Thomas W D Edwards
Biographic Data
| ID | 6017734 |
|---|---|
| NAME | Thomas W D Edwards |
| GIVEN NAMES | Thomas W D |
| FAMILY NAME | Edwards |
| SIGNATURE | EDWARDS T W D |
| AFFILIATIONS | University of Waterloo |
| ORCID | 0000-0001-9132-7858 |
| VERIFIED | Yes |
| TOTAL WORKS | 16 |
| TOTAL CITATIONS | 29 |
| AUTHOR COUNT | 16 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1995 |
| LATEST PUBLICATION YEAR | 2014 |
| H-INDEX | 3 |
Use of pre-industrial floodplain lake sediments to establish baseline river metal concentrations downstream of Alberta oil sands
In the Alberta oil sands region, insufficient knowledge of pre-disturbance reference conditions has undermined the ability of the Regional Aquatics Monitoring Program (RAMP) to detect pollution of the Athabasca River, because sampling began three decades after the industry started and the river naturally erodes oil-bearing strata. Here, we apply a novel approach to characterize pre-industrial reference metal concentrations in river sediment downs…
Quantifying Lake Athabasca (Canada) water level during the ‘Little Ice Age’ highstand from palaeolimnological and geophysical analyses of a transgressive barrier-beach complex
We combine multiproxy palaeolimnological and geophysical analyses of a barrier-beach complex to estimate the water level of a sustained Lake Athabasca (Canada) highstand during the ‘Little Ice Age’ (LIA; 1600—1900 CE). Palaeolimnological analyses on sediment cores from the lagoon behind the barrier indicate high water levels during the LIA, controlled by subsurface hydrological connection with Lake Athabasca. Key features in the LIA stratigraphic…
From Isotopes to TK Interviews
Evolving research in Fort Resolution and the Slave River Delta, Northwest Territories, aims to improve understanding of how the natural ecosystem functions and responds to various environmental stressors, as well as to enhance the stewardship of natural resources and the capacity of local residents to respond to change. We seek to integrate approaches that span the natural and social sciences and traditional knowledge understandings of change, em…
Climatic Conditions in Northern Canada
This article reviews the historical, instrumental, and future changes in climate for the northern latitudes of Canada. Discussion of historical climate over the last 10 000 years focuses on major climatic shifts including the Medieval Warm Period and the Little Ice Age, and how these changes compare with those most recently experienced during the period of instrumental records. In reference to the latter, details are noted about observed trends i…
Climatic and hydrologic variability during the past millennium in the eastern Rocky Mountains and northern Great Plains of western Canada
Modelling of tree-ring δ 13 C and δ 18 O data from the Columbia Icefield area in the eastern Rocky Mountains of western Canada provides fuller understanding of climatic and hydrologic variability over the past 1000 yr in this region, based on reconstruction of changes in growth season atmospheric relative humidity ( RH grs ), winter temperature ( T win ) and the precipitation δ 18 O– T win relation. The Little Ice Age (~ AD 1530s–1890s) is marked…
Evidence of temperature depression and hydrological variations in the eastern Sierra Nevada during the Younger Dryas Stade
Sediment records from two lakes in the east-central Sierra Nevada, California, provide evidence of cooling and hydrological shifts during the Younger Dryas stade (YD; ~ 12,900–11,500 cal yr BP). A chironomid transfer function suggests that lake-water temperatures were depressed by 2°C to 4°C relative to maximum temperatures during the preceding Bølling–Allerød interstade (BA; ~ 14,500–12,900 cal yr BP). Diatom and stable isotope records suggest d…
Stable isotope variations in stalagmites from northwestern Sweden document changes in temperature and vegetation during the early Holocene
We offer an alternative palaeoenvironmental interpretation of oxygen-isotope data obtained on two early-Holocene stalagmite records from caves in the Scandes Mountains of northern Sweden (Korallgrottan and Labrintgrottan), and the well-known Søylegrotta (Norway) SG93 record with which they are compared, that differs in several respects from that proposed by the authors. Contrary to viewing these as inverted palaeotemperature records, we suggest t…
The Local Correspondence of the Royal African Company of England, 1681–1699, Vol. 3
Impacts of climate and river flooding on the hydro-ecology of a floodplain basin, Peace-Athabasca Delta, Canada since A.D. 1700
Multi-proxy paleolimnological analyses on lake sediment cores from "Spruce Island Lake" (58° 50.82′ N, 111° 28.84′ W), a perched basin in the northern Peace sector of the Peace-Athabasca Delta (PAD), Canada, give insights into the relative roles of flow regulation of the Peace River and climatic variability on the basin hydro-ecology. Results indicate substantial variability in basin hydro-ecology over the past 300 years ranging from seasonal to …
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden
A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. The study aimed to evaluate (1) the nature of climate changes that forced the late-Holocene lowering of altitudinal tree limit in the region, the timing of which is known from prior studies based on radiocarbon dating of subfos…
Effect of varying oceanicity on early- to mid-Holocene palaeohydrology, Kola Peninsula, Russia
The stable-isotope stratigraphy of sedimentary organic matter and algal cellulose in cores from two lakes near treeline on the Kola Peninsula indicate changes in water and nutrient balance that correlate with inferred expansion of Pinus sylvestris during the early to mid-Holocene. Trends in cellulose-inferred lakewater δ 18 O values for both lakes suggest that moist conditions after deglaciation were followed by progressive drying from about 9500…
Holocene changes in atmospheric circulation recorded in the oxygen-isotope stratigraphy of lacustrine carbonates from northern Sweden
The oxygen-isotope composition of local precipitation (d 18 O P ) is reconstructed from carbonate lake-sediment components in a sediment core covering the last 10000 calendar years from Lake Tibetanus, a small, hydrologically open, groundwater-fed lake in the Abisko area, northern Sweden. Comparison of the d 18 O P history with a pollen-based palaeotemperature record from the same core clearly reveals pronounced deviations from the normally expec…
Holocene Paleohydrology and Paleoclimate at Treeline, North-Central Russia, Inferred from Oxygen Isotope Records in Lake Sediment Cellulose
Lake-water oxygen-isotope histories for three lakes in northern Russia, derived from the cellulose oxygen-isotope stratigraphies of sediment cores, provide the basis for preliminary reconstruction of Holocene paleohydrology in two regions along the boreal treeline. Deconvolution of shifting precipitation δ 18 O from secondary evaporative isotopic enrichment is aided by knowledge of the distribution of isotopes in modern precipitation, the isotopi…
Changes in carbon and nitrogen cycling during tree-line retreat recorded in the isotopic content of lacustrine organic matter, western Taimyr Peninsula, Russia
Bulk organic and cellulose stable carbon isotope and bulk organic nitrogen isotope profiles from the sediments of a small tundra lake on the western Taimyr Peninsula, Russia, show changes that are correlated with climate cooling and treeline retreat at c. 4000 14 C years BP. Increased soil organic matter decomposition, combined with a moist climate, probably provided a 13 C-depleted source of CO 2(aq) to lake phytoplankton thriving under favourab…
Influence of Changing Atmospheric Circulation on Precipitation δ 18 O–Temperature Relations in Canada during the Holocene
Postglacial precipitation δ 18 O history has been reconstructed for two regions of Canada. Long-term shifts in the oxygen-isotope composition of annual precipitation (δ 18 O p ) in southern Ontario appear to have occurred with a consistent isotope–temperature relation throughout the past 11,500 14 C yr. The modern isotope–temperature relation in central Canada near present boreal treeline evidently became established between 5000 and 4000 years a…
Climate in Southwestern Ontario, Canada, between AD 1610 and 1885 Inferred from Oxygen and Hydrogen Isotopic Measurements of Wood Cellulose from Trees in Different Hydrologic Settings
Oxygen and hydrogen isotopes were measured in wood cellulose and cellulose-nitrate from trees that grew in different hydrologic settings in southwestern Ontario, Canada. An isotope model that accounts for isotopic fractionations associated with photosynthesis in plants was applied to the stable isotope data to infer past meteoric water isotopic composition and seasonal air moisture variations. The model-inferred climate data was rationalized in t…
Holocene changes in atmospheric circulation recorded in the oxygen-isotope stratigraphy of lacustrine carbonates from northern Sweden
The oxygen-isotope composition of local precipitation (d 18 O P ) is reconstructed from carbonate lake-sediment components in a sediment core covering the last 10000 calendar years from Lake Tibetanus, a small, hydrologically open, groundwater-fed lake in the Abisko area, northern Sweden. Comparison of the d 18 O P history with a pollen-based palaeotemperature record from the same core clearly reveals pronounced deviations from the normally expec…
Changes in carbon and nitrogen cycling during tree-line retreat recorded in the isotopic content of lacustrine organic matter, western Taimyr Peninsula, Russia
Bulk organic and cellulose stable carbon isotope and bulk organic nitrogen isotope profiles from the sediments of a small tundra lake on the western Taimyr Peninsula, Russia, show changes that are correlated with climate cooling and treeline retreat at c. 4000 14 C years BP. Increased soil organic matter decomposition, combined with a moist climate, probably provided a 13 C-depleted source of CO 2(aq) to lake phytoplankton thriving under favourab…
Climatic Conditions in Northern Canada
This article reviews the historical, instrumental, and future changes in climate for the northern latitudes of Canada. Discussion of historical climate over the last 10 000 years focuses on major climatic shifts including the Medieval Warm Period and the Little Ice Age, and how these changes compare with those most recently experienced during the period of instrumental records. In reference to the latter, details are noted about observed trends i…
Effect of varying oceanicity on early- to mid-Holocene palaeohydrology, Kola Peninsula, Russia
The stable-isotope stratigraphy of sedimentary organic matter and algal cellulose in cores from two lakes near treeline on the Kola Peninsula indicate changes in water and nutrient balance that correlate with inferred expansion of Pinus sylvestris during the early to mid-Holocene. Trends in cellulose-inferred lakewater δ 18 O values for both lakes suggest that moist conditions after deglaciation were followed by progressive drying from about 9500…
Quantifying Lake Athabasca (Canada) water level during the ‘Little Ice Age’ highstand from palaeolimnological and geophysical analyses of a transgressive barrier-beach complex
We combine multiproxy palaeolimnological and geophysical analyses of a barrier-beach complex to estimate the water level of a sustained Lake Athabasca (Canada) highstand during the ‘Little Ice Age’ (LIA; 1600—1900 CE). Palaeolimnological analyses on sediment cores from the lagoon behind the barrier indicate high water levels during the LIA, controlled by subsurface hydrological connection with Lake Athabasca. Key features in the LIA stratigraphic…
Climate in Southwestern Ontario, Canada, between AD 1610 and 1885 Inferred from Oxygen and Hydrogen Isotopic Measurements of Wood Cellulose from Trees in Different Hydrologic Settings
Oxygen and hydrogen isotopes were measured in wood cellulose and cellulose-nitrate from trees that grew in different hydrologic settings in southwestern Ontario, Canada. An isotope model that accounts for isotopic fractionations associated with photosynthesis in plants was applied to the stable isotope data to infer past meteoric water isotopic composition and seasonal air moisture variations. The model-inferred climate data was rationalized in t…
Influence of Changing Atmospheric Circulation on Precipitation δ 18 O–Temperature Relations in Canada during the Holocene
Postglacial precipitation δ 18 O history has been reconstructed for two regions of Canada. Long-term shifts in the oxygen-isotope composition of annual precipitation (δ 18 O p ) in southern Ontario appear to have occurred with a consistent isotope–temperature relation throughout the past 11,500 14 C yr. The modern isotope–temperature relation in central Canada near present boreal treeline evidently became established between 5000 and 4000 years a…
Changes in carbon and nitrogen cycling during tree-line retreat recorded in the isotopic content of lacustrine organic matter, western Taimyr Peninsula, Russia
Bulk organic and cellulose stable carbon isotope and bulk organic nitrogen isotope profiles from the sediments of a small tundra lake on the western Taimyr Peninsula, Russia, show changes that are correlated with climate cooling and treeline retreat at c. 4000 14 C years BP. Increased soil organic matter decomposition, combined with a moist climate, probably provided a 13 C-depleted source of CO 2(aq) to lake phytoplankton thriving under favourab…
Holocene Paleohydrology and Paleoclimate at Treeline, North-Central Russia, Inferred from Oxygen Isotope Records in Lake Sediment Cellulose
Lake-water oxygen-isotope histories for three lakes in northern Russia, derived from the cellulose oxygen-isotope stratigraphies of sediment cores, provide the basis for preliminary reconstruction of Holocene paleohydrology in two regions along the boreal treeline. Deconvolution of shifting precipitation δ 18 O from secondary evaporative isotopic enrichment is aided by knowledge of the distribution of isotopes in modern precipitation, the isotopi…
Holocene changes in atmospheric circulation recorded in the oxygen-isotope stratigraphy of lacustrine carbonates from northern Sweden
The oxygen-isotope composition of local precipitation (d 18 O P ) is reconstructed from carbonate lake-sediment components in a sediment core covering the last 10000 calendar years from Lake Tibetanus, a small, hydrologically open, groundwater-fed lake in the Abisko area, northern Sweden. Comparison of the d 18 O P history with a pollen-based palaeotemperature record from the same core clearly reveals pronounced deviations from the normally expec…
Effect of varying oceanicity on early- to mid-Holocene palaeohydrology, Kola Peninsula, Russia
The stable-isotope stratigraphy of sedimentary organic matter and algal cellulose in cores from two lakes near treeline on the Kola Peninsula indicate changes in water and nutrient balance that correlate with inferred expansion of Pinus sylvestris during the early to mid-Holocene. Trends in cellulose-inferred lakewater δ 18 O values for both lakes suggest that moist conditions after deglaciation were followed by progressive drying from about 9500…
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden
A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. The study aimed to evaluate (1) the nature of climate changes that forced the late-Holocene lowering of altitudinal tree limit in the region, the timing of which is known from prior studies based on radiocarbon dating of subfos…
Impacts of climate and river flooding on the hydro-ecology of a floodplain basin, Peace-Athabasca Delta, Canada since A.D. 1700
Multi-proxy paleolimnological analyses on lake sediment cores from "Spruce Island Lake" (58° 50.82′ N, 111° 28.84′ W), a perched basin in the northern Peace sector of the Peace-Athabasca Delta (PAD), Canada, give insights into the relative roles of flow regulation of the Peace River and climatic variability on the basin hydro-ecology. Results indicate substantial variability in basin hydro-ecology over the past 300 years ranging from seasonal to …
The Local Correspondence of the Royal African Company of England, 1681–1699, Vol. 3
Climatic and hydrologic variability during the past millennium in the eastern Rocky Mountains and northern Great Plains of western Canada
Modelling of tree-ring δ 13 C and δ 18 O data from the Columbia Icefield area in the eastern Rocky Mountains of western Canada provides fuller understanding of climatic and hydrologic variability over the past 1000 yr in this region, based on reconstruction of changes in growth season atmospheric relative humidity ( RH grs ), winter temperature ( T win ) and the precipitation δ 18 O– T win relation. The Little Ice Age (~ AD 1530s–1890s) is marked…
Evidence of temperature depression and hydrological variations in the eastern Sierra Nevada during the Younger Dryas Stade
Sediment records from two lakes in the east-central Sierra Nevada, California, provide evidence of cooling and hydrological shifts during the Younger Dryas stade (YD; ~ 12,900–11,500 cal yr BP). A chironomid transfer function suggests that lake-water temperatures were depressed by 2°C to 4°C relative to maximum temperatures during the preceding Bølling–Allerød interstade (BA; ~ 14,500–12,900 cal yr BP). Diatom and stable isotope records suggest d…
Stable isotope variations in stalagmites from northwestern Sweden document changes in temperature and vegetation during the early Holocene
We offer an alternative palaeoenvironmental interpretation of oxygen-isotope data obtained on two early-Holocene stalagmite records from caves in the Scandes Mountains of northern Sweden (Korallgrottan and Labrintgrottan), and the well-known Søylegrotta (Norway) SG93 record with which they are compared, that differs in several respects from that proposed by the authors. Contrary to viewing these as inverted palaeotemperature records, we suggest t…
From Isotopes to TK Interviews
Evolving research in Fort Resolution and the Slave River Delta, Northwest Territories, aims to improve understanding of how the natural ecosystem functions and responds to various environmental stressors, as well as to enhance the stewardship of natural resources and the capacity of local residents to respond to change. We seek to integrate approaches that span the natural and social sciences and traditional knowledge understandings of change, em…
Climatic Conditions in Northern Canada
This article reviews the historical, instrumental, and future changes in climate for the northern latitudes of Canada. Discussion of historical climate over the last 10 000 years focuses on major climatic shifts including the Medieval Warm Period and the Little Ice Age, and how these changes compare with those most recently experienced during the period of instrumental records. In reference to the latter, details are noted about observed trends i…
Quantifying Lake Athabasca (Canada) water level during the ‘Little Ice Age’ highstand from palaeolimnological and geophysical analyses of a transgressive barrier-beach complex
We combine multiproxy palaeolimnological and geophysical analyses of a barrier-beach complex to estimate the water level of a sustained Lake Athabasca (Canada) highstand during the ‘Little Ice Age’ (LIA; 1600—1900 CE). Palaeolimnological analyses on sediment cores from the lagoon behind the barrier indicate high water levels during the LIA, controlled by subsurface hydrological connection with Lake Athabasca. Key features in the LIA stratigraphic…
Use of pre-industrial floodplain lake sediments to establish baseline river metal concentrations downstream of Alberta oil sands
In the Alberta oil sands region, insufficient knowledge of pre-disturbance reference conditions has undermined the ability of the Regional Aquatics Monitoring Program (RAMP) to detect pollution of the Athabasca River, because sampling began three decades after the industry started and the river naturally erodes oil-bearing strata. Here, we apply a novel approach to characterize pre-industrial reference metal concentrations in river sediment downs…
Geology and Paleoclimatology Research (13 works) · Geography (12 works) · Physical geography (10 works) · Geology (8 works) · Climate change (7 works) · Climatology (7 works) · Geology (7 works) · Holocene (7 works) · Environmental Science (6 works) · Geomorphology (6 works)