Tracing the Early Development of Harmful Algal Blooms on the West Florida Shelf with the Aid of Lagrangian Coherent Structures.
Tracing the Early Development of Harmful Algal Blooms on the West Florida Shelf with the Aid of Lagrangian Coherent Structures.
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DOI：
10.1029/2007jc004533
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发表时间：
2007-08
影响因子：
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通讯作者：
M. J. Olascoaga;F. Beron-Vera;Larry E. Brand;Hüseyin Koçak
中科院分区：
文献类型：
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作者：
M. J. Olascoaga;F. Beron-Vera;Larry E. Brand;Hüseyin Koçak
人们提出了几种理论来解释西佛罗里达大陆架上有毒甲藻短卡雷氏菌（Karenia brevis）产生的有害藻华的发展。然而，由于HAB发展的早期阶段通常无法检测到，这些理论迄今为止很难得到证实。在本文中，我们采用模拟拉格朗日相干结构（LCSs）来追踪2004年底在它被运送到可以通过卫星图像检测到的地区之前，HAB发展的潜在早期位置。lcs是从数据同化HYCOM （HYbrid-Coordinate ocean Model）模拟产生的表层洋流中提取出来的，它构成了物质流体屏障，划定了有害藻华演化的潜在途径。利用一个简化的种群动态模型，我们推断出可能导致有害藻华发展的因素。种群动态模型确定了营养物和浮游植物两种成分中的氮，这两种成分被假设为由上述HYCOM模拟产生的表面洋流被动平流。为赤潮推断出两种营养来源，赤潮的进化被发现与模拟的lcs密切相关。这些营养源被发现位于近岸，可能是由于土地径流。
Several theories have been proposed to explain the development of harmful algal blooms (HABs) produced by the toxic dinoflagellate Karenia brevis on the West Florida Shelf. However, because the early stages of HAB development are usually not detected, these theories have been so far very difficult to verify. In this paper we employ simulated Lagrangian coherent structures (LCSs) to trace potential early locations of the development of a HAB in late 2004 before it was transported to a region where it could be detected by satellite imagery. The LCSs, which are extracted from surface ocean currents produced by a data-assimilative HYCOM (HYbrid-Coordinate Ocean Model) simulation, constitute material fluid barriers that demarcate potential pathways for HAB evolution. Using a simplified population dynamics model we infer the factors that could possibly lead to the development of the HAB in question. The population dynamics model determines nitrogen in two components, nutrients and phytoplankton, which are assumed to be passively advected by surface ocean currents produced by the above HYCOM simulation. Two nutrient sources are inferred for the HAB whose evolution is found to be strongly tied to the simulated LCSs. These nutrient sources are found to be located nearshore and possibly due to land runoff.