Quaternary temperatures and precipitation for the north-west coast of North America

Nature ◽  
1980 ◽  
Vol 286 (5774) ◽  
pp. 702-704 ◽  
Author(s):  
C. J. Heusser ◽  
L. E. Heusser ◽  
S. S. Streeter
Keyword(s):  
North America ◽  
West Coast ◽  
North West ◽  
The North

Journal of a Voyage on the North West Coast of North America during the Years 1811, 1812, 1813 and 1814

1971 ◽  
Vol 58 (1) ◽  
pp. 148
Author(s):  
John E. Sunder ◽  
Gabriel Franchere ◽  
W. Kaye Lamb ◽  
Wessie Tipping Lamb
Keyword(s):  
North America ◽  
West Coast ◽  
North West ◽  
The North

The Scottish Herring Trade, 1470–1600

2005 ◽  
Vol 84 (2) ◽  
pp. 149-165 ◽  
Author(s):  
Martin Rorke
Keyword(s):  
Sixteenth Century ◽  
West Coast ◽  
North West ◽  
Capital Costs ◽  
The North ◽  
East And West

This paper uses customs figures to show that herring exports from the east and west coast lowlands expanded significantly in the last six decades of the sixteenth century. The paper argues that the rise was primarily due to the north-west Highland fisheries being opened up and exploited by east and west coast burghs. These ventures required greater capital supplies and more complex organisation than their local inshore fisheries and they were often interrupted by political hostilities. However, the costs were a fraction of those required to establish a deepwater buss fleet, enabling Scotland to expand production and take advantage of European demand for fish while minimising additional capital costs.

scholarly journals Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
Otman EL Mountassir ◽  
Mohammed Bahir ◽  
Driss Ouazar ◽  
Abdelghani Chehbouni ◽  
Paula M. Carreira
Keyword(s):  
Groundwater Recharge ◽  
West Coast ◽  
Exchange Process ◽  
Environmental Isotopes ◽  
Annual Rainfall ◽  
Groundwater Salinization ◽  
Rock Interaction ◽  
North West ◽  
The North ◽  
Water Rock Interaction

AbstractThe city of Essaouira is located along the north-west coast of Morocco, where groundwater is the main source of drinking, domestic and agricultural water. In recent decades, the salinity of groundwater has increased, which is why geochemical techniques and environmental isotopes have been used to determine the main sources of groundwater recharge and salinization. The hydrochemical study shows that for the years 1995, 2007, 2016 and 2019, the chemical composition of groundwater in the study area consists of HCO3–Ca–Mg, Cl–Ca–Mg, SO4–Ca and Cl–Na chemical facies. The results show that from 1995 to 2019, electrical conductivity increased and that could be explained by a decrease in annual rainfall in relation to climate change and water–rock interaction processes. Geochemical and environmental isotope data show that the main geochemical mechanisms controlling the hydrochemical evolution of groundwater in the Cenomanian–Turonian aquifer are the water–rock interaction and the cation exchange process. The diagram of δ2H = 8 * δ18O + 10 shows that the isotopic contents are close or above to the Global Meteoric Water Line, which suggests that the aquifer is recharged by precipitation of Atlantic origin. In conclusion, groundwater withdrawal should be well controlled to prevent groundwater salinization and further intrusion of seawater due to the lack of annual groundwater recharge in the Essaouira region.

Sign in / Sign up

Export Citation Format

Share Document