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首页> 外文期刊>Ocean Science Discussions >Seasonal variability of phytoplankton fluorescence in relation to the Straits of Messina (Sicily) tidal upwelling
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Seasonal variability of phytoplankton fluorescence in relation to the Straits of Messina (Sicily) tidal upwelling

机译：浮游植物荧光的季节性变化与墨西拿（西西里岛）海潮上升有关

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In the Straits of Messina the large gradients of tidal displacements as well as the topographic constrictions determine the upwelling of deeper waters in the surface layer. This work describes the seasonal variability of surface distribution of phytoplankton biomass depending on upwelling phenomena. Temperature, salinity, nitrates and phytoplankton fluorescence were measured in 1994 and 1995 by continuous underway surface real-time measurements on board dedicated research boats. Each survey was performed following the dynamic phases of flooding and ebbing tides. Tidal currents are essentially southward during the high tide and northward during the low tide. During the low water slack, large spatial gradients of physical-chemical and biological parameters were mainly found, while in the high water slack a diffused phytoplankton fluorescence was observed only in autumn, in coincidence of a seasonal thermocline. Salinity, nitrate and chlorophyll-a fluorescence data revealed a significant positive intercorrelation, whereas they are inversely correlated with temperature. Generally, during winter, the upwelling distribution was limited to narrow zones, while in summer it involved the middle of the Straits and southern zones. During spring in the southern zone of the Straits, maximum of chlorophyll-a fluorescence was detected (May 1995, 0.32 μg-Chla l-1); in summer, when back and forth tidal movements become intense between the Tyrrhenian and the Ionian seas, values was everywhere lower. The data set from continuous and repeatable acquisition has allowed the study of different time-space scales in the Straits of Messina, a very strong dynamic environment. The Straits system can be compared to an "intermittent pump" which, during the different seasons, before enriched itself and then it provides nutrients to the surrounding basins.
机译：在墨西拿海峡，潮汐位移的大梯度以及地形收缩决定了表层深水上升的趋势。这项工作描述了浮游生物质表面分布的季节性变化取决于上升现象。在1994年和1995年，通过在专用研究船上连续进行地表实时测量，测量了温度，盐度，硝酸盐和浮游植物的荧光。每次调查都是在洪水和退潮的动态阶段之后进行的。潮汐在涨潮时基本上向南，在退潮时则向北。在低水位松弛期间，主要发现了较大的理化和生物学参数空间梯度，而在高水位松弛区域，仅在秋季观察到了浮游植物的荧光扩散，这与季节性的温跃层吻合。盐度，硝酸盐和叶绿素-a荧光数据显示出显着的正相关，而与温度呈负相关。通常，在冬季，上升流的分布仅限于狭窄的区域，而在夏季，它涉及海峡中部和南部区域。在春季海峡南部地区，检测到最大的叶绿素-a荧光（1995年5月，0.32μg-Chlal -1 ）;在夏季，第勒尼安海与爱奥尼亚海之间来回的潮汐运动变得激烈时，各地的价值都降低了。来自连续和可重复采集的数据集允许在墨西拿海峡（一个非常强大的动态环境）中研究不同的时空尺度。可以将海峡系统与“间歇泵”进行比较，该泵在不同季节之前会先富集，然后再向周围的盆地提供营养。

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