Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach
Thesis (MSc)--Stellenbosch University, 2018. ENGLISH ABSTRACT: The Southern Ocean is identified as a key component in the global carbon cycle due to a unique combination of physical circulation and biological processes. In light of a predicted changing climate, understanding in-situ environmental an...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Thesis |
Language: | English |
Published: |
Stellenbosch : Stellenbosch University
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/10019.1/104925 |
id |
ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/104925 |
---|---|
record_format |
openpolar |
spelling |
ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/104925 2023-11-12T04:26:29+01:00 Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach Weir, Ian Fietz, Susanne Stellenbosch University. Faculty of Science. Dept. of Earth Sciences. 2018-11-16T15:33:14Z 114 pages : illustrations, maps application/pdf http://hdl.handle.net/10019.1/104925 en_ZA eng Stellenbosch : Stellenbosch University http://hdl.handle.net/10019.1/104925 Stellenbosch University Phytoplankton -- Atlantic and Indian sectors -- Southern Ocean Trace metals Biogeochemistry Diatoms UCTD Thesis 2018 ftunstellenbosch 2023-10-22T07:29:09Z Thesis (MSc)--Stellenbosch University, 2018. ENGLISH ABSTRACT: The Southern Ocean is identified as a key component in the global carbon cycle due to a unique combination of physical circulation and biological processes. In light of a predicted changing climate, understanding in-situ environmental and biological processes becomes fundamentally important for improving biogeochemical models. Phytoplankton variability in the Indian and Atlantic Southern Ocean are assessed both spatially and temporally, in terms of the unique physical and chemical environments encountered in the major oceanic zones of the Southern Ocean. The approach identified the Polar Front as an important biogeochemical boundary in both summer and winter waters, separating silicic acid replete, diatom-dominated southern waters from northern waters associated with lower silicic acid concentrations and greater flagellate contribution. Summer waters along a 0 °E meridian (Atlantic Southern Ocean) were characterized by high chlorophyll-a (up to 0.56 μg/L) concentrations and bloom conditions at certain stations, which, in some instances were correlated to an influx of trace metals. Studying a suite of trace metal distributions proved to be an important additional variable in understanding phytoplankton variability, as certain metals seemed to be preferentially utilized, possibly driving underutilization of other metals, although it is unclear whether these events were mutually exclusive. Furthermore, it allowed for the association of certain trace metals to specific phytoplankton groups e.g. Zn, Mn distributions were positively correlated with diatoms. Our results indicate a complex relationship between the phytoplankton community and trace metal distribution, as it was unclear whether trace metal distributions drive the community composition or the community composition drives trace metal distributions. . Winter waters along a 30 °E meridian (Indian Southern Ocean) were characterized by deep mixed layers, limited irradiance and cold surface waters ... Thesis Southern Ocean Stellenbosch University: SUNScholar Research Repository Southern Ocean Indian |
institution |
Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
English |
topic |
Phytoplankton -- Atlantic and Indian sectors -- Southern Ocean Trace metals Biogeochemistry Diatoms UCTD |
spellingShingle |
Phytoplankton -- Atlantic and Indian sectors -- Southern Ocean Trace metals Biogeochemistry Diatoms UCTD Weir, Ian Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach |
topic_facet |
Phytoplankton -- Atlantic and Indian sectors -- Southern Ocean Trace metals Biogeochemistry Diatoms UCTD |
description |
Thesis (MSc)--Stellenbosch University, 2018. ENGLISH ABSTRACT: The Southern Ocean is identified as a key component in the global carbon cycle due to a unique combination of physical circulation and biological processes. In light of a predicted changing climate, understanding in-situ environmental and biological processes becomes fundamentally important for improving biogeochemical models. Phytoplankton variability in the Indian and Atlantic Southern Ocean are assessed both spatially and temporally, in terms of the unique physical and chemical environments encountered in the major oceanic zones of the Southern Ocean. The approach identified the Polar Front as an important biogeochemical boundary in both summer and winter waters, separating silicic acid replete, diatom-dominated southern waters from northern waters associated with lower silicic acid concentrations and greater flagellate contribution. Summer waters along a 0 °E meridian (Atlantic Southern Ocean) were characterized by high chlorophyll-a (up to 0.56 μg/L) concentrations and bloom conditions at certain stations, which, in some instances were correlated to an influx of trace metals. Studying a suite of trace metal distributions proved to be an important additional variable in understanding phytoplankton variability, as certain metals seemed to be preferentially utilized, possibly driving underutilization of other metals, although it is unclear whether these events were mutually exclusive. Furthermore, it allowed for the association of certain trace metals to specific phytoplankton groups e.g. Zn, Mn distributions were positively correlated with diatoms. Our results indicate a complex relationship between the phytoplankton community and trace metal distribution, as it was unclear whether trace metal distributions drive the community composition or the community composition drives trace metal distributions. . Winter waters along a 30 °E meridian (Indian Southern Ocean) were characterized by deep mixed layers, limited irradiance and cold surface waters ... |
author2 |
Fietz, Susanne Stellenbosch University. Faculty of Science. Dept. of Earth Sciences. |
format |
Thesis |
author |
Weir, Ian |
author_facet |
Weir, Ian |
author_sort |
Weir, Ian |
title |
Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach |
title_short |
Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach |
title_full |
Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach |
title_fullStr |
Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach |
title_full_unstemmed |
Phytoplankton variability in the Atlantic and Indian sectors of the Southern Ocean: a biogeochemical approach |
title_sort |
phytoplankton variability in the atlantic and indian sectors of the southern ocean: a biogeochemical approach |
publisher |
Stellenbosch : Stellenbosch University |
publishDate |
2018 |
url |
http://hdl.handle.net/10019.1/104925 |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://hdl.handle.net/10019.1/104925 |
op_rights |
Stellenbosch University |
_version_ |
1782340449009139712 |