scholarly journals Changes in lake-sediment stratigraphy associated with late glacial climate change: examples from western Nova Scotia

10.4138/2052 ◽  
1998 ◽  
Vol 34 (3) ◽  
Author(s):  
Ian S. Spooner
Keyword(s):  
Climate Change ◽  
Nova Scotia ◽  
Lake Sediment ◽  
Late Glacial ◽  
Sediment Stratigraphy ◽  
Glacial Climate

Rapid human response to Late Glacial climate change: a reply to Housley et al. (2000)

Antiquity ◽  
2000 ◽  
Vol 74 (284) ◽  
pp. 427-428 ◽  
Author(s):  
S. P. E. Blockley ◽  
R. E. Donahue ◽  
A. M. Pollard
Keyword(s):  
Climate Change ◽  
Late Glacial ◽  
Calibration Data ◽  
Human Response ◽  
Weak Correlation ◽  
Two Stage ◽  
Calibration Curves ◽  
Colonization Model ◽  
Glacial Climate ◽  
Radiocarbon Calibration

In their reply to our recent paper (Blockley et al.2000), Housley et ~ l(2.0 00) make four substantialpoints. Firstly, they assert that our critique oftheir two-stage re-colonization model rests solelyupon radiocarbon calibration. Secondly, and consequently,they point to problems with Late Glacialcalibration curves. Thirdly, they argue thatradiocarbon calibration should be advanced onlyfor sound archaeological reasons. Finally, theystate that our approach is environmentally deterministicand that we have demonstrated onlya weak correlation between human demographicchange and rapid climatic amelioration.Housley et al. (2000) argue against the use ofLate Glacial calibration curves, and in particularstate that 'it is because the calibration data are soheavily smoothed that Blockley et al. dispute ournotion of a northward movement of people'

Post-glacial climate change and its effect on a shallow dimictic lake in Nova Scotia, Canada

2009 ◽  
Vol 43 (1) ◽  
pp. 15-27 ◽  
Author(s):  
Brent Lennox ◽  
Ian Spooner ◽  
Timothy Jull ◽  
William P. Patterson
Keyword(s):  
Climate Change ◽  
Nova Scotia ◽  
Glacial Climate

A midge-based late-glacial temperature reconstruction from southwestern Nova Scotia

2005 ◽  
Vol 42 (11) ◽  
pp. 2051-2057 ◽  
Author(s):  
Bronwen S Whitney ◽  
Jessie H Vincent ◽  
Les C Cwynar
Keyword(s):  
Nova Scotia ◽  
Younger Dryas ◽  
Temperature Reconstruction ◽  
Late Glacial ◽  
Organic Content ◽  
Eastern North America ◽  
Quantitative Reconstruction ◽  
Late Glacial Period ◽  
Maritime Canada ◽  
Glacial Climate

We present a quantitative reconstruction of the thermal regime spanning the late-glacial period of Nova Scotia (14 700 to 11 600 BP) as inferred by analyzing fossil midges from a small lake (Lac à Magie) in southwestern Nova Scotia. The GS-1 event (equivalent to the Younger Dryas, dating from 12 700 to 11 600 BP in Maritime Canada) was marked by a 5 °C decline in inferred mean July surface-water temperatures and a 15% drop in organic content. Previous pollen and plant macrofossil analyses of this site demonstrate a response of vegetation to GS-1 cooling. These data, coupled with a midge-inferred temperature reconstruction from a nearby site, suggest that late-glacial climate change was less pronounced in southern Nova Scotia than in other sites in Maritime Canada and adjacent eastern North America.

Timing of the late-glacial climate reversal in the Southern Hemisphere using high-resolution radiocarbon chronology for Kaipo Bog, New Zealand

2006 ◽  
Vol 65 (02) ◽  
pp. 340-345 ◽  
Author(s):  
Irka Hajdas ◽  
David J. Lowe ◽  
Rewi M. Newnham ◽  
Georges Bonani
Keyword(s):  
Climate Change ◽  
New Zealand ◽  
High Resolution ◽  
Southern Hemisphere ◽  
Younger Dryas ◽  
Late Glacial ◽  
Bulk Sediment ◽  
Radiocarbon Chronology ◽  
The Antarctic ◽  
Glacial Climate

AbstractThe pattern of climate change in the Southern Hemisphere during the Younger Dryas (YD) chronozone provides essential constraint on mechanisms of abrupt climate change only if accurate, high-precision chronologies are obtained. A climate reversal reported previously at Kaipo bog, New Zealand, had been dated between 13,600 and 12,600 cal yr B.P. and appeared to asynchronously overlap the YD chron, but the chronology, based on conventionally radiocarbon-dated bulk sediment samples, left the precise timing questionable. We report a new high-resolution AMS 14C chronology for the Kaipo record that confirms the original chronology and provides further evidence for a mid-latitude Southern Ocean cooling event dated between 13,800 and 12,400 cal yr B.P. (2σ range), roughly equivalent to the Antarctic Cold Reversal.

Vegetational and climatic history of Nova Scotia. I. Radiocarbon-dated pollen profiles from Halifax, Nova Scotia

1987 ◽  
Vol 65 (7) ◽  
pp. 1482-1490 ◽  
Author(s):  
J. Gordon Ogden III
Keyword(s):  
Nova Scotia ◽  
Sediment Cores ◽  
Birch Pollen ◽  
Late Glacial ◽  
Fagus Grandifolia ◽  
Radiocarbon Dates ◽  
Sediment Stratigraphy ◽  
Catchment Areas ◽  
Pollen Types ◽  
Open Country

Pollen and sediment stratigraphy of three lakes in the Halifax, N.S., area show similarities and differences related to morphometry and hydrology. Five radiocarbon dates from two of the cores provide sedimentation rate estimates ranging from 0.31 to 0.58 mm/year with an r2 of 0.97. Organic sedimentation was initiated in lakes in the Halifax area about 12 000 years ago. Low pollen densities and high proportions of herbaceous and shrub pollen types imply open country or tundra-like vegetational cover until ca. 10 000 B.P. A possible Allerød-type late-glacial climatic oscillation is apparent from the sediment and pollen records. Small birch pollen (cf. Betula nana), pine, spruce, willow, and ericaceous pollen dominate the late-glacial (ca. 12 000–10 000 B.P.) predominantly inorganic section of the sediment cores. It is presumed from the pollen data that hemlock (Tsuga canadensis) invaded the catchment areas about 8000 years ago, and that beech (Fagus grandifolia) arrived about 5000 years ago. Thermophilous Appalachian elements (Nyssa, Carya, Juglans, and Tilia) have never been part of postglacial Nova Scotian forests.

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