Transformations of biogenic particulates from the pelagic to the deep ocean realm

被引:83
作者
Boyd, PW
Sherry, ND
Berges, JA
Bishop, JKB
Calvert, SE
Charette, MA
Giovannoni, SJ
Goldblatt, R
Harrison, PJ
Moran, SB
Roy, S
Soon, M
Strom, S
机构
[1] Univ British Columbia, Sch Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
[2] Queens Univ Belfast, Sch Biol & Biochem, Belfast BT9 7BL, Antrim, North Ireland
[3] Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC, Canada
[4] Univ Rhode Isl, Grad Sch Oceanog, Narragansett, RI 02882 USA
[5] Oregon State Univ, Dept Microbiol, Corvallis, OR 97331 USA
[6] Inst Natl Rech Sci Oceanol, Rimouski, PQ G5L 3A1, Canada
[7] Western Washington Univ, Bellingham, WA 98225 USA
[8] DFO, Inst Ocean Sci, Sidney, BC V8L 4B2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/S0967-0645(99)00083-1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
This overview compares and contrasts trends in the magnitude of the downward Particulate Organic Carbon (POC) flux with observations on the vertical profiles of biogeochemical parameters in the NE subarctic Pacific. Samples were collected at Ocean Station Papa (OSP, 50 degrees N, 145 degrees W), between 18-22 May 1996, on pelagic stocks/rate processes, biogenic particle fluxes (drifting sediment traps, 100-1000 m), and vertical profiles of biogeochemical parameters from MULVFS (Multiple Unit Large Volume Filtration System) pumps (0-1000 m). Evidence from thorium disequilibria, along with observations on the relative partitioning of particles between the 1-53 mu m and > 53 mu m classes in the 50 m mixed layer, indicate that there was little particle aggregation within the mixed layer, in contrast to the 50-100 m depth stratum where particle aggregation predominated. Vertical profiles of thorium/uranium also provided evidence of particle decomposition occuring at depths ca. 150 m; heterotrophic bacteria and mesozooplankton were likely responsible for most of this POC utilisation. A water column carbon balance indicated that the POC lost from sinking particles was the predominant source of carbon for bacteria, but was insufficient to meet their demands over the upper 1000 m. While, the vertical gradients of most parameters were greatest just below the mixed layer, there was evidence of sub-surface increases in microbial viability/growth rates at depths of 200-600 m. The C:N ratios of particles intercepted by free-drifting and deep-moored traps increased only slightly with depth, suggesting rapid sedimentation even though this region is dominated by small cells/grazers, and the upper water column is characterised by long particle residence times (> 15 d), a fast turnover of POC (2 d) and a low but constant downward POC flux. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2761 / 2792
页数:32
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