Diel variation in the vertical distribution of particulate matter (>0.15 mm) in the NW Mediterranean Sea investigated with the Underwater Video Profiler
Diel variation in the vertical distribution of particulate matter (>0.15 mm) in the NW Mediterranean Sea investigated with the Underwater Video Profiler
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DOI：
10.1016/s0967-0637(99)00100-4
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发表时间：
2000-03-01
影响因子：
2.4
通讯作者：
Gorsky, G
中科院分区：
文献类型：
--
作者：
Stemmann, L;Picheral, M;Gorsky, G
1995年5月，在地中海西北部的DYNAPROC时间序列巡航期间，研究了> 0.15 mm（PM）颗粒物粒度分布的日/夜变化。利用水下视频剖面仪（UVP）采集了PM（>0.15 mm）和浮游动物的垂直分布数据。UVP数据与浮游生物网数据和来自水瓶的POC数据的比较表明，由UVP检测到的颗粒物中超过97%是非生命颗粒物（0.15 mm），PM占GF/F过滤器测量的总干重的4-34%。对航行期间进行的七对昼夜垂直剖面图的比较表明，在800米以上，颗粒物的平均大小和体积在夜间高于白天。在夜间，Ph I的积分体积平均增加了32 +/-20%。这种增加对应于较小尺寸类别（< 0.5 mm）向较大尺寸类别（> 0.5 mm）的转移。在白天，这种模式相反，> 0.5 mm的PM数量减少。在研究期间，PM（60-800米）的现存量从7.5降至小于2gm（-2），但昼夜变化持续存在，除了在风事件后的两个短时间内在表层。浮游动物昼夜垂直迁移引起的周期性摄食活动可能是解释所观察到的水体中PM大小级别昼夜波动的最佳候选人。然而，我们的研究结果还表明，在上层额外的驱动力，如增加的湍流水平后，风事件或修改的动物园和浮游植物群落可以影响PM的时间演变。(C)2000爱思唯尔科技有限公司版权所有。
Day/night variations in the size distribution of the particulate matter > 0.15 mm (PM) were studied in May 1995 during the DYNAPROC time-series cruise in the northwestern Mediterranean Sea. Data on vertical distributions of PM (>0.15 mm) and zooplankton were collected with the Underwater Video Profiler (UVP). The comparisons of the UVP data with plankton net data and POC data from water bottles indicated that more than 97% of the particles detected by the UVP were non-living particles (0.15 mm) and that the PM contributed 4-34% of the total dry weight measured on GF/F filters. Comparison of seven pairs of day and night vertical profiles performed during the cruise showed that in the upper 800 m, the mean size and the volume of particles was higher at night than during the day. During the night, the integrated volume of the Ph I increased on average by 32 +/- 20%. This increase corresponded to a shift of smaller size classes ( < 0.5 mm) towards the larger ones (> 0.5 mm). During the day, the pattern was reversed, and the quantity of PM > 0.5 mm decreased. During the study period, the standing stock of PM (60-800 m) decreased from 7.5 to less than 2gm(-2) but the diel variations persisted, except for two short periods in the superficial layer following a wind event. The cyclic feeding activity induced by the diel vertical migration of zooplankton could be the best candidate to explain the observed diel fluctuations in the size classes of PM in the water column. However, our results also suggest that in the upper layer additional driving forces such as the increase of the level of turbulence after a wind event or the modification of the zoo- and phytoplankton community can influence the PM temporal evolution. (C) 2000 Elsevier Science Ltd. All rights reserved.