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Browning, Thomas (2018): Chlorophyll-a, Fv/Fm, and nutrient values for near surface waters and incubation experiment during SONNE cruise SO243. PANGAEA,, Supplement to: Browning, Thomas; Rapp, Insa; Schlosser, Christian; Gledhill, Martha; Achterberg, Eric Pieter; Bracher, Astrid; Le Moigne, Frédéric A C (2018): Influence of iron, cobalt, and vitamin B12 supply on phytoplankton growth in the tropical East Pacific during the 2015 El Niño. Geophysical Research Letters,

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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.
Median Latitude: -9.581187 * Median Longitude: -79.489011 * South-bound Latitude: -22.073620 * West-bound Longitude: -85.500000 * North-bound Latitude: 0.847120 * East-bound Longitude: -71.241660
Date/Time Start: 2015-10-05T23:00:00 * Date/Time End: 2015-10-21T17:05:00
SO243-track * Latitude Start: -0.999000 * Longitude Start: -85.500000 * Latitude End: -15.318000 * Longitude End: -75.274000 * Date/Time Start: 2015-10-07T00:00:00 * Date/Time End: 2015-10-20T00:00:00 * Campaign: SO243 (ASTRA-OMZ) * Basis: Sonne_2 * Method/Device: Underway cruise track measurements (CT)
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