Vol. 8, No. 2, 114-139, 2009
Time-series analysis of remotely-sensed SeaWiFS chlorophyll in river-influenced coastal regions|
James G. Acker, Erin McMahon, Suhung Shen, Thomas Hearty and Nancy Casey
The availability of a nearly-continuous
record of remotely-sensed chlorophyll a data (chl a)
from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS)
mission, now longer than ten years, enables examination of time-series trends
for multiple global locations. Innovative data analysis technology available on
the World Wide Web facilitates such analyses. In coastal regions influenced by
river outflows, chl a is not always indicative of actual trends in phytoplankton
chlorophyll due to the interference of coloured dissolved organic matter and
suspended sediments; significant chl a time-series trends for coastal regions
influenced by river outflows may nonetheless be indicative of important
alterations of the hydrologic and coastal environment. Chl a time-series analysis of nine marine
regions influenced by river outflows demonstrates the simplicity and usefulness
of this technique. The analyses indicate that coastal time-series are
significantly influenced by unusual flood events. Major river systems in
regions with relatively low human impact did not exhibit significant trends.
Most river systems with demonstrated human impact exhibited significant
negative trends, with the noteworthy exception of the Pearl River in China,
which has a positive trend.
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Submitted: 4 Feb 2009
Revised: 20 Oct 2009
Accepted: 21 Oct 2009
Published: 11 Nov 2009
Responsible editor: Rainer Reuter
Acker J G, E McMahon, S Shen, T Hearty & N Casey, 2009.
Time-series analysis of remotely-sensed SeaWiFS chlorophyll in river-influenced coastal regions.
EARSeL eProceedings, 8(2): 114-139