Trend and recovery of the total ozone column in South America and Antarctica
South America is one of the most vulnerable areas to stratospheric ozone depletion; consequently, an increased amount of UV radiation reaches the Earth's surface in this region. In this study, we analyzed the long-term trend in the total ozone column (TOC) over the southern part of the South Am...
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ftunivchile:oai:repositorio.uchile.cl:2250/148362 2023-05-15T13:41:41+02:00 Trend and recovery of the total ozone column in South America and Antarctica Toro Araya, Richard Araya, Consuelo Labra O., Felipe Morales Salinas, Luis Morales, Raúl Leiva Guzmán, Manuel 2017 application/pdf https://doi.org/10.1007/s00382-017-3540-1 https://repositorio.uchile.cl/handle/2250/148362 en eng Springer Clim Dyn (2017) 49:3735–3752 doi:10.1007/s00382-017-3540-1 https://repositorio.uchile.cl/handle/2250/148362 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Climate Dynamics Total ozone column Long term trend analysis Theil Sen estimator Decadal variation Multiple linear regression Artículo de revista 2017 ftunivchile https://doi.org/10.1007/s00382-017-3540-1 2023-01-22T01:05:56Z South America is one of the most vulnerable areas to stratospheric ozone depletion; consequently, an increased amount of UV radiation reaches the Earth's surface in this region. In this study, we analyzed the long-term trend in the total ozone column (TOC) over the southern part of the South American continent from 1980 to 2009. The database used was obtained by combining several satellite measurements of the TOC on a 1A degrees (latitude) x 1.25A degrees (longitude) grid. Analysis of the long-term trend was performed by applying the Theil-Sen estimator and the Mann-Kendall significance test to the deseasonalized time series. The long-term trend was also analyzed over several highly populated urban zones in the study area. Finally, multiple linear regression (MLR) modeling was used to identify and quantify the drivers of interannual variability in the TOC over the study area with a pixel-by-pixel approach. The results showed a decrease in the TOC ranging from -0.3 to -4% dec(-1) from 1980 to 2009. On a decadal timescale, there is significant variability in this trend, and a decrease of more than -10% dec(-1) was found at high latitudes (1980-1989). However, the trends obtained over much of the study area were not statistically significant. Considering the period from 1980 to 1995, we found a decrease in the TOC of -2.0 +/- 0.6% dec(-1) at latitudes below 40A degrees S and -6.9 +/- 2.0% dec(-1) at latitudes above 40A degrees S, for a 99.9% confidence level over most of the study area. Analysis of the period from 1996 to 2009 showed a statistically significant increase of 2.3 +/- 0.1% dec(-1) at high latitudes (> 60A degrees S), confirming the initial TOC recovery in the Antarctic. Despite evidence for initial recovery of the TOC in some parts of the study area between 1996 and 2009, the long-term increase from September to November is not yet statistically significant. In addition, large parts of the study area and most of the urban areas continue to show a decreasing trend in the TOC. The MLR results show ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Universidad de Chile: Repositorio académico Antarctic The Antarctic Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) Climate Dynamics 49 11-12 3735 3752 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Total ozone column Long term trend analysis Theil Sen estimator Decadal variation Multiple linear regression |
spellingShingle |
Total ozone column Long term trend analysis Theil Sen estimator Decadal variation Multiple linear regression Toro Araya, Richard Araya, Consuelo Labra O., Felipe Morales Salinas, Luis Morales, Raúl Leiva Guzmán, Manuel Trend and recovery of the total ozone column in South America and Antarctica |
topic_facet |
Total ozone column Long term trend analysis Theil Sen estimator Decadal variation Multiple linear regression |
description |
South America is one of the most vulnerable areas to stratospheric ozone depletion; consequently, an increased amount of UV radiation reaches the Earth's surface in this region. In this study, we analyzed the long-term trend in the total ozone column (TOC) over the southern part of the South American continent from 1980 to 2009. The database used was obtained by combining several satellite measurements of the TOC on a 1A degrees (latitude) x 1.25A degrees (longitude) grid. Analysis of the long-term trend was performed by applying the Theil-Sen estimator and the Mann-Kendall significance test to the deseasonalized time series. The long-term trend was also analyzed over several highly populated urban zones in the study area. Finally, multiple linear regression (MLR) modeling was used to identify and quantify the drivers of interannual variability in the TOC over the study area with a pixel-by-pixel approach. The results showed a decrease in the TOC ranging from -0.3 to -4% dec(-1) from 1980 to 2009. On a decadal timescale, there is significant variability in this trend, and a decrease of more than -10% dec(-1) was found at high latitudes (1980-1989). However, the trends obtained over much of the study area were not statistically significant. Considering the period from 1980 to 1995, we found a decrease in the TOC of -2.0 +/- 0.6% dec(-1) at latitudes below 40A degrees S and -6.9 +/- 2.0% dec(-1) at latitudes above 40A degrees S, for a 99.9% confidence level over most of the study area. Analysis of the period from 1996 to 2009 showed a statistically significant increase of 2.3 +/- 0.1% dec(-1) at high latitudes (> 60A degrees S), confirming the initial TOC recovery in the Antarctic. Despite evidence for initial recovery of the TOC in some parts of the study area between 1996 and 2009, the long-term increase from September to November is not yet statistically significant. In addition, large parts of the study area and most of the urban areas continue to show a decreasing trend in the TOC. The MLR results show ... |
format |
Article in Journal/Newspaper |
author |
Toro Araya, Richard Araya, Consuelo Labra O., Felipe Morales Salinas, Luis Morales, Raúl Leiva Guzmán, Manuel |
author_facet |
Toro Araya, Richard Araya, Consuelo Labra O., Felipe Morales Salinas, Luis Morales, Raúl Leiva Guzmán, Manuel |
author_sort |
Toro Araya, Richard |
title |
Trend and recovery of the total ozone column in South America and Antarctica |
title_short |
Trend and recovery of the total ozone column in South America and Antarctica |
title_full |
Trend and recovery of the total ozone column in South America and Antarctica |
title_fullStr |
Trend and recovery of the total ozone column in South America and Antarctica |
title_full_unstemmed |
Trend and recovery of the total ozone column in South America and Antarctica |
title_sort |
trend and recovery of the total ozone column in south america and antarctica |
publisher |
Springer |
publishDate |
2017 |
url |
https://doi.org/10.1007/s00382-017-3540-1 https://repositorio.uchile.cl/handle/2250/148362 |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) |
geographic |
Antarctic The Antarctic Kendall |
geographic_facet |
Antarctic The Antarctic Kendall |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Climate Dynamics |
op_relation |
Clim Dyn (2017) 49:3735–3752 doi:10.1007/s00382-017-3540-1 https://repositorio.uchile.cl/handle/2250/148362 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1007/s00382-017-3540-1 |
container_title |
Climate Dynamics |
container_volume |
49 |
container_issue |
11-12 |
container_start_page |
3735 |
op_container_end_page |
3752 |
_version_ |
1766153814548676608 |