Atmospheric Correction of Satellite Optical Imagery over the Río de la Plata Highly Turbid Waters Using a SWIR-Based Principal Component Decomposition Technique

2021 ◽  
Vol 13 (6) ◽  
pp. 1050
Author(s):  
Juan Ignacio Gossn ◽  
Robert Frouin ◽  
Ana Inés Dogliotti
Keyword(s):  
Principal Components ◽  
Near Infrared ◽  
Atmospheric Correction ◽  
Low Noise ◽  
Optical Data ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Turbid Waters ◽  
The Impact

Estimating water reflectance accurately from satellite optical data requires implementing an accurate atmospheric correction (AC) scheme, a particularly challenging task over optically complex water bodies, where the signal that comes from the water prevents using the near-infrared (NIR) bands to separate the perturbing atmospheric signal. In the present work, we propose a new AC scheme specially designed for the Río de la Plata—a funnel-shaped estuary in the Argentine–Uruguayan border—highly scattering turbid waters. This new AC scheme uses far shortwave infrared (SWIR) bands but unlike previous algorithms relates the atmospheric signal in the SWIR to the signal in the near-infrared (NIR) and visible (VIS) bands based on the decomposition into principal components of the atmospheric signal. We describe the theoretical basis of the algorithm, analyze the spectral features of the simulated principal components, theoretically address the impact of noise on the results, and perform match-ups exercises using in situ measurements and Moderate Resolution Imaging Spectrometer (MODIS) and Visible Infrared Imaging Radiometer Suite (VIIRS) imagery over the region. Plausible water reflectance retrievals were obtained in the NIR and VIS bands from both simulations and match-ups using field data—with better performance (i.e., lowest errors and offsets, and slopes closest to 1) compared to existing AC schemes implemented in the NASA Data Analysis Software (SeaDAS). Moreover, retrievals over images in the VIS and NIR bands showed low noise, and the correlation was low between aerosol and water reflectance spatial fields.

The impact of Río de la Plata plume favors the small-sized copepods during summer

2020 ◽  
Vol 245 ◽  
pp. 107000
Author(s):  
G.D. Cepeda ◽  
M.D. Viñas ◽  
G.N. Molinari ◽  
M.C. Hozbor ◽  
R.I. Silva ◽  
...  
Keyword(s):  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
The Impact

scholarly journals EL MUNDO EN UNA NUEZ: DE CALCUTA Y CANTÓN A BUENOS AIRES EN UNA ÉPOCA DE GUERRA. LA INTRODUCCIÓN DE EFECTOS ASIÁTICOS EN LOS MERCADOS SURAMERICANOS, 1805–1807

2019 ◽  
pp. 1-34
Author(s):  
Antonio Ibarra
Keyword(s):  
Buenos Aires ◽  
Global Market ◽  
Rio De La Plata ◽  
Andean Region ◽  
Río De La Plata ◽  
La Plata ◽  
The Impact

ABSTRACTThis article explores the impact of Asian goods in the Rio de la Plata area through the navigation course of two frigates of the Royal Company of Phillipines, forced by the maritime conflict between the Spanish and British Empires, dock in the Southern estuary. Examining the value and traits of the shipment and the details of the ‘comercio de pacotilla’, this study analyzes the distribution of the goods from China, Philippines and in particular, India, in the port basin, the hinterland of the Viceroyalty, and its connections to the Alto Peruvian space, the trans-Andean region, and the Littoral way to Paraguay. This episode enables an understanding of the distribution of goods, as well as a more detailed recognition of the actors of this traffic and a renewed evaluation of the role of the company in the global market of Asian goods.

“Del florido caudal que estaba en caxa”: La administración de los capitales del ramo de temporalidades jesuitas en Buenos Aires, 1767-1803

2017 ◽  
pp. 19
Author(s):  
María Valeria Ciliberto
Keyword(s):  
Case Studies ◽  
Regional Economy ◽  
Buenos Aires ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
Economic Changes ◽  
Social Actors ◽  
La Plata ◽  
Micro Level ◽  
The Impact

La administración de las temporalidades jesuitas rioplatenses ha sido abordada por la historiografía a partir del análisis de estudios de caso que han precisado la naturaleza de los cambios económicos generados por el extrañamiento en los espacios ocupados por la Compañía. Estas investigaciones interpretaron la actuación de los funcionarios desde el prisma de la corrupción colonial, señalando fraudes y malversaciones pero sin detenerse en analizar los mecanismos que a nivel micro se implementaron para beneficiar a los intereses vernáculos. Nuestra investigación estudia una de estas dinámicas focalizando el análisis en los censos otorgados por las temporalidades porteñas. Puntualmente, reconstruimos las transacciones crediticias autorizadas por las Juntas de Buenos Aires, identificando actores sociales intervinientes, montos de los capitales otorgados, plazos de pago y réditos estipulados a fin de evaluar desde esta perspectiva el impacto del reformismo en el desarrollo de la economía regional.Palabras clave: Río de la Plata, temporalidades, censos, deudas.“Of the flowery flow that was in caxa”:The Administration of the Capitals of the Branch of JesuitTemporalities in Buenos Aires, 1767-1803AbstractThe administration of the Jesuits Temporalities of Río de la Plata has been approached by historiography from the analysis of case studies that have specified the nature of the economic changes generated by the estrangement in the spaces occupied by the Company. These investigations interpreted the actions of the officials from the perspective of colonial corruption, pointing out frauds and embezzlements but without analyzing the mechanisms that were implemented at the micro level to benefit the vernacular interests. Our research studies one of these dynamics focusing the analysis in the censuses granted by the Temporalities of Buenos Aires. Punctually, we reconstruct the credit transactions authorized by the Boards of Buenos Aires, identifying social actors involved, amounts of capitals granted, payment terms and stipulated revenues in order to evaluate the impact of reformism on the development of the regional economy from this perspective.Keywords: Río de la Plata, temporalities, censuses, debts“O florido caudal que estava em caixa”: A administração dos capitais da classe de temporalidades jesuítas em Buenos Aires, 1767-1803.ResumoA administração das Temporalidades jesuítas rio-platenses foi abordada pela historiografia a partir da análise de estudos de caso que esclareceram a natureza das mudanças económicas causadas pelos desterros nos espaços ocupados pela Companhia. Estas investigações interpretaram a ação dos funcionários desde o prisma da corrupção colonial, sinalando fraudes e malversações, mas sem se deter para analisar os mecanismos realizados no nível micro, para beneficiar os interesses vernáculos. Nossa pesquisa estuda uma destas dinâmicas focando a análise nos censos outorgados pelas Temporalidades Portenhas. Especificamente, reconstruímos as operações de crédito autorizadas pelos Conselhos de Buenos Aires identificando atores sociais envolvidas, monto do capital concedido, prazos de pagamento e as utilidades estipuladas para avaliar dessa perspectiva o impacto do reformismo no desenvolvimento da economia regional.Palavras-chave: Rio da Prata, temporalidades, censos, dívidas

scholarly journals Evaluating the performance of the OC5 algorithm of IFREMER for the highly turbid waters of Río de la Plata

2016 ◽  
Vol 64 (1) ◽  
pp. 19-28 ◽  
Author(s):  
Martina Daniela Camiolo ◽  
Ezequiel Cozzolino ◽  
Claudia Gloria Simionato ◽  
María Constanza Hozbor ◽  
Carlos Ángel Lasta
Keyword(s):  
Poor Performance ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
Turbid Waters ◽  
Global Vision ◽  
Point Correlation ◽  
Point To Point

Abstract Remote sensing provides a global vision of the oceans; validation is, however, an essential previous step. IFREMER developed the empirical algorithm OC5 for highly turbid (or type 2) waters and it performed well for the northwestern European shelf. The aim of this study was to evaluate the performance of this algorithm for the Río de la Plata estuary, utilizing in situ observations of chlorophyll-a and suspended matter. Our results show a low point-to-point correlation between in situ and remote observations for both variables. In addition, the root mean square log error (RMSE) exceeded 35% for both variables, indicating a poor performance of the OC5 algorithm. This might be related to the empirical nature of the algorithm, to the amount and distribution of the data used for the analysis, to the species that compose the phytoplankton of the region, to the presence of other optically active substances in the water, and to errors in the atmospheric corrections and/or to the spatial variability of the analyzed variables. In conclusion, our results confirm the need to develop regional algorithms which take into account the particular physical and biological characteristics of the area under study.

scholarly journals Model Sensitivity during Extreme Positive and Negative Surges in the Río de la Plata Estuary: Highlighting the Need for an Appropriate Hindcast/Forecast System

2020 ◽  
Vol 35 (3) ◽  
pp. 1097-1112 ◽  
Author(s):  
Matías G. Dinápoli ◽  
Claudia G. Simionato ◽  
Diego Moreira
Keyword(s):  
Water Level ◽  
Surface Pressure ◽  
Numerical Solutions ◽  
Storm Surges ◽  
Water Levels ◽  
Wind Forcing ◽  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
The Impact

Abstract The large and fast-flowing Río de la Plata (RdP) estuary is affected by extreme storm surges (above ±2 m with respect to tidal datum), which have large impacts on the millions of inhabitants and for navigation. In this work the Coastal and Regional Ocean Community Model (CROCO) numerical model was modified and implemented as a set of regional one-way nested 2D applications for the hindcast/forecast of water level in the RdP. A sensitivity analysis (SA) was carried out to determine the impact on the numerical solutions of the uncertainties in the different modeling parameter forcings and to highlight the need for the construction of a modeling system that provides meaningful information to the potential users. The SA included the friction coefficients, the wind speed and direction, the atmospheric surface pressure, and the continental discharge. Water level is most sensitive to uncertainties in the wind forcing; even small changes in this input can create large errors in the water level forecast/hindcast. Forcing with different analyses’ wind products yielded differences of up to 50% in the peak water levels. Results also showed that the modeling system requires a reasonable adjustment of the bottom friction parameters; that it is important to include the atmospheric surface pressure forcing; and that, from the point of view of water level forecast, it is not necessary to couple a hydrological model in spite of the enormous runoff of this estuary. Given the strong sensitivity to errors in the wind forcing, we believe it is important to provide estimates of uncertainty together with hindcast/forecast water level for these predictions to be of greatest quality and practical applicability.

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