Amérique du Nord ; Circulation atmosphérique ; Great Lakes ; Géographie physique ; LakeSuperior ; Pression atmosphérique ; Température ; Variation climatique
Variations in atmospheric circulation and spatial and temporal patterns of sea-level pressure anomalies over eastern North America are highly correlated in time with temperature trends in the LakeSuperior area. LakeSuperior region temperature
trends have not been the same for all seasons. January and July temperatures were highest in the mid-1930s| those for April and October culminated later. Differences in the timing of temperature peaks within the LakeSuperior region are related mainly
mainly the temperatures over the eastern part of region. About seventy to eighty percent of the temperature variance for the LakeSuperior region is related to about twenty-five to thirty percent of the pressure variance for eastern North America.
to variations in pressure anomalies over western Canada and with associated anomalous air flow components across the Lake. Pressure anomalies over the southwestern United States and opposite anomalies to the east have been less important and they have affected
Comparison of two indicators of climatic change : tree growth and LakeSuperior water supplies
Apport en eau ; Bilan hydrologique ; Dendrochronologie ; Etats-Unis ; Eté ; Géographie de l'Amérique ; Lac ; LakeSuperior ; Modèle ; Niveau lacustre ; Paléoclimatologie ; Précipitation ; Quaternaire ; Température
The purpose of this paper is to illustrate that proxy indicators do not necessarily integrate the effects of temperature and precipitation in the same manner by comparing the response of tree growth around LakeSuperior and the water supplies
to that lake to summer climate. Multiple regression models are developed to assess, in terms of common variance, the similarities and differences.
Aeolian features ; C 14 dating ; Dune ; Holocene ; Lake ; Lake level ; Michigan ; Palaeo-ecology ; Palaeosol ; Quaternary ; Stratigraphy ; United States of America
timing of periods of stability and instability along the banks, thereby providing an indirect record of changes in lake levels within the LakeSuperior basin.
This study uses soil stratigraphy and 14C dating to explore connections among lake levels, characteristics of buried soils, and Holocene dunefield evolution. If periods of high and low sediment supply occured, a record of buried soils may elucidate
Seismic reflection study of recessional moraines beneath LakeSuperior and their relationship to regional deglaciation
Amérique du Nord ; Déglaciation ; Glaciaire ; Great Lakes ; Géographie de l'Amérique ; Holocène ; LakeSuperior ; Moraine de retrait ; Quaternaire zones moyennes ; Sismique réflexion
An offlapping sequence of glacial and glacial-lacustrine sediments overlying bedrock is recognized in west-central LakeSuperior that is progressively younger to the northeast. Four facies are recognized on the basis of geomorphologic and acoustic
), and basal till (facies D). The prominent moraines of facies B are unusually thick and are believed to mark the ice-margin shorelines of successive major proglacial lakes that formerly occupied parts of western LakeSuperior. The moraines are tentatively
correlated with Glacial Lake Duluth (unit 1), Glacial Lake Washburn (unit 2), and Glacial Lake Beaver Bay (unit 3), the most prominent of lakes drained via the progressively lower outlets via the Moose Lake/Brule-St. Croix Rivers, the Huron Mountains
Seismic reflection profiles (3.5 kHz) were obtained along more than 3500 km of shiptrack in LakeSuperior within the last 2 yr. The acoustic character of profiles is categorized as: (I) a single, strong reflector at the lake floor, (II) a thick
other areas. These factors complicate sedimentation in LakeSuperior, and must be considered when investigating any aspect of the lake sediment.
preferentially in a trough between Isle Royale and the north shore, and to a lesser extent in other topographic depressions| bottom currents generated by storm waves prevent clay accumulation on till or bedrock in the open lake wherever the bottom is shallower
Optically stimulated luminescence dating of late Holocene raised strandplain sequences adjacent to Lakes Michigan and Superior, Upper Peninsula, Michigan, USA
Aeolian deposit ; C 14 dating ; Coastal environment ; Dating ; Holocene ; Lacustrine sediment ; Lake level ; Michigan ; Quaternary ; Thermoluminescence ; United States of America
This study evaluates the accuracy of optically stimulated luminescence to date well-preserved strandline sequences at Manistique Thompson bay (Lake Michigan), and Tahquamenon and Grand Traverse Bays (LakeSuperior) that span the past-4500 yr
late Holocene strandplains adjacent to large lakes or oceans and ultimately to refine and resolve water-level history.
Regeneration dynamics and genetic variability of sugar maple (Acer saccharum (Marsh.)) seedlings at the species'northern growth limit, LakeSuperior Provincial Park, Canada
The AA. examine the demographics and genetic properties of Acer saccharum seedlings across the regional and local vegetation transition in LakeSuperior Provincial Park, LSPP. Objectives are to determine if density age, size, growth and gene
Modeling of backshore slope processes during the cold season, South shore of LakeSuperior
Amérique du Nord ; Dynamique de versant ; Etats-Unis ; Glaciel ; Great Lakes ; Géographie de l'Amérique ; Humidité du sol ; Lac ; Littoral ; Modèle ; Mouvement de masse ; Pied de glace ; Processus morphogénétique ; Superior, Lac ; Température
Indigenous maps, cosmology, and spatial recognition of the North American Indian : with special reference to the Ojibway around LakeSuperior in Cosmology, epistemology and the history of geography.