Sediment loads in the Amazon River

Meade, Robert H.; Nordin, Carl F.; Curtis, William F.; Rodrigues, Flavio M. Costa; Vale, C.; Edmond, John M.

doi:10.1038/278161a0

Cited by 131 publications

(53 citation statements)

References 5 publications

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“…On the same day that the discharge was measured the total suspended load of particles (less than 63 #m) at Obidos was 238 mg/kg (R. Meade, personal communication, 1983), which is considerably higher than the annual mean of 163 mg/kg [Meade et al, 1979]. The total suspended load at the river end-member during our investigation was 114 mg/kg near the surface and 127 mg/kg near the bottom.…”

Section: Hydrographymentioning

confidence: 88%

Distribution and flux of ²²⁶Ra and ²²⁸Ra in the Amazon River estuary

Key¹,

Stallard²,

Moore³

et al. 1985

J. Geophys. Res.

113

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Section: Hydrographymentioning

confidence: 88%

Distribution and flux of ²²⁶Ra and ²²⁸Ra in the Amazon River estuary

Key¹,

Stallard²,

Moore³

et al. 1985

J. Geophys. Res.

113

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“…The Amazon River exhibits the largest discharge volume (5.5x1012 m3.year -1 ) and drainage basin size (6x106 km2) in the world (GIBBS, 1967;MEADE et al, 1979). The suspended matter transported by the Amazon is approximately 800x10 6 tons (MARTINEZ et al, 2009).…”

Section: Study Areamentioning

confidence: 99%

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

et al. 2015

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The spatial distribution of the southern brown shrimp Farfantepenaeus subtilis (Pérez-Farfante, 1967) was studied based on industrial fishing fleet activities and is associated with geological and oceanographic characteristics of the benthonic environments on the Amazon continental shelf. Using a geographical information system (GIS) this paper sought to calculate the relative abundance of brown shrimp based on catch per unit effort (CPUE) and compare it with bathymetry, type of sedimentary structure, sedimentation rate and bottom salinity. As a result, we have concluded that the relative abundance (in terms of CPUE) is not uniformly distributed in space. Spatial analysis indicates that commercial trawling efforts were made in the (foreset) region of the subaqueous Amazon delta at depths of 40 to 60 m. In this region, prawn are responsible for the bioturbation of the sediments and the creation of a sedimentary structure called mottled mud. In the foreset region, sedimentation rates progressively increased up to 10 cm.yr-1; re-suspension was reduced and bottom salinity was high (~ 36). It appears that all of these factors define a stable muddy area with intense bioturbation. This notable biological activity is to be explained by the occurrence of a high F. subtilis abundance that appears to originate in a microbial loop. We concluded that by combining fishery information with environmental data from a GIS, it was possible to identify abundance distribution patterns for southern brown shrimp and other economically important fishery resources and to understand how they change on a large spatial-scale.

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“…1). According to Meade et al (1979), the discharge in the Brazil Amazon is estimated from the stage-discharge relationships that have been developed by Hidrologia S.A. and Companhia de Pesquisa de Recursos Minerais (CPRM). The river stage is measured daily and discharge is estimated monthly or bi-monthly at each station.…”

Section: Runoffmentioning

confidence: 99%

The Water Budget in the Amazon River Basin during the FGGE Period

Matsuyama

1992

Journal of the Meteorological Society of Japan

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The seasonal change of the water budget in the Amazon river basin during the FGGE period is investigated, using the global objective analyzed data set, precipitation data and river discharge data. Substituting these data into the atmospheric water balance equation and that of the basin, the evapotranspiration and relative value of basin storage are estimated and the relationships of water balance terms are examined.The annual water vapor flux convergence, calculated using the FGGE "main" III-b data set analyzed at the European Centre for Medium-Range Weather Forecasts, is estimated to be smaller than the annual runoff obtained by river discharge data. This is due to the characteristics of this global objective analyzed data set that it is made by the 4-dimensional data assimilation method which expresses the divergence and convergence of wind in the tropics as weaker than in the real state. The seasonal change pattern of precipitation shows good correspondence to that of water vapor flux convergence, which is multiplied by the factor 1.37 in order that its annual value meets the annual runoff. Evapotranspiration, estimated by the atmospheric water balance equation, remains almost constant within a year and the seasonal change of basin storage is very large. This result indicates that evapotranspiration in the entire Amazon river basin is not affected by the seasonal change of basin storage even in the dry season.The evapotranspiration ratio (evapotranspiration/precipitation) of the dry season is larger than that of the rainy season. It is concluded that the role of evapotranspiration on the water cycle in the Amazon river basin is relatively more important in the dry season than in the rainy season.

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Sediment loads in the Amazon River

Cited by 131 publications

References 5 publications

Distribution and flux of ²²⁶Ra and ²²⁸Ra in the Amazon River estuary

Distribution and flux of ²²⁶Ra and ²²⁸Ra in the Amazon River estuary

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

The Water Budget in the Amazon River Basin during the FGGE Period

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Sediment loads in the Amazon River

Cited by 131 publications

References 5 publications

Distribution and flux of 226Ra and 228Ra in the Amazon River estuary

Distribution and flux of 226Ra and 228Ra in the Amazon River estuary

Spatial distribution of southern brown shrimp (Farfantepenaeus subtilis) on the Amazon continental shelf: a fishery, marine geology and GIS integrated approach

The Water Budget in the Amazon River Basin during the FGGE Period

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Distribution and flux of ²²⁶Ra and ²²⁸Ra in the Amazon River estuary

Distribution and flux of ²²⁶Ra and ²²⁸Ra in the Amazon River estuary