Chlorophyll enchancement and mixing associated with meanders of the shelf break front in the Mid-Atlantic Bight Public Deposited

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  • Meanders of the shelf break front in the Mid-Atlantic Bight (MAB) during April and May of 1997 were associated with chlorophyll enhancement along a hydrographic and a topographic feature. The hydrographic feature was the surface outcrop of the front, which ranged from ~10 to >100 km seaward of the shelf break owing to the meanders. The topographic feature was the shelf break (100-m isobath). Chlorophyll enhancement was observed by a satellite instrument, the ocean color and temperature sensor, and by a fluorometer in situ. It developed in near-surface waters typically nutrient depleted during late spring, thus local nutrient enrichment of near-surface waters was probable. Observations of sufficient resolution to define processes were available only for the region of shelf break chlorophyll enhancement . Along two meander troughs( shoreward extremities near the shelf break), we observed shoaling of cold shelf water. Shelf water shoaled >20 m along frontal-isopycnals, and phytoplankton absorption maxima coincided directly with the shoaled water. Thus local nutrient enrichment by along-isopycnal upwelling was the supported mechanism of chlorophyll enhancement at the shelf break. The basis for along-isopycnal upwelling was seaward flow of shelf water forced by meander circulation near the shelf break. Strong cross-isobath flow and mixing developed as these meanders propagated along the shelf break front of the MAB at a relatively constant rate of ~9 km day¯¹.
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  • Ryan, J. P., Yoder, J. A., Barth, J. A., and Cornillon, P. C., 1999, Chlorophyll enhancement and mixing associated with meanders of the shelfbreak front in the Mid-Atlantic Bight: J. Geophys. Res., v. 104, p. 23,479-23, 493.
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  • Journal of Geophysical Research
  • description.provenance : Made available in DSpace on 2010-04-15T21:33:35Z (GMT). No. of bitstreams: 1 Ryan et al JGR 1999.pdf: 2157213 bytes, checksum: e2dbe786b1c10f8dd03006fe59aebe58 (MD5) Previous issue date: 1999
  • Vol. 104 No. C10 (1999)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-04-15T21:33:35Z (GMT) No. of bitstreams: 1 Ryan et al JGR 1999.pdf: 2157213 bytes, checksum: e2dbe786b1c10f8dd03006fe59aebe58 (MD5)
  • description.provenance : Submitted by Mary Phan (mpscanner@gmail.com) on 2010-04-15T21:14:40Z No. of bitstreams: 1 Ryan et al JGR 1999.pdf: 2157213 bytes, checksum: e2dbe786b1c10f8dd03006fe59aebe58 (MD5)

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