Sea surface temperature anomalies on the Western South Atlantic from 1982 to 1994

Lentini, Carlos A. D.; Podestá, Guillermo; Campos, Edmo; Olson, Donald B.

doi:10.1016/s0278-4343(00)00077-7

Cited by 56 publications

(68 citation statements)

References 44 publications

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“…The ENSO negative (El Niño) and positive phases (La Niña) were related to rainfall and Sea Surface Temperature (SST) anomalies in the main oceanic currents (Brazil and Malvinas). Several studies have related, for the Buenos Aires province, the occurrence of extreme wet (dry) events with negative (positive) ENSO phases [9][10][11][12][13]. Phytoplankton blooms are the main sign of enhancement of the pelagic activity [14], and their occurrence is tightly related to biogeochemical fluctuations in sea water, and the variability in the annual recruitment of fishes (e.g., [15,16]).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

et al. 2015

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Abstract:The aim of this study is to describe and understand the seasonal and inter-annual physical and biological dynamics of the inner and mid shelves of the Southwestern Buenos Aires Province (Argentina). We used chlorophyll-a (chl-a) concentrations and inherent optical properties (IOPs), derived from ocean color products between 2002 and 2010, as a proxy for the physical and biological parameters of interest. This study focuses on the absorption by phytoplankton, aph(443), particulate backscattering, bbp(443), and absorption due to dissolved and particulate detrital matter, adg (443), and chl-a derived from a multiband quasi-analytical algorithm (QAA). A regionalization based on the coefficient of variation and the Census X-11 method were applied to define regions and to analyze the inter-annual and seasonal variability of the ocean color parameters, with regards to climate OPEN ACCESSRemote Sens. 2015, 7 11822 variability. The coastal zone presents the highest values of chl-a with two maxima in winter and autumn, while the mid-shelf shows a strong spring chl-a maximum. After 2009, all parameters under study shifted their seasonality and their magnitude changed over the entire area. In the coastal zone, mean values of aph(443) and bbp(443) increased, while in the mid-shelf, chl-a and aph(443) decreased. The observed inter-annual and seasonal behavior of the parameters is tightly related to climate variability of the study area.

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Section: Introductionmentioning

confidence: 99%

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

et al. 2015

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“…On the other hand, northwesterly offshore winds and consequent offshore transport following periods of high precipitation during El Niñ o conditions can cause upwelling of deeper waters, rich in nutrients, to the euphotic zone on the mid shelf (Ciotti et al 1995). Cold SST anomalies may be related to ENSO events (Lentini et al 2001). In particular, anomalous cold (warm) waters occur via northwardpropagating anomalies generally in every warm (cold) ENSO'1 year in the present climatology (Lentini et al 2001).…”

Section: Impacts Of Climate Variation On South American Seabirds 347mentioning

confidence: 99%

“…Cold SST anomalies may be related to ENSO events (Lentini et al 2001). In particular, anomalous cold (warm) waters occur via northwardpropagating anomalies generally in every warm (cold) ENSO'1 year in the present climatology (Lentini et al 2001). These events can radically change the local ecosystem dynamics.…”

Section: Impacts Of Climate Variation On South American Seabirds 347mentioning

confidence: 99%

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Impacts of climate variation and potential effects of climate change on South American seabirds – a review

Quillfeldt

Masello

2013

Marine Biology Research

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The coastal and oceanic waters around the South American coasts provide rich foraging grounds for breeding and wintering seabirds, but there is growing concern that climate change will provide additional pressures to the seabirds around South America. As in many other coastal ecosystems, seabirds around South America are already faced with threats to their breeding habitats such as human disturbance and introduced predators, and threats at sea such as persistent pollutants and pesticides and direct mortality risks due to fisheries and oil spills. The sensitivity of South American marine ecosystems to ocean climate anomalies is well known from the dramatic population collapses caused by El Niñ o Southern Oscillation (ENSO) events. However, longer-term climate change effects have been explored less often and few long-term data sets exist for South American seabirds. Seven Large Marine Ecosystems (LME) border South America. While all LMEs experienced warming during the last 50 years, their climate dynamics have differed in recent decades. Climate models suggest that potential climate change effects may be important, especially due to changes in ENSO intensity and frequency and associated changes in the ocean climate of Atlantic and Pacific marine ecosystems. In this review, we found that the best studied seabird communities are those of the Patagonian Shelf and the Humboldt Current, but overall, our knowledge on climate effects on South American seabirds is scarce.

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“…Several studies have also shown that subinertial currents and sea level variations can be explained in terms of continental shelf waves forced by atmospheric winds LEE, 1995;CASTRO et al, 2006;DOTTORI;CASTRO, 2009). However, there is a lack of knowledge regarding periods longer than the seasons, and few studies have dealt with this question, especially in terms of sea surface temperature variability (CAMPOS et al, 1999;LENTINI et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Low-frequency physical variations in the coastal zone of Ubatuba, northern coast of São Paulo State, Brazil

et al. 2013

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Sea level (SL), wind, air temperature (AT) and sea surface temperature (SST) variations in the coastal region of Ubatuba, northern coast of São Paulo, are assessed. A Lanczos-square cosine filter, with a 40-hour window, was applied over the SL time series between 1978 and 2000, except for the period comprising 1984 to 1986. In order to study subtidal effects on mean sea level (MSL), SL numerical filtering indicated that there was a virtually complete removal of semidiurnal and diurnal astronomical tidal components over the period of study. Results indicated an average raw SL rise of 2.3 mm/year, whereas average filtered MSL was of the order of 0.7 mm/year. Despite the overall positive MSL trend, the lunar nodal cycle of 18.6 years seemed to be the explanation for the SL series pattern. Correlations between MSL and parallel wind had a maximum correlation coefficient around 0.6, with 99% statistical confidence, while MSL and perpendicular wind correlations were not statistically significant. These results may be explained by Ekman dynamics. Data records of AT and SST between 1990 and 2003 showed positive trends for both variables. During this period, AT rose about 0.087 °C /year for the raw series and 0.085 °C /year for the monthly time series, and SST showed a rise of 0.047 °C /year and 0.046 °C/year, for the raw and monthly time series, respectively. The monthly climatology for both AT and SST showed higher values in February with 27.79 o C and 28.59 o C for AT and SST, respectively, and the lowest in July with 21.12 o C for AT and 21.91 o C for SST. RESUMOEste trabalho consiste na análise da variação do nível do mar (NM), vento, temperatura do ar (TA) e da superfície do mar (TSM) na região costeira de Ubatuba, litoral norte de São Paulo. Um filtro cosseno quadrado de Lanczos, com janela de 40 h, foi aplicado sobre uma série temporal de NM entre 1978 e 2000, com exceção dos anos 1984 a 1986. Para se estudar os efeitos submareais no nível médio do mar (NMM), os resultados da filtragem de NM indicam que houve uma remoção virtualmente completa das componentes semidiurna e diurna da maré astronômica ao longo do período estudado. Os resultados indicam uma subida do NM bruto da ordem de 2,3 mm/ano, enquanto para o NMM filtrado, obteve-se uma tendência de 0,7 mm/ano. Apesar da tendência geral positiva do NMM ao longo do período estudado, o comportamento da série de NM parece ser influenciado pelo ciclo lunar nodal de 18,6 anos. A correlação entre o NMM e o vento paralelo à costa ficou próxima de 0,6 para todos os anos analisados, com 99% de confiança estatística, enquanto as correlações entre o NMM e vento perpendicular à costa não foram estatisticamente significativas. Este comportamento é provavelmente explicado pela Dinâmica de Ekman. Os resultados de tendência para TA e TSM mostraram um aumento considerável. Para TA, o aumento linear estimado foi de 0,087°C/ano para a série bruta e 0,085°C/ano para a média mensal. Para TSM, os coeficientes lineares foram 0,047°C/ano para a série bruta e 0,046 °C/ano para a ...

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Sea surface temperature anomalies on the Western South Atlantic from 1982 to 1994

Cited by 56 publications

References 44 publications

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

Seasonal and Inter-Annual Analysis of Chlorophyll-a and Inherent Optical Properties from Satellite Observations in the Inner and Mid-Shelves of the South of Buenos Aires Province (Argentina)

Impacts of climate variation and potential effects of climate change on South American seabirds – a review

Low-frequency physical variations in the coastal zone of Ubatuba, northern coast of São Paulo State, Brazil

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