Assess chlorophyll-a levels along the peruvian coast during the summer of 2018: a comparative study between Modis-Aqua satellite data and in situ measurements
DOI:
https://doi.org/10.53554/boletin.v39i1.406Keywords:
Chlorophyll-a, MODIS-Aqua, Comparative analysis, SeaDAS, PeruAbstract
In this study, we investigated surface chlorophyll-a levels using in situ fluorometric techniques and the OC3M model applied
to MODIS Level 0 imagery from the Aqua satellite with a spatial resolution of 250 m, using SeaDAS 7.4 software. The analysis
was conducted during the 2018-0204 research cruise along the Peruvian coast. Comparing the chlorophyll-a measurements
at 72 stations during the cruise revealed a moderate correlation (R2 = 0.66). The Northern and Southern sub-areas showed
higher correlations (R2 = 0.77 and 0.76, respectively), while the Central area exhibited a lower correlation (R2 = 0.42) due to temporal variability and cloud cover. The RMSE of the MODIS data was 35%, indicating good reliability, although the BIAS values indicate a slight underestimation in the Northern and Central sub-areas and an overestimation in the Southern area.
Our scatter plot analysis demonstrated increased dispersion between measurements as pigment concentration rose. Overall, the criteria used in this study for water type classification were validated through statistical analysis.
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