scholarly journals Sangamon and Pre-Sangamon Interglaciations in the Hudson Bay Lowlands of Manitoba

2007 ◽  
Vol 44 (3) ◽  
pp. 319-336 ◽  
Author(s):  
Lynda A. Dredge ◽  
Alan V. Morgan ◽  
Erik Nielsen
Keyword(s):  
High Pressure ◽  
North America ◽  
Global Change ◽  
Hudson Bay ◽  
Present Position ◽  
Radiocarbon Dates ◽  
Glacial Sediments ◽  
Hudson Bay Lowlands ◽  
The World ◽  
Beetle Assemblages

ABSTRACT The manuscript documents voluminous new and published stratigraphie and paléontologie data from a region unique in North America, and possibly the world, in that it has abundant natural exposures recording a long and consistent succession of Quaternary tills and fossiliferous intertill sediments. Two major non-glacial intervals have been recognized under tills. Various non-glacial sediments have been correlated using their stratigraphie position, pollen analysis, and beetle assemblages, and are found to be equivalent to the Missinaibi Formation in Ontario. Non-finite high pressure radiocarbon dates, and aspartic acid ratios on wood suggest that the uppermost and most prevalent interval is of Sangamonian age. The Sangamonian record begins and ends with cool intervals, separated by a warmer period when climates were similar to or slightly warmer than present, and when the northern treeline was near its present position. The interval began with a high glacioisostatic sea, which regressed to levels below present Hudson Bay datum. The Sundance paleosol and silt beds below the Amery till relate to an earlier interglaciation characterized by cool tundra conditions. As an analogue for predicting future global change, the record preserved in the Hudson Bay Lowlands is second to none: additional intensive research is strongly recommended.

Present and postglacial rates of uplift for glaciated northern and eastern North America derived from postglacial uplift curves

1970 ◽  
Vol 7 (2) ◽  
pp. 703-715 ◽  
Author(s):  
J. T. Andrews
Keyword(s):  
North America ◽  
Eastern North America ◽  
Hudson Bay ◽  
High Cell ◽  
Uplift Rate ◽  
Radiocarbon Dates ◽  
Marine Deposits ◽  
Maximum Value ◽  
Current Maximum ◽  
A Current

Average rates of postglacial uplift reach a maximum value of nearly 4 m 100 y−1 over southeastern Hudson Bay, and another high cell, with rates of about 2.5 m 100 y−1, lies between Bathurst Inlet and Southampton Island. Current rates of uplift are underestimated if exponential curves are fitted solely to dated raised marine deposits without considering the amount of future recovery. Rates of rebound are, instead, derived from A/t where A is uplift in the first 1000 y since deglaciation, and t is time since deglaciation. For the northwest margin of the former ice sheet coefficients of determination for rate of uplift, at specific times, as a function of distance are [Formula: see text]. Maps of rates of uplift for northern and eastern North America are presented for 8000 y B.P., 6000 y B.P. and the present day. They reveal the existence of three uplift centers and show that rates of uplift declined from a maximum of 10 to 12 m 100 y−1, immediately following deglaciation, to a current maximum of about 1.3 m 100 y−1. Agreement is satisfactory when calculated rates of uplift are compared with those derived from geological observations, radiocarbon dates, and from water-level records. A final map shows isochrones on the uplift rate of ~1 m 100 y−1. The rate dropped to this value about 10 000 y ago on the outer northwest and southeast coasts, whereas the value might not be reached for another 2000 y in southeastern Hudson Bay.

scholarly journals A synthesis of thermokarst lake water balance in high-latitude regions of North America from isotope tracers

2017 ◽  
Vol 3 (2) ◽  
pp. 118-149 ◽  
Author(s):  
Lauren A. MacDonald ◽  
Brent B. Wolfe ◽  
Kevin W. Turner ◽  
Lesleigh Anderson ◽  
Christopher D. Arp ◽  
...  
Keyword(s):  
North America ◽  
Water Balance ◽  
Lake Water ◽  
High Latitude ◽  
Future Climate Change ◽  
Hudson Bay ◽  
Hydrological Conditions ◽  
Hudson Bay Lowlands ◽  
Recent Climate ◽  
Lake Water Balance

Numerous studies utilizing remote sensing imagery and other methods have documented that thermokarst lakes are undergoing varied hydrological transitions in response to recent climate changes, from surface area expansion to drainage and evaporative desiccation. Here, we provide a synthesis of hydrological conditions for 376 lakes of mainly thermokarst origin across high-latitude North America. We assemble surface water isotope compositions measured during the past decade at five lake-rich landscapes including Arctic Coastal Plain (Alaska), Yukon Flats (Alaska), Old Crow Flats (Yukon), northwestern Hudson Bay Lowlands (Manitoba), and Nunavik (Quebec). These landscapes represent the broad range of thermokarst environments by spanning gradients in meteorological, permafrost, and vegetation conditions. An isotope framework was established based on flux-weighted long-term averages of meteorological conditions for each lake to quantify water balance metrics. The isotope composition of source water and evaporation-to-inflow ratio for each lake were determined, and the results demonstrated a substantial array of regional and subregional diversity of lake hydrological conditions. Controls on lake water balance and how these vary among the five landscapes and with differing environmental drivers are assessed. Findings reveal that lakes in the Hudson Bay Lowlands are most vulnerable to evaporative desiccation, whereas those in Nunavik are most resilient. However, we also identify the complexity in predicting hydrological responses of these thermokarst landscapes to future climate change.

scholarly journals The Emerging Global Tobacco Treatment Workforce: Characteristics of Tobacco Treatment Specialists Trained in Council-Accredited Training Programs from 2017 to 2019

2021 ◽  
Vol 18 (5) ◽  
pp. 2416
Author(s):  
Christine E. Sheffer ◽  
Abdulmohsen Al-Zalabani ◽  
Andrée Aubrey ◽  
Rasha Bader ◽  
Claribel Beltrez ◽  
...  
Keyword(s):  
North America ◽  
Tobacco Use ◽  
Training Programs ◽  
Systems Of Care ◽  
Eastern Mediterranean ◽  
Annual Number ◽  
Treatment Services ◽  
Tobacco Treatment ◽  
The World ◽  
Academic Settings

Tobacco use is projected to kill 1 billion people in the 21st century. Tobacco Use Disorder (TUD) is one of the most common substance use disorders in the world. Evidence-based treatment of TUD is effective, but treatment accessibility remains very low. A dearth of specially trained clinicians is a significant barrier to treatment accessibility, even within systems of care that implement brief intervention models. The treatment of TUD is becoming more complex and tailoring treatment to address new and traditional tobacco products is needed. The Council for Tobacco Treatment Training Programs (Council) is the accrediting body for Tobacco Treatment Specialist (TTS) training programs. Between 2016 and 2019, n = 7761 trainees completed Council-accredited TTS training programs. Trainees were primarily from North America (92.6%) and the Eastern Mediterranean (6.1%) and were trained via in-person group workshops in medical and academic settings. From 2016 to 2019, the number of Council-accredited training programs increased from 14 to 22 and annual number of trainees increased by 28.5%. Trainees have diverse professional backgrounds and work in diverse settings but were primarily White (69.1%) and female (78.7%) located in North America. Nearly two-thirds intended to implement tobacco treatment services in their setting; two-thirds had been providing tobacco treatment for 1 year or less; and 20% were sent to training by their employers. These findings suggest that the training programs are contributing to the development of a new workforce of TTSs as well as the development of new programmatic tobacco treatment services in diverse settings. Developing strategies to support attendance from demographically and geographically diverse professionals might increase the proportion of trainees from marginalized groups and regions of the world with significant tobacco-related inequities.

Notes on Power Operated Controls for Large Aircraft

1945 ◽  
Vol 49 (410) ◽  
pp. 51-54
Author(s):  
A. Gouge
Keyword(s):  
North America ◽  
North Atlantic ◽  
The North ◽  
The World ◽  
The North Atlantic ◽  
Large Aircraft

A Study of the air routes of the world brings out almost at once the fact that some of the most difficult route are also the most attractive. For instance, the North Atlantic route which couples North America with Europe is certainly one of the most difficult in the world, but also by the fact that it couples two of the most densely populated, as well as the most wealthy groups of people in the world, one of the most attractive.

scholarly journals The duration of the active phase on surge-type glaciers: contrasts between Svalbard and other regions

1991 ◽  
Vol 37 (127) ◽  
pp. 388-400 ◽  
Author(s):  
Julian A. Dowdeswell ◽  
Gordon S. Hamilton ◽  
Jon Ove Hagen
Keyword(s):  
Time Series ◽  
North America ◽  
Active Phase ◽  
Aerial Photographs ◽  
Polar Ice ◽  
Phase Duration ◽  
Field Surveys ◽  
The World ◽  
Glacier Surges ◽  
Fast Motion

AbstractMany glaciers in Svalbard and in other glacierized areas of the world are known to surge. However, the time series of observations required to assess the duration of fast motion is very restricted. Data on active-phase duration in Svalbard come from aerial photographs, satellite imagery, field surveys and airborne reconnaissance. Evidence on surge duration is available for eight Svalbard ice masses varying from 3 to 1250 km2. Worldwide, active-phase duration is recorded for less than 50 glaciers. Few observations are available on high polar ice masses. The duration of the active phase is significantly longer for Svalbard glaciers than for surge-type glaciers in other areas from which data are available. In Svalbard, the active phase may last from 3 to 10 years. By contrast, a surge duration of 1–2 years is more typical of ice masses in northwest North America, Iceland and the Pamirs. Ice velocities during the protracted active phase on Svalbard glaciers are considerably lower than those for many surge-type glaciers in these other regions. Mass is transferred down-glacier more slowly but over a considerably longer period. Svalbard surge-type glaciers do not exhibit the very abrupt termination of the active phase, over periods of a few days, observed for several Alaskan glaciers. The duration of the active phase in Svalbard is not dependent on parameters related to glacier size. The quiescent phase is also relatively long (50–500 years) for Svalbard ice masses. Detailed field monitoring of changing basal conditions through the surge cycle is required from surge-type glaciers in Svalbard in order to explain the significantly longer length of the active phase for glaciers in the archipelago, which may also typify other high polar ice masses. The finding that surge behaviour, in the form of active-phase duration, shows systematic differences between different regions and their environments has important implications for understanding the processes responsible for glacier surges.

scholarly journals Digging Into the World Beneath Our Feet: Bridging Across Scales in the Age of Global Change

Eos ◽  
2014 ◽  
Vol 95 (11) ◽  
pp. 96-97 ◽  
Author(s):  
Eve-Lyn S. Hinckley ◽  
William Wieder ◽  
Noah Fierer ◽  
Eldor Paul
Keyword(s):  
Global Change ◽  
The World

Constraining the age of the last interglacial–glacial transition in the Hudson Bay lowlands (Canada) using U–Th dating of buried wood

2012 ◽  
Vol 7 ◽  
pp. 37-47 ◽  
Author(s):  
G. Allard ◽  
M. Roy ◽  
B. Ghaleb ◽  
P.J.H. Richard ◽  
A.C. Larouche ◽  
...  
Keyword(s):  
Hudson Bay ◽  
Last Interglacial ◽  
Hudson Bay Lowlands

The Shari’a Approach to Contemporary Problems of Mass Surveillance

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Sattam Eid Almutairi
Keyword(s):  
North America ◽  
Personal Data ◽  
Legal Systems ◽  
Legal Norms ◽  
Muslim Countries ◽  
Norms And Values ◽  
The World ◽  
State Surveillance ◽  
Mass Surveillance ◽  
Do So

AbstractThe phenomenon of mass surveillance has confronted legal systems throughout the world with significant challenges to their fundamental norms and values. These dilemmas have been most extensively studied and discussed in relation to the kind of privacy cultures that exist in Europe and North America. Although mass surveillance creates the same kinds of challenges in Muslim countries, the phenomenon has rarely been discussed from the perspective of Shari’a. This article seeks to demonstrate that this neglect of mass surveillance and other similar phenomena by Shari’a scholars is unjustified. Firstly, the article will address objections that Shari’a does not contain legal norms that are relevant to the modern practice of state surveillance and that, if these exist, they are not binding on rulers and will also seek to show that, whatever terminology is employed, significant aspects of the protection of privacy and personal data that exists in other legal systems is also be found deeply-rooted in Shari’a. Secondly, it will assess the specific requirements that it makes in relation to such intrusion on private spaces and private conduct and how far it can benefit from an exception to the general prohibition on spying. Finally, it is concluded that mass surveillance is unlikely to meet these Shari’a requirements and that only targeted surveillance can generally do so.

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