Site: California Current Ecosystem LTER

Sampling with a Trace Metal-clean rosette.
Credit: K. Barbeau lab

Iron supply in the CCE LTER region not only impacts carbon production and export associated with mesoscale circulation features. It also influences phytoplankton growth and species composition at the subsurface chlorophyll maximum layer (SCML), which is a widespread feature during spring and summer. Consistent with regional climate indices, biogeochemical proxies for iron limitation revealed increasing frequency of iron limitation at SCMLs in the California Current system. These results are relevant to upwelling systems worldwide.