, and δ18o |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/25490/ |
long_lat |
ENVELOPE(-24.789,-24.789,-80.691,-80.691) |
geographic |
Arctic Arctic Ocean Greenland Pacific Svalbard The Ark |
geographic_facet |
Arctic Arctic Ocean Greenland Pacific Svalbard The Ark |
genre |
Arctic Arctic Arctic Ocean East Greenland Fram Strait Greenland Sea ice Svalbard Svalbard margin Spitsbergen |
genre_facet |
Arctic Arctic Arctic Ocean East Greenland Fram Strait Greenland Sea ice Svalbard Svalbard margin Spitsbergen |
op_relation |
Laukert, G. , Frank, M. , Hathorne, E. , Bauch, D. , Wegner, C., Cao, Z., Zieringer, M., Andersen, N. and Kassens, H. (2014) Water mass provenance and mixing in the Fram Strait, Arctic Ocean – Multi-proxy evidence from dissolved Nd isotopes, REEs, Ba, nutrients, and δ18O. [Poster] In: AGU Fall Meeting 2014. , 15.12.-19.12.2014, San Francisco, California, USA . |
_version_ |
1766298638594605056 |