A new sea-level curve from Nova Scotia: evidence for a rapid acceleration of sea-level rise in the late mid-Holocene

1995 ◽  
Vol 32 (12) ◽  
pp. 2071-2080 ◽  
Author(s):  
D. B. Scott ◽  
K. Brown ◽  
E. S. Collins ◽  
F. S. Medioli
Keyword(s):  
South Carolina ◽  
Nova Scotia ◽  
Sea Level ◽  
Late Holocene ◽  
Atlantic Coast ◽  
Level Curve ◽  
Global Response ◽  
Level Curves ◽  
Ice Melt ◽  
Vertical Extent

A new late Holocene sea-level curve is presented from the Atlantic coast of Nova Scotia. Contrary to earlier data from the same area, this curve starts at 4400 sidereal years before present (BP) and shows a rapid acceleration between 4400 and 3800 BP, which coincides with a similar acceleration already reported from the Northumberland Strait (Nova Scotia) and an oscillation observed in South Carolina. Comparing the two Nova Scotia curves suggests that the acceleration lasts just over 1000 years and has a vertical extent of 10 m. One puzzling fact is that the 10 m vertical extent in Nova Scotia is 8 m more than the same event measured in South Carolina and it cannot be accounted for simply by postglacial isostatic depression, since that occurs on a much longer time scale. A closer examination of most of the sea-level curves from northeastern North America reveals that either the record is missing from this interval or it is inconsistent. We suggest that this acceleration is part of a global response that coincides with the end of the mid-Holocene warming period, possibly indicating a lag response between warming and ice melt.

A relative sea-level history for Arviat, Nunavut, and implications for Laurentide Ice Sheet thickness west of Hudson Bay

2014 ◽  
Vol 82 (1) ◽  
pp. 185-197 ◽  
Author(s):  
Karen M. Simon ◽  
Thomas S. James ◽  
Donald L. Forbes ◽  
Alice M. Telka ◽  
Arthur S. Dyke ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Ice Sheet ◽  
Tidal Range ◽  
Laurentide Ice Sheet ◽  
Hudson Bay ◽  
Level Curve ◽  
Relative Sea Level ◽  
Vertical Land Motion ◽  
Crustal Uplift

AbstractThirty-six new and previously published radiocarbon dates constrain the relative sea-level history of Arviat on the west coast of Hudson Bay. As a result of glacial isostatic adjustment (GIA) following deglaciation, sea level fell rapidly from a high-stand of nearly 170 m elevation just after 8000 cal yr BP to 60 m elevation by the mid Holocene (~ 5200 cal yr BP). The rate of sea-level fall decreased in the mid and late Holocene, with sea level falling 30 m since 3000 cal yr BP. Several late Holocene sea-level measurements are interpreted to originate from the upper end of the tidal range and place tight constraints on sea level. A preliminary measurement of present-day vertical land motion obtained by repeat Global Positioning System (GPS) occupations indicates ongoing crustal uplift at Arviat of 9.3 ± 1.5 mm/yr, in close agreement with the crustal uplift rate inferred from the inferred sea-level curve. Predictions of numerical GIA models indicate that the new sea-level curve is best fit by a Laurentide Ice Sheet reconstruction with a last glacial maximum peak thickness of ~ 3.4 km. This is a 30–35% thickness reduction of the ICE-5G ice-sheet history west of Hudson Bay.

scholarly journals Spatial variability of late Holocene and 20th century sea-level rise along the Atlantic coast of the United States

Geology ◽  
2009 ◽  
Vol 37 (12) ◽  
pp. 1115-1118 ◽  
Author(s):  
S. E. Engelhart ◽  
B. P. Horton ◽  
B. C. Douglas ◽  
W. R. Peltier ◽  
T. E. Tornqvist
Keyword(s):  
United States ◽  
Spatial Variability ◽  
Sea Level Rise ◽  
Sea Level ◽  
20Th Century ◽  
Late Holocene ◽  
Atlantic Coast ◽  
The United States

scholarly journals A late Holocene sea-level curve for the east coast of South Africa

2014 ◽  
Vol 110 (1/2) ◽  
pp. 1-9 ◽  
Author(s):  
Kate L. Strachan ◽  
Jemma M. Finch ◽  
Trevor Hill ◽  
Robert L. Barnett
Keyword(s):  
South Africa ◽  
Sea Level ◽  
Late Holocene ◽  
East Coast ◽  
Level Curve ◽  
Holocene Sea Level

scholarly journals Spatial variability of late Holocene and 20th century sea-level rise along the Atlantic coast of the United States

2018 ◽  
Author(s):  
Simon Engelhart ◽  
Benjamin Horton ◽  
Bruce Douglas ◽  
W. Peltier ◽  
Torbjorn Tornqvist
Keyword(s):  
United States ◽  
Spatial Variability ◽  
Sea Level Rise ◽  
Sea Level ◽  
20Th Century ◽  
Late Holocene ◽  
Atlantic Coast ◽  
The United States

Revisiting late Holocene sea-level change from the Gilbert Islands, Kiribati, west-central Pacific Ocean

2017 ◽  
Vol 88 (3) ◽  
pp. 400-408 ◽  
Author(s):  
Hiroya Yamano ◽  
Hajime Kayanne ◽  
Toru Yamaguchi ◽  
Tomomi Inoue ◽  
Yukira Mochida ◽  
...  
Keyword(s):  
Sea Level ◽  
Late Holocene ◽  
Marshall Islands ◽  
Level Curve ◽  
Central Pacific ◽  
Radiocarbon Age ◽  
Central Pacific Ocean ◽  
West Central ◽  
The One ◽  
Holocene Sea Level

AbstractNew coral microatoll data allow presenting an updated late Holocene sea-level curve for the Gilbert Islands of Kiribati. Examination of build-up elevation and spatial distribution of microatolls, along with radiocarbon age data from coral samples, suggest an approximately 1 m sea-level high stand, possibly lasting from ~3500 to 1900 cal yr BP. Our sea-level curve, which is similar to the one reported from the Marshall Islands, is a baseline to reconstruct the evolution of reef flats and reef islands. In addition, it provides important contextual data to infer human settlement on islands in the west-central Pacific.

Late Holocene salt marsh development under a regime of rapid relative-sea-level rise: Chezzetcook Inlet, Nova Scotia. Implications for the interpretation of palaeomarsh sequences

1993 ◽  
Vol 30 (7) ◽  
pp. 1374-1384 ◽  
Author(s):  
S. C. Jennings ◽  
R. W. G. Carter ◽  
J. D. Orford
Keyword(s):  
Nova Scotia ◽  
Salt Marsh ◽  
Sea Level Rise ◽  
Sea Level ◽  
Late Holocene ◽  
Environmental Gradients ◽  
Relative Sea Level ◽  
Spatial Changes ◽  
Relative Sea Level Rise ◽  
Outer Estuary

Pollen data illustrating a 2000-year record of salt marsh development have been obtained from a variety of outer-estuarine settings in close proximity to the present gravel-dominated coastal barriers at Chezzetcook Inlet, Nova Scotia. The relationship between the biostratigraphic and lithostratigraphic data and relative-sea-level movement is complex. In the outer estuary, temporal and spatial changes to the floral and sedimentological composition of the salt marsh reflect principally processes of estuarine and back-barrier sedimentation that resulted in steep environmental gradients and the development of regressive marsh–sediment complexes, despite a relative-sea-level rise of up to 3.8 mm/a during the late Holocene. Our results contrast with those from the inner estuary at Chezzetcook Inlet, where salt marsh has developed only over the last 200 years as a result of sediment inwash due to European land use, and followed a prolonged episode (approx. 5000 years) of tidal flat conditions. This contrast highlights differences in sediment input and distribution between the outer and inner estuary.

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