Are mesoscale perturbation experiments in polar waters prone to physical artefacts? Evidence from algal aggregation modelling studies

Details Are mesoscale perturbation experiments in polar waters prone to physical artefacts? Evidence from algal aggregation modelling studies Are mesoscale perturbation experiments in polar waters prone to physical artefacts? Evidence from algal aggregation modelling studies

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k..36b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 11, pp. 36-1, CiteID 1541, DOI 10.1029/2001GL014210

Mathematics

Logic

5

Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Oceanography: Biological And Chemical: Plankton, Oceanography: Biological And Chemical: Modeling

Scientific paper

The longevity (>50d) of the phytoplankton bloom following mesoscale iron-enrichment of Southern Ocean waters (SOIREE) exceeded that for naturally occurring polar blooms (15-20d). During SOIREE, SF6-labelled waters increased 20-fold, and the greatest algal loss term was lateral advection. To test whether such advective losses could delay the onset of mass sedimentation, an algal aggregation model was employed. It successfully simulated temporal trends in mass sedimentation during the tropical IronEx II bloom, yet suggested no such event during SOIREE. However, when an iron-enrichment of 100 km length-scale (i.e. tenfold greater than for SOIREE) was mimicked, a marked increase in algal aggregate size occurred after 15d, indicative of increased export. Thus, careful interpretation of experimental results-especially for the fate of algal carbon-is essential, particularly for polar studies where the ratio of net algal growth to advective losses is low, if they are to be extrapolated to open-ocean waters.

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