Reanalysis-driven climate simulation over CORDEX North America domain using the Canadian Regional Climate Model, version 5: model performance evaluation

The performance of reanalysis-driven Canadian Regional Climate Model, version 5 (CRCM5) in reproducing the present climate over the North American COordinated Regional climate Downscaling EXperiment domain for the 1989–2008 period has been assessed in comparison with several observation-based datasets. The model reproduces satisfactorily the near-surface temperature and precipitation characteristics over most part of North America. Coastal and mountainous zones remain problematic: a cold bias (2–6 °C) prevails over Rocky Mountains in summertime and all year-round over Mexico; winter precipitation in mountainous coastal regions is overestimated. The precipitation patterns related to the North American Monsoon are well reproduced, except on its northern limit. The spatial and temporal structure of the Great Plains Low-Level Jet is well reproduced by the model; however, the night-time precipitation maximum in the jet area is underestimated. The performance of CRCM5 was assessed against earlier CRCM versions and other RCMs. CRCM5 is shown to have been substantially improved compared to CRCM3 and CRCM4 in terms of seasonal mean statistics, and to be comparable to other modern RCMs.

Peak Last Glacial weathering intensity on the North American continent recorded by the authigenic Hf isotope composition of North Atlantic deep-sea sediments

We have retrieved radiogenic hafnium (Hf) isotope compositions (ɛHf) from authigenic Fe–Mn oxyhydroxides of deep northwest Atlantic sediments deposited over the past 26 ka to investigate the oceanic evidence of changes in dissolved weathering inputs from NE America during the last deglaciation. The extraction of seawater-derived Hf isotopic compositions from Fe–Mn oxyhydroxides is not a standard procedure. Comparisons between the Al/Hf ratios and Hf isotopic compositions of the chemically extracted authigenic phase on the one hand, and those of the corresponding detrital fractions on the other, provide evidence that the composition of past seawater has been reliably obtained for most sampled depths with our leaching procedures. This is endorsed most strongly by data for a sediment core from 4250 m water depth at the deeper Blake Ridge, for which consistent replicates were produced throughout. The Hf isotopic composition of the most recent sample in this core also closely matches that of nearby present day central North Atlantic seawater. Comparison with previously published seawater Nd and Pb isotope compositions obtained on the same cores shows that both Hf and Pb were released incongruently during incipient chemical weathering, but responded differently to the deglacial retreat of the Laurentide Ice Sheet. Hafnium was released more congruently during peak glacial conditions of the Last Glacial Maximum (LGM) and changed to typical incongruent interglacial ɛHf signatures either during or shortly after the LGM. This indicates that some zircon-derived Hf was released to seawater during the LGM. Conversely, there is no clear evidence for an increase in the influence of weathering of Lu-rich mineral phases during deglaciation, possibly since relatively unradiogenic Hf contributions from feldspar weathering were superimposed. While the authigenic Pb isotope signal in the same marine sediment samples traced peak chemical weathering rates on continental North America during the transition to the Holocene a similar incongruent excursion is notably absent in the Hf isotope record. The early change towards more radiogenic ɛHf in relation to the LGM may provide direct evidence for the transition from a cold-based to a warm-based Laurentide Ice Sheet on the Atlantic sector of North America.

Material culture of the Chilcotin Athapaskans of west central British Columbia : collections in the Field Museum of Natural History / James W. VanStone.

n.s. no.20(1993)

Ethnographic collections from the Assiniboine and Yanktonai Sioux in the Field Museum of Natural History / James W. VanStone.

n.s. no.26(1996)

The Isaac Cowie collection of Plains Cree material culture from Central Alberta / James W. VanStone.

n.s. no.17(1991)

The Cherry collection of Deg Hit'an (Ingalik) material culture / James W. VanStone.

n.s. no.27(1996)

Traditions of the Arapaho, collected under the auspices of the Field Columbian museum and of the American museum of natural history, by George A. Dorsey -- and Alfred L. Kroeber --

v.5(1903)

"And he was beautiful" : contemporary Athapaskan material culture in the collections of Field Museum of Natural History / William E. Simeone, James W. VanStone.

n.s. no.10(1986)

Indian trade ornaments in the collections of Field Museum of Natural History / James W. VanStone.

n.s. no.13(1989)

The Simms collection of Southwestern Chippewa material culture / James W. VanStone.

n.s. no.11(1988)

Records of the Debating Club of Resident Graduates, 1792-1793

This journal contains minutes from meetings held from February 1792 through October 1793. These minutes include the names of participants and the questions and arguments which were debated, including: whether or not French slaves in the West Indies should be emancipated; whether or not reading novels was beneficial; whether sermons were more effective when memorized than when simply read; whether theater contributed to corrupt morals; whether drunkenness or gambling was more detrimental to society; and whether or not French assistance to the colonies in their Revolutionary War provided sufficient cause for the United States to join with France in its own wars. Most of the topics of debate centered on religion, government and education. Several entries also include notes on related topics of discussion, including the reasons for Native American tribes' hostilities against federal authorities, and there are several references to published works which were cited and consulted in the course of debate.

Letter book : manuscript, 1764-1771

Tryon's official letter book containing copies of letters and documents relating to his work as colonial governor of North Carolina; with references concerning drawing a boundary between North Carolina and South Carolina; talks with the Cherokee Indians; the establishment of a postal service; working with the Propagation of the Gospels in Foreign Parts; establishing the Church of England in North Carolina; strengthening the defenses of the colony; maintaining better communication with Great Britain; and other events.

Voyage et campagnes au Canada / par M. le chevalier de D. L. P. : manuscript, 1757-1760

Describes his voyage to Canada from Brest, and his observations of military operations and Indians while in Louisbourg, Québec, and Fort Carillon.

Journal of the British expedition from Detroit to Vincennes and its defeat by George Rogers Clark : manuscript, 1778-1782

Account of the British forces' expedition which captured Vincennes, Indiana in Dec. 1778, with an account of their eventual defeat in 1779 at the Battle of Vincennes by the American Revolutionary forces led by Col. George Rogers Clark.

Relation de ce qui s'est passé en Canada depuis le départ des vaissaux de l'année 1694 jusq'au départ des vaisseaux 1695 : manuscript, [not before 1695]

Mentions Governor-General Louis de Frontenac, Antoine de Lamothe Cadillac, commandant of the Michilimackinac station, and the Iroquois Indian tribe.