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Reference TypeConference Paper (Conference Proceedings)
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Secondary KeyINPE--PRE/
Citation KeyAvelinaCunLudKocKla:2024:InSpDi
TitleIncreased spring dissolved organic carbon and nitrogen production and DOC/DON ratio decrease along the Atlantic sector of the Southern Ocean
Year2024
Access Date2024, Nov. 05
Secondary TypePRE CI
2. Context
Author1 Avelina, Raquel
2 Cunha, Letķcia Cotrim da
3 Ludwichowski, Kai-Uwe
4 Koch, Boris P.
5 Klaas, Christine
Group1
2 DIIAV-CGCT-INPE-MCTI-GOV-BR
Affiliation1 Universidade do Estado do Rio de Janeiro (UERJ)
2 Instituto Nacional de Pesquisas Espaciais (INPE)
3 Alfred-Wegener-Institut Helmholtz Zentrum für Polar - und Meeresforschung
4 Alfred-Wegener-Institut Helmholtz Zentrum für Polar - und Meeresforschung
5 Alfred-Wegener-Institut Helmholtz Zentrum für Polar - und Meeresforschung
Conference NameOpen Science Conference (SCAR), 11
Conference LocationPucón, Chile
Date19-23 aug. 2024
Book TitleProceedings
History (UTC)2024-08-28 17:03:07 :: simone -> administrator ::
2024-08-29 11:02:54 :: administrator -> simone :: 2024
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AbstractDissolved organic matter (DOM) is a component of the ocean biological pump, containing fractions of dissolved organic carbon (DOC), nitrogen (DON), and other biologically relevant elements. The role of DOM in marine systems is important for linking the carbon and nutrient cycles. Here we evaluate the seasonal DOC and DON distributions and the DOC/DON ratio in the upper 300 m of the Atlantic sector of the Southern Ocean between 2004 and 2022. We used the dataset collected aboard the RV Polarstern on cruises under umbrella of the Alfred Wegener Institute, Germany, during austral summer 2012, winter/early spring 2013 and spring 2022 as well as datasets from international repositories collected in the spring 2004 and summers 2005, 2010 and 2014. DOC and total dissolved nitrogen (TDN) were analyzed with a TOC-L® Series Shimadzu. DON was calculated by subtracting TDN and dissolved inorganic nitrogen concentrations. The austral spring presented the highest median concentrations of DOC and DON respectively, 49.8 µmol kg1 and 5.1 µmol kg1 and the lowest DOC/DON ratio (11.2). The DOC, DON and the DOC/DON ratio in spring were also statistically different from median results in winter (45.2 µmol kg1 , 3.4 µmol kg1 and 14.3) and summer (45.8 µmol kg1 , 3.6 µmol kg1 and 13.1). However, there were no differences between winter and summer conditions. The highest DOC and DON concentrations confirmed that spring is important for the DOM production and accumulation in the euphotic zone, due to the availability of light and nutrients for phytoplankton. We also corroborate studies in other sectors of the Southern Ocean showing that DOM deviates from the Redfield C/N ratio for plankton production (6.6). However, the release of nitrogen-rich organic matter by zooplankton may contribute to the DOC/DON ratio decrease in spring.
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