Relevance of sporadic upwelling events on primary productivity: The key role of nitrogen in a gulf of SW Atlantic Ocean

Paparazzo, Flavio Emiliano; Martinez, Regina Pierattini; Fabro, Elena; Gonçalves, Rodrigo J.; Crespi-Abril, Augusto César; Soria, Gaspar; Barbieri, Elena A.; Almandoz, Gastón O.

doi:10.1016/j.ecss.2020.107123

Cited by 8 publications

(7 citation statements)

References 60 publications

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“…The low export rate in WSC is evidenced by comparing the data of the present work with those shown byPaparazzo et al (2021) in a gulf of the South West Atlantic Ocean (Fig.6). Under the assumption of steady state, ρNO 3 − is directly proportional to C export(Eppley and Peterson 1979).It should be noted that ρNO 3 − is the product of the speci c rate of NO 3 − uptake (vNO 3 − ) and particulate N biomass (PON), i.e.ρNO 3 − = vNO 3 − * PON.…”

supporting

confidence: 63%

The Weddell-Scotia Confluence during summer: An ecosystem where ammonium is worth gold

Paparazzo

2023

Preprint

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The Uptake of nitrogen sources in the Weddell-Scotia Confluence shows different nutritional conditions than other oceanic and neritic sectors. In this ecosystem, ammonium plays a leading role, either as a product of biological activities or as a trigger for them. During the summer of 2012, aboard the R/V Puerto Deseado, the area was visited and a series of stations were sampled. The objective of this work was to study the use of nitrogen sources and complement with associated parameters to link them to biological production. Experiments were carried out on board to estimate the uptake of nitrogen sources, and temperature and salinity were measured in situ. In addition, nitrate (NO3−), ammonium (NH4+), phosphate (PO4 − 3), silicic acid (Si(OH)4) and chlorophyll-a (Chlo-a) concentration was measured in the CESIMAR laboratory. The spatial interpretation was complemented with satellite images of sea surface temperature and chlorophyll-a. The main results were: high allochthonous macronutrients (NO3−: 13.36–25.53 µM; PO4 − 3: 1.51–1.90 µM; Si(OH)4: 34.5–62.8 µM) and low Chlo-a (0.44–0.76 mg.m− 3) concentration; nitrate uptake apparently limited by factors unrelated to its availability; a strong preference for ammonium uptake as a nitrogen source (negatively correlated; r = -0.99); low primary productivity estimated as total nitrogen uptake (TNU: 8.9-14.23 nM.d− 1); and its consequent low export rate of carbon. Due to the importance of this ecosystem for relevant biological species such as krill, and the important role it plays in the formation of deep waters, it is essential to keep a monitoring over time that allow estimating its evolution.

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supporting

confidence: 63%

The Weddell-Scotia Confluence during summer: An ecosystem where ammonium is worth gold

Paparazzo

2023

Preprint

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“…On the other hand, an upward movement of water on the coast (coastal upwelling) has been observed in the south-western sector due to the intense ₃₂₇ winds in the region (Pisoni et al 2020). This upwelling was previously predicted from models (Tonini et al 2006;Matano and Palma 2018), and as a consequence, an increase in primary productivity was observed (Paparazzo et al 2021).…”

Section: Study Areamentioning

confidence: 53%

“…Sommer (1989) suggested that the nutrient requirements for each phytoplankton species are a key factor in regulating the composition of the phytoplankton community. Paparazzo et al (2021) showed a great variation in the composition of the phytoplankton communities in the gulf. Although the adaptation of communities to changes in nitrogen sources is made clear, we consider that the availability of Si(OH) 4 could complement the interpretation of the system.…”

Section: D��mentioning

confidence: 98%

“…was reported as a limiting nutrient for primary producers, in some stations measured during this work, Si(OH) 4 was also a limiting nutrient. Paparazzo et al (2021) suggested that during the period studied (November 2016), when NO 3 was low, NH 4 + played an important role for primary productivity due to the low water exchange in the column and the optimal relationship between preference and N availability in the environment. In addition, the authors discusses the type of primary production (new or regenerated) which depends on the least available nitrogen source.…”

Section: D��mentioning

confidence: 99%

“…Strong W-NW winds 48 h before our 2016 sampling generated the frontal conditions observed in our results. Paparazzo et al (2021) showed that this upwelling generates a sudden change in nutrient availability and increase primary productivity. It was corroborated in our data in the SW and SM transects of 2016.…”

Section: D��mentioning

confidence: 99%

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Southern coastal system of the San Jorge Gulf during spring

2023

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A��. The San Jorge Gulf was declared an area of national economic, commercial, conservation and diversity interest. To contribute to its study, the southern coastal sector of the gulf was characterised in physical and chemical parameters in spring campaigns (November 2016 and 2017). Samples were taken on board the oceanographic vessel Puerto Deseado in three perpendicular to the coast transects and another one to the southeast of the gulf, which crosses a thermohaline front. The perpendicular to the coast transects showed a similar pa�ern of distribution of physical and chemical properties in the water column. At nearshore stations, the water column was homogeneous and the nutrient concentrations between the surface and bo�om layers were similar. At offshore stations, the water column was stratified and the nutrient concentrations were higher near the bo�om than at surface. In 2016, a wind induced upwelling front was observed in the southwest of the gulf. Both sides of the thermohaline front did not show significant chemical differences. Throughout the study area, silicic acid and nitrate limited primary production. Satellite chlorophyll-a data and fluorescence profiles showed that the southern sector of the gulf has a high biomass of phytoplankton during November. We conclude that the southern sector of the SJG has different features depending on the external forcing caused by the front. The presence of fronts stimulates the growth of phytoplankton biomass through the injection of nutrients from the homogeneous part to the stratified sector. This would affect phytoplankton community and, thus, the productivity of the system.

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The role of the low-salinity, high-nitrate layer as a novel lateral mechanism for nutrient supply into the San Jorge Gulf (Patagonian Shelf) during mid-summer

Carbajal

Chavanne

2023

Continental Shelf Research

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Relevance of sporadic upwelling events on primary productivity: The key role of nitrogen in a gulf of SW Atlantic Ocean

Cited by 8 publications

References 60 publications

The Weddell-Scotia Confluence during summer: An ecosystem where ammonium is worth gold

The Weddell-Scotia Confluence during summer: An ecosystem where ammonium is worth gold

Southern coastal system of the San Jorge Gulf during spring

The role of the low-salinity, high-nitrate layer as a novel lateral mechanism for nutrient supply into the San Jorge Gulf (Patagonian Shelf) during mid-summer

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