Phytoplankton photosynthetic competence, underway data of SOIREE cruise track 1999-02-08 to 1999-02-24 ...

• Main Authors: Boyd, Philip W, Abraham, Edward R
• Format: Dataset
• Language: English
• Published: PANGAEA 2001
• Subjects: DATE/TIME; DEPTH, water; Fluorescence, chlorophyll; Photosynthetic competence; Radiation, photosynthetically active; Underway cruise track measurements; Fluorometer, Chelsea Instruments; Fast repetition rate fluorometry FRRF Kolber & Falkowski, 1993; Quantum Irradiance Meter, LI-COR Inc.; SOIREE; Tangaroa; Joint Global Ocean Flux Study JGOFS; Pacific; Southern Ocean; Subarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.121468; https://doi.pangaea.de/10.1594/PANGAEA.121468

Active fluorescence (fast repetition rate fluorometry, FRRF) was used to follow the photosynthetic response of the phytoplankton community during the 13-day Southern Ocean Iron RElease Experiment (SOIREE). This in situ iron enrichment was conducted in the polar waters of the Australasian-Pacific sector of the Southern Ocean in February 1999. Iron fertilisation of these high nitrate low chlorophyll (HNLC) waters resulted in an increase in the photosynthetic competence (Fv/Fm) of the resident cells from around 0.20 to greater than 0.60 (i.e. close to the theoretical maximum) by 10/11 days after the first enrichment. Although a significant iron-mediated response in Fv/Fm was detected as early as 24 h after the initial fertilisation, the increase in Fv/Fm to double ambient levels took 6 days. This response was five-fold slower than observed in iron enrichments (in situ and in vitro) in the HNLC waters of the subarctic and equatorial Pacific. Although little is known about the relationship between water ... : Uncalibrated fluorescence data from ships data-acquisition system (DAS). Position not given. ...