| Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling | |
| Lafite, R; Shimwell, S; Grochowski, N; Dupont, JP; Nash, L; Salomon, JC; Cabioch, L; Collins, M; Gao, S | |
| 2000-11-01 | |
| 发表期刊 | OCEANOLOGICA ACTA
 |
| ISSN | 0399-1784 |
| 卷号 | 23期号:6页码:687-700 |
| 文章类型 | Article |
| 摘要 | Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to 74.5 mg L-1): resuspension processes, in response to semi-diurnal tidal cycles (with a period of around 12.4 h) and spring-neap cycles (with a period of 15 days) make significant contributions. Distinctive seasonal/annual concentration changes have also been observed. In the offshore waters, such variability is much less significant (0.9 to 6.0 mg L-1). In the summer the English Coastal Zone is associated with relatively high SPM concentrations: the Central Zone has a low and stable SPM concentration between these zones, there is a Transitional Zone, where there is a rapid response of SPM concentration to wind forcing. Finally, the French Coastal Zone is characterized by variable (sometimes high) SPM concentrations. Because of the zonation, SPM fluxes within the Dover Strait are controlled by different transport mechanisms. Within the Central Zone, the flux can be represented by the product of mean water discharges and SPM concentrations. However, within the coastal zones fluctuations in SPM concentrations on various time-scales must be considered. In order to calculate the maximum and minimum SPM fluxes, 10 cells were divided in the strait. A simple modelling calculation has been proposed for this complex area. The effect of spring-neap tidal cycles and seasonal changes can contribute significantly to the overall flux, which is of the order of 20 x 10(6) t.yr(-1) (through the Dover Strait, towards the North Sea). Such an estimate is higher than most obtained previously. (C) 2000 Ifremer/CNRS/IRD/Editions scientifiques et medicales Elsevier SAS.; Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to 74.5 mg L-1): resuspension processes, in response to semi-diurnal tidal cycles (with a period of around 12.4 h) and spring-neap cycles (with a period of 15 days) make significant contributions. Distinctive seasonal/annual concentration changes have also been observed. In the offshore waters, such variability is much less significant (0.9 to 6.0 mg L-1). In the summer the English Coastal Zone is associated with relatively high SPM concentrations: the Central Zone has a low and stable SPM concentration between these zones, there is a Transitional Zone, where there is a rapid response of SPM concentration to wind forcing. Finally, the French Coastal Zone is characterized by variable (sometimes high) SPM concentrations. Because of the zonation, SPM fluxes within the Dover Strait are controlled by different transport mechanisms. Within the Central Zone, the flux can be represented by the product of mean water discharges and SPM concentrations. However, within the coastal zones fluctuations in SPM concentrations on various time-scales must be considered. In order to calculate the maximum and minimum SPM fluxes, 10 cells were divided in the strait. A simple modelling calculation has been proposed for this complex area. The effect of spring-neap tidal cycles and seasonal changes can contribute significantly to the overall flux, which is of the order of 20 x 10(6) t.yr(-1) (through the Dover Strait, towards the North Sea). Such an estimate is higher than most obtained previously. (C) 2000 Ifremer/CNRS/IRD/Editions scientifiques et medicales Elsevier SAS. |
| 关键词 | Suspended Particulate Matter Flux Transport Mechanisms Straits English Channel |
| 学科领域 | Oceanography |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000165991400003 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/3832 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Univ Rouen, UPRESA 6143, Lab Morphodynam Continentale & Cotiere, F-76821 Mt St Aignan, France 2.Univ Southampton, Dept Oceanog, Southampton SO14 3ZH, Hants, England 3.CNRS, Grp Rech Manche, F-75700 Paris, France 4.IFREMER, Ctr Brest, F-29280 Plouzane, France 5.Biol Stn, F-29687 Roscoff, France 6.Acad Sinica, Inst Oceanol, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lafite, R,Shimwell, S,Grochowski, N,et al. Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling[J]. OCEANOLOGICA ACTA,2000,23(6):687-700. |
| APA | Lafite, R.,Shimwell, S.,Grochowski, N.,Dupont, JP.,Nash, L.,...&Gao, S.(2000).Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling.OCEANOLOGICA ACTA,23(6),687-700. |
| MLA | Lafite, R,et al."Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling".OCEANOLOGICA ACTA 23.6(2000):687-700. |
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