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| DOI | 10.1029/2023JC020441 |
| Temporal Pattern and Profile of a Coastal-Deep Sea Conveyor at a Marginal Deep Oligotrophic Sea | |
| 发表日期 | 2024 |
| ISSN | 2169-9275 |
| EISSN | 2169-9291 |
| 起始页码 | 129 |
| 结束页码 | 6 |
| 卷号 | 129期号:6 |
| 英文摘要 | Sediment trap data set and 234Th profiles (deep water excesses and deficits) reveal that particulate organic carbon (POC) export at the highly oligotrophic Levantine Sea is dominated by lateral transport from the nearby margin. These intermediate nepheloid layers (INL) operate at multi-depth, with the silt-to-clay size particulate matter (PM) fraction transported at water depths of about 100-500 m, while finer fraction arrives also at deeper depths. The shallow NIL is triggered by winter storms, manipulated by coastal flash floods and shelf resuspension and assisted by cross-shore currents, which allow the arrival of PM at a distance of 50 km within about 10 days. The deeper INL could be related to sediments initially driven to depth by density currents. Our data show that inter-annual differences in sediment trap fluxes were related to changes in both the intensity of coastal floods and current velocity. The frequent observation of deep-water 234Th excesses during a (relatively) low export winter (2018) is related to lessened cleansing of the water column, that is, reduced removal of fine-grained PM by sinking coarser-grained material. These observations highlight the importance of winter storm intensity in the POC budget of marginal seas like the Levantine Basin (LB) even in areas with limited river discharge. This further suggests that the anticipated increase in extreme weather events due to the on-going climate change should have an impact on this coastal-deep sea conveyor and on POC export in the LB. We present sediment traps and radioisotope results from the DeepLev marine station, the first deep water mooring to be deployed in the highly fragile ecosystem of the Levantine Basin (eastern Mediterranean Sea). Unlike the open ocean, particulate organic carbon export from surface to deep water is controlled by the transport of particulate matter from the nearby coast/continental shelf. We show that this land-sea conveyor is nurtured by flash floods and shelf sediment resuspension, and is further manipulated by cross-shore currents. The conveyor operates at multiple depths, with silt and clay transported sub-horizontally from the shelf, arriving at DeepLev within ca. 10 days at 100-500 m depth (shallow intermediate nepheloid layer, INL), while colloids being carried through the whole water column (deep INL). The latter is probably related to particle-laden density currents, which flow down submarine canyons, cutting into the nearby continental slope. Inter-annual changes in winter events and cross-shore current velocity result in significant changes of POC export intensity. This further implies that the predicted increase in the occurrence of extreme meteorological events could result in an enhanced transport of particular carbon, with important implications to the POC export in this and other marginal basins. POC export in the Levantine Basin is controlled by lateral transport of multi-depths intermediate nepheloid layers (INL) The shallow INL carries silt and clay from the coast and shelf, while the deep INL hauls colloids related to transport through submarine canyons Inter-annual variability in winter event intensity results in lateral transport and vertical export variability |
| 英文关键词 | sediment traps; POC; nepheloid layer; Levantine Basin; climate change |
| 语种 | 英语 |
| WOS研究方向 | Oceanography |
| WOS类目 | Oceanography |
| WOS记录号 | WOS:001235787900001 |
| 来源期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/296349 |
| 作者单位 | Bar Ilan University; Israel Oceanographic & Limnological Research Institute; University of Haifa |
| 推荐引用方式 GB/T 7714 | . Temporal Pattern and Profile of a Coastal-Deep Sea Conveyor at a Marginal Deep Oligotrophic Sea[J],2024,129(6). |
| APA | (2024).Temporal Pattern and Profile of a Coastal-Deep Sea Conveyor at a Marginal Deep Oligotrophic Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(6). |
| MLA | "Temporal Pattern and Profile of a Coastal-Deep Sea Conveyor at a Marginal Deep Oligotrophic Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.6(2024). |
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