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U.S. Cruise Report for BIE II April 10 - May 29, 1992 R/V YUZHMORGEOLOGIYA
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1992
[PDF-3.19 MB]
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Description:The main goal of the 1992 BIE cruise was to create a sediment redeposition impact on the benthic community at the BIE study site located in the Pacific Ocean at 13° 00' N and 128° 22' w. Immediately following sediment redeposition an effort was made to map the extent of the sediment redeposition in the study site. Additionally, samples were taken to assess the short term effects of sediment redeposition on the bacteria and meiofaunal communities. Russian scientists also processed core samples to assess the effects of sediment redeposition on sediment pore water chemistry. Our primary objectives on the 1992 BIE cruise were as follows: A) Test the Deep Sea Sediment Resuspension System and newly purchased multicorer at the Patton Escarpment test site off Long Beach, California; B) Collect four baseline box core samples to fill in gaps in our pre-impact sample coverage; C) Recover and redeploy two Aanderaa current meters and deploy a sediment-trap array within the study area; D) Create a large-scale redeposition event by towing the Deep Sea Sediment Resuspension System (DSSRS) through a 400- m-x-2200-m polygon; E) Map the resedimentation plume using CTD casts, sediment-traps and multicore samples; F) Collect short-term post-disturbance samples to assess microbiological and meiofaunal impacts using a multicorer; G) Deploy 8 current meter moorings to obtain more detailed information about the deep ocean currents in the BIE study area. The remainder of this report details the results of each of these six objectives.
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