In situ settling speeds of marine snow aggregates below the mixed layer: Black Sea and Gulf of Mexico
In situ settling speeds of marine snow aggregates below the mixed layer: Black Sea and Gulf of Mexico
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DOI：
10.1016/s0967-0637(96)00104-5
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发表时间：
1997-03-01
影响因子：
2.4
通讯作者：
Asper, VL
中科院分区：
文献类型：
--
作者：
Diercks, AR;Asper, VL
在黑海中部和墨西哥湾北部，用海洋集料沉降收集器和观测塔(吉祥物)测定了海洋积雪集合体的现场沉降速度。黑海的数据显示，海洋雪团聚体(直径0.5-5.5毫米，日沉降速度1.3-280米)的大小和沉降速度分布很广，所有大小等级的平均沉降速度为11.7米/日。然而，这些沉降速度可能受到了在吉祥物丙烯酸室一侧的水中加入盐(高于背景海水0.9%)和福尔马林的影响。来自墨西哥湾的数据在大小和速度方面范围较小(直径0.5-3.5毫米，每天10-89米)。所有粒级的平均沉降速度(33.8米/天)大约是在黑海测得的集料的三倍。斯托克斯定律预测，沉降速度由聚集体的密度和体积共同决定。对于这两个研究地点，没有发现沉降速度与聚集体的当量球径(ESD)有统计学上的相关性。因此，得出的结论是，密度的变化控制着在这两个研究区域测量的集料沉降速度。(C)1997年爱思唯尔科学有限公司。
In situ settling speeds of marine snow aggregates were determined with the Marine Aggregate Settling Collector and Observation Tower (MASCOT) in the central Black Sea and in the northern Gulf of Mexico. The Black Sea data showed a wide distribution in size and settling speeds of marine snow aggregates (0.5-5.5 mm diameter and 1.3-280 m/d) with an average settling speed of 11.7 m/d over all size classes. However, these settling speeds might have been influenced by the addition of salt (0.9% above the background seawater) plus formalin to the water in one side of the acrylic chamber of the MASCOT. Data from the Gulf of Mexico had a smaller range in terms of size and speed (0.5-3.5 mm diameter and 10-89 m/d). The average settling speed over all size classes was approximately three times higher (33.8 m/d) than for aggregates measured in the Black Sea. Stokes' Law predicts that settling speeds are determined by both density and volume of an aggregate. For both study sites no statistically significant correlation of settling speed with the equivalent spherical diameter (ESD) of the aggregates was found. It was therefore concluded that variations in density controlled the aggregate settling speeds measured in these two study areas. (C) 1997 Elsevier Science Ltd.