Division of the waters: changing concepts of the continental divide, 1804–1844

One of the major features of the continental geography of North America that was still misunderstood at the beginning of the nineteenth century was the drainage system between the Mississippi River and the Pacific. At the beginning of the century, Americans thought of the drainage system as symmetrical, with all major streams heading in a common source region and flowing in several directions to the Mississippi, the Arctic, the Pacific and the Gulf of California. The desired water route across the continent was based upon this view. During the first half of the nineteenth century the concept of the common source region and the water route underwent revision. Geographical information from early explorers like Lewis and Clark and Pike reinforced the older theories but gradually gave way before more accurate data acquired by the men of the Rocky Mountain fur trade. The fur trade lore was tested by John Charles Frémont in the 1840's and a new image was developed, one of a continental divide rather than a common source region. Although the idea of a commercial route across the continent still persisted after Frémont, it was viewed as a land route, crossing the Continental Divide at South Pass, rather than one by water.     

Extreme weather events in northeastern New Brunswick (Canada) for the period 1950–2012: Comparison of newspaper archive and weather station data

In the context of global warming, changes in extreme weather and climate events are expected, particularly those associated with changes in temperature and precipitation regimes and those that will affect coastal areas. The main objectives of this study were to establish the number of extreme events that have occurred in northeastern New Brunswick, Canada in recent history, and to determine whether their occurrence has increased. By using archived regional newspapers and data from three meteorological stations in a national network, the frequency of extreme events in the study area was established for the time period 1950–2012. Of the 282 extreme weather events recorded in the newspaper archives, 70% were also identified in the meteorological time series analysis. The discrepancy might be explained by the synergistic effect of co‐occurring non‐extreme events, and increased vulnerability over time, resulting from more people and infrastructure being located in coastal hazard zones. The Mann Kendall and Pettitt statistical tests were used to identify trends and the presence of break points in the weather data time series. Results indicate a statistically significant increase in average temperatures and in the number of extreme events, such as extreme hot days, as well as an increase in total annual and extreme precipitation. A significant decrease in the number of frost‐free days and extreme cold days was also found, in addition to a decline in the number of dry days.