Episodic fresh surface waters in the Eocene Arctic Ocean.
It has been suggested, on the basis of modern hydrology and fully coupled palaeoclimate simulations, that the warm greenhouse conditions that characterized the early Palaeogene period (55-45 Myr ago) probably induced an intensified hydrological cycle with precipitation exceeding evaporation at high...
Published in: | Nature |
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Online Access: | http://hdl.handle.net/11577/1564701 https://doi.org/10.1038/nature04692 |
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ftunivpadovairis:oai:www.research.unipd.it:11577/1564701 2024-02-11T09:59:59+01:00 Episodic fresh surface waters in the Eocene Arctic Ocean. BRINKHUIS H SCHOUTEN S COLLINSON M. E SLUIJS A SINNINGHE DAMST J. S DICKENS G. R HUBER M CRONIN T. M ONODERA J TAKAHASHI K BUJAK J. P STEIN R VAN DER BURGH J ELDRETT J. S HARDING I. C LOTTER A. F SANGIORGI F VAN KONIJNENBURG VAN CITTERT H DE LEEUW J. W MATTHIESSEN J BACKMAN J MORAN K CLEMENS S EYNAUD F GATTACCECA J JAKOBSSON M JORDAN R KAMINSKI M KING J KOC N MARTINEZ N. C MCINROY D MOORE T. C O'REGAN M PLIKE H REA B SAKAMOTO T SMITH D. C ST JOHN K. E. K SUTO I SUZUKI N WATANABE M YAMAMOTO M. RIO, DOMENICO Brinkhuis, H Schouten, S Collinson, M. E. Sluijs, A SINNINGHE DAMST, J. S. Dickens, G. R. Huber, M Cronin, T. M. Onodera, J Takahashi, K Bujak, J. P. Stein, R VAN DER BURGH, J Eldrett, J. S. Harding, I. C. Lotter, A. F. Sangiorgi, F VAN KONIJNENBURG VAN CITTERT, H DE LEEUW, J. W. Matthiessen, J Backman, J Moran, K Clemens, S Eynaud, F Gattacceca, J Jakobsson, M Jordan, R Kaminski, M King, J Koc, N Martinez, N. C. Mcinroy, D Moore, T. C. O'Regan, M Plike, H Rea, B Rio, Domenico Sakamoto, T Smith, D. C. ST JOHN, K. E. K. Suto, I Suzuki, N Watanabe, M Yamamoto, M. 2006 STAMPA http://hdl.handle.net/11577/1564701 https://doi.org/10.1038/nature04692 eng eng volume:441 firstpage:606 lastpage:609 numberofpages:4 journal:NATURE http://hdl.handle.net/11577/1564701 doi:10.1038/nature04692 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33745243680 Eocene fern greenhouse ecosystem hydrological cycle microfossil paleoclimate Paleogene info:eu-repo/semantics/article 2006 ftunivpadovairis https://doi.org/10.1038/nature04692 2024-01-24T17:35:26Z It has been suggested, on the basis of modern hydrology and fully coupled palaeoclimate simulations, that the warm greenhouse conditions that characterized the early Palaeogene period (55-45 Myr ago) probably induced an intensified hydrological cycle with precipitation exceeding evaporation at high latitudes. Little field evidence, however, has been available to constrain oceanic conditions in the Arctic during this period. Here we analyse Palaeogene sediments obtained during the Arctic Coring Expedition, showing that large quantities of the free-floating fern Azolla grew and reproduced in the Arctic Ocean by the onset of the middle Eocene epoch (∼50 Myr ago). The Azolla and accompanying abundant freshwater organic and siliceous microfossils indicate an episodic freshening of Arctic surface waters during an ∼800,000-year interval. The abundant remains of Azolla that characterize basal middle Eocene marine deposits of all Nordic seas probably represent transported assemblages resulting from freshwater spills from the Arctic Ocean that reached as far south as the North Sea. The termination of the Azolla phase in the Arctic coincides with a local sea surface temperature rise from ∼10°C to 13°C, pointing to simultaneous increases in salt and heat supply owing to the influx of waters from adjacent oceans. We suggest that onset and termination of the Azolla phase depended on the degree of oceanic exchange between Arctic Ocean and adjacent seas. © 2006 Nature Publishing Group. Article in Journal/Newspaper Arctic Arctic Ocean Nordic Seas Padua Research Archive (IRIS - Università degli Studi di Padova) Arctic Arctic Ocean Nature 441 7093 606 609 |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
Eocene fern greenhouse ecosystem hydrological cycle microfossil paleoclimate Paleogene |
spellingShingle |
Eocene fern greenhouse ecosystem hydrological cycle microfossil paleoclimate Paleogene BRINKHUIS H SCHOUTEN S COLLINSON M. E SLUIJS A SINNINGHE DAMST J. S DICKENS G. R HUBER M CRONIN T. M ONODERA J TAKAHASHI K BUJAK J. P STEIN R VAN DER BURGH J ELDRETT J. S HARDING I. C LOTTER A. F SANGIORGI F VAN KONIJNENBURG VAN CITTERT H DE LEEUW J. W MATTHIESSEN J BACKMAN J MORAN K CLEMENS S EYNAUD F GATTACCECA J JAKOBSSON M JORDAN R KAMINSKI M KING J KOC N MARTINEZ N. C MCINROY D MOORE T. C O'REGAN M PLIKE H REA B SAKAMOTO T SMITH D. C ST JOHN K. E. K SUTO I SUZUKI N WATANABE M YAMAMOTO M. RIO, DOMENICO Episodic fresh surface waters in the Eocene Arctic Ocean. |
topic_facet |
Eocene fern greenhouse ecosystem hydrological cycle microfossil paleoclimate Paleogene |
description |
It has been suggested, on the basis of modern hydrology and fully coupled palaeoclimate simulations, that the warm greenhouse conditions that characterized the early Palaeogene period (55-45 Myr ago) probably induced an intensified hydrological cycle with precipitation exceeding evaporation at high latitudes. Little field evidence, however, has been available to constrain oceanic conditions in the Arctic during this period. Here we analyse Palaeogene sediments obtained during the Arctic Coring Expedition, showing that large quantities of the free-floating fern Azolla grew and reproduced in the Arctic Ocean by the onset of the middle Eocene epoch (∼50 Myr ago). The Azolla and accompanying abundant freshwater organic and siliceous microfossils indicate an episodic freshening of Arctic surface waters during an ∼800,000-year interval. The abundant remains of Azolla that characterize basal middle Eocene marine deposits of all Nordic seas probably represent transported assemblages resulting from freshwater spills from the Arctic Ocean that reached as far south as the North Sea. The termination of the Azolla phase in the Arctic coincides with a local sea surface temperature rise from ∼10°C to 13°C, pointing to simultaneous increases in salt and heat supply owing to the influx of waters from adjacent oceans. We suggest that onset and termination of the Azolla phase depended on the degree of oceanic exchange between Arctic Ocean and adjacent seas. © 2006 Nature Publishing Group. |
author2 |
Brinkhuis, H Schouten, S Collinson, M. E. Sluijs, A SINNINGHE DAMST, J. S. Dickens, G. R. Huber, M Cronin, T. M. Onodera, J Takahashi, K Bujak, J. P. Stein, R VAN DER BURGH, J Eldrett, J. S. Harding, I. C. Lotter, A. F. Sangiorgi, F VAN KONIJNENBURG VAN CITTERT, H DE LEEUW, J. W. Matthiessen, J Backman, J Moran, K Clemens, S Eynaud, F Gattacceca, J Jakobsson, M Jordan, R Kaminski, M King, J Koc, N Martinez, N. C. Mcinroy, D Moore, T. C. O'Regan, M Plike, H Rea, B Rio, Domenico Sakamoto, T Smith, D. C. ST JOHN, K. E. K. Suto, I Suzuki, N Watanabe, M Yamamoto, M. |
format |
Article in Journal/Newspaper |
author |
BRINKHUIS H SCHOUTEN S COLLINSON M. E SLUIJS A SINNINGHE DAMST J. S DICKENS G. R HUBER M CRONIN T. M ONODERA J TAKAHASHI K BUJAK J. P STEIN R VAN DER BURGH J ELDRETT J. S HARDING I. C LOTTER A. F SANGIORGI F VAN KONIJNENBURG VAN CITTERT H DE LEEUW J. W MATTHIESSEN J BACKMAN J MORAN K CLEMENS S EYNAUD F GATTACCECA J JAKOBSSON M JORDAN R KAMINSKI M KING J KOC N MARTINEZ N. C MCINROY D MOORE T. C O'REGAN M PLIKE H REA B SAKAMOTO T SMITH D. C ST JOHN K. E. K SUTO I SUZUKI N WATANABE M YAMAMOTO M. RIO, DOMENICO |
author_facet |
BRINKHUIS H SCHOUTEN S COLLINSON M. E SLUIJS A SINNINGHE DAMST J. S DICKENS G. R HUBER M CRONIN T. M ONODERA J TAKAHASHI K BUJAK J. P STEIN R VAN DER BURGH J ELDRETT J. S HARDING I. C LOTTER A. F SANGIORGI F VAN KONIJNENBURG VAN CITTERT H DE LEEUW J. W MATTHIESSEN J BACKMAN J MORAN K CLEMENS S EYNAUD F GATTACCECA J JAKOBSSON M JORDAN R KAMINSKI M KING J KOC N MARTINEZ N. C MCINROY D MOORE T. C O'REGAN M PLIKE H REA B SAKAMOTO T SMITH D. C ST JOHN K. E. K SUTO I SUZUKI N WATANABE M YAMAMOTO M. RIO, DOMENICO |
author_sort |
BRINKHUIS H |
title |
Episodic fresh surface waters in the Eocene Arctic Ocean. |
title_short |
Episodic fresh surface waters in the Eocene Arctic Ocean. |
title_full |
Episodic fresh surface waters in the Eocene Arctic Ocean. |
title_fullStr |
Episodic fresh surface waters in the Eocene Arctic Ocean. |
title_full_unstemmed |
Episodic fresh surface waters in the Eocene Arctic Ocean. |
title_sort |
episodic fresh surface waters in the eocene arctic ocean. |
publishDate |
2006 |
url |
http://hdl.handle.net/11577/1564701 https://doi.org/10.1038/nature04692 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Nordic Seas |
genre_facet |
Arctic Arctic Ocean Nordic Seas |
op_relation |
volume:441 firstpage:606 lastpage:609 numberofpages:4 journal:NATURE http://hdl.handle.net/11577/1564701 doi:10.1038/nature04692 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33745243680 |
op_doi |
https://doi.org/10.1038/nature04692 |
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Nature |
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441 |
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7093 |
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