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Estimación de concentración de clorofila-a en el lago Titicaca usando imágenes satelitales MERSI

Authors: Paulino Rojas, Carlos; Xu, Han; Alburqueque, Edward; Velaochaga, Germán;

Estimación de concentración de clorofila-a en el lago Titicaca usando imágenes satelitales MERSI

Abstract

Imágenes satelitales del sensor MERSI de 250 m de resolución espacial fueron usadas para la estimación de la concentración de clorofila-a del Lago Titicaca y su relación con los productos calibrados de concentración de clorofila-a del MODIS (AQUA) y VIIRS (NPP), los cuales son recepcionados y procesados por el sistema TERASCAN del IMARPE. Para la estimación de concentración de clorofila-a se usó 3 modelos de razón de bandas (MOD2-1, MOD2-2 y MOD2- 3) a partir de valores de reflectancia de las imágenes MERSI. El análisis de distribución de clorofila-a en los perfiles P1 y P2 indicó que el modelo MOD2-2 es el que se aproxima más a los valores calculados por VIIRS y MODIS. Los resultados evidenciaron una correlación de R=0,846 entre los valores de clorofila-a del MOD2-2 y VIIRS en el perfil P1, una correlación menor en el perfil P2 de R=0,472 y una óptima correlación para valores de clorofila-a en un rango entre 0 a 2 mg/m3 de R=0945. Se evidenció la importancia de la resolución espacial de 250 m del modelo MOD2-2 en la estimación de la clorofila en el Lago Titicaca, porque permite identificar características que no pueden ser registradas con los sensores MODIS. Tanto para áreas abiertas como para zonas con abundante vegetación, los productos del MODIS y VIIRS de 1 km se saturan fácilmente, como en el caso de la bahía de Puno.

ABSTRACT: Satellite images of the sensor MERSI of 250 m of spatial resolution were used for the estimation of the concentration of chlorophyll-a of Lake Titicaca and its relationship with the calibrated products concentration of chlorophyll-a from MODIS (AQUA) and VIIRS (NPP), which are received and processed by the TERASCAN system of the IMARPE. For the estimation of concentration of chlorophyll-a, we used 3 models of reason of bands (MOD2-1, MOD2-2 and MOD2-3) from reflectance values of the images MERSI. The analysis of distribution of chlorophyll-a in the profiles P1 and P2 indicated that the model MOD2-2 is the one that is closest to the calculated values by VIIRS and MODIS. The results showed a correlation of R=0.846 between the values of chlorophyll-a MOD2-2 and VIIRS in profile P1, a correlation lower in the profile P2 of R=0,472 and an optimal correlation for values of chlorophyll-a in a range between 0 to 2 mg/m3 of R=0945. It was proved the importance of the spatial resolution of 250 m the model MOD2-2 in the estimation of chlorophyll in the Lake Titicaca, because it allows you to identify features that may not be registered with the MODIS sensors. Both for open areas such as for areas with abundant vegetation, in which products from MODIS and VIIRS of 1 km are saturated easily, as in the case of the Bay of Puno.

Informe IMARPE 43(3), 2016 p. 242-251

Country
Peru
Keywords

Clorofila, Lago Titicaca, Puno, Imágenes Satelitales

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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