Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer
Surface bio-optical constituents (Chl-a, light-absorption coefficient of phytoplankton (aph (443)), detritus (ad(443)), coloured dissolved organic matter (aCDOM(443))), and hydrographic variables were studied across the fronts along 57.5°E during 2011, 2013 and 2015 in the Indian sector of Southern...
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ftnipr:oai:nipr.repo.nii.ac.jp:00017407 2023-07-16T04:00:36+02:00 Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer 2023-06 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=17407 http://id.nii.ac.jp/1291/00017263/ en eng https://doi.org/10.1016/j.polar.2023.100944 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=17407 http://id.nii.ac.jp/1291/00017263/ Polar Science, 36, 100944(2023-06) 18739652 CDOM remineralisation Phytoplankton absorption Package effect Ocean colour Southern Ocean Journal Article 2023 ftnipr https://doi.org/10.1016/j.polar.2023.100944 2023-06-24T19:39:17Z Surface bio-optical constituents (Chl-a, light-absorption coefficient of phytoplankton (aph (443)), detritus (ad(443)), coloured dissolved organic matter (aCDOM(443))), and hydrographic variables were studied across the fronts along 57.5°E during 2011, 2013 and 2015 in the Indian sector of Southern Ocean to understand their interannual variability and phytoplankton pigment package effect. Latitudinal increases of Chl-a, aph(443), and aCDOM(443) were observed in 2011 and 2013. Mean Chl-a was higher in 2013 than in 2015 and 2011. The Chl-a specific absorption (a*ph(443)) latitudinally decreased implying ‘pigment package effect’ with increasing latitude. Interannually increase of aph blue (443)/red (675) ratio suggested higher non-photosynthetic absorption during 2013 and 2015 than in 2011. The relative contributions of bio-optical constituents to total absorption (at) showed interannual decrease in aph(443) and increase in aCDOM(443) and ad(443) inferring phytoplankton growth and decay phases. The robust aph(443)-Chl-a relationship during 2011 was used to derive aph(443) for other years, which holds good for in situ and satellite-derived counterparts. aCDOM(443) positively correlated with Chl-a and negatively with CDOM-spectral slope (S300-500), suggesting autochthonous sources. Satellite-retrieved Chl-a, aph(443) showed significant correlation (p < 0.001) with in situ data. This study provides baseline bio-optical data for understanding phytoplankton size-class, and improvement of bio-optical algorithms in this relatively inaccessible polar region. Article in Journal/Newspaper Polar Science Polar Science Southern Ocean National Institute of Polar Research Repository, Japan Austral Indian Southern Ocean Polar Science 36 100944 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
CDOM remineralisation Phytoplankton absorption Package effect Ocean colour Southern Ocean |
spellingShingle |
CDOM remineralisation Phytoplankton absorption Package effect Ocean colour Southern Ocean Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer |
topic_facet |
CDOM remineralisation Phytoplankton absorption Package effect Ocean colour Southern Ocean |
description |
Surface bio-optical constituents (Chl-a, light-absorption coefficient of phytoplankton (aph (443)), detritus (ad(443)), coloured dissolved organic matter (aCDOM(443))), and hydrographic variables were studied across the fronts along 57.5°E during 2011, 2013 and 2015 in the Indian sector of Southern Ocean to understand their interannual variability and phytoplankton pigment package effect. Latitudinal increases of Chl-a, aph(443), and aCDOM(443) were observed in 2011 and 2013. Mean Chl-a was higher in 2013 than in 2015 and 2011. The Chl-a specific absorption (a*ph(443)) latitudinally decreased implying ‘pigment package effect’ with increasing latitude. Interannually increase of aph blue (443)/red (675) ratio suggested higher non-photosynthetic absorption during 2013 and 2015 than in 2011. The relative contributions of bio-optical constituents to total absorption (at) showed interannual decrease in aph(443) and increase in aCDOM(443) and ad(443) inferring phytoplankton growth and decay phases. The robust aph(443)-Chl-a relationship during 2011 was used to derive aph(443) for other years, which holds good for in situ and satellite-derived counterparts. aCDOM(443) positively correlated with Chl-a and negatively with CDOM-spectral slope (S300-500), suggesting autochthonous sources. Satellite-retrieved Chl-a, aph(443) showed significant correlation (p < 0.001) with in situ data. This study provides baseline bio-optical data for understanding phytoplankton size-class, and improvement of bio-optical algorithms in this relatively inaccessible polar region. |
format |
Article in Journal/Newspaper |
title |
Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer |
title_short |
Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer |
title_full |
Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer |
title_fullStr |
Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer |
title_full_unstemmed |
Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer |
title_sort |
interannual variability of surface bio-optical characteristics in the frontal zones of the indian sector of the southern ocean during austral summer |
publishDate |
2023 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=17407 http://id.nii.ac.jp/1291/00017263/ |
geographic |
Austral Indian Southern Ocean |
geographic_facet |
Austral Indian Southern Ocean |
genre |
Polar Science Polar Science Southern Ocean |
genre_facet |
Polar Science Polar Science Southern Ocean |
op_relation |
https://doi.org/10.1016/j.polar.2023.100944 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=17407 http://id.nii.ac.jp/1291/00017263/ Polar Science, 36, 100944(2023-06) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2023.100944 |
container_title |
Polar Science |
container_volume |
36 |
container_start_page |
100944 |
_version_ |
1771549572320985088 |