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The 8.2 ka BP event in north eastern North America: first combined oxygen and hydrogen isotopic data from peat in Newfoundland.

The 8.2 ka BP event in north eastern North America: first combined oxygen and hydrogen isotopic data from peat in Newfoundland.
The 8.2 ka BP event in north eastern North America: first combined oxygen and hydrogen isotopic data from peat in Newfoundland.
Finding direct evidence for atmospheric circulation change in terrestrial records of Holocene climate variability remains a fundamental challenge. Here we present the first combined stable oxygen and hydrogen isotopic palaeorecord from a peatland core in Newfoundland, Canada. Sphagnum cellulose samples were isolated from a core from Nordan's Pond Bog, Newfoundland, and analysed for ?D values. Combined with existing ?18O data, the resulting ?D/?18O bi-plot correlates directly with existing measurements of the modern (late 20th century) isotopic composition of precipitation from GNIP stations in Nova Scotia and Labrador, implying a close relationship between the estimated isotopic composition of source water used by the mosses and that of the source precipitation. We use the relative variations between the two isotope records to test the hypothesis that atmospheric circulation changed in the millennium following the 8.2-ka BP climate event. The data reveal a secondary complex isotopic response ?200 years (8250–8050 a BP) after a primary oxygen isotopic event that is widespread in the north Atlantic region. This secondary event is characterized by a divergence in oxygen and hydrogen isotope records that can most plausibly be explained by the augmentation of precipitation moisture from a more distant and more continental vapour source.
0267-8179
416-425
Daley, T.J.
5c28d905-5593-4cf6-85fc-c0e9a05ae512
Barber, K.E.
83d1acae-326d-4cb5-94b6-3d1dc78d64e9
Hughes, P.D.M.
14f83168-b203-4a91-a850-8c48535dc31b
Loader, N.J.
c49f7361-2c8c-4fe2-abbf-a6d087c51ae8
Leuenberger, M.
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Street-Perrott, F.A.
d688663d-04e2-45a8-b856-180a8ea32412
Daley, T.J.
5c28d905-5593-4cf6-85fc-c0e9a05ae512
Barber, K.E.
83d1acae-326d-4cb5-94b6-3d1dc78d64e9
Hughes, P.D.M.
14f83168-b203-4a91-a850-8c48535dc31b
Loader, N.J.
c49f7361-2c8c-4fe2-abbf-a6d087c51ae8
Leuenberger, M.
34f2d997-e281-4d0a-8436-34f7c0987367
Street-Perrott, F.A.
d688663d-04e2-45a8-b856-180a8ea32412

Daley, T.J., Barber, K.E., Hughes, P.D.M., Loader, N.J., Leuenberger, M. and Street-Perrott, F.A. (2016) The 8.2 ka BP event in north eastern North America: first combined oxygen and hydrogen isotopic data from peat in Newfoundland. [in special issue: Quaternary palaeoenvironmental proxies and processes – papers in honour of Professor Alayne Street-Perrott] Journal of Quaternary Science, 31 (4), 416-425. (doi:10.1002/jqs.2870).

Record type: Article

Abstract

Finding direct evidence for atmospheric circulation change in terrestrial records of Holocene climate variability remains a fundamental challenge. Here we present the first combined stable oxygen and hydrogen isotopic palaeorecord from a peatland core in Newfoundland, Canada. Sphagnum cellulose samples were isolated from a core from Nordan's Pond Bog, Newfoundland, and analysed for ?D values. Combined with existing ?18O data, the resulting ?D/?18O bi-plot correlates directly with existing measurements of the modern (late 20th century) isotopic composition of precipitation from GNIP stations in Nova Scotia and Labrador, implying a close relationship between the estimated isotopic composition of source water used by the mosses and that of the source precipitation. We use the relative variations between the two isotope records to test the hypothesis that atmospheric circulation changed in the millennium following the 8.2-ka BP climate event. The data reveal a secondary complex isotopic response ?200 years (8250–8050 a BP) after a primary oxygen isotopic event that is widespread in the north Atlantic region. This secondary event is characterized by a divergence in oxygen and hydrogen isotope records that can most plausibly be explained by the augmentation of precipitation moisture from a more distant and more continental vapour source.

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More information

Accepted/In Press date: 6 May 2016
e-pub ahead of print date: 17 June 2016
Published date: 2016
Organisations: Palaeoenvironment Laboratory (PLUS)

Identifiers

Local EPrints ID: 397712
URI: https://eprints.soton.ac.uk/id/eprint/397712
ISSN: 0267-8179
PURE UUID: c8058434-ad65-4230-b795-45854a2b428a

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Date deposited: 05 Jul 2016 09:20
Last modified: 02 Dec 2019 20:05

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