Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice
The relationship between the production of dimethylsulfide (DMS) in the upper ocean and atmospheric sulfate aerosols has been confirmed through local shipboard measurements, and global modeling studies alike. In order to examine whether such a connection may be recoverable in the satellite record, w...
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American Geophysical Union
2005
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:77570 2023-05-15T13:59:53+02:00 Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice Gabric, Albert J. Shephard, Jill M. Knight, Jon M. Jones, Graham Trevena, Anne J. Meinrat O. Andreae 2005-12-01 https://espace.library.uq.edu.au/view/UQ:77570 eng eng American Geophysical Union doi:10.1029/2005GB002546 issn:0886-6236 issn:1944-9224 Environmental aciences Geosciences multidisciplinary Meteorology and atmospheric sciences Antarctic circumpolar current 291003 Photogrammetry and Remote Sensing C1 770304 Physical and chemical conditions Journal Article 2005 ftunivqespace https://doi.org/10.1029/2005GB002546 2020-11-02T23:25:01Z The relationship between the production of dimethylsulfide (DMS) in the upper ocean and atmospheric sulfate aerosols has been confirmed through local shipboard measurements, and global modeling studies alike. In order to examine whether such a connection may be recoverable in the satellite record, we have analyzed the correlation between mean surface chlorophyll (CHL) and aerosol optical depth (AOD) in the Southern Ocean, where the marine atmosphere is relatively remote from anthropogenic and continental influences. We carried out the analysis in 5-degree zonal bands between 50 degrees S and 70 degrees S, for the period ( 1997 - 2004), and in smaller meridional sectors in the Eastern Antarctic, Ross and Weddell seas. Seasonality is moderate to strong in both CHL and AOD signatures throughout the study regions. Coherence in the CHL and AOD time series is strong in the band between 50 degrees S and 60 degrees S, however this synchrony is absent in the sea-ice zone (SIZ) south of 60 degrees S. Marked interannual variability in CHL occurs south of 60 degrees S, presumably related to variability in sea-ice production during the previous winter. We find a clear latitudinal difference in the cross correlation between CHL and AOD, with the AOD peak preceding the CHL bloom by up to 6 weeks in the SIZ. This suggests that substantial trace gas emissions ( aerosol precursors) are being produced over the SIZ in spring ( October - December) as sea ice melts. This hypothesis is supported by field data that record extremely high levels of sulfur species in sea ice, surface seawater, and the overlying atmosphere during ice melt. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean The University of Queensland: UQ eSpace Antarctic Southern Ocean Weddell Global Biogeochemical Cycles 19 4 n/a n/a |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Environmental aciences Geosciences multidisciplinary Meteorology and atmospheric sciences Antarctic circumpolar current 291003 Photogrammetry and Remote Sensing C1 770304 Physical and chemical conditions |
spellingShingle |
Environmental aciences Geosciences multidisciplinary Meteorology and atmospheric sciences Antarctic circumpolar current 291003 Photogrammetry and Remote Sensing C1 770304 Physical and chemical conditions Gabric, Albert J. Shephard, Jill M. Knight, Jon M. Jones, Graham Trevena, Anne J. Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice |
topic_facet |
Environmental aciences Geosciences multidisciplinary Meteorology and atmospheric sciences Antarctic circumpolar current 291003 Photogrammetry and Remote Sensing C1 770304 Physical and chemical conditions |
description |
The relationship between the production of dimethylsulfide (DMS) in the upper ocean and atmospheric sulfate aerosols has been confirmed through local shipboard measurements, and global modeling studies alike. In order to examine whether such a connection may be recoverable in the satellite record, we have analyzed the correlation between mean surface chlorophyll (CHL) and aerosol optical depth (AOD) in the Southern Ocean, where the marine atmosphere is relatively remote from anthropogenic and continental influences. We carried out the analysis in 5-degree zonal bands between 50 degrees S and 70 degrees S, for the period ( 1997 - 2004), and in smaller meridional sectors in the Eastern Antarctic, Ross and Weddell seas. Seasonality is moderate to strong in both CHL and AOD signatures throughout the study regions. Coherence in the CHL and AOD time series is strong in the band between 50 degrees S and 60 degrees S, however this synchrony is absent in the sea-ice zone (SIZ) south of 60 degrees S. Marked interannual variability in CHL occurs south of 60 degrees S, presumably related to variability in sea-ice production during the previous winter. We find a clear latitudinal difference in the cross correlation between CHL and AOD, with the AOD peak preceding the CHL bloom by up to 6 weeks in the SIZ. This suggests that substantial trace gas emissions ( aerosol precursors) are being produced over the SIZ in spring ( October - December) as sea ice melts. This hypothesis is supported by field data that record extremely high levels of sulfur species in sea ice, surface seawater, and the overlying atmosphere during ice melt. |
author2 |
Meinrat O. Andreae |
format |
Article in Journal/Newspaper |
author |
Gabric, Albert J. Shephard, Jill M. Knight, Jon M. Jones, Graham Trevena, Anne J. |
author_facet |
Gabric, Albert J. Shephard, Jill M. Knight, Jon M. Jones, Graham Trevena, Anne J. |
author_sort |
Gabric, Albert J. |
title |
Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice |
title_short |
Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice |
title_full |
Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice |
title_fullStr |
Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice |
title_full_unstemmed |
Correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the Southern Ocean: Evidence for the influence of sea ice |
title_sort |
correlations between the satellite-derived seasonal cycle of phytoplankton biomass and aerosol optical depth in the southern ocean: evidence for the influence of sea ice |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
https://espace.library.uq.edu.au/view/UQ:77570 |
geographic |
Antarctic Southern Ocean Weddell |
geographic_facet |
Antarctic Southern Ocean Weddell |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
doi:10.1029/2005GB002546 issn:0886-6236 issn:1944-9224 |
op_doi |
https://doi.org/10.1029/2005GB002546 |
container_title |
Global Biogeochemical Cycles |
container_volume |
19 |
container_issue |
4 |
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1766268809013886976 |