Iron links river runoff and shelf width to phytoplankton biomass along the U.S. West Coast

Details Iron links river runoff and shelf width to phytoplankton biomass along the U.S. West Coast Iron links river runoff and shelf width to phytoplankton biomass along the U.S. West Coast

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3404607c&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 4, CiteID L04607

Mathematics

Logic

13

Hydrology: Streamflow, Oceanography: General: Coastal Processes, Oceanography: Biological And Chemical: Phytoplankton, Oceanography: Biological And Chemical: Trace Elements (0489)

Scientific paper

A poleward increase in phytoplankton biomass along the West Coast of North America has been attributed to increasing river runoff towards the north. We combine streamflow and shelf width data with satellite-derived estimates of phytoplankton biomass to quantify the relationship between these variables. We find that a combination of winter streamflow and shelf width can account for over 80% of the spatial variance in summer chlorophyll within 50 km of the coast. At a given location, interannual variability in streamflow is not associated with interannual variability in chlorophyll. We attribute these relationships to the role of rivers as suppliers of the micronutrient iron, and the role of the shelf as a `capacitor' for riverine iron, charging during the high-flow winter season and discharging during the upwelling season. Data from the Oregon shelf confirm that, during winter, a significant fraction of riverine iron escapes the estuary and reaches the coastal ocean.

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