A juvenile journey: Using a highly resolved 3D mooring array to investigate the roles of wind and internal tide forcing in across-shore larval transport

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Kelley McBride, Jennifer MacKinnon, Peter J. S. Franks, Jacqueline M. McSweeney, Amy F. Waterhouse, André Palóczy, John Colosi, Jamie MacMahan
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Abstract

The across-shore transport of meroplanktonic larvae is predominantly driven by coastal physical processes, resulting in episodic recruitment of benthic species. Historically, due to the sampling challenges associated with resolving these advective mechanisms across the continental shelf, relevant components of larval transport have been difficult to isolate and understand. We use three-dimensional temperature and velocity data from an array of 29 moorings to identify fundamental physical processes that could have generated successful across-shore transport and settlement of meroplankton. The dense spatial and temporal sampling from this array allows us to use Lagrangian particle tracking to estimate the influences of wind conditions and the internal tide on the across-shore transport of planktonic larvae. Settlement was found to be episodic at all depths studied. Above mid-water, modeled larvae were successfully transported onshore by the internal tide during wind relaxations. Surprisingly, abundant pulses of shallow-water larvae were supplied to the coast on occasions when strong, upwelling-favorable winds (> 4 m s−1) drove offshore-flowing surface waters, revealing a complex, potentially topographically influenced flow. These intense upwelling-favorable winds also contributed to subsurface onshore flows that created large pulses of larval settlement in deeper waters (> 20 m). Our analyses from this highly resolved data set provide novel insights into the interactions of physical drivers in creating episodic pulses of coastal larval recruitment.

Abstract Image

幼体之旅:利用高分辨率三维系泊阵列研究风力和内潮对幼体跨岸迁移的影响
经向浮游幼体的跨岸迁移主要是由沿岸物理过程驱动的,从而导致底栖物种的偶发性 招募。从历史上看,由于解决这些跨大陆架平流机制所面临的取样难题,幼体迁移的相关组 成部分一直难以分离和理解。我们利用由 29 个锚系设备组成的阵列提供的三维温度和速度数据,确定了可能导致浮游鱼类成功跨岸迁移和定居的基本物理过程。通过该阵列的密集时空取样,我们可以利用拉格朗日粒子跟踪技术来估计风力条件和内潮对浮游幼虫跨岸迁移的影响。在研究的所有深度,沉降都是偶发性的。在中层水以上,模型中的幼虫在风力减弱时被内潮成功地输送到岸上。令人惊奇的是,在强上升流顺风(4 m s-1)推动离岸表层水流动的情况下,大量浅水幼体涌向海岸,显示了复杂的、可能受地形影响的水流。这些强烈的上升流顺风也促进了表层下的陆上水流,在深水区(20 米)形成了大量的幼虫沉降脉冲。我们对这一高分辨率数据集的分析,为了解物理驱动因素在形成沿岸幼体招募的偶发脉冲过程中的相互作用提供了新的见解。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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