Fig. 3 | Scientific Reports

Fig. 3

From: Long-term water types and satellite chlorophyll a variability in a river discharge environment around Ieodo Ocean Research Station

Fig. 3

(a) Monthly distribution of optimally interpolated MODIS Chl-a concentrations over two decades (2003–2022); the asterisk indicates the location of I-ORS. (b) Coherence wavelet transform (CWT) scalogram between the Chl-a time series at I-ORS and river discharge, where the dashed line denotes the 95% confidence level based on a chi-square distribution with 2 degrees of freedom. Regions outside this cone are not statistically significant and were thus excluded from the interpretation.

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