Linking phytoplankton nitrogen uptake, macronutrients and chlorophyll- a in SW Atlantic waters: The case of the Gulf of San Jorge, Argentina

Paparazzo, Flavio Emiliano; Williams, Gabriela Noemí; Pisoni, Juan Pablo; Solis, Miriam Edith; Esteves, José Luís; Varela, Diana E.

doi:10.1016/j.jmarsys.2017.02.007

Cited by 16 publications

(13 citation statements)

References 39 publications

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“…Akselman (1996) suggested that water column stratification in the SJG influences nutrient distribution and availability for primary producers. Supporting this hypothesis, Krock et al (2015) observed low surface concentrations of nutrients in this region during autumn and high concentrations of inorganic nutrients at depths below 50 m. During the same cruise, a higher macronutrient surface concentration was reported in the northern gulf (Paparazzo et al, 2017) where tides ruptured the stratification. Fernández et al (2005) found seasonal variations in the chemical and physical conditions of sediment and bottom waters in the SJG.…”

Section: Introductionmentioning

confidence: 68%

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Torres¹,

Paparazzo²,

Williams³

et al. 2018

Oceanog

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Section: Introductionmentioning

confidence: 68%

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Torres¹,

Paparazzo²,

Williams³

et al. 2018

Oceanog

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“…This is relevant for the marine ecosystem in the Patagonian sea shelf because this sector has high levels of primary productivity (Garcia et al, 2008) and it is an important contributor to the global ocean CO 2 uptake from the atmosphere (Bianchi et al, 2009). Recent studies highlighted the sensitivity of this ecosystem to the deposition of nutrients contained in Patagonian dust (Cabrerizo et al, 2017;Paparazzo et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Temporal Characterization of Dust Activity in the Central Patagonia Desert (Years 1964–2017)

Gassó

Torres

2019

JGR Atmospheres

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Dust emitted from the southern end of South America (SSA) is transported long distances over the Southern Ocean and deposited over this marine ecosystem. Whether the nutrients released through dissolution have a biogeochemical impact is a question with biological as well as climate implications, yet there is no clear answer. Additionally, the provenance of dust recently found in accumulated snow in East Antarctica is still a matter of debate. The Patagonia desert in SSA is the likely source, but there are no detailed records documenting dust activity in this area, thereby preventing any definite assessments. Here we provide a survey of modern dust activity of the largest dust source in SSA, the lake Colhué Huapi in central Patagonia. We analyzed five decades (1964–2017) of surface synoptic observations (World Meteorological Weather Present weather codes) and concurrent satellite aerosol detection (UV Aerosol Index from the Total Ozone Monitoring Sensor and Ozone Monitoring Instrument detectors, 1978–2017). We assessed the seasonal, year‐to‐year variability and periods of major dust activity. Several periods of enhanced activity were found with roughly 2‐ to 10‐year duration each (1970–1976, 1989–1994, 1996–1997, and 1999–2017). While dust activity peaks during summer months, wintertime activity during the most active years can well exceed the summer average of nonactive years. For a period of coincident satellite observations, the occurrence of at least three periods of high activity is confirmed. Since satellite detection is more sensitive to mesoscale dust events, the large events that occurred during these periods brought abundant dust into the SW South Atlantic. Satellites with polar orbits tend to under detect dust events in this region. Significant cloudiness obstructs the direct view of dust, and dust activity tends to occur late in the afternoon after the overpass of polar satellites. These observations have a time span adequate for comparison with transport models and modern records of dust samples collected in East Antarctica. The results contribute to a better understanding of the dynamic of modern dust transport in the Southern Hemisphere, the provenance of dust found in Antarctica, and the provenance of eolian nutrients into the Southern Ocean.

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“…Waters here are in constant motion. Frontal currents (Paparazzo et al, 2017) in the upper waters have low salinities and low organic matter content. Deeper waters are likely very turbulent because of tidal currents (Tonini et al, 2006) that move in opposite directions.…”

Section: Nematodes and San Jorge Gulf Oceanographymentioning

confidence: 99%

“…The combination of phytoplankton blooms and tidal currents also allows high nutrient conditions to build up if water residence time in the deep basin is longer than that of the overlying shelf water (Krock et al, 2015). This area, which is isolated by a strong pycnocline during austral summer (Paparazzo et al, 2017), has the highest salinity, the most organic matter, and the highest percentage of fine sediment fraction (Fernández, 2006). These characteristics agree with our findings in the sense that the central area of the gulf (up to 75 m of depth, near the coast), where assemblage " Our results…show clear spatial distribution of nematode fauna related to benthic environmental heterogeneity in San Jorge Gulf.…”

Section: Nematodes and San Jorge Gulf Oceanographymentioning

confidence: 99%

“…Three thermal fronts have been identified in San Jorge Gulf (Glembocki et al, 2015): (1) the south front, which has high chlorophyll-a concentrations throughout the year and is strongly influenced by the cold, lowsalinity Beagle-Magellan waters that are distributed by tides and winds (Acha et al, 2004); (2) the outer front, which separates the stratified waters of the inner gulf from the vertically mixed waters overlaying the southeastern area (from spring to summer); and (3) the north front (also from spring to summer). In these three fronts, no pycnocline develops (Paparazzo et al, 2017), and phytoplankton blooms reach the benthos quickly (Fernández, 2006). Additionally, modeling results indicate upwelling driven by dominant strong westerly winds along the south and southwest coasts (Tonini et al, 2006;Glembocki et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Free-Living Marine Nematode Communities in San Jorge Gulf, Argentina

Ward¹,

Russo²,

Varisco³

2018

Oceanog

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The aim of this study was to investigate the patterns of nematode diversity and community structure in San Jorge Gulf, Argentina, in order to improve knowledge of this key group of organisms. Free-living marine nematodes were sampled at 13 stations in February 2014 during an expedition aboard R/V Coriolis II. We found a total of 188 species (101 of which were new to science) belonging to 98 genera. The statistical results indicated the presence of three different assemblages of free-living marine nematodes distributed spatially in three distinct zones in the gulf: the central part, the outer thermal front at both sides of the entrance, and the south thermal front area. Diversity increased from the coast to the entrance of the gulf, and the highest diversity was found in areas with coarser sediment. Sediment and salinity were the environmental parameters that best matched nematode community distribution.

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Linking phytoplankton nitrogen uptake, macronutrients and chlorophyll- a in SW Atlantic waters: The case of the Gulf of San Jorge, Argentina

Cited by 16 publications

References 39 publications

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

Temporal Characterization of Dust Activity in the Central Patagonia Desert (Years 1964–2017)

Free-Living Marine Nematode Communities in San Jorge Gulf, Argentina

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