Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas
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 polyny...
| Authors: | ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; |
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| Format: | Article |
| Publication date: | 2019 |
| Country: | España |
| Institution: | Universitat Autònoma de Barcelona |
| Repository: | Dipòsit Digital de Documents de la UAB |
| Language: | English |
| OAI Identifier: | oai:ddd.uab.cat:307048 |
| Online Access: | https://ddd.uab.cat/record/307048 https://dx.doi.org/urn:doi:10.1029/2019JC015071 |
| Access Level: | Open access |
| Keyword: | Ice shelves Iron Phytoplankton biomass Polynyas Primary productivity Sea ice |
| _version_ | 1878739110823198720 |
|---|---|
| author | Moreau, Sebastien|||0000-0001-9446-812X |
| author2 | Lannuzel, Delphine|||0000-0001-6154-1837 Janssens, Julie|||0000-0003-1789-9940 Arroyo, Mar C.|||0000-0002-9794-5750 Corkill, Matthew|||0000-0002-5847-3738 Cougnon, Eva|||0000-0002-8691-5935 Genovese, Cristina|||0000-0002-9015-020X Legresy, Benoit|||0000-0002-1909-1630 Lenton, Andrew|||0000-0001-9437-8896 Puigcorbé, Viena|||0000-0001-5892-2305 Ratnarajah, Lavenia|||0000-0002-1021-1923 Rintoul, Stephen|||0000-0002-7055-9876 Roca-Martí, Montserrat|||0000-0002-4719-9358 Rosenberg, Mark|||0000-0003-1862-9790 Shadwick, Elizabeth H.|||0000-0003-4008-3333 Silvano, Alessandro|||0000-0002-6441-1496 Strutton, Peter G.|||0000-0002-2395-9471 Tilbrook, Bronte|||0000-0001-9385-3827 |
| author2_role | author author author author author author author author author author author author author author author author author |
| author_browse | Arroyo, Mar C.|||0000-0002-9794-5750 Corkill, Matthew|||0000-0002-5847-3738 Cougnon, Eva|||0000-0002-8691-5935 Genovese, Cristina|||0000-0002-9015-020X Janssens, Julie|||0000-0003-1789-9940 Lannuzel, Delphine|||0000-0001-6154-1837 Legresy, Benoit|||0000-0002-1909-1630 Lenton, Andrew|||0000-0001-9437-8896 Moreau, Sebastien|||0000-0001-9446-812X Puigcorbé, Viena|||0000-0001-5892-2305 Ratnarajah, Lavenia|||0000-0002-1021-1923 Rintoul, Stephen|||0000-0002-7055-9876 Roca-Martí, Montserrat|||0000-0002-4719-9358 Rosenberg, Mark|||0000-0003-1862-9790 Shadwick, Elizabeth H.|||0000-0003-4008-3333 Silvano, Alessandro|||0000-0002-6441-1496 Strutton, Peter G.|||0000-0002-2395-9471 Tilbrook, Bronte|||0000-0001-9385-3827 |
| author_facet | Moreau, Sebastien|||0000-0001-9446-812X Lannuzel, Delphine|||0000-0001-6154-1837 Janssens, Julie|||0000-0003-1789-9940 Arroyo, Mar C.|||0000-0002-9794-5750 Corkill, Matthew|||0000-0002-5847-3738 Cougnon, Eva|||0000-0002-8691-5935 Genovese, Cristina|||0000-0002-9015-020X Legresy, Benoit|||0000-0002-1909-1630 Lenton, Andrew|||0000-0001-9437-8896 Puigcorbé, Viena|||0000-0001-5892-2305 Ratnarajah, Lavenia|||0000-0002-1021-1923 Rintoul, Stephen|||0000-0002-7055-9876 Roca-Martí, Montserrat|||0000-0002-4719-9358 Rosenberg, Mark|||0000-0003-1862-9790 Shadwick, Elizabeth H.|||0000-0003-4008-3333 Silvano, Alessandro|||0000-0002-6441-1496 Strutton, Peter G.|||0000-0002-2395-9471 Tilbrook, Bronte|||0000-0001-9385-3827 |
| author_role | author |
| collection | Dipòsit Digital de Documents de la UAB |
| description | 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_bb4bbdcc3b2c38ee7ceff3abb8a822a3 |
| institution | Universitat Autònoma de Barcelona |
| instname_str | Universitat Autònoma de Barcelona |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:ddd.uab.cat:307048 |
| publishDate | 2019 |
| publishDateSort | 2019 |
| reponame_str | Dipòsit Digital de Documents de la UAB |
| spelling | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas Moreau, Sebastien|||0000-0001-9446-812X Lannuzel, Delphine|||0000-0001-6154-1837 Janssens, Julie|||0000-0003-1789-9940 Arroyo, Mar C.|||0000-0002-9794-5750 Corkill, Matthew|||0000-0002-5847-3738 Cougnon, Eva|||0000-0002-8691-5935 Genovese, Cristina|||0000-0002-9015-020X Legresy, Benoit|||0000-0002-1909-1630 Lenton, Andrew|||0000-0001-9437-8896 Puigcorbé, Viena|||0000-0001-5892-2305 Ratnarajah, Lavenia|||0000-0002-1021-1923 Rintoul, Stephen|||0000-0002-7055-9876 Roca-Martí, Montserrat|||0000-0002-4719-9358 Rosenberg, Mark|||0000-0003-1862-9790 Shadwick, Elizabeth H.|||0000-0003-4008-3333 Silvano, Alessandro|||0000-0002-6441-1496 Strutton, Peter G.|||0000-0002-2395-9471 Tilbrook, Bronte|||0000-0001-9385-3827 Ice shelves Iron Phytoplankton biomass Polynyas Primary productivity Sea ice 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. https://ddd.uab.cat/record/307048 https://dx.doi.org/urn:doi:10.1029/2019JC015071 |
| spellingShingle | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas Moreau, Sebastien|||0000-0001-9446-812X Ice shelves Iron Phytoplankton biomass Polynyas Primary productivity Sea ice |
| title | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas |
| title_full | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas |
| title_fullStr | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas |
| title_full_unstemmed | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas |
| title_short | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas |
| title_sort | Sea Ice Meltwater and Circumpolar Deep Water Drive Contrasting Productivity in Three Antarctic Polynyas |
| topic | Ice shelves Iron Phytoplankton biomass Polynyas Primary productivity Sea ice |
| topic_facet | Ice shelves Iron Phytoplankton biomass Polynyas Primary productivity Sea ice |
| url | https://ddd.uab.cat/record/307048 https://dx.doi.org/urn:doi:10.1029/2019JC015071 |