Yearly Chlorophyll a anomaly with extreme frequency (%)

The Chlorophyll a daily anomaly occurrences at a given pixel and the total number of days that valid data was collected. the relative frequency will be calculated as follows: Relative Frequency of Pixel Chlorophyll a Anomalies = the number of days with a moderate (in the 90th percentile), high (in the 95th percentile) or extreme (in the 99th percentiles) anomaly divided by the number of days valid observations