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  • 1
    Electronic Resource
    Electronic Resource
    Increased urinary excretion of Al after drinking tea (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 122-122 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-It is well known that urinary aluminium excretion increases after ingestion of aluminium-containing antacid preparations'. Discussion about the dietary intake of aluminium from tea2 4 would be helped by data on the bioavailability of Al known to be present in tea leaves. We determined the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/333122a0
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Coastal water quality monitoring along the South African coastline in 2016 and 2017, with in situ T-S-O2-pH and laboratory chlorophyll-a, phosphate and nitrate measurements (2017)
    PANGAEA
    In:  Department of Environmental Affairs
    Details
    Publication Date: 2023-03-14
    Description: The first comprehensive survey of basic physico-chemical water quality parameters along the South African coastline was carried out from 2016 to 2017, at more than 200 sampling sites. The west coast (Port Nolloth to Cape Town) was sampled 3 times, to establish seasonal variability associated with upwelling. The south- and east coasts (Cape Town to Sodwana) was sampled twice, to capture the influence of river runoff during high versus low river runoff conditions. The data can be used to assist with the revision of existing Water Quality Guidelines, which at present is inadequate due to a lack of comprehensive baseline data for these water quality parameters. The data also suggest areas of concern and that may be prone to land-based sources of pollution and eutrophication, and acidification, that will be discussed in more detail in manuscripts to be finalised.
    Keywords: Chlorophyll a; DATE/TIME; DEPTH, water; LATITUDE; Location; LONGITUDE; Nitrate; Oxygen; pH; Phosphate; Salinity; Sample ID; South_African_coastline; South Africa; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 4032 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Biogeochemical climatology for the Southern Benguela Upwelling System, constructed from in situ monthly monitoring data collected from 2001 to 2012 (2017)
    PANGAEA
    In:  Department of Environmental Affairs
    Details
    Publication Date: 2023-01-13
    Description: A biogeochemical monthly climatology had been constructed for the Southern Benguela Upwelling System, from in situ data collected along a 10 station monitoring line, sampled at monthly intervals from 2001 to 2012. The monitoring line reaches a maximum offshore distance of about 150 km, with monitoring station depths ranging from 27 to 392 m. In addition to temperature, salinity and oxygen CTD profile data (at 1 m depth resolution), monitoring data for the macro-nutrients (phosphate, nitrate, nitrite, silicate) and chlorophyll-a, obtained from bottle samples, are available at 3 to 9 depths at each station. This climatology provides valuable data of biogeochemical cycles in eastern boundary upwelling systems, and will be particularly useful for the purpose of validating ocean models.
    Keywords: Benguela Upwelling; Chlorophyll a; DEPTH, water; Event label; Latitude of event; Longitude of event; MON; Monitoring; Nitrate and Nitrite; Oxygen; Phosphate; Salinity; SBUS_St-01; SBUS_St-02; SBUS_St-03; SBUS_St-04; SBUS_St-05; SBUS_St-06; SBUS_St-07; SBUS_St-08; SBUS_St-09; SBUS_St-10; Silicate; Station label; Temperature, water; Time coverage
    Type: Dataset
    Format: text/tab-separated-values, 67550 data points
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    DATA PANGAEA
  • 4
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    Micro-fibre content of South Africa's sandy beach sediments from 2016 to 2017 (2017)
    PANGAEA
    In:  Department of Environmental Affairs | Supplement to: de Villiers, Stephanie (2018): Quantification of microfibre levels in South Africa's beach sediments, and evaluation of spatial and temporal variability from 2016 to 2017. Marine Pollution Bulletin, 135, 481-489, https://doi.org/10.1016/j.marpolbul.2018.07.058
    Details
    Publication Date: 2023-01-13
    Description: In 2016 and 2017 the Department of Environmental Affairs conducted sampling at more than 150 sandy beach sites along the South African coastline, to quantify the extent of micro-plastic pollution at an average spatial sampling scale of about 15 km. Most of the sites along the west coast were sampled 3 times, to investigate seasonal variability. The east and south coasts were sampled twice, during low and higher river runoff conditions, respectively. At all sites, plastic micro-fibres were found to be the dominant micro-plastic constituents present, and the quantitative data for that is presented in this dataset. One of the problematic issues related to comparison of global micro-plastic pollutant levels, presently, is the lack of agreed to measurement methodologies and reporting units. This dataset represents results for samples taken along the high-level water mark, as a composite sample of about 1 L consisting of aliquots taken from at least 3 different sampling spots, sampled to a depth of 5 cm. The micro-fibre count is reported as the number of fibres per liter (or #F/dm3). In order to convert this to other units for comparison with other studies, sediment dry bulk density measurements are included. Data is also provided for the dominant sediment grain size (fine sand is 63 to 250 µm, and medium-coarse sand 250 µm to 1 mm) , and the temperature and salinity of surf-zone water at the time of sampling.
    Keywords: DATE/TIME; Density, dry bulk; DEPTH, water; LATITUDE; Location; LONGITUDE; Microplastic abundance; Salinity; Sample ID; Size fraction 0.250-0.063 mm, finer sand; Size fraction 1.000-0.250 mm, medium coarse sand; South_African_coastline; South Africa; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 2743 data points
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    DATA PANGAEA
  • 5
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    Seawater biogeochemical measurements (nutrients, chlorophyll-a and pCO2) from high-resolution underway sampling across the Agulhas Bank in 2014 and 2015 (2017)
    PANGAEA
    In:  Department of Environmental Affairs
    Details
    Publication Date: 2023-01-13
    Description: Underway water supply systems on modern research vessels allow for easy access to a continuous supply of near-surface seawater samples, that can be sampled inline and continuously, or discretely. Such sampling strategies are under-utilized and can provide data valuable for comparison with satellite observations of surface ocean properties, and investigation of sub-mesoscale variability and processes. This dataset represents two transects across the Agulhas Bank, a critical ocean area positioned at the southern tip of Africa, between the southern extremities of the Benguela and Agulhas Currents. On both transects discrete water sampling was carried out at 15 to 20-minute time intervals, while the ship was underway, for analysis of dissolved nutrients and chlorophyll-a; inline measurements for temperature, salinity and pCO2 were noted at each discrete water sampling point. The first transect was carried out on board the R/V SA Agulhas II in April 2014, and the second on board the R/V Algoa, in April 2015. The underway pCO2 data should be treated this caution, as the accuracy of the onboard calibration cannot be guaranteed; the data for pCO2 is included regardless, since the trends are potentially useful and interesting qualitatively.
    Keywords: Agulhas_Bank; Carbon dioxide, partial pressure; Chlorophyll a; DATE/TIME; DEPTH, water; LATITUDE; LONGITUDE; Nitrate; Nitrite; Phosphate; Salinity; Sample ID; Silicate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 4257 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Monitoring of spatial and temporal variability in bottom water oxygen levels on the Southern Benguela continental shelf, from 2014 to 2017 (2017)
    PANGAEA
    In:  Department of Environmental Affairs
    Details
    Publication Date: 2023-01-13
    Description: There is increasing evidence for a global trend towards lower seawater dissolved oxygen levels, which poses a threat to marine ecosystem health. A particular concern is upwelling areas, such as the Benguela Upwelling System, that is predisposed to low oxygen levels with occasional catastrophic consequences for fisheries resources. In the Southern Benguela Upwelling System, the lowest seawater O2 levels are typically found in inshore bottom waters at relatively shallow depths on the shelf. In order to better understand the factors inducing low oxygen conditions, temporal trends, and to provide input to the Department of Environmental Affairs' annual State of the Oceans and Coasts Report, oxygen data had been collected approximately 3-monthly along 4 transects, since 2014. To this dataset had been added data collected on a random sampling grid in the vicinity of the monitoring lines. The dissolved oxygen, temperature and salinity data represent stations at a maximum depth of about 500 m, for cruises conducted on the R/V Algoa in: August 2014 (AUG14), October 2014 (OCT14), February 2015 (FEB15), May 2015 (MAY15), September 2015 (SEP15), November 2015 (NOV15), February 2016 (FEB16), May 2016 (MAY16), August 2016 (AUG16), November 2016 (NOV16), February 2017 (FEB17) and May 2017 (MAY17).
    Keywords: Benguela Upwelling; Benguela Upwelling System; C11059; C11060; C11061; C11062; C11063; C11065; C11066; C11067; C11068; C11069; C11070; C11071; C11072; C11073; C11074; C11075; C11076; C11077; C11078; C11079; C11081; C11082; C11083; C11084; C11086; C11087; C11088; C11089; C11090; C11091; C11092; C11093; C11094; C11095; C11096; C11097; C11098; C11099; C11100; C11101; C11102; C11103; C11104; C11105; C11106; C11107; C11110; C11111; C11112; C11113; C11305; C11306; C11307; C11307a; C11307b; C11308; C11309; C11310; C11311; C11312; C11313; C11314; C11315; C11317; C11318; C11319; C11320; C11321; C11322; C11323; C11324; C11325; C11326; C11327; C11328; C11329; C11330; C11331; C11332; C11333; C11334; C11335; C11336; C11337; C11338; C11339; C11683; C11684; C11685; C11686; C11687; C11688; C11689; C11690; C11692; C11693; C11694; C11695; C11696; C11697; C11698; C11700; C11701; C11702; C11703; C11704; C11705; C11706; C11707; C11708; C11709; C11710; C11711; C11712; C11713; C11714; C11715; C11716; C11717; C11718; C11719; C11720; C11721; C11722; C11723; C11724; C11725; CTD/Rosette; CTD-RO; DEPTH, water; Elevation of event; Event label; KML01; KML02; KML03; KML04; KML05; KML06; KML07; KML08; Latitude of event; Longitude of event; NML01; NML02; NML03; NML04; NML05; NML06; NML07; Oxygen; Pressure, water; Salinity; SHBML01; SHBML02; SHBML03; SHBML04; SHBML05; SHBML06; SHBML07; SHBML08; SHBML09; SHBML10; SML01; SML02; SML03; SML04; SML05; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 255242 data points
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    DATA PANGAEA
  • 7
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    Hydrography and biogeochemistry during S.A. Agulhas II cruise Agu011, in the SW Indian Ocean, April 2014 (2015)
    PANGAEA
    In:  Supplement to: de Villiers, Stephanie; Siswana, Khaya; Vena, Kanyisile (2015): In situ measurement of the biogeochemical properties of Southern Ocean mesoscale eddies in the Southwest Indian Ocean, April 2014. Earth System Science Data, 7(2), 415-422, https://doi.org/10.5194/essd-7-415-2015
    Details
    Publication Date: 2024-05-22
    Description: Several open-ocean mesoscale features, a "young" warm-core (or anti-cyclonic) eddy at 52°S, an "older" warm-core eddy at 57.5°S, as well as an adjacent cold-core (or cyclonic) eddy at 56°S, were surveyed during a R/V S.A. Agulhas II cruise in April 2014. The main aim of the survey was to obtain hydrographical and biogeochemical profile data for contrasting open-ocean eddies in the Southern Ocean, that will be suitable for comparison and modelling of their heat, salt and nutrient characteristics, and the changes that occur in these properties as warm-core eddies migrate from the polar front southwards into the Southern Ocean. A total of 18 CTD stations were occupied in a sector south of the South-West Indian Ridge, along three transects crossing several mesoscale features identified from satellite altimetry data prior to the cruise.
    Keywords: -; Agu011; AM00264; AM00265; AM00266; AM00267; AM00268; AM00269; AM00270; AM00271; AM00272; AM00273; AM00274; AM00275; AM00276; AM00277; AM00281; AM00282; AM00283; AM00284; Chlorophyll a; Comment of event; CTD/Rosette; CTD-RO; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; Fluorescence, chlorophyll; Indian Ocean; Latitude of event; Longitude of event; Nitrate; Nitrite; Oxygen; Phosphate; Pressure, water; S. A. Agulhas II; Salinity; Silicate; Temperature, water; Temperature, water, potential; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 520803 data points
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    DATA PANGAEA
  • 8
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    An intensity ratio calibration method for the accurate determination of Mg/Ca and Sr/Ca of marine carbonates by ICP-AES (2002)
    AGU (American Geophysical Union)
    In:  Geochemistry, Geophysics, Geosystems, 3 (1). 2001GC000169.
    Details
    Publication Date: 2019-03-13
    Description: An inductively coupled plasma‐atomic emission spectroscopy (ICP‐AES) method for the accurate and precise simultaneous measurement of the Mg/Ca and Sr/Ca content of carbonates was established. While a precision of 〈0.3% (1σ standard deviation (SD)) is easily obtainable for both Mg/Ca and Sr/Ca analysis, a Ca matrix effect complicates achieving similar levels of accuracy with conventional calibration procedures. An alternative ratio calibration procedure is proposed which overcomes the Ca matrix effects and ensures the accuracy of the Mg/Ca and Sr/Ca analysis of marine carbonates to 〈0.3%, almost an order of magnitude better than conventional calibration methods. The longer‐term precision is 〈0.1% if the batch run average values are corrected for longer‐term drift. The method is suitable for analysis of foraminiferal calcite and coral aragonite and can easily be adjusted for the analysis of other carbonates or microsamples.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2001GC000169
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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