Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil)
Abstract This study aimed to estimate the nutrients concentration variability in the São Francisco estuary from observed data during the summer and winter seasons of 2014 and to assess the influence of outflow discharges, circulation and precipitation on nutrients fluxes exchange. The marginal diffe...
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Sociedade Brasileira de Meteorologia
2020-12-01
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| Series: | Revista Brasileira de Meteorologia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862020000500803&tlng=en |
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| author | Edmara Ramos Melo Nilva Brandini Paulo Ricardo Petter Medeiros Rosiberto Silva Geórgenes Cavalcante |
| author_facet | Edmara Ramos Melo Nilva Brandini Paulo Ricardo Petter Medeiros Rosiberto Silva Geórgenes Cavalcante |
| author_sort | Edmara Ramos Melo |
| collection | DOAJ |
| description | Abstract This study aimed to estimate the nutrients concentration variability in the São Francisco estuary from observed data during the summer and winter seasons of 2014 and to assess the influence of outflow discharges, circulation and precipitation on nutrients fluxes exchange. The marginal difference in the streamflow (1,160 m3/s - summer; 1,260 m3/s - winter) reflected the small role of the river discharge on the variability of the nutrients load. The increase in the sediments load from February (13189.70 T/month) to July (36088.56 T/month) revealed that high precipitation (153.6 mm - winter; 37.6 mm - summer) and internal circulation might have contributed to enhancing the sediment budge towards the estuary mouth. The strong current velocity in July (~0.9 m/s) revealed more potential to export estuarine waters towards the coast when compared to ~0.7 m/s (February). The concentrations and nutrients load were higher during the winter season led by phosphate (3.70 μgL-1) and NID (83.64 μg L-1), against (1.38 μgL-1 and 30.70 μgL-1 - summer), except for silicates with 4.20 mgL-1 (summer) and 3.59 mgL-1 (winter). Despite the active control of outflows, the internal circulation, followed by local precipitation, are considered the main mechanisms behind the increased nutrients load within the estuary. |
| first_indexed | 2024-12-20T15:30:46Z |
| format | Article |
| id | doaj.art-4b651fcb5776464492f8fa23931859ef |
| institution | Directory Open Access Journal |
| issn | 1982-4351 |
| language | English |
| last_indexed | 2024-12-20T15:30:46Z |
| publishDate | 2020-12-01 |
| publisher | Sociedade Brasileira de Meteorologia |
| record_format | Article |
| series | Revista Brasileira de Meteorologia |
| spelling | doaj.art-4b651fcb5776464492f8fa23931859ef2022-12-21T19:35:36ZengSociedade Brasileira de MeteorologiaRevista Brasileira de Meteorologia1982-43512020-12-0135spe80381110.1590/0102-7786355000007Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil)Edmara Ramos Melohttps://orcid.org/0000-0002-3367-8710Nilva Brandinihttps://orcid.org/0000-0001-8947-9537Paulo Ricardo Petter Medeiroshttps://orcid.org/0000-0002-7314-0464Rosiberto Silvahttps://orcid.org/0000-0001-7152-0095Geórgenes Cavalcantehttps://orcid.org/0000-0002-2387-4494Abstract This study aimed to estimate the nutrients concentration variability in the São Francisco estuary from observed data during the summer and winter seasons of 2014 and to assess the influence of outflow discharges, circulation and precipitation on nutrients fluxes exchange. The marginal difference in the streamflow (1,160 m3/s - summer; 1,260 m3/s - winter) reflected the small role of the river discharge on the variability of the nutrients load. The increase in the sediments load from February (13189.70 T/month) to July (36088.56 T/month) revealed that high precipitation (153.6 mm - winter; 37.6 mm - summer) and internal circulation might have contributed to enhancing the sediment budge towards the estuary mouth. The strong current velocity in July (~0.9 m/s) revealed more potential to export estuarine waters towards the coast when compared to ~0.7 m/s (February). The concentrations and nutrients load were higher during the winter season led by phosphate (3.70 μgL-1) and NID (83.64 μg L-1), against (1.38 μgL-1 and 30.70 μgL-1 - summer), except for silicates with 4.20 mgL-1 (summer) and 3.59 mgL-1 (winter). Despite the active control of outflows, the internal circulation, followed by local precipitation, are considered the main mechanisms behind the increased nutrients load within the estuary.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862020000500803&tlng=enriver dischargenutrients loadSão Francisco estuary |
| spellingShingle | Edmara Ramos Melo Nilva Brandini Paulo Ricardo Petter Medeiros Rosiberto Silva Geórgenes Cavalcante Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil) Revista Brasileira de Meteorologia river discharge nutrients load São Francisco estuary |
| title | Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil) |
| title_full | Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil) |
| title_fullStr | Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil) |
| title_full_unstemmed | Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil) |
| title_short | Nutrients Load Estimation in a Regulated Streamflow Estuary: The São Francisco Estuary (NE/Brazil) |
| title_sort | nutrients load estimation in a regulated streamflow estuary the sao francisco estuary ne brazil |
| topic | river discharge nutrients load São Francisco estuary |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-77862020000500803&tlng=en |
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