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  • 1
    Electronic Resource
    Electronic Resource
    In situ acoustic measurements of marine gravel threshold and transport (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 36 (1989), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Measurements of the nearbed turbulent current flow and the bedload transport of marine gravel have been made over three tidal cycles. The turbulence in the bottom boundary layer was measured using two electromagnetic current meters, and the gravel transport was measured using a passive acoustic system which monitored the interparticle collision noise of locally mobile material. Visual estimates of bedload were also obtained with an underwater TV camera. The acoustic technique, unlike a conventional bedload sampler, has allowed estimates of transport to be obtained with a temporal resolution comparable with the turbulence data collected. This has enabled a detailed comparison to be made between the turbulent flow and the sediment response to the instantaneous flow conditions. The results of the study show that of the turbulent bursting events which contribute towards the Reynolds stress, only the sweeps and outward interactions play a significant role in the transport of coarse sedimentary material. The measurements show that it is the instantaneous increases in the horizontal turbulent velocity fluctuations that generate excess shear stresses which drive the transport process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1989.tb00820.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    REPLY (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 38 (1991), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1991.tb01866.x
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  • 3
    Electronic Resource
    Electronic Resource
    Comparisons between acoustic measurements and predictions of the bedload transport of marine gravels (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 36 (1989), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Continuous, detailed records of marine gravel transport have been obtained acoustically and compared with bedload transport rates (qb) predicted by five bedload transport equations using measurements of the near-bed turbulent current flow. When mean flow data are used in these equations, total qb estimates are similar to those measured. However, when instantaneous flow data are used, total qb is over-estimated by approximately one order-of-magnitude. Based on the acoustic measurements, an empirical equation has been obtained that gives accurate estimates of total qb over a tidal cycle and simulates well the intermittent characteristics of marine bedload transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1989.tb01534.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of turbulence in the benthic boundary layer over a gravel bed (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 36 (1989), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: It is now generally recognized that the mathematical description of sediment dynamics will be improved through an understanding of geophysical turbulence. In this study, therefore, the turbulence characteristics of the benthic boundary layer over coarse sediments are examined as a step towards the realization of such a description.Examination of the turbulence has been conducted using spectral, correlation, quadrant and statistical analyses, and a number of features have been identified. Mean eddy length scales obtained using spectral and autocorrelation techniques were found to be similar. The interpretation of the duration and interval between the intermittent ‘bursting’ events, scaled using outer flow variables, was found to be dependent upon the sampling interval. Autocorrelation analysis revealed a high correlation between bedload transport and the instantaneous horizontal flow component rather than instantaneous kinematic stress. From the standpoint of developing prognostic transport models based on physically realistic benthic flow processes, it is considered that turbulence measurements will lead to such formulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1989.tb01533.x
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  • 5
    Electronic Resource
    Electronic Resource
    Attribution of observed surface humidity changes to human influence (2007)
    [s.l.] : Nature Publishing Group
    Nature 449 (2007), S. 710-712 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Water vapour is the most important contributor to the natural greenhouse effect, and the amount of water vapour in the atmosphere is expected to increase under conditions of greenhouse-gas-induced warming, leading to a significant feedback on anthropogenic climate change. Theoretical and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature06207
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  • 6
    Electronic Resource
    Electronic Resource
    Atmospheric science Tropospheric temperature series from satellites (2004)
    [s.l.] : Nature Publishing Group
    Nature 432 (2004), S. 0 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Arising from: Q. Fu et al. Nature 429, 55–58 (2004); see also communication from Gillett et al.; Fu et al. replyThere has been considerable debate about changes in the temperature of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03208
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  • 7
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    Mauritius Royal Alfred Observatory parallel temperature measurements 1884-1903 (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: A suite of parallel meteorological measurements were undertaken over the extended period 1884-1903 at the Royal Alfred Observatory in Mauritius. The data were observed in: a well-ventilated room, by means of a Thermograph in a dedicated building, in a Stevenson Screen and by a Hygrometer in a different Stevenson Screen both in an enclosure, and for a short period two additional Stevenson Screens. Data were recorded in a series of annual reports from the observatory - two forms of which were produced each year. However, only a subset of these reports have been found. Data have been transcribed as monthly summaries of maximum, minimum, average (of certain hours) and mean (of max/min). The latter have been computed from max and min where not directly reported. All values are in the originally reported Fahrenheit values. Data were transcribed for a masters thesis by Samuel Awe and supplemented by subsequent transcriptions by Peter Thorne.
    Keywords: DATE/TIME; HYGRO; Hygrometer; Large Stevenson; Mauritius; Monitoring station; MONS; parallel measurements; RAO_Mauritius; Room; Royal Alfred Observatory, Mauritius; Stevenson; Stevenson at 6ft; Surface Temperature; Temperature, air, daily maximum; Temperature, air, daily minimum; Temperature, air, monthly mean; Thermograph
    Type: Dataset
    Format: text/tab-separated-values, 3000 data points
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  • 8
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    Estimates of land surface air temperature changes homogenised using sparse input 20th Century reanalysis product 20CRv3 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: The data consist of 4 frozen gridded estimates as described in Gillespie et al, 2022. The data are presented as 5 degree resolution global fields over 1850-2014. Station data arising from the International Surface Temperature Initiative (ISTI) global databank of monthly holdings have been homogenised using 20CRv3 to identify breakpoints. Four distinct approaches to adjustment have been undertaken resulting in 4 separate estimates of the resulting series. The gridding is a simple gridbox average of any observations available within each 5 degree gridbox. Data is available for those global land areas for which underlying station data are available in teh ISTI holdings.
    Keywords: Binary Object; Binary Object (File Size); File content; GlobCover; Surface Temperature
    Type: Dataset
    Format: text/tab-separated-values, 8 data points
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  • 9
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    Mauritius Royal Alfred Observatory parallel temperature measurements 1884-1903, original file in °Fahrenheit (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: A suite of parallel meteorological measurements were undertaken over the extended period 1884-1903 at the Royal Alfred Observatory in Mauritius. The data were observed in: a well-ventilated room, by means of a Thermograph in a dedicated building, in a Stevenson Screen and by a Hygrometer in a different Stevenson Screen both in an enclosure, and for a short period two additional Stevenson Screens. Data were recorded in a series of annual reports from the observatory - two forms of which were produced each year. However, only a subset of these reports have been found. Data have been transcribed as monthly summaries of maximum, minimum, average (of certain hours) and mean (of max/min). The latter have been computed from max and min where not directly reported. All values are in the originally reported Fahrenheit values. Data were transcribed for a masters thesis by Samuel Awe and supplemented by subsequent transcriptions by Peter Thorne.
    Keywords: Mauritius; Monitoring station; MONS; parallel measurements; RAO_Mauritius; Royal Alfred Observatory, Mauritius; Surface Temperature
    Type: Dataset
    Format: text/plain, 21.4 kBytes
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  • 10
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    Concentrations of individual polychlorinated biphenyl congeners in soils from East Chicago, Indiana, USA in 2017/2018 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: Individual polychlorinated biphenyls (PCBs) in surficial urban soil from East Chicago, Indiana, USA, were measured and reported here from thirty-three sites. Gas chromatography (GC) in tandem with Mass Spectrometry GC-MS/MS (Agilent 7000) in multiple reaction monitoring (MRM) mode was used to quantify all 209 congeners in 171 individual or coeluting congener peaks. The GC was equipped with a Supelco SBP-Octyl capillary column (30 m × 0.25 mm ID, 0.25 mm film thicknesses) with helium as carrier gas.
    Keywords: Date/time end; Date/time start; Distance; EastChicago_EC-1; EastChicago_EC-10; EastChicago_EC-11; EastChicago_EC-12; EastChicago_EC-13; EastChicago_EC-14; EastChicago_EC-15; EastChicago_EC-16; EastChicago_EC-17; EastChicago_EC-18; EastChicago_EC-19; EastChicago_EC-2; EastChicago_EC-20; EastChicago_EC-21; EastChicago_EC-22; EastChicago_EC-23; EastChicago_EC-24; EastChicago_EC-25; EastChicago_EC-26; EastChicago_EC-27; EastChicago_EC-28; EastChicago_EC-29; EastChicago_EC-3; EastChicago_EC-30; EastChicago_EC-31; EastChicago_EC-32; EastChicago_EC-33; EastChicago_EC-4; EastChicago_EC-5; EastChicago_EC-6; EastChicago_EC-7; EastChicago_EC-8; EastChicago_EC-9; East Chicago, Indiana, USA; Event label; Hand trowel; LATITUDE; LONGITUDE; Method comment; PCB congeners; Polychlorinated biphenyl, per soil dry mass; Sample code/label; Soil; tandem mass spectrometry (GC-MS/MS) in multiple reaction monitoring mode (MRM); TOC; TROW
    Type: Dataset
    Format: text/tab-separated-values, 5808 data points
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