STARDUST II - Spatial and Temporal Assessment
of high Resolution Depth profiles Using novel Sampling Technologies The fate of pollutants in fluvial and marine sediments in cross-border zones
Sea-ice algal primary production and nitrogen uptake rates off East Antarctica
Roukaerts, A.; Cavagna, A.-J.; Fripiat, F.; Lannuzel, D.; Meiners, K.M.; Dehairs, F. (2016). Sea-ice algal primary production and nitrogen uptake rates off East Antarctica. Deep-Sea Res., Part II, Top. Stud. Oceanogr. 131: 140-149. https://dx.doi.org/10.1016/j.dsr2.2015.08.007
In: Deep-Sea Research, Part II. Topical Studies in Oceanography. Pergamon: Oxford. ISSN 0967-0645; e-ISSN 1879-0100
Antarctic pack ice comprises about 90% of the sea ice in the southern hemisphere and plays an important structuring role in Antarctic marine ecosystems, yet measurements of ice algal primary production and nitrogen uptake rates remain scarce. During the early austral spring of 2012, measurements for primary production rates and uptake of two nitrogen substrates (nitrate and ammonium) were conducted at 5 stations in the East Antarctic pack ice (63–66°S, 115–125°E). Carbon uptake was low (3.52 mg C m-2 d-1) but a trend of increased production was observed towards the end of the voyage suggesting pre-bloom conditions. Significant snow covers reaching, up to 0.8 m, induced strong light limitation. Two different regimes were observed in the ice with primarily nitrate based ‘new’ production (f-ratio: 0.80–0.95) at the bottom of the ice cover, due to nutrient-replete conditions at the ice–water interface, and common for pre-bloom conditions. In the sea-ice interior, POC:PN ratios (20–70) and higher POC:Chl a ratios suggested the presence of large amounts of detrital material trapped in the ice and here ammonium was the prevailing nitrogen substrate. This suggests that most primary production in the sea-ice interior was regenerated and supported by a microbial food web, recycling detritus.
Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid
STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders
French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)
