文章基本信息

标题：Scales of seafloor sediment resuspension in the northern Gulf of Mexico
本地全文：下载
作者：Arne-R. Diercks ; Clayton Dike ; Vernon L. Asper 等
期刊名称：Elementa: Science of the Anthropocene
电子版ISSN：2325-1026
出版年度：2018
卷号：6
期号：1
页码：32-59
DOI：10.1525/elementa.285
出版社：BioOne
摘要：10 cm s–1) and trap data.Low POC content combined with high lithogenic silica flux at 30 m above bottom (mab) compared to the flux at 120 mab, suggested local resuspension reaching 30 mab, but not 120 mab.Another similar event was detected by the changes in particle size distribution and settling speeds of particles in the benthic nepheloid layer.Flux data indicated two other small-scale events, which occurred at some distance, rather than locally.Inertia-driven resuspension of material in shallower areas surrounding the traps presumably transported this material downslope leaving a resuspension signal at 120 mab, but not at 30 mab.The passage of hurricane Isaac left a larger scale resuspension event that lasted a few days and was recorded in both traps.Although hurricanes cause large-scale events readily observable in sediment trap samples, resuspension events small in temporal and spatial scale are not easily recognizable in trapped material as they tend to provide less material and become part of the background signal in the long-term averaged trap samples.We suggest that these small-scale resuspension events, mostly unnoticed in conventional time-series sampling, play an important role in the redistribution and ultimate fate of sediment distribution on the seafloor.
关键词：BNL;Resuspension;marine snow;Deepwater Horizon;sediment traps;settling speed;