Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
| one publication added to basket [363046] |
Sea ice meltwater and circumpolar deep water drive contrasting productivity in three Antarctic polynyas
Moreau, S.; Lannuzel, D.; Janssens, J.; Arroyo, M.C.; Corkill, M.; Cougnon, E.; Genovese, C.; Legresy, B.; Lenton, A.; Puigcorbe, V.; Ratnarajah, L.; Rintoul, S.; Roca-Marti, M.; Rosenberg, M.; Shadwick, E.H.; Silvano, A.; Strutton, P.G.; Tilbrook, B. (2019). Sea ice meltwater and circumpolar deep water drive contrasting productivity in three Antarctic polynyas. JGR: Oceans 124(5): 2943-2968. https://dx.doi.org/10.1029/2019JC015071
In: Journal of Geophysical Research-Oceans. AMER GEOPHYSICAL UNION: Washington. ISSN 2169-9275; e-ISSN 2169-9291, meer
|  |
| Trefwoord |
|
| Author keywords |
polynyas; primary productivity; phytoplankton biomass; ice shelves; sea ice; iron |
| Auteurs | | Top |
- Moreau, S., meer
- Lannuzel, D., meer
- Janssens, J.
- Arroyo, M.C.
- Corkill, M.
- Cougnon, E.
|
- Genovese, C., meer
- Legresy, B.
- Lenton, A.
- Puigcorbe, V.
- Ratnarajah, L.
- Rintoul, S.
|
- Roca-Marti, M.
- Rosenberg, M.
- Shadwick, E.H.
- Silvano, A.
- Strutton, P.G.
- Tilbrook, B.
|
| Abstract |
In the Southern Ocean, polynyas exhibit enhanced rates of primary productivity and represent large seasonal sinks for atmospheric CO2. Three contrasting east Antarctic polynyas were visited in late December to early January 2017: the Dalton, Mertz, and Ninnis polynyas. In the Mertz and Ninnis polynyas, phytoplankton biomass (average of 322 and 354 mg chlorophyll a (Chl a)/m2, respectively) and net community production (5.3 and 4.6 mol C/m2, respectively) were approximately 3 times those measured in the Dalton polynya (average of 122 mg Chl a/m2 and 1.8 mol C/m2). Phytoplankton communities also differed between the polynyas. Diatoms were thriving in the Mertz and Ninnis polynyas but not in the Dalton polynya, where Phaeocystis antarctica dominated. These strong regional differences were explored using physiological, biological, and physical parameters. The most likely drivers of the observed higher productivity in the Mertz and Ninnis were the relatively shallow inflow of iron-rich modified Circumpolar Deep Water onto the shelf as well as a very large sea ice meltwater contribution. The productivity contrast between the three polynyas could not be explained by (1) the input of glacial meltwater, (2) the presence of Ice Shelf Water, or (3) stratification of the mixed layer. Our results show that physical drivers regulate the productivity of polynyas, suggesting that the response of biological productivity and carbon export to future change will vary among polynyas. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
