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Average seasonal changes in chlorophyll a in Icelandic waters

Gudmundsson, K. and Heath, M.R. and Clarke, E.D. and , Marine Laboratory, Aberdeen, Scotland (Funder) and , Marine Research Institute, Reykjavik, Iceland (Funder) (2009) Average seasonal changes in chlorophyll a in Icelandic waters. ICES Journal of Marine Science, 66 (10). pp. 2133-2140. ISSN 1054-3139

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    Abstract

    The standard algorithms used to derive sea surface chlorophyll a concentration from remotely sensed ocean colour data are based almost entirely on the measurements of surface water samples collected in open sea (case 1) waters which cover ~60% of the worlds oceans, where strong correlations between reflectance and chlorophyll concentration have been found. However, satellite chlorophyll data for waters outside the defined case 1 areas, but derived using standard calibrations, are frequently used without reference to local in situ measurements and despite well-known factors likely to lead to inaccuracy. In Icelandic waters, multiannual averages of 8-d composites of SeaWiFS chlorophyll concentration accounted for just 20% of the variance in a multiannual dataset of in situ chlorophyll a measurements. Nevertheless, applying penalized regression spline methodology to model the spatial and temporal patterns of in situ measurements, using satellite chlorophyll as one of the predictor variables, improved the correlation considerably. Day number, representing seasonal variation, accounted for substantial deviation between SeaWiFS and in situ estimates of surface chlorophyll. The final model, using bottom depth and bearing to the sampling location as well as the two variables mentioned above, explained 49% of the variance in the fitting dataset.

    Item type: Article
    ID code: 18622
    Keywords: chlorophyll a, modelling, north atlantic, remote sensing, seasonal, subarctic, mathematics, marine science, Mathematics, Ecology, Ecology, Evolution, Behavior and Systematics, Oceanography, Aquatic Science
    Subjects: Science > Mathematics
    Department: Faculty of Science > Mathematics and Statistics
    Related URLs:
      Depositing user: Mrs Ann Lynch
      Date Deposited: 12 Apr 2010 12:17
      Last modified: 05 Sep 2014 13:47
      URI: http://strathprints.strath.ac.uk/id/eprint/18622

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