The Influence Of Seasonality On Haline Zones In An Amazonian Estuary

Valentim, Micaela; Monteiro, Sury de Moura; Rollnic, Marcelo

doi:10.2112/si85-016.1

Cited by 6 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OCA works with a view to build new partnerships with ocean and coastal monitoring systems, being an initiative of local support for the training of researchers and information transfer. OCA has been supporting scientific development and publications such as tide propagation (Rollnic and Rosário, 2013;Prestes et al, 2017), discharge model (Borba and Rollnic, 2016;Prestes et al, 2020), Amazon Plume (Mascarenhas et al, 2016), salt intrusion in estuaries (Valentim et al, 2018), microplastic (Novaes et al, 2020), and meiofauna (Baia et al, 2021).…”

Section: Amazon Coastal Observatory (Oca)mentioning

confidence: 96%

Coastal Ocean Observing and Modeling Systems in Brazil: Initiatives and Future Perspectives

et al. 2021

Self Cite

View full text Add to dashboard Cite

Coastal ocean observing and modeling systems (coastal observatories), connected with regional and global ocean systems, improve the quality of information and forecasts for effective management of safe and sustainable maritime activities. The public availability of systematic and long-term information of the ocean is an engine for the Blue Economy, boosting economic growth, employment, and innovation. An overview of some Brazilian initiatives is presented in this paper, involving universities, private companies, federal and state agencies, covering institutions from south to north of Brazil. Although these initiatives focus mainly on ocean physics, integrated efforts can extend the scope to include biogeochemistry and marine biodiversity, helping to address interdisciplinary problems. Existing initiatives can be connected, and new ones fostered, to fill in the gaps of temporal and spatial coverage of ocean monitoring in the vast oceanic area under Brazilian jurisdiction (nationally referred to as the Blue Amazon, in reference to the similar richness of the Amazon Forest). The alignment among national and regional initiatives, as well as with international programs, can be promoted if coordinated by a national-level organization, maximizing the return of public investment and socioeconomic benefits. In light of international examples, possible future institutional arrangements are discussed, leveraging from existing national public policies and international cooperation that Brazil is taking part. The United Nations Decade of Ocean Science for Sustainable Development is a timely opportunity to encourage an institutional arrangement to support and articulate an integrated network of coastal observatories in Brazil.

show abstract

Section: Amazon Coastal Observatory (Oca)mentioning

confidence: 96%

Coastal Ocean Observing and Modeling Systems in Brazil: Initiatives and Future Perspectives

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The minimum temperatures occur in the rainy period (26 °C) and the maximum in the dry period (29 °C). The Mojuim estuary has a macrotidal regime, with an average height of 4.9 m during spring tide and 3.2 m during low tide (Rollnic et al, 2018). During the wet season the Mojuim River has a flow velocity of 1.8 m s -1 at the ebb tide and 1.3 m s -1 at the flood tide.…”

Section: Study Sitementioning

confidence: 99%

“…During the dry season, the maximum currents are 1.9 m s -1 at the flood and 1.67 m s -1 at the ebb tide (Rocha, 2015) The annual mean salinity is 26.95 ± 0.98 PSU (Valentim et al, 2018). The Mojuim River region is geomorphologically formed by partially submerged river basins consequent of an increase in the relative sea level during the Holocene (Prost et al, 2001) associated with the formation of mangroves, dunes, and beaches (El-Robrini et al, 2006).…”

Section: Study Sitementioning

confidence: 99%

Greenhouse gas fluxes in mangrove forest soil in the Amazon estuary

Castellón¹,

Cattânio

Berrêdo³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. Tropical mangrove forests are important carbon sinks, the soil being the main reservoir of this chemical element. Understanding the variability and the key factors that control fluxes is critical to account for greenhouse gas (GHG) emissions, especially in a scenario of global climate change. The current study is the first to quantify methane (CH4) and carbon dioxide (CO2) emissions using a dynamic chamber in Amazon natural mangrove soils. Sampling points were selected in a contrasting topographic gradient, the highest point being where flooding occurs only at high tides during the solstice and on the high tides of the rainy season of the new and full moons. The results showed that mangrove soils are sources of greenhouse gases, and CO2 fluxes were not different between seasons, and only in the dry period were they greater in the high topography. Only in the low topography, the CH4 fluxes were higher in the rainy season. However, in the dry period, the low topography soil produced more CH4. Soil organic matter, carbon and nitrogen ratio (C / N), and redox potential influenced the annual and seasonal variation of CO2 emissions; however, they did not influence CH4 flux. To account for global GHG emissions, in the Amazonian estuary mangrove soil produced 35.4 Mg CO2-eq ha−1 yr−1.

show abstract