Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania
In Tasmania, most salts in the landscape originate from rainfall and accumulate in landscapes after evaporation occurs. The distribution and quantity of salt in rainfall from an array of bulk deposition collectors in the Greater Tamar Catchment were assessed for the period September 2013 to August 2...
Published in: | Australian Journal of Earth Sciences |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://researchprofiles.canberra.edu.au/en/publications/60a37b5e-e6ed-460c-825b-c0a4a0bfab0f https://doi.org/10.1080/08120099.2016.1212400 http://www.scopus.com/inward/record.url?scp=84981274818&partnerID=8YFLogxK |
id |
ftcanberrauncris:oai:pure.atira.dk:publications/60a37b5e-e6ed-460c-825b-c0a4a0bfab0f |
---|---|
record_format |
openpolar |
spelling |
ftcanberrauncris:oai:pure.atira.dk:publications/60a37b5e-e6ed-460c-825b-c0a4a0bfab0f 2023-05-15T18:25:41+02:00 Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania Sweeney, M. E. MOORE, Leah McQueen, K. G. Spandler, T. 2017-11-17 https://researchprofiles.canberra.edu.au/en/publications/60a37b5e-e6ed-460c-825b-c0a4a0bfab0f https://doi.org/10.1080/08120099.2016.1212400 http://www.scopus.com/inward/record.url?scp=84981274818&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Sweeney , M E , MOORE , L , McQueen , K G & Spandler , T 2017 , ' Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania ' , Australian Journal of Earth Sciences , vol. 64 , no. 8 , pp. 1085-1096 . https://doi.org/10.1080/08120099.2016.1212400 article 2017 ftcanberrauncris https://doi.org/10.1080/08120099.2016.1212400 2022-10-31T06:46:23Z In Tasmania, most salts in the landscape originate from rainfall and accumulate in landscapes after evaporation occurs. The distribution and quantity of salt in rainfall from an array of bulk deposition collectors in the Greater Tamar Catchment were assessed for the period September 2013 to August 2014. The bulk deposition samples were analysed for pH, electrical conductivity, major ions (Ca, Mg, Na, SO 4 and Cl) and a selection of trace ions. The average salt flux across the study area was 79 ± 10 kg/ha/yr region, ranging from 170 ± 12 kg/ha/yr near the coast in the north to 42 ± 6 kg/ha/yr inland. Deposition of most ions decreased from the northwest to the south and east, and peaked in winter and spring. Geomorphic factors such as elevation and topography have an important effect on the volume of rainfall and flux of salt from windblown dust and oceanic aerosols. A comparison of measured chloride and salt deposition in Tasmania with other Australian atmospheric studies indicates that continental-scale models of salt flux are not appropriate for Tasmania. New models are proposed that take into account the influence of the Southern Ocean, Tasman Sea and topographic variation in the study area. The results provide improved estimates of rainfall-derived salt inputs to catchments in northeast Tasmania and enable more accurate salt budget modelling. Improved understanding of volumes and distribution of salts has implications for the management of soils and infrastructure that degrade as a result of dryland salinity in Tasmania. Article in Journal/Newspaper Southern Ocean University of Canberra Research Portal Southern Ocean Australian Journal of Earth Sciences 64 8 1085 1096 |
institution |
Open Polar |
collection |
University of Canberra Research Portal |
op_collection_id |
ftcanberrauncris |
language |
English |
description |
In Tasmania, most salts in the landscape originate from rainfall and accumulate in landscapes after evaporation occurs. The distribution and quantity of salt in rainfall from an array of bulk deposition collectors in the Greater Tamar Catchment were assessed for the period September 2013 to August 2014. The bulk deposition samples were analysed for pH, electrical conductivity, major ions (Ca, Mg, Na, SO 4 and Cl) and a selection of trace ions. The average salt flux across the study area was 79 ± 10 kg/ha/yr region, ranging from 170 ± 12 kg/ha/yr near the coast in the north to 42 ± 6 kg/ha/yr inland. Deposition of most ions decreased from the northwest to the south and east, and peaked in winter and spring. Geomorphic factors such as elevation and topography have an important effect on the volume of rainfall and flux of salt from windblown dust and oceanic aerosols. A comparison of measured chloride and salt deposition in Tasmania with other Australian atmospheric studies indicates that continental-scale models of salt flux are not appropriate for Tasmania. New models are proposed that take into account the influence of the Southern Ocean, Tasman Sea and topographic variation in the study area. The results provide improved estimates of rainfall-derived salt inputs to catchments in northeast Tasmania and enable more accurate salt budget modelling. Improved understanding of volumes and distribution of salts has implications for the management of soils and infrastructure that degrade as a result of dryland salinity in Tasmania. |
format |
Article in Journal/Newspaper |
author |
Sweeney, M. E. MOORE, Leah McQueen, K. G. Spandler, T. |
spellingShingle |
Sweeney, M. E. MOORE, Leah McQueen, K. G. Spandler, T. Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania |
author_facet |
Sweeney, M. E. MOORE, Leah McQueen, K. G. Spandler, T. |
author_sort |
Sweeney, M. E. |
title |
Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania |
title_short |
Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania |
title_full |
Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania |
title_fullStr |
Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania |
title_full_unstemmed |
Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania |
title_sort |
geomorphic controls on deposition of salt in the greater tamar catchment, northeast tasmania |
publishDate |
2017 |
url |
https://researchprofiles.canberra.edu.au/en/publications/60a37b5e-e6ed-460c-825b-c0a4a0bfab0f https://doi.org/10.1080/08120099.2016.1212400 http://www.scopus.com/inward/record.url?scp=84981274818&partnerID=8YFLogxK |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Sweeney , M E , MOORE , L , McQueen , K G & Spandler , T 2017 , ' Geomorphic controls on deposition of salt in the Greater Tamar Catchment, northeast Tasmania ' , Australian Journal of Earth Sciences , vol. 64 , no. 8 , pp. 1085-1096 . https://doi.org/10.1080/08120099.2016.1212400 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1080/08120099.2016.1212400 |
container_title |
Australian Journal of Earth Sciences |
container_volume |
64 |
container_issue |
8 |
container_start_page |
1085 |
op_container_end_page |
1096 |
_version_ |
1766207293423091712 |