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Modelling the effect of a slope-water intrusion on advection of fish larvae in May 1995 on Georges Bank
Manning, J.P.; Lough, R.G.; Naimie, C.E.; Churchill, J.H. (2001). Modelling the effect of a slope-water intrusion on advection of fish larvae in May 1995 on Georges Bank. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 58(5): 985-993
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139, more
Peer reviewed article  

Also published as
  • Manning, J.P.; Lough, R.G.; Naimie, C.E.; Churchill, J.H. (2001). Modelling the effect of a slope-water intrusion on advection of fish larvae in May 1995 on Georges Bank, in: Daan, N. et al. Recruitment dynamics of exploited marine populations: physical-biological interactions. Part 2: Proceedings of an ICES Symposium held in Baltimore, Maryland, USA 22-24 September 1997. ICES Marine Science Symposia, 214: pp. 985-993, more

Available in Authors 
Document type: Conference

Keywords
    Advection; Drifters; Fish larvae; Jets; Modelling; ANW, Georges Bank [Marine Regions]; Marine

Authors  Top 
  • Manning, J.P., correspondent
  • Lough, R.G.
  • Naimie, C.E.
  • Churchill, J.H.

Abstract
    In the spring of 1995, an intrusion of warm/salty slope water occurred on the southern flank of Georges Bank. As observed on several cross-bank hydrographic and acoustic Doppler current profiler sections, this intrusion resulted in a narrow (10 km) but intense shelfbreak jet (30 cm s-1 westward residual) in the near-surface waters. A satellite tracked drifter with a drogue located in the core of this jet (15 m) travelled 120 km to the west in 5.5 d. To examine this process and demonstrate the potential redistribution of fish larvae (collected with bongo net hauls) in the presence of a slope-water intrusion, a finite-element 3D circulation model has been initialized with the observed CTD density field. Moored velocity records are assimilated into the model to estimate the oceanic boundary elevations of a limited-area grid. The simulated particle tracks indicate enhanced along-bank flow relative to the long-term seasonal mean and a downwelling convergence zone in the vicinity of the shelf/slope front. The model resolves most of the subtidal flow and provides insight into the vertical advection of the animals and potential mechanisms of retention and loss.

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