Wind wave climate change: Impacts on the littoral processes at the Northern Buenos Aires Province Coast, Argentina

Dragani, Walter C.; Martin, P.; Alonso, Guadalupe; Codignotto, Jorge Osvaldo; Prario, Bárbara; Bacino, Guido

doi:10.1007/s10584-013-0928-8

Cited by 22 publications

(17 citation statements)

References 19 publications

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“…Changes in wind due to global warming may have large geophysical and societal impacts (McInnes et al, 2011). Over the oceans, for instance, changes in wind speed play an important role in storm surge and wind wave climates (see, for example, D' Onofrio et al, 2008;Dragani et al, 2010Dragani et al, , 2013Young et al, 2011Young et al, , 2012Codignotto et al, 2012). In addition, wind speed changes play a fundamental role in the spatial patterns of sea surface temperature warming, the global hydrological cycle (through evaporation) and in the regional distribution of sea level rise, among other processes.…”

Section: Introductionmentioning

confidence: 99%

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

2015

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Surface scalar wind speed trends (from 1979 to 2009) at the southwestern Atlantic Ocean, between 33° and 50°S and 55° and 70°W, were estimated from the NCEP/NCAR I (NR1) and the Climate Forecast System Reanalysis (CFSR) using Sen's slope. Trends were tested using the seasonal Mann–Kendall test. Scalar wind speed trends computed from NR1 database were positive throughout the whole study area, with values ranging from +0.01 to +0.03 m s−1 year−1. On the contrary, wind speed trends computed from CFSR database were rather different to trends obtained from NR1 reanalysis. Wind speed and sea surface temperature (SST) trend patterns, both computed from CFSR database, seem to be quite consistent but, in general, no apparent relationship between both patterns was obtained when different global databases were analysed. Sea surface wind speed data compiled from multiple satellite observations were also used to compute wind speed trends. Computed satellite trends resulted in very good agreement with positive values obtained from NR1 database. NR1 data series presented significant inter‐annual to multi‐decadal oscillations at the Argentinean continental shelf, but they would not seem to be associated either with the Southern Annular Mode or with El Niño Southern Oscillation. Possible impacts of positive speed wind trends on the mean depth of the ocean mixed layer and on the wind wave climate are briefly discussed.

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Section: Introductionmentioning

confidence: 99%

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

2015

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“…Different changes in atmospheric processes have been previously reported for the southwestern Atlantic Ocean (Gregg & Conkright, 2002;Severov et al, 2004;Simionato et al, 2005;Dragani et al, 2013;Pescio et al, 2015), and in particular for the Argentine platform (Martos & Piccolo, 1988;Lucas et al, 2005;Auad & Martos, 2012;Delgado et al, 2012). The passage of cyclones produced from baroclinic and lee topographic instability of the westerlies seemed to cause the high temporal variability of the winds over the southeastern South Atlantic (Gan & Rao, 1991).…”

Section: Discussion 41 Shifts In Wind and Temperature Patterns Alongmentioning

confidence: 74%

Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach

et al. 2017

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Monte Hermoso (SW Atlantic, Argentina) is a coastal ecosystem highly modulated by wind forcing. Offshore winds have historically played a leading role in the tourist influx as they are associated with the occurrence of the endemic stinging medusa Olindias sambaquiensis. This species is closely related to warm summers but it could be favored by low temperatures in previous winters. Since summer 2013, a change in the wind pattern was locally perceived coincidently with the absence of the medusa in coastal waters. This work aimed at analyzing if wind pattern and sea surface temperature (SST) showed a measurable change along 2008-2015 and evaluating if this change can be associated to the observed variations in the occurrence pattern of O. sambaquiensis. Winds and SST data were analyzed in periods of high (2008-2012) and low (2013-2015) medusae occurrence, based on media and own observations. A significant change in the wind pattern in Monte Hermoso was detected. Wind speed decreased from 6.3 m s -1 in 2008 to 2.4 m s -1 in 2015 and calms and light winds increased by more than 44.2 and 7.5 %, respectively. This change implied an impediment of coastal upwelling, which is the physical process by which medusae reach the coast, and is associated with persistent (10 h or more) WNW to ENE winds blowing at ≥ 3.3 m s -1 . Accordingly, in summer 2008 (period of high medusae occurrence), 45 coastal upwelling-days were detected in contrast to only 8 days in summer 2015 (period of absence of medusae). Also, positive SST anomalies were found over the 8-yr period, suggesting an increasing trend of 0.4 °C. Higher temperatures than normal during recent winters probably affect negatively the polyp reproduction. Our results demonstrate an environmental change in the ecosystem of Monte Hermoso and may explain, in part, the low occurrence of O. sambaquiensis in recent summers. The knowledge of the factors that regulate the occurrence of O. sambaquiensis is fundamental for developing a coastal management plan and/or for determining the first adaptation strategies. Keywords: offshore winds; Sea Surface Temperature (SST) anomalies; coastal ecosystem; Olindias sambaquiensis; Southwestern Atlantic Ocean ResumoMonte Hermoso (SW Atlantic, Argentina) é um ecossistema costeiro altamente modulado pelo forçamento do vento. Os ventos marais têm historicamente desempenhado um papel de liderança no influxo turístico, uma vez que estão associados à ocorrência da medusa endêmica Olindias sambaquiensis. Esta espécie está intimamente relacionada aos verões quentes, mas pode ser favorecida por baixas temperaturas em invernos anteriores. Desde o verão de 2013, uma mudança no padrão de vento foi percebida localmente coincidentemente com a ausência da medusa nas águas costeiras. Este trabalho teve como objetivo analisar se o padrão de vento e a temperatura da superfície do mar (SST) mostraram uma alteração mensurável ao longo de 2008-2015 e avaliando se essa alteração pode ser associada às variações observadas no padrão de ocorrência de O. sambaqui...

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“…The main resource of these barriers of Buenos Aires is the availability of groundwater to feed touristic villages and to permit their forestation with ornamental trees (Bértola et al 2002, Turno Orellano andIsla 2004). In the last years (1964 to 2009) the Punta Rasa complex spit would have been retreating about 560 m (Dragani et al 2013). Mar Chiquita barrier grew from north to south, from a former cape constructed by sandy silts in Villa Gesell (Violante 1993).…”

Section: Barriers Of Buenos Airesmentioning

confidence: 99%

Coastal barriers from Argentina: Buenos Aires, Patagonia and Tierra del Fuego

Isla¹

2017

ABEQUA

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Barriers, barrier islands and spits characterise low-lying coasts. However, they can grow along erosive coasts where there is a constant supply of sand, gravel, or both. At the Argentine coast, sandy barriers characterise the template coast of Buenos Aires. The availability of gravel at the Patagonian and Tierra del Fuego coasts induces the formation beach-ridge plains that can derived into coarse-grained spits. The morphology of these spits obeys to the basin depth and the availability of sediment. Recurved spits signify that the beach drift is locally modified by the action of waves or sediment-supply shortages. Some spits are today subject to local erosion (cannibalisation) that compensates these sediment deficits. Barriers and spits are ideal to locate harbours, marinas or touristic (resort) villages. However, the freshwater volumes inside their bodies are limited, even in areas where rain-fed aquifers have plenty of capacity. In this sense, resort villages are limited in their urban sprawl and planners should foresee these resource-based limitations.

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Wind wave climate change: Impacts on the littoral processes at the Northern Buenos Aires Province Coast, Argentina

Cited by 22 publications

References 19 publications

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

Wind speed trends over the southwestern Atlantic Ocean, between 33° and 50°S

Wind Pattern Change Along a Period of Coastal Occurrence Variation of a Stinging Medusa on a SW Atlantic Beach

Coastal barriers from Argentina: Buenos Aires, Patagonia and Tierra del Fuego

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