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  • Articles  (2)
  • Articles: DFG German National Licenses  (2)
  • Benthic video  (1)
  • photochemical balance  (1)
  • 2015-2019
  • 1995-1999  (2)
  • 1975-1979
  • 1920-1924
  • 1999  (2)
Collection
  • Articles  (2)
Source
  • Articles: DFG German National Licenses  (2)
Keywords
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  • 2015-2019
  • 1995-1999  (2)
  • 1975-1979
  • 1920-1924
Year
  • 1999  (2)
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Validity and reproducibility of benthic cover estimates made during broadscale surveys of coral reefs by manta tow (1999)
    Springer
    Coral reefs 18 (1999), S. 353-356 
    Details
    ISSN: 1432-0975
    Keywords: Key words Coral Reef ; Manta tow ; Survey ; Benthic video ; Observer ; Comparisons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract  There is limited information on the validity and reproducibility of estimates of benthic cover from manta tow surveys. To address this, benthic cover estimates from the same reef area were compared (i) among observers and (ii) with an independent assessment using under-water video. Benthic cover was classified into 11 categories. There was generally unbiased agreement within one cover category, both among observers (89%) and for comparisons between manta tow and video (86%). While estimates of dead coral cover were reproducible, they were not valid because the concordance between observer estimates and video estimates was not greater than would be expected by chance. Manta tow estimates of the cover of sand and rubble were biased in that they consistently overestimated sand and rubble cover in comparison with estimates from video. The results indicate that manta towing is generally effective for the broadscale estimation of live coral cover, providing observers receive adequate training.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003380050212
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Interpretation of Mid-Stratospheric Arctic Ozone Measurements Using a Photochemical Box-Model (1999)
    Springer
    Journal of atmospheric chemistry 34 (1999), S. 281-290 
    Details
    ISSN: 1573-0662
    Keywords: ozone ; photochemical balance ; catalytic ozone destruction ; oxygene photolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract In this study measurements of mid-stratospheric Arctic ozone are compared with model simulations. The measurements obtained at Spitsbergen (79°N, 12°E) by ground based millimeter-wave radiometry exhibit large day to day variabilities as well as periods with low ozone. To interpret these measurements, calculations were made using the new photochemical box-trajectory model BRAPHO, with air parcel trajectories calculated from analyzed wind fields. Using a relatively simple approach, the model reproduces the observed ozone variability well, including inter-annual variations. The explanation for the observed ozone behavior is that at these altitudes ozone is determined by what we call ‘dynamically controlled photochemistry’. This means that the photochemical evolution of the ozone volume mixing ratio is mainly controlled by the atmospheric dynamics, in particular the solar zenith angle the air parcel has experienced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006198414518
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    Paper (German National Licenses)
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