GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Brazil  (1)
  • flushing half-life  (1)
  • trophic state  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Porewater dynamics and the formation of iron sulfides in a mangrove ecosystem, Sepetiba Bay, Brazil (1999)
    Springer
    Mangroves and salt marshes 3 (1999), S. 85-93 
    Details
    ISSN: 1572-977X
    Keywords: Brazil ; iron sulfides ; mangroves ; porewater ; Sepetiba Bay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Porewater dynamics and the formation of iron sulfides were studied in the Brazilian mangrove. Porewater samples were collected during tidal cycles using in situ equipment and physical–chemical and chemical data were obtained. The advective transport of porewater by tidal currents was found to be more effective between 0 and 5 cm depth than below 15 cm. The diffusive input of atmospheric oxygen during low tides resulted in oxidation of porewater dissolved sulfides. Thermodynamic considerations identified pyrite as the main iron sulfide forming at this depth, and the amorphous iron hydroxides are probably the main iron source. Below 15 cm depth, irregular root distribution underground and benthic faunal bioturbation caused considerable spatial variation in a small scale (20 cm). The correlation between alkalinity and total dissolved sulfide suggests that the main pathway for organic matter decomposition is sulfate reduction. Formed in the highly sulfidic diagenetic zone, the dissolved iron went through iron sulfide formation process. Crystalline iron oxides like hematite and magnetite may constitute an important iron source below 15 cm, whereas pyrite is still the most probably occurring iron sulfide, according to thermodynamic considerations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009960218748
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Trophic state and water turn-over time in six choked coastal lagoons in Brazil (1991)
    Springer
    Biogeochemistry 14 (1991), S. 149-166 
    Details
    ISSN: 1573-515X
    Keywords: chlorophyll-a ; flushing half-life ; nutrients ; phosphorus loading ; trophic state ; water turn-over time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Comparison of total phosphorus and chlorophyll-a concentration, nutrient loading, and water turn-over time in six shallow choked lagoons along the coast of the state of Rio de Janeiro, Brazil, established that water turn-over time is related to the trophic state of the lagoons with additional anthropogenic nutrient loading affecting this relationship. Turnover time was calculated as a flushing half-life from rainfall, evaporation, runoff, and tidal exchange data, and trophic state was calculated from the quantity and quality of dissolved inorganic nutrients, total phosphorus, and chlorophyll-a standing stock. Flushing half-life of the lagoons ranged between 1 and 27 days, annual phosphorus areal loading from 3 to 18 mg m−2d−1, and chlorophyll-a standing stock from 6 to 160 mg M−2
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002903
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...