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
Kelley McBride, Jennifer MacKinnon, Peter J. S. Franks, Jacqueline M. McSweeney, Amy F. Waterhouse, André Palóczy, John Colosi, Jamie MacMahan
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引用次数: 0
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.
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.