Observations of suspended material from spacecraft altitudes

Szekielda, Karl-Heinz

doi:10.1007/bf02226350

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…This simple correlation may be applicable in future efforts toward fishery resource management in upwelling areas. (from Szekielda( 1974)). …”

Section: Discussionmentioning

confidence: 96%

“…The most stationary gyre south of Cape Blanc was observed throughout the year and the offshore patterns noted in the Skylab images are influenced by the flow of the gyre. Szekielda (1974) reports that plankton patchiness varies especially with the change of seasons. A strong gradient of chlorophyll and/or plankton offshore of Cape Timiris is connected with the converging water masses from the Bane d'Arguin and has been detected in all four seasons.…”

Section: Cape Blancmentioning

confidence: 99%

“…Since the cold patch directly corresponds to the "U-shaped" suspended material pattern observed in the imagery, this is undoubtedly a source of upwelled water. In September of 1972, Dr. Ballester (Szekielda, 1974) observed a strong gradient of temperatures and fluorescence to the southwest of Cape Blanc. The temperature distribution is shown in Figure 11.…”

Section: Cape Blancmentioning

confidence: 99%

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Skylab investigation of the upwelling off the northwest coast of Africa

Szekielda

Suszkowski

Tabor

1977

ICES Journal of Marine Science

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The up welling off the NW coast of Africa in the vicinity of Cape Blanc was studied in FebruaryMarch 1974 from aircraft and in September 1973 from Skylab. The aircraft study was designed to determine the effectiveness of a differential radiometer in quantifying surface chlorophyll concentrations. Photographic images of the S190A Multispectral Camera and the S190B Earth Terrain Camera from Skylab were used to study distributional patterns of suspended material and to locate ocean color boundaries. The thermal channel of the SI92 Multispectral Scanner was used to map sea-surface temperature distributions offshore of Cape Blanc. Correlating ocean color changes with temperature gradients is an effective method of qualitatively estimating biological productivity in the upwelling region off Africa.

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“…This simple correlation may be applicable in future efforts toward fishery resource management in upwelling areas. (from Szekielda( 1974)). …”

Section: Discussionmentioning

confidence: 96%

Section: Cape Blancmentioning

confidence: 99%

Section: Cape Blancmentioning

confidence: 99%

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Skylab investigation of the upwelling off the northwest coast of Africa

Szekielda

Suszkowski

Tabor

1977

ICES Journal of Marine Science

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“…Some useful information, however, has already been gleaned from studies of multispectral data gathered by Landsat, although its sensors were not designed for such purposes. Semiquantitative estimates of suspended biomass were made by Szekielda (1974) in the ocean area off Northwest Africa using ERTS-1 measurements. The reflected infrared data from Landsat, especially the 0.7-0.7 pm channel, have been shown to be useful as a chlorophyll-a detector whenever concentrations exceed 10 pm l-', levels that are frequently observed in the Great Lakes (Strong, 1977).…”

Section: Ocean Colormentioning

confidence: 99%

Passive radiometry of the ocean from space—an overview

McClain

1980

Boundary-Layer Meteorol

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A brief description of unmanned Earth-observation platforms in space, and their ocean-related radiometric instrumentation, is given. Both operational and research-type spacecraft, current and near-future, are discussed. Some recent oceanographic studies and applications are reviewed, including the following topics: sea surface temperature, sea ice, ocean surface roughness and near-surface wind, and ocean color.

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“…The application of remote sensing to oceanography became more prevalent with the deployment of the Earth Resources Technology Satellite (Erts). Using Efts multispectral scanner data, workers were able to observe and semiquantify SPM in lakes [Strong, 1974], rivers [Kritikos et al, 1974], and the marine environment [Klemas et al, 1974;Szekielda, 1974;Szekielda and Duvall, 1976] and interpret near-surface circulation patterns from these data Strong, 1974;Klemas et al, 1974;Szekielda, 1974;Szekielda and Duvall, 1976]. From the above studies it is generally recognized that backscattered radiation from SPM is best detected on Erts multispectral scanner bands 4 (500-600 nm) and 5 (600-700 nm).…”

Section: Ticle-deficient Water Is Present At All Depths Over the Shelmentioning

confidence: 99%

Wind‐induced current flow in the upper Hudson Shelf Valley

Nelsen¹,

Gadd²,

Clarke³

1978

J. Geophys. Res.

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Drawing from wind and current meter data, an empirical, semiquantitative model has been developed for wind-induced current flow in the New York Bight apex portion of the Hudson Shelf Valley. Data have shown that winds from 270øT (ñ50 ø), blowing for at least 9 hours at speeds of greater than 5 m/s, can cause northward (upchannel) bottom flow in the shelf valley at velocities in excess of 40 cm/s. Southern (downchannel) flow is initiated by winds from 75øT (ñ35 ø) blowing for at least 6 hours at speeds of 4 m/s or more. Seasonal variation in the wind field results in predominant upchannel flow during October-April with downchannel flow throughout the rest of the year.

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Observations of suspended material from spacecraft altitudes

Cited by 5 publications

References 3 publications

Skylab investigation of the upwelling off the northwest coast of Africa

Skylab investigation of the upwelling off the northwest coast of Africa

Passive radiometry of the ocean from space—an overview

Wind‐induced current flow in the upper Hudson Shelf Valley

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