On the biogeochemical processes controlling trace metal distributions in the Canadian Arctic Ocean and Arctic rivers
department or school: Science, Faculty of
department or school: Earth, Ocean and Atmospheric Sciences, Department of
data provider: DSpace
degree campus: UBCV
creator: Colombo, Manuel
issued: 2019-11-28T17:35:25Z
issued: 2019
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: This PhD thesis describes some of the first distributions of lead, iron and manganese in the Canadian Arctic Ocean and other multiple trace metals in remote rivers in the Canadian Arctic Archipelago (CAA), unraveling the processes which modulate their distributions. A clear spatial variability in the distributions of dissolved aluminum, iron, manganese, nickel, copper, zinc, cadmium and lead was observed in small CAA rivers, which reflects differences in bedrock geology and South-North environmental gradients (e.g., solar radiation, precipitation, temperature) in the Archipelago. The concentrations of many trace metals from these small CAA rivers are considerably higher than those measured in Canada Basin waters, and therefore they have the potential to be a significant source of metals to transiting waters to adjacent coastal areas. Dissolved lead concentrations in the Canadian Arctic Ocean were among the lowest reported concentrations in ocean waters, attributed to the isolation of this region from anthropogenic inputs. Nonetheless, distinctive high and anthropogenically derived lead features, advected from the northeast Subarctic Pacific and the Labrador Sea, were observed in this study. The natural cycling of lead in the Canadian Arctic Ocean is primarily controlled by an interaction of glacial and sea ice melt water inputs, and scavenging throughout the water column and especially at the sediment water interface. Contrary to lead distributions, dissolved iron and manganese (DFe and DMn) concentrations measured in the Canadian Arctic Ocean were within the range of those reported for major basins. In our study the highest DFe and DMn concentrations were generally found in surface and subsurface waters. This is attributed to large riverine inputs present in this region and to continental shelf sediment fluxes. A dynamic interplay between removal processes and inputs of these trace metals largely control their vertical distribution below 300 m. Advective sources ar…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/72466
note: ON THE BIOGEOCHEMICAL PROCESSES CONTROLLING TRACE METAL DISTRIBUTIONS IN THE CANADIAN ARCTIC OCEAN AND ARCTIC RIVERS by Manuel Colombo B.Sc., National University of La Plata, 2012 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Oceanography) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) November 2019 © Manuel Colombo, 2019 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: On the Biogeochemical processes Controlling Trace Metal Distributions in the Canadian Arctic Ocean and Arctic Rivers submitted by Manuel Colombo in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Oceanography Examining Committee: Kristin Orians Supervisor Susan Allen Supervisory Committee Member Maria T. Maldonado Supervisory Committee Member Madjid Mohseni University Examiner Ulrich Mayer University Examiner Additional Supervisory Committee Members: Roger Francois Supervisory Committee Member iii Abstract This PhD thesis describes some of the first distributions of lead, iron and manganese in the Canadian Arctic Ocean and other multiple trace metals in remote rivers in the Canadian Arctic Archipelago (CAA), unraveling the processes which modulate their distributions. A clear spatial variability in the distributions of dissolved aluminum, iron, manganese, nickel, copper, zinc, cadmium and lead was observed in small CAA rivers, which reflects differences in bedrock geology and South-North environmental gradients (e.g., solar radiation, precipitation, temperature) in the Archipelago. The concentrations of many trace metals from these small CAA rivers are considerably higher than those measured in Canada Basin waters, and therefore they have the potential to be a significant source of metals to transiting waters to adjacent coastal areas. Dissolved…
has type: Thesis/Dissertation
date issued: 2020-05
is shown at: 10.14288/1.0386025
language: eng
degree discipline: Oceanography
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/72466