Chlorophyll variability and eddies in the Brazil–Malvinas Confluence region

Garcia, Carlos Alberto Eiras; Sarma, Y.V.B.; Mata, Maurício M.; Tavano, Virgínia Maria

doi:10.1016/j.dsr2.2003.07.016

Cited by 78 publications

(77 citation statements)

References 24 publications

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“…Since the variability of Csat over the shelf and slope is strongly coupled to the annual cycle (e.g. Garcia et al, 2004;Romero et al, 2006), to understand the nature of the spatial distribution of Csat variability we removed the seasonal variability by calculating anomalies (Csata) relative to the 1998-2007 monthly means. The standard deviation of Csata is depicted in Fig.…”

Section: Surface Chlorophyll-amentioning

confidence: 99%

Malvinas-slope water intrusions on the northern Patagonia continental shelf

et al. 2010

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Abstract. The Patagonia continental shelf located off southeastern South America is bounded offshore by the Malvinas Current, which extends northward from northern Drake Passage (∼55 • S) to nearly 38 • S. The transition between relatively warm-fresh shelf waters and Subantarctic Waters from the western boundary current is characterized by a thermohaline front extending nearly 2500 km. We use satellite derived sea surface temperature, and chlorophyll-a data combined with hydrographic and surface drifter data to document the intrusions of slope waters onto the continental shelf near 41 • S. These intrusions create vertically coherent localized negative temperature and positive salinity anomalies extending onshore about 150 km from the shelf break. The region is associated with a center of action of the first mode of nonseasonal sea surface temperature variability and also relatively high chlorophyll-a variability, suggesting that the intrusions are important in promoting the local development of phytoplankton. The generation of slope water penetrations at this location may be triggered by the inshore excursion of the 100 m isobath, which appears to steer the Malvinas Current waters over the outer shelf.

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Section: Surface Chlorophyll-amentioning

confidence: 99%

Malvinas-slope water intrusions on the northern Patagonia continental shelf

et al. 2010

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“…Remote sensing techniques have been increasingly used for environmental research in South America. However, most studies focused on the temporal variability of chlorophyll-a, with low spatial resolution, in the Patagonian shelf [33][34][35], as well as in the continental shelf region [36][37][38]. Other studies compared in situ and satellite estimates of chlorophyll-a obtaining reasonable results [39][40][41][42].…”

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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“…One example is the Brazil-Malvinas Confluence (BMC) region in the extra-tropical (Southwestern) Atlantic Ocean. Although the nature of the thermal, sea height and chlorophyll gradients between the (warm, high, oligotrophic) Brazil Current (BC) and the (cold, low, eutrophic) Malvinas Current (MC) at the BMC have been object of study of many authors in the last decades [e.g., Legeckis and Gordon, 1982;Chelton et al, 1990;Garcia et al, 2004], they are often only investigated from the oceanographic viewpoint. However, the spatial/ temporal variability of the BMC region is also expected to impact the MABL (in a similar manner to OA interactions in other regions of the World Ocean).…”

Section: Introductionmentioning

confidence: 99%

Ocean‐atmosphere in situ observations at the Brazil‐Malvinas Confluence region

Pezzi

Souza

Dourado

et al. 2005

Geophysical Research Letters

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[1] This paper presents a description of marine atmospheric boundary layer (MABL) and oceanic boundary layer (OBL) interactions at the Brazil-Malvinas Confluence. Although this region is known as one of the most energetic zones of the World Ocean, very few studies have addressed the mechanisms of OA interaction there. Based upon novel, direct in situ simultaneous OA observations, our results show that the OBL-MABL exchanges are closely correlated with the sea surface temperature (SST) field. The heat fluxes range from 110 W.m À2 over warm waters down to 18 W.m À2 over cold waters. Higher heat fluxes and air-sea temperature differences are associated with stronger near-surface winds. This suggests that the MABL is modulated at the synoptic temporal and spatial scale by the strong surface thermal gradients between the (warm) Brazil and the (cold) Malvinas (Falklands) currents. Citation:

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Chlorophyll variability and eddies in the Brazil–Malvinas Confluence region

Cited by 78 publications

References 24 publications

Malvinas-slope water intrusions on the northern Patagonia continental shelf

Malvinas-slope water intrusions on the northern Patagonia continental shelf

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)

Ocean‐atmosphere in situ observations at the Brazil‐Malvinas Confluence region

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