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Lomas, M. W., Bermuda Institute of Ocean Sciences, St George's, Bermuda, Michael.Lomas@bios.edu
Church, M. J., University of Hawaii at Manoa, Honolulu, USA, mjchurch@hawaii.edu


Much of our understanding of temporal variability associated with ocean biogeochemistry derives from sustained, systematic, shipboard time-series observations. Two of these time-series, the Bermuda Atlantic Time-series Study (BATS) and the Hawai’i Ocean Time-series (HOT), have made measurements in the subtropical North Atlantic and North Pacific, respectively, for two decades. Interestingly, both time-series have similar daily rates of euphotic zone integrated primary production and have observed a similar ~50% increase in these rates during their lifetimes. In both cases, increased primary production is driven in large part by increases in phytoplankton standing stock (derived from chlorophyll) despite large differences in other important ecosystem variables such as nutrients. For example, dissolved inorganic nitrogen and phosphorus inventories at HOT are nearly an order of magnitude greater than at BATS, yet particulate nitrogen and phosphorus inventories are the same. Phytoplankton communities also exhibit different trends with eukaryotes becoming an increasingly larger fraction of the autotrophic biomass at HOT, while at BATS the opposite is happening and carbon export fluxes at the base of the euphotic zone are increasing. These two systems seem to be ideal case studies due to data density as well as more complete datasets of ecosystem parameters, to understand how such drastically different systems can propagate nearly identical trends in carbon fixation.

Session #:S02
Date: 02-18-2011
Time: 09:30

Presentation is given by student: No