Aquatic Sciences Meeting, Albuquerque 2001
| SS11 Warm Oligotrophic Waters (Environmental Connections) |
| Date: Monday, February 12, 2001, Time: 3:00:00 PM |
| Location: Aztec |
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| Sheridan, C, C, University of Hawaii, Honolulu, USA, sheridan@soest.hawaii.edu |
| Lee, C, , SUNY at Stony Brook, Stony Brook, USA, cindylee@notes.cc.sunysb.edu |
| Wakeham, S, G, Skidaway Institute of Oceanography, Savannah, USA, stuart@skio.peachnet.edu |
| Hedges, J, I, University of Washington, Seattle, USA, jihedges@ocean.washington.edu |
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| SUSPENDED PARTICLES IN THE EQUATORIAL PACIFIC OCEAN: ORGANIC CONCENTRATION, COMPOSITION, AND RELATION TO PARTICLE CYCLING IN SURFACE AND MIDWATERS |
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| Production and cycling of particulate organic material is examined through amino acid, pigment, and lipid analysis of suspended particles. Suspended particles were collected by in-situ filtration during the 1992 U.S. JGOFS program in the equatorial Pacific Ocean. Composition of surface water suspended particles is strongly associated with changes in diatom and prymnesiophyte abundance during El Niņo and normal upwelling conditions. Midwater (250-850m) suspended particles are significantly different in organic composition from suspended particles collected in surface waters. Changes in the composition of midwater suspended particles indicate that phytoplankton source material entering the midwater suspended particle pool is increasingly degraded and replaced with material derived
from zooplankton and microbes at depth. Principle components analysis of particulate organic composition further indicates that midwater suspended particles are more labile than sinking particles collected at comparable depths. Only at depths greater than 650m does the degradation state of suspended particulate material compare with that of sinking particles collected at 150m. Results of these organic analyses suggest that conceptual models of particle cycling must better incorporate dynamic interactions between sinking and suspended particle pools. |
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