Chlorophyll-a, Fv/Fm, and nutrient values for near surface waters and incubation experiment during SONNE cruise SO243
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2018
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| _version_ | 1867167676109946880 |
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| author | Browning, Thomas J |
| author_facet | Browning, Thomas J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Iron (Fe), cobalt (Co), and vitamin B12 addition experiments were performed in the eastern Equatorial Pacific/Peruvian upwelling zone during the 2015 El Niño event. Near the Peruvian coastline, apparent photosystem II photochemical efficiencies (Fv/Fm) were unchanged by nutrient addition and chlorophyll-a tripled in untreated controls over two days, indicating nutrient replete conditions. Conversely, Fe amendment further away from the coastline in the high nitrate, low Fe zone significantly increased Fv/Fm and chlorophyll-a concentrations. Mean chlorophyll-a was further enhanced following supply of Fe+Co and Fe+B12 relative to Fe alone, but this was not statistically significant; further offshore, reported Co depletion relative to Fe could enhance responses. The persistence of Fe limitation in this system under a developing El Niño, as previously demonstrated under non-El Niño conditions, suggests that diminished upwelled Fe is likely an important factor driving reductions in offshore phytoplankton productivity during these events. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_890131 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Chlorophyll-a, Fv/Fm, and nutrient values for near surface waters and incubation experiment during SONNE cruise SO243 Browning, Thomas J ASTRA-OMZ; CT; SO243; SO243-track; Sonne_2; Underway cruise track measurements Iron (Fe), cobalt (Co), and vitamin B12 addition experiments were performed in the eastern Equatorial Pacific/Peruvian upwelling zone during the 2015 El Niño event. Near the Peruvian coastline, apparent photosystem II photochemical efficiencies (Fv/Fm) were unchanged by nutrient addition and chlorophyll-a tripled in untreated controls over two days, indicating nutrient replete conditions. Conversely, Fe amendment further away from the coastline in the high nitrate, low Fe zone significantly increased Fv/Fm and chlorophyll-a concentrations. Mean chlorophyll-a was further enhanced following supply of Fe+Co and Fe+B12 relative to Fe alone, but this was not statistically significant; further offshore, reported Co depletion relative to Fe could enhance responses. The persistence of Fe limitation in this system under a developing El Niño, as previously demonstrated under non-El Niño conditions, suggests that diminished upwelled Fe is likely an important factor driving reductions in offshore phytoplankton productivity during these events. |
| title | Chlorophyll-a, Fv/Fm, and nutrient values for near surface waters and incubation experiment during SONNE cruise SO243 |
| topic | ASTRA-OMZ; CT; SO243; SO243-track; Sonne_2; Underway cruise track measurements |
| url | https://doi.org/10.1594/PANGAEA.890131 |