Phytoplankton blooms on the western shelf of Tasmania: evidence of a highly productive ecosystem
Phytoplankton blooms on the western shelf of Tasmania: evidence of a highly productive ecosystem
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塔斯马尼亚西部陆架浮游植物大量繁殖：高产生态系统的证据
DOI：
10.5194/os-11-1-2015
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发表时间：
2014
期刊：
影响因子：
3.2
通讯作者：
J. Kämpf
中科院分区：
文献类型：
--
作者：
J. Kämpf
抽象的。使用标准NASA-OC3(海洋颜色)算法的卫星获取的叶绿素a数据受到河流排放的有色溶解有机物和悬浮沉积物的强烈偏差，这是塔斯马尼亚大陆架西部的一个特别问题。这项工作利用OC3数据和基于荧光线高度(FLH)数据的叶绿素荧光之间的二次回归重建了研究区域的浮游植物水华。这一回归是根据附近没有河流影响的邦尼上升区的卫星数据得出的。为此，对10年MODIS-AQUA卫星数据的分析表明，塔斯马尼亚大陆架西部存在一个高生产力的生态系统。该地区通常每年经历两次浮游植物水华。第一次水华发生在夏末的几个月，这是上升流有利的沿海风的结果。因此，塔斯马尼亚陆架西部形成了一个以前未知的区域上升流系统的上升流中心，被称为大南澳大利亚海岸上升流系统。第二次浮游植物水华是典型的春季水华，也是在邻近的塔斯曼海发展起来的。作者推测，该地区是区域海洋生态系统的又一个重要生物热点。
Abstract. Satellite-derived chlorophyll a data using the standard NASA-OC3 (ocean colour) algorithm are strongly biased by coloured dissolved organic matter and suspended sediment of river discharges, which is a particular problem for the western Tasmanian shelf. This work reconstructs phytoplankton blooms in the study region using a quadratic regression between OC3 data and chlorophyll fluorescence based on the fluorescence line height (FLH) data. This regression is derived from satellite data of the nearby Bonney upwelling region, which is devoid of river influences. To this end, analyses of 10 years of MODIS-aqua satellite data reveal the existence of a highly productive ecosystem on the western Tasmanian shelf. The region normally experiences two phytoplankton blooms per annum. The first bloom occurs during late austral summer months as a consequence of upwelling-favourable coastal winds. Hence, the western Tasmanian shelf forms a previously unknown upwelling centre of the regional upwelling system, known as Great South Australian Coastal Upwelling System. The second phytoplankton bloom is a classical spring bloom also developing in the adjacent Tasman Sea. The author postulates that this region forms another important biological hot spot for the regional marine ecosystem.