Dataset: AIMS Water Quality Particulate and Dissolved Nutrient Data


Description

This data set aggregates and summarises the water quality data collected by researchers from the Australian Institute of Marine Science from 1974 until the present. It focuses on dissolved and particulate nutrients collected in and around the Great Barrier Reef, Queensland and the tropical waters of Western Australia but is not an exhaustive summary . It also contains an historical data transcribed from the reports of the Low Islands Expedition 1928-29 led by C.M. Yonge . While every effort has been made to include only high quality data, only data from 2005 onwards has accompanying quality assurance documentation.\n The data set contains the biogeochemical data from several biological oceanography expeditions (the majority led by Miles. J. Furnas) as well as the records of water quality monitoring programmes funded by both the public and private sectors. Results from a marine water quality monitoring programme funded through the Reef Rescue Plan that has been running from 2005 until the present are also archived within this dataset.\n Each collection event is called a station and is defined by time, date, latitude and longitude . Each station name is made up of an area code, and a 3 digit station number (e.g. WQM324). A guide to station nomenclature can be found . Station metadata such as latitude, longitude, sample time, accoustic depth, etc are recorded for each station. It's common for sampling to occur in the exact same location each year for long term trending. Niskin bottle samples are taken at mulitple depths at each site: the number of bottles was primarily, but not always, dependent on bottom-depth. A unique depth code identifier has been assigned to each replicate. The Niskin bottle have samples taken with minimal delay which are then filtered or frozen for laboratory analysis, giving rise to the particulate and dissolved sample types. \n \nVariables: depth, dissolved inorganic phosphate (DIP), silicate, ammonium, nitrite, nitrate, dissolved inorganic nitrogen (DIN), dissolved organic carbon (DOC), temperature, salinity, particulate nitrogen (PN), particulate phosphorus (PP), particulate organic carbon (POC), zooplankton, total dissolved nitrogen (TDN), total dissolved phosphorus (TDP), Chlorophyll a, phaeophytin, Secchi disk. Weather information is recorded on swell and wind. \n \nThe majority of stations have a associated vertical casts of CTD loggers(Conductivity, Temperature and Depth), most of which are stored by AIMS and are available upon request. Some stations such as those in the Marine Monitoring Program (stations prefixed with WQ) have time series loggers associated with them and are available upon request. \nCollection, Storage And Analysis Method For Each Analyte: \n \nHand_NH4: Unfiltered 20ml sample, processed immediately, OPA fluorescence method (post 2005) \nNH4, NO3, NO2 and PO4: 10ml filtered sample (0.45um minisart), stored frozen at -25oC, filtrate analysed on segmented flow analyser \nSi: 10ml filtered sample (0.45um minisart), stored 25oC, filtrate analysed on segmented flow analyser (reported as Si) \nTDN and TDP: 10ml filtered sample (0.45um minisart), stored frozen at -25oC, persulphate oxidation/digestion with mixture of NaOH, Boric acid and K2S2O8 in autoclave, segmented flow analyser \nDOC: 10ml filtered sample (0.45um minisart), acidified with 100ul HCl, stored in refrigerator, high temperature combustion analyser \nPN and PC: 500ml filtered onto 25mm GF/F, frozen at -25oC, high temperature combustion analyser \nPP:  250ml filtered onto 25mm GF/F, frozen at -25oC, persulphate digestion of suspended material, colorific (molybdate blue) analysis on UV-Vis spectrophotometer \nChlorophyll-a and Phaeophytin: 100ml filtered onto 25mm GF/F (~0.7um), frozen at -25oC, extraction into 10ml of acetone, read on Turner Fluorometer using acidification method \nTotal suspended solids:  Filtered onto preweighed 47mm 0.4um polycarbonate membrane filter, rinsed with Deionised Water, suspended material dried at 60oC for 12 hours, gravimetric analysis \nSalinity: 250ml unfiltered sample, stored at 5oC in screw top plastic bottle, analysed on Guildline Portasal Salinometer (temperature compensated and calibrated using OSIL standard seawater as reference) \nTemperature:  Electronic reversing thermometer attached to niskin \nSecchi Depth:  Depth at which secchi disc becomes undetectable to the naked eye\n

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