ee8f636c-2a40-4272-9e9f-55ba8c4e1271 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-06-23T16:15:34 creation ISO 19115 2016 Fast Repetition Rate Fluorometry (FRRF) data collected on the RV L'Astrolabe ee8f636c-2a40-4272-9e9f-55ba8c4e1271 Maximum photochemical efficiency of photosystem II (PSII), also called maximum quantum yield of PSII (Fv/Fm), has become one of the most widely utilized fluorescence parameters in phytoplankton research. It represents the potential photochemical efficiency, which is the probability that the light energy captured by the photosynthetic apparatus is being utilized as photochemistry. Fv/Fm has been shown to have an instant response to variations in physical and chemical properties and is interpreted as a diagnostic of the overall health or competence of phytoplankton. Together with the absorption cross section area of PSII and chlorophyll concentration, it can be used to measure primary production (Cheah et al. 2011, Deep Sea Research). Seawater from 3 m depth was supplied continuously from the ship’s clean seawater line. FRR fluorescence yields were measured continuously at 1 minute intervals in dark-adapted state (! 15 minutes dark-adaptation) using a flash sequence consisting of a series of 100 subsaturation flashlets (1.1 μs flash duration and 2.8 μs interflash period) and a series of 20 relaxation flashlets (1.1 μs flash duration and 51.6 μs interflash period). {"type": "Polygon", "coordinates": [[[138.7, -66.7], [159.0, -66.7], [159.0, -42.8], [138.7, -42.8], [138.7, -66.7]]]} 138.7 159.0 -66.7 -42.8 Continents | Antarctica Countries | Australia Fast Repetition Rate Fluorometer (FRRF) Global/Oceans | Southern Ocean Maximum quantum yield (Fv/Fm) Photosynthesis primary production DATA ACCESS - individual voyage data files available through the IMAS THREDDS catalogue. documentDigital HTML USER MANUAL - Theory and operation of FRRF by Suggett et al (2010). documentDigital PDF aodn:aodn_imas_fluorometry_map documentDigital MAP - Vessel tracks WMS aodn:aodn_imas_fluorometry_data documentDigital This OGC WFS service returns the data for download in subsettable CSV format. WFS aodn_imas_fluorometry_map#url documentDigital The ncUrlList is a WFS service that returns a list of URLs matching a query. HTML View and download this data through the interactive IMAS Data Portal. documentDigital HTML ORCID ID documentDigital HTML Website of the Australian Ocean Data Network (AODN) documentDigital HTML ORCID ID documentDigital HTML Unnamed resource documentDigital HTML Unnamed resource documentDigital HTML Unnamed resource documentDigital License Graphic PNG Unnamed resource documentDigital HTML