Eutrophication overcoming carbonate precipitation in a tropical hypersaline coastal lagoon acting as a CO2 sink (Araruama Lagoon, SE Brazil)

Cotovicz, Luiz C.; Knoppers, Bastiaan A.; Régis, Carolina Ramos; Tremmel, Daniel; Costa-Santos, Suzan; Abril, Gwénaël

doi:10.1007/s10533-021-00842-3

Cited by 16 publications

(3 citation statements)

References 100 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These patterns may vary over time, depending on local oceanographic and biological processes, and different anthropogenic pressures (e.g. Padin et al, 2010;Cotovicz et al, 2019;Cotovicz et al, 2020b;Marotta et al, 2020;Cotovicz et al, 2021;Valerio et al, 2021;Carvalho et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Sea-air CO 2 fluxes along the Brazilian continental margin

Affe¹,

Rocha

Piedras

et al. 2023

Ocean Coast. Res.

View full text Add to dashboard Cite

Ocean and Coastal ResearchMeasurements of the marine carbonate system on tropical and subtropical continental margins are poorly distributed in space and time, with many uncertainties persisting regarding the role of carbon exchanges at the ocean-atmosphere interface in these areas. To calculate sea-to-air CO 2 fluxes in Marine Ecoregions along the Brazilian continental margin (4°N to 34°S), we used data from the Surface Ocean CO 2 Atlas (SOCAT v2020), collected up to 400 km from the coast, at the surface (5 m), between 1991 and 2018, with the aim of investigating the role of ecoregions as potential sinks or sources of atmospheric CO 2 . The temperature and salinity of seawater presented variability in the north-south direction mainly because of the broad latitudinal range, reflecting typical patterns of tropical (T = 27.4°C ±1.49; S = 36.4 ±1.91) and subtropical waters (T = 22.8°C ±3.41; S = 35 ±2.91), in addition to the greater or lesser influence of river inputs in each ecoregion. The pCO 2 values in the surface waters varied from 121.81 (Amazon) to 478.92 µatm (Eastern), differing significantly between ecoregions and showing an expected decadal increasing trend, both in the atmosphere and in the seawater. The calculated values of CO 2 fluxes showed non-homogeneous spatio-temporal variations, from -24.37 mmol m -2 d -1 (Rio Grande) to 9.87 mmol m -2 d -1 (Southeastern). Throughout the analyzed time series, we observed that the Northeast, Amazon and Eastern ecoregions acted predominantly as sources of CO 2 and the Southeastern ecoregions and, mainly, Rio Grande, acted predominantly as sinks of atmospheric CO 2 .

show abstract

Section: Discussionmentioning

confidence: 99%

Sea-air CO 2 fluxes along the Brazilian continental margin

Affe¹,

Rocha

Piedras

et al. 2023

Ocean Coast. Res.

View full text Add to dashboard Cite

show abstract

“…In nearby Araruama Lagoon, which is hypersaline and eutrophic but much larger than Lagoa Vermelha, eutrophication changed the ecosystem metabolism from net heterotrophic, benthic-dominated, and limited by phosphorus in 1993-1995, to net autotrophic, planktonic-dominated in 2017 [Knoppers et al, 1996, Cotovicz et al, 2021. In Araruama Lagoon, increased photosynthesis in phytoplankton driven by eutrophication consumes most of the dissolved inorganic carbon (DIC) and modulates alkalinity, decreasing the saturation state and the amount of precipitated CaCO 3 [Cotovicz et al, 2021]. Similarly, increased photosynthesis in the water column due to eutrophication could interfere with CaCO 3 precipitation in Lagoa Vermelha, including the stromatolites.…”

Section: Life and Death Of Stromatolites From Lagoa Vermelhamentioning

confidence: 99%

Death and taphonomy of Holocene stromatolites from Lagoa Vermelha, Brazil

Keim,

Farina

2023

Comptes Rendus. Géoscience

View full text Add to dashboard Cite

Stromatolites are laminated rocks, comprising both authigenic and allochthonous materials, which arise under strong influence of both microorganisms and environmental conditions. Growing stromatolites are rare nowadays, limiting our understanding on how microbial mats produce stromatolites. Stromatolites from Lagoa Vermelha in Brazil were claimed as living, lithifying structures several years ago, but recently have been reported as dead, bleached skeletons. Here we confirm that they are currently not forming new laminae. This was confirmed by the absence of the microbial mat coat, enabling colonization of exposed surfaces by barnacles, boring cyanobacteria, and burrowing metazoans, which contributed to erosion and loss of some original features while adding new, distinct biomarkers.

show abstract

“…Coastal lagoons are formed by water bodies connected to the ocean through inlets and their salinity, can thus range from fresh to hypersaline (Kjerfve, 1994). The nutrient enrichment in these coastal lagoons is high in autochthonous, allocthonous, or anthropic origin (Cotovicz Jr. et al ., 2021). Coastal lagoon environments provide ecosystem services such as recreation and hydrobiological resources, v.g ., fish and crustaceans to support populations living in surrounding areas (Guimarães et al ., 2022).…”

Section: Introductionmentioning

confidence: 99%

The Geochemical Sedimentary Record of a Historically Anthropogenically Impacted Coastal Lagoon (Rio de Janeiro State, Southeastern Brazil)

de Freitas,

de Oliveira Pompermayer,

de Oliveira Santos

et al. 2023

Journal of Coastal Research

View full text Add to dashboard Cite

Eutrophication overcoming carbonate precipitation in a tropical hypersaline coastal lagoon acting as a CO2 sink (Araruama Lagoon, SE Brazil)

Abstract: technical assistance in stable isotopes measurements. Luiz C. Cotovicz Jr. thanks the Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP) for a visiting researcher grant (No.

Cited by 16 publications

References 100 publications

Sea-air CO 2 fluxes along the Brazilian continental margin

Sea-air CO 2 fluxes along the Brazilian continental margin

Death and taphonomy of Holocene stromatolites from Lagoa Vermelha, Brazil

The Geochemical Sedimentary Record of a Historically Anthropogenically Impacted Coastal Lagoon (Rio de Janeiro State, Southeastern Brazil)

Contact Info

Product

Resources

About