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80-1 Hydrographic observations off Savannah and Brunswick, Georgia (March, May, and September, 1977 and January 1978)

01 Jan 1980-

AbstractSeasonal onshore-offshore sections were run in March, May and September 1977 and January 1978 off Savannah and Brunswick, Georgia. In each instance upwelling was observed at the shelf break with significant nutrient fluxes into the surface and/or shelf waters. There are indications that eddies may have been responsible for some of these observations.

Topics: Hydrography (56%), Upwelling (51%)

Summary (1 min read)

Jump to: [DISCLAIMER] and [SAMPLING]

DISCLAIMER

  • Portions of this document may be illegible in electronic image products.
  • Images are produced from the best available original document.
  • The studies reported here were concentrated in the Georgia Bight near Brunswick and Savannah, Georgia.

SAMPLING

  • One or two onshore/offshore hydrographic sections were r u n during each crui se.
  • A Plessey Model 9400 CTD sensor system was attached below the array.
  • Niskin sampling depths were determined from the temperature structure.
  • Sal ini ty samples were analyzed conductometrical1y using a Plessey Model 6230 N laboratory salinometer.
  • Temperature was determined with deep sea reversing thermometers, XBT's and the CTD system.

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Journal ArticleDOI
Abstract: Sediment samples were collected at stations along cross-shelf transects in Onslow Bay, North Carolina, during two cruises in 1984 and 1985. Station depths ranged from 11 to 285 m. Sediment chlorophyll a concentrations ranged from 0·06 to 1·87 μg g −1 sediment (mean, 0·55), or 2·6–62·0 mg m 2 . Areal sediment chlorophyll a exceeded water column chlorophyll a a at 16 of 17 stations, especially at inshore and mid-shelf stations. Sediment ATP concentrations ranged from 0 to 0·67 μg g −1 sediment (mean, 0·28). Values for both biomass indicators were lowest in the depth range including the shelf break (50–99 m). Organic carbon contents of the sediments were uniformly low across the shelf, averaging 0·159% by weight. Photography of the sediments revealed extensive patches of microalgae on the sediment surface. Our data suggest that viable benthic microalgae occur across the North Carolina continental shelf. The distribution of benthic macroflora on the North Carolina shelf indicates that sufficient light and nutrients are available to support primary production out to the shelf break. Frequent storm-induced perturbations do not favour settling of phytoplankton, an alternative explanation for the presence of microalgal pigments in the sediments. Therefore, we propose that a distinct, productive benthic microflora exists across the North Carolina continental shelf.

63 citations


Journal ArticleDOI
Abstract: A review and analysis of historical and new hydrographic data are presented for the Charleston Bump region. An area of doming isotherms is identified primarily between 31.5/sup 0/ and 34.5/sup 0/N and the 200 and 400 m isobaths. The highest incidences of doming are found off Long Bay (86%). Cape Fear (38%), and Cape Romain (25%). Evidence suggests that low salinity shelf water collects in the doming area off Long Bay in July and that seasonal fluctuations in the depth of the main thermocline layer in this area are linked to Gulf Stream transport and local winds. At times there is a gradual offshore-onshore movement of the Gulf Stream opposite Long Bay roughly following the 400 m isobath and at other times an abrupt eastward movement near 32/sup 0/N. Much of the time there appears to be a direct seasonal relationship between historical seasonal velocity fields and offshore deflection with higher (lower) velocities corresponding to greater (lesser) deflection.

39 citations