A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges
A climatically sensitive, oscillatory pattern of progradation and erosion is revealed in late Holocene accretionary sand ridge and barrier island complexes of Seward Peninsula, northwest Alaska. Archaeological and geological radiocarbon dates constrain our chronology for the Cape Espenberg beach rid...
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ftdtic:ADP007353 2023-05-15T16:37:41+02:00 A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges Mason, Owen K. Jordan, James W. ALASKA UNIV FAIRBANKS 1992-03 text/html http://www.dtic.mil/docs/citations/ADP007353 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007353 en eng http://www.dtic.mil/docs/citations/ADP007353 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Geography Snow Ice and Permafrost Meteorology Physical and Dynamic Oceanography *ALASKA *BEACHES *DUNES *RIDGES *SEDIMENTATION *CLIMATE BARRIERS DEPOSITS EROSION ICE INTERVALS ISLANDS PATTERNS PEAT PENINSULAS SAND SOILS TRANSPORT SYMPOSIA RADIOCARBON DATING Component Reports *Holocene Progradation Text 1992 ftdtic 2016-02-19T17:39:58Z A climatically sensitive, oscillatory pattern of progradation and erosion is revealed in late Holocene accretionary sand ridge and barrier island complexes of Seward Peninsula, northwest Alaska. Archaeological and geological radiocarbon dates constrain our chronology for the Cape Espenberg beach ridge plain and the Shishmaref barrier islands, 50 km to the southwest. Cape Espenberg, the depositional sink for the northeastward longshore transport system, contains the oldest sedimentary deposits: 3700 +/- 90 B.P. (B-23170) old grass from a paleosol in a low dune. The oldest date on the Shishmaref barrier islands is 1550 +/- 70 B.P. (B-23183) and implies that the modern barrier is a comparatively recent phenomenon. Late Holocene sedimentation along the Seward Peninsula varied between intervals of rapid progradation and erosion. Rapid progradation predominated from 4000-3300 B.P. and from 2000-1200 B.P., with the generation of low beach ridges without dunes, separated by wide swales. During erosional periods higher dunes built atop beach ridges: as between 3300-2000 B.P. and intermittently from 1000 B.P. to the present. Dune formation correlates with the Neoglacial and Little Ice Age glacial advances and increased alluviation in northern and central Alaska, while rapid progradation is contemporaneous with warmer intervals of soil and/or, peat formation atop alluvial terraces, dated to 4000-3500 and 2000-1000 B.P. This article is from 'Proceedings of the International Conference on the Role of Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p649-657. See also Volume 1, AD-A253 027. Text Ice permafrost Seward Peninsula Alaska Defense Technical Information Center: DTIC Technical Reports database Fairbanks Barrier Islands ENVELOPE(-92.283,-92.283,62.784,62.784) Barrier Island ENVELOPE(78.396,78.396,-68.431,-68.431) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geography Snow Ice and Permafrost Meteorology Physical and Dynamic Oceanography *ALASKA *BEACHES *DUNES *RIDGES *SEDIMENTATION *CLIMATE BARRIERS DEPOSITS EROSION ICE INTERVALS ISLANDS PATTERNS PEAT PENINSULAS SAND SOILS TRANSPORT SYMPOSIA RADIOCARBON DATING Component Reports *Holocene Progradation |
spellingShingle |
Geography Snow Ice and Permafrost Meteorology Physical and Dynamic Oceanography *ALASKA *BEACHES *DUNES *RIDGES *SEDIMENTATION *CLIMATE BARRIERS DEPOSITS EROSION ICE INTERVALS ISLANDS PATTERNS PEAT PENINSULAS SAND SOILS TRANSPORT SYMPOSIA RADIOCARBON DATING Component Reports *Holocene Progradation Mason, Owen K. Jordan, James W. A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges |
topic_facet |
Geography Snow Ice and Permafrost Meteorology Physical and Dynamic Oceanography *ALASKA *BEACHES *DUNES *RIDGES *SEDIMENTATION *CLIMATE BARRIERS DEPOSITS EROSION ICE INTERVALS ISLANDS PATTERNS PEAT PENINSULAS SAND SOILS TRANSPORT SYMPOSIA RADIOCARBON DATING Component Reports *Holocene Progradation |
description |
A climatically sensitive, oscillatory pattern of progradation and erosion is revealed in late Holocene accretionary sand ridge and barrier island complexes of Seward Peninsula, northwest Alaska. Archaeological and geological radiocarbon dates constrain our chronology for the Cape Espenberg beach ridge plain and the Shishmaref barrier islands, 50 km to the southwest. Cape Espenberg, the depositional sink for the northeastward longshore transport system, contains the oldest sedimentary deposits: 3700 +/- 90 B.P. (B-23170) old grass from a paleosol in a low dune. The oldest date on the Shishmaref barrier islands is 1550 +/- 70 B.P. (B-23183) and implies that the modern barrier is a comparatively recent phenomenon. Late Holocene sedimentation along the Seward Peninsula varied between intervals of rapid progradation and erosion. Rapid progradation predominated from 4000-3300 B.P. and from 2000-1200 B.P., with the generation of low beach ridges without dunes, separated by wide swales. During erosional periods higher dunes built atop beach ridges: as between 3300-2000 B.P. and intermittently from 1000 B.P. to the present. Dune formation correlates with the Neoglacial and Little Ice Age glacial advances and increased alluviation in northern and central Alaska, while rapid progradation is contemporaneous with warmer intervals of soil and/or, peat formation atop alluvial terraces, dated to 4000-3500 and 2000-1000 B.P. This article is from 'Proceedings of the International Conference on the Role of Polar Regions in Global Change Held in Fairbanks, Alaska on 11-15 June 1990. Volume 2', AD-A253 028, p649-657. See also Volume 1, AD-A253 027. |
author2 |
ALASKA UNIV FAIRBANKS |
format |
Text |
author |
Mason, Owen K. Jordan, James W. |
author_facet |
Mason, Owen K. Jordan, James W. |
author_sort |
Mason, Owen K. |
title |
A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges |
title_short |
A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges |
title_full |
A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges |
title_fullStr |
A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges |
title_full_unstemmed |
A Proxy Late Holocene Climatic Record Deduced from Northwest Alaska Beach Ridges |
title_sort |
proxy late holocene climatic record deduced from northwest alaska beach ridges |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADP007353 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP007353 |
long_lat |
ENVELOPE(-92.283,-92.283,62.784,62.784) ENVELOPE(78.396,78.396,-68.431,-68.431) |
geographic |
Fairbanks Barrier Islands Barrier Island |
geographic_facet |
Fairbanks Barrier Islands Barrier Island |
genre |
Ice permafrost Seward Peninsula Alaska |
genre_facet |
Ice permafrost Seward Peninsula Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP007353 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027978535337984 |