A B MACKENZIE
Biographic Data
| ID | 5216194 |
|---|---|
| NAME | A B MACKENZIE |
| GIVEN NAMES | A B |
| FAMILY NAME | MACKENZIE |
| SIGNATURE | MACKENZIE A B |
| AFFILIATIONS | Scottish Universities Environmental Research Centre |
| VERIFIED | No |
| TOTAL WORKS | 7 |
| TOTAL CITATIONS | 34 |
| WORKS AS AUTHOR | 7 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1988 |
| LATEST PUBLICATION YEAR | 2010 |
| H-INDEX | 3 |
Climate variability over the last two millennia in the North American Monsoon region, recorded in laminated lake sediments from Laguna de Juanacatlán, Mexico
High-resolution titanium (Ti) data obtained using an ITRAX XRF core scanner from a laminated sediment core from the Laguna de Juanacatlán, western central Mexico yield a unique high-resolution record of runoff (precipitation) change for the last 2000 years. In the absence of reliable, long-term meteorological records, comparison of the Ti data with information from the rich Spanish colonial period archives and the post-Independence period, confir…
Lake Sediments Record Sensitivity of Two Hydrologically Closed Upland Lakes in Mexico to Human Impact
We provide evidence of rapid, recent environmental change in two lakes in the highlands of central Mexico. Multiple sediment cores were obtained from Lago de Zirahuén (Michoacán) and Laguna de Juanacatlán (Jalisco). Analysis of diatom assemblages, magnetic susceptibility, and metal concentrations was carried out, with the chronology provided by 210Pb dating, 14C dating, and tephrochronology. There is evidence of catchment disturbance during the c…
Sellafield-Derived Anthropogenic 14 C in the Marine Intertidal Environment of the NE Irish Sea
The intertidal biota from Parton beach, close to the Sellafield nuclear fuel reprocessing plant, were all found to be enriched in radiocarbon relative to ambient background. The degree of enrichment appears to reflect the positions of the biota in the food chain once the dilution in seaweed from atmospheric uptake is taken into account. Close to the low-water mark, the order was mussels > limpets > anemones winkles > seaweed. The same order was o…
Sources of Anthropogenic 14 C to the North Sea
The Sellafield nuclear fuel reprocessing plant on the northwest coast of England is the largest source of anthropogenic radiocarbon to the UK coastal environment. In a mid-1990s study of 14 C distribution around the UK coast, the pattern of dilution with increasing distance from Sellafield appeared to be perturbed by anomalously high 14 C activities in marine biota in the coastal environment of northeast England. This present study was undertaken…
The Behavior of Sellafield-Derived 14 C in the Northeast Irish Sea
Radiocarbon is an important constituent of the low level, liquid, radioactive effluent discharged from the Sellafield nuclear fuel reprocessing plant in northwest England, but despite the fact that it gives the highest collective dose commitment of all the nuclides in the waste, its behavior in the Irish Sea is poorly defined. There is therefore a clear requirement for an improved understanding of 14 C behavior in the Irish Sea, to assist with do…
Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments
We compared accelerator mass spectrometry (AMS) 14 C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14 C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine ( −1 in Core 11881 and 5.9 cm ka −1 in Core 11886). Consideration of various factors that might produce such …
A Test of the Use of Neutron Activation Analysis for Clay Source Characterization
A description is provided of the analytical and statistical methods used in a study of the later prehistoric pottery of the Western Isles of Scotland. The accuracy and precision of the methods used are discussed and results are presented for the analysis of a set of clay samples from known locations. The study indicates that the methods employed provide an adequate means of characterizing clays from the various sources used. In addition the use o…
Climate variability over the last two millennia in the North American Monsoon region, recorded in laminated lake sediments from Laguna de Juanacatlán, Mexico
High-resolution titanium (Ti) data obtained using an ITRAX XRF core scanner from a laminated sediment core from the Laguna de Juanacatlán, western central Mexico yield a unique high-resolution record of runoff (precipitation) change for the last 2000 years. In the absence of reliable, long-term meteorological records, comparison of the Ti data with information from the rich Spanish colonial period archives and the post-Independence period, confir…
Sellafield-Derived Anthropogenic 14 C in the Marine Intertidal Environment of the NE Irish Sea
The intertidal biota from Parton beach, close to the Sellafield nuclear fuel reprocessing plant, were all found to be enriched in radiocarbon relative to ambient background. The degree of enrichment appears to reflect the positions of the biota in the food chain once the dilution in seaweed from atmospheric uptake is taken into account. Close to the low-water mark, the order was mussels > limpets > anemones winkles > seaweed. The same order was o…
Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments
We compared accelerator mass spectrometry (AMS) 14 C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14 C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine ( −1 in Core 11881 and 5.9 cm ka −1 in Core 11886). Consideration of various factors that might produce such …
A Test of the Use of Neutron Activation Analysis for Clay Source Characterization
A description is provided of the analytical and statistical methods used in a study of the later prehistoric pottery of the Western Isles of Scotland. The accuracy and precision of the methods used are discussed and results are presented for the analysis of a set of clay samples from known locations. The study indicates that the methods employed provide an adequate means of characterizing clays from the various sources used. In addition the use o…
Sources of Anthropogenic 14 C to the North Sea
The Sellafield nuclear fuel reprocessing plant on the northwest coast of England is the largest source of anthropogenic radiocarbon to the UK coastal environment. In a mid-1990s study of 14 C distribution around the UK coast, the pattern of dilution with increasing distance from Sellafield appeared to be perturbed by anomalously high 14 C activities in marine biota in the coastal environment of northeast England. This present study was undertaken…
The Behavior of Sellafield-Derived 14 C in the Northeast Irish Sea
Radiocarbon is an important constituent of the low level, liquid, radioactive effluent discharged from the Sellafield nuclear fuel reprocessing plant in northwest England, but despite the fact that it gives the highest collective dose commitment of all the nuclides in the waste, its behavior in the Irish Sea is poorly defined. There is therefore a clear requirement for an improved understanding of 14 C behavior in the Irish Sea, to assist with do…
A Test of the Use of Neutron Activation Analysis for Clay Source Characterization
A description is provided of the analytical and statistical methods used in a study of the later prehistoric pottery of the Western Isles of Scotland. The accuracy and precision of the methods used are discussed and results are presented for the analysis of a set of clay samples from known locations. The study indicates that the methods employed provide an adequate means of characterizing clays from the various sources used. In addition the use o…
Radiocarbon Age Offsets in Different-Sized Carbonate Components of Deep-Sea Sediments
We compared accelerator mass spectrometry (AMS) 14 C ages of large (>150 μm) pelagic foraminifera with radiometric bulk carbonate 14 C ages in two northeastern Atlantic cores. The foraminiferal ages are consistently older than those of the bulk sediment (by + 0.76 ka in Core 11881 and by + 1.1 ka in Core 11886), whereas corresponding fine ( −1 in Core 11881 and 5.9 cm ka −1 in Core 11886). Consideration of various factors that might produce such …
The Behavior of Sellafield-Derived 14 C in the Northeast Irish Sea
Radiocarbon is an important constituent of the low level, liquid, radioactive effluent discharged from the Sellafield nuclear fuel reprocessing plant in northwest England, but despite the fact that it gives the highest collective dose commitment of all the nuclides in the waste, its behavior in the Irish Sea is poorly defined. There is therefore a clear requirement for an improved understanding of 14 C behavior in the Irish Sea, to assist with do…
Sellafield-Derived Anthropogenic 14 C in the Marine Intertidal Environment of the NE Irish Sea
The intertidal biota from Parton beach, close to the Sellafield nuclear fuel reprocessing plant, were all found to be enriched in radiocarbon relative to ambient background. The degree of enrichment appears to reflect the positions of the biota in the food chain once the dilution in seaweed from atmospheric uptake is taken into account. Close to the low-water mark, the order was mussels > limpets > anemones winkles > seaweed. The same order was o…
Sources of Anthropogenic 14 C to the North Sea
The Sellafield nuclear fuel reprocessing plant on the northwest coast of England is the largest source of anthropogenic radiocarbon to the UK coastal environment. In a mid-1990s study of 14 C distribution around the UK coast, the pattern of dilution with increasing distance from Sellafield appeared to be perturbed by anomalously high 14 C activities in marine biota in the coastal environment of northeast England. This present study was undertaken…
Lake Sediments Record Sensitivity of Two Hydrologically Closed Upland Lakes in Mexico to Human Impact
We provide evidence of rapid, recent environmental change in two lakes in the highlands of central Mexico. Multiple sediment cores were obtained from Lago de Zirahuén (Michoacán) and Laguna de Juanacatlán (Jalisco). Analysis of diatom assemblages, magnetic susceptibility, and metal concentrations was carried out, with the chronology provided by 210Pb dating, 14C dating, and tephrochronology. There is evidence of catchment disturbance during the c…
Climate variability over the last two millennia in the North American Monsoon region, recorded in laminated lake sediments from Laguna de Juanacatlán, Mexico
High-resolution titanium (Ti) data obtained using an ITRAX XRF core scanner from a laminated sediment core from the Laguna de Juanacatlán, western central Mexico yield a unique high-resolution record of runoff (precipitation) change for the last 2000 years. In the absence of reliable, long-term meteorological records, comparison of the Ti data with information from the rich Spanish colonial period archives and the post-Independence period, confir…
Geology (7 works) · Oceanography (6 works) · Chemistry (5 works) · Isotope Analysis in Ecology (5 works) · Archaeology and ancient environmental studies (4 works) · Geography (4 works) · Paleontology (4 works) · Sediment (4 works) · Ecology (3 works) · Environmental Science (3 works)