Long-term climate variability at the Prince Edward Islands in the Southern Ocean
A warming Southern Ocean (SO), due to climate change and global warming, has many implications on the sub-Antarctic Islands in the SO. Due to the distance away from continental land these islands experience an oceanic climate, making them the perfect sentinels to climate change in this sector of the...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Master Thesis |
Language: | English |
Published: |
Department of Oceanography
2021
|
Subjects: | |
Online Access: | http://hdl.handle.net/11427/36129 |
id |
ftunivcapetownir:oai:open.uct.ac.za:11427/36129 |
---|---|
record_format |
openpolar |
spelling |
ftunivcapetownir:oai:open.uct.ac.za:11427/36129 2023-12-03T10:13:46+01:00 Long-term climate variability at the Prince Edward Islands in the Southern Ocean Shangheta, Anna Liisa Penelao Tulimevava Lamont, Tarron Ansorge, Isabel Rouault, Mathieu 2021 application/pdf http://hdl.handle.net/11427/36129 eng eng Department of Oceanography Faculty of Science http://hdl.handle.net/11427/36129 Prince Edward Islands sub-Antarctic Islands Climatic changes decadal variability Master Thesis Masters MSc 2021 ftunivcapetownir 2023-11-03T00:16:26Z A warming Southern Ocean (SO), due to climate change and global warming, has many implications on the sub-Antarctic Islands in the SO. Due to the distance away from continental land these islands experience an oceanic climate, making them the perfect sentinels to climate change in this sector of the Southern Ocean. Studies have proposed that climate changes reported at the Prince Edward Islands (PEIs) correspond in time to a southward shift of the Antarctic Circumpolar Current (ACC) particularly the Subantarctic Front (SAF). While other studies have shown distinctive trends in ocean and atmospheric parameters such as sea surface temperature (SST), air temperature, sunshine, rainfall, air sea level pressure and wind speed and direction from the 1950s to the early 2000s, the aim of this study is to update those studies to a more recent time with updated time series. Among the changes recorded is an increase in SST and air temperature, which is a strong indication of the changing local and global climate. Using linear regression, this study showed that the rates of increase from 1949 to 2018 of the SST (0.022°C/year), minimum (0.0072°C/year) and maximum air temperatures (0.016°C/year) are smaller than estimated in previous studies. The increasing trend in SST and air temperature reported by previous papers has actually stopped since the 2000s, which reduces the formerly reported trend (0.028°C/year). Although the in-situ measured SST data had gaps, a good correlation with in-situ SST and large scale satellite derived Reynolds SST help to corroborate the covariation between SST, in-situ SST and air temperature giving weight to the hypothesis of a reversal of the positive temperature trends reported by others. The change in decadal variability a decrease in air pressure of 4 hPa since the late 1990s to late 2000s, which coincided with a decrease in minimum and maximum air temperatures of 1°C over the same period; decrease in westerly wind and an increase in the northerly component of the wind, which would explain the ... Master Thesis Antarc* Antarctic Prince Edward Islands Southern Ocean University of Cape Town: OpenUCT Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Prince Edward Islands sub-Antarctic Islands Climatic changes decadal variability |
spellingShingle |
Prince Edward Islands sub-Antarctic Islands Climatic changes decadal variability Shangheta, Anna Liisa Penelao Tulimevava Long-term climate variability at the Prince Edward Islands in the Southern Ocean |
topic_facet |
Prince Edward Islands sub-Antarctic Islands Climatic changes decadal variability |
description |
A warming Southern Ocean (SO), due to climate change and global warming, has many implications on the sub-Antarctic Islands in the SO. Due to the distance away from continental land these islands experience an oceanic climate, making them the perfect sentinels to climate change in this sector of the Southern Ocean. Studies have proposed that climate changes reported at the Prince Edward Islands (PEIs) correspond in time to a southward shift of the Antarctic Circumpolar Current (ACC) particularly the Subantarctic Front (SAF). While other studies have shown distinctive trends in ocean and atmospheric parameters such as sea surface temperature (SST), air temperature, sunshine, rainfall, air sea level pressure and wind speed and direction from the 1950s to the early 2000s, the aim of this study is to update those studies to a more recent time with updated time series. Among the changes recorded is an increase in SST and air temperature, which is a strong indication of the changing local and global climate. Using linear regression, this study showed that the rates of increase from 1949 to 2018 of the SST (0.022°C/year), minimum (0.0072°C/year) and maximum air temperatures (0.016°C/year) are smaller than estimated in previous studies. The increasing trend in SST and air temperature reported by previous papers has actually stopped since the 2000s, which reduces the formerly reported trend (0.028°C/year). Although the in-situ measured SST data had gaps, a good correlation with in-situ SST and large scale satellite derived Reynolds SST help to corroborate the covariation between SST, in-situ SST and air temperature giving weight to the hypothesis of a reversal of the positive temperature trends reported by others. The change in decadal variability a decrease in air pressure of 4 hPa since the late 1990s to late 2000s, which coincided with a decrease in minimum and maximum air temperatures of 1°C over the same period; decrease in westerly wind and an increase in the northerly component of the wind, which would explain the ... |
author2 |
Lamont, Tarron Ansorge, Isabel Rouault, Mathieu |
format |
Master Thesis |
author |
Shangheta, Anna Liisa Penelao Tulimevava |
author_facet |
Shangheta, Anna Liisa Penelao Tulimevava |
author_sort |
Shangheta, Anna Liisa Penelao Tulimevava |
title |
Long-term climate variability at the Prince Edward Islands in the Southern Ocean |
title_short |
Long-term climate variability at the Prince Edward Islands in the Southern Ocean |
title_full |
Long-term climate variability at the Prince Edward Islands in the Southern Ocean |
title_fullStr |
Long-term climate variability at the Prince Edward Islands in the Southern Ocean |
title_full_unstemmed |
Long-term climate variability at the Prince Edward Islands in the Southern Ocean |
title_sort |
long-term climate variability at the prince edward islands in the southern ocean |
publisher |
Department of Oceanography |
publishDate |
2021 |
url |
http://hdl.handle.net/11427/36129 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Prince Edward Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Prince Edward Islands Southern Ocean |
op_relation |
http://hdl.handle.net/11427/36129 |
_version_ |
1784260658432311296 |