The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom

Details The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom The impact of advective transport by the South Indian Ocean Countercurrent on the Madagascar plankton bloom

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3906602h&link_type=abstract

Geophysical Research Letters, Volume 39, Issue 6, CiteID L06602

Mathematics

Logic

Oceanography: Physical: Currents, Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Physical: Fronts And Jets, Oceanography: Biological And Chemical: Phytoplankton

Scientific paper

Based on ten years (1998–2007) of satellite ocean color data we analyze the spatiotemporal patterns in the seasonal Madagascar plankton bloom with respect to the advection of the recently discovered Southern Indian Ocean Countercurrent (SICC). In maps of Finite-time Lyapunov Exponents (FTLE) and Finite-Time Zonal Drift (FTZD) computed from altimetry derived velocities we observe a narrow zonal jet that starts at ∼25°S at the southern tip of Madagascar, an important upwelling region, and extends to the east further than the largest plankton blooms (∼2500 km). In bloom years, the jet coincides with large parts of the northern boundary of the plankton bloom, acting as a barrier to meridional transport. Our findings suggest that advection is an important and so far underestimated mechanism for the eastward propagation and the extent of the plankton bloom. This supports the hypothesis of a single nutrient source south of Madagascar.

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