IMPACTS OF EL NINO ON EXPORT PRODUCTION IN THE CALIFORNIA CURRENT ECOSYSTEM (E)
The onset of the warm phase of the El Nino-Southern Oscillation (ENSO) has been linked to dramatic shifts in plankton community structure and declines in primary productivity in coastal upwelling biomes in the Americas; however, the impact of these food web alterations on the efficiency of the biological pump has not been elucidated. We will compare data from the 2016 CCE LTER El Nino Rapid Response cruise (Apr 2016) to data from 5 ENSO neutral/cold phase cruises in order to investigate potential changes in export efficiency (measured with sediment traps and 234Th) driven by the unique physical forcings and community shifts in the California Current during an El Nino period. Emphasis is placed on a comparison to previous spring cruises (May 2006, Apr 2007, Apr 2009) during El Nino neutral years and to a cruise during the 2014 Pacific “warm blob” feature that had similar surface temperatures to El Nino but distinctly different physical forcing. Numerous ancillary ecosystem and physical datasets taken during the California Current Ecosystem LTER Process Cruises will allow assessment of the principle drivers for export and their consistency with non-El Nino conditions. Preliminary results show high C and pigment flux in a spatially-restricted high chlorophyll band near the coast and substantially lower export flux from the warm, low chlorophyll waters that dominated the region during the 2015-16 El Nino.
Kelly, T. B., Florida State University, USA, firstname.lastname@example.org
Stukel, M. R., Florida State University, USA, email@example.com
Time: 15:30 - 16:30
Location: Poster/Exhibit Hall
Presentation is given by student: Yes