Hydrographic data from the GEF Patagonia cruises

Charo, Marcela; Piola, Alberto R.

doi:10.5194/essd-6-265-2014

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…The former is coincident with the beginning of the record at site A (Figure ). A detailed description of these observations is provided in Charo and Piola []. The hydrographic data are available at http://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0110317.…”

Section: Methodsmentioning

confidence: 99%

Evidence of upwelling events at the northern Patagonian shelf break

Valla

Piola

2015

JGR Oceans

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The Patagonian shelf break marks a transition between relative warm‐fresh shelf waters and relative cold‐salty Subantarctic Water advected northward by the Malvinas Current. From early spring to late autumn, the outer shelf region is characterized by a band of high chlorophyll concentration that sustains higher trophic levels, including significant fisheries. We analyze time series of current and water mass property observations collected at two moorings deployed at the shelf edge at 41°S and 43.8°S to investigate what mechanisms lead to temperature variability at the shelf break, and their role on the nutrient supply to the upper layer. The in situ data are combined with satellite‐derived observations of sea surface temperature and chlorophyll a to analyze a sharp cooling event at the outer shelf that lasted 10 days and extended ∼500 km along the outer shelf. The event is consistent with upwelling of cold waters through the base of the mixed layer. The vertical velocity required to explain the observed cooling is 13–29 m d−1. Satellite‐derived sea surface temperature reveals additional cooling events of similar characteristics. Seventy‐five percent of these events are concurrent with surface chlorophyll increase over a 5 day period suggesting that cooling events observed at the shelf break are associated with nutrient fluxes that promote the growth of phytoplankton.

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Section: Methodsmentioning

confidence: 99%

Evidence of upwelling events at the northern Patagonian shelf break

Valla

Piola

2015

JGR Oceans

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“…The spin-up spans 15 years: 10 years for the parent model and 5 additional years for the parent-child configuration, followed by a 34year integration . This model configuration has previously been described by Combes and Matano (2014a) and widely used for studies on the Patagonian Shelf (e.g., Matano, 2014b, 2018). CMM is forced at the surface by monthly ERA-Interim winds (Dee et al, 2011) and heat and freshwater fluxes from the Comprehensive Ocean-Atmosphere Data Set (COADS) (Da Silva and Young, 1994), with a tendency-restoring term to the Pathfinder SST climatology.…”

Section: Datamentioning

confidence: 99%

“…At the southern tip of South America, the westerlies are strong, and schematic reconstructions of the annual mean ocean circulation in this area, based on hydrographic observations and models, show that the main flow patterns are from the Pacific towards the Atlantic (Combes and Matano, 2014a). The Antarctic Circumpolar Current (ACC) flows eastwards carrying cold and fresh (34 PSU) Subantarctic waters (Piola and Gordon, 1989;Peterson and Whitworth III, 1989) that are rich in nutrients (Acha et al, 2004;Romero et al, 2006) from the Drake Passage along the upper portions of the western slope of the Argentine basin.…”

Section: Introductionmentioning

confidence: 99%

Dynamical connections between large marine ecosystems of austral South America based on numerical simulations

et al. 2020

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Abstract. The Humboldt Large Marine Ecosystem (HLME) and Patagonian Large Marine Ecosystem (PLME) are the two largest marine ecosystems in the Southern Hemisphere and are respectively located along the Pacific and Atlantic coasts of southern South America. This work investigates the exchange between these two LMEs and its seasonal and interannual variability by employing numerical model results and offline particle-tracking algorithms. Our analysis suggests a general poleward transport on the southern region of the HLME, a well-defined flux from the Pacific to the Atlantic, and equatorward transport on the PLME. Lagrangian simulations show that the majority of the southern PS waters originate from the upper layer in the southeast South Pacific (<200 m), mainly from the southern Chile and Cape Horn shelves. The exchange takes place through the Le Maire Strait, Magellan Strait, and the shelf break. These inflows amount to a net northeastward transport of 0.88 Sv at 51∘ S in the southern PLME. The transport across the Magellan Strait is small (0.1 Sv), but due to its relatively low salinity it greatly impacts the density and surface circulation of the coastal waters of the southern PLME. The water masses flowing into the Malvinas Embayment eventually reach the PLME through the Malvinas Shelf and occupy the outer part of the shelf. The seasonal and interannual variability of the transport are also addressed. On the southern PLME, the interannual variability of the shelf exchange is partly explained by the large-scale wind variability, which in turn is partly associated with the Southern Annular Mode (SAM) index (r=0.52).

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“…Profiles gathered in 2006 were collected within the framework of the Coastal Contamination, Prevention and Marine Management project, which was part of the scientific agenda of the United Nations Development Program. Cruises were carried out on board the ''Oca Balda'' and ' 'Puerto Deseado'' oceanographic vessels, in March of 1994, 1996 In each cruise, hydrographic stations were carried out along crossshelf sections spanning the shelf from near-shore to the western boundary currents, between 38°and 55°S (Charo and Piola, 2014). For the purposes of this work, it has been used data collected at the following locations and dates (See Fig.…”

Section: Datamentioning

confidence: 99%

“…Concerning wind speed and direction, the four daily values provided by NR1 were used to compute a weighted average, such that the wind stress computed from this average is equal to the average of the stresses computed from the four daily values of the wind speed and direction. The initial winter water temperature was set equal to 6.8°C, according to data collected by ''Puerto Deseado'' vessel on September 9th, 2006, at location S4 (Charo and Piola, 2014).…”

Section: S2p3 Numerical Modelmentioning

confidence: 99%