Time series change of chlorophyll-a concentration in Tokyo Bay (Weekly)

The top right figure shows the average histogram of the red square field in the top left figure. The bottom figure shows its time-series change. Blue, green, yellow, and red lines show the values of 2018, 2019, 2020, and 2021 respectively. In the bottom figure, blue, green, and red circles show the values of each day. The solid lines show weekly average values and the dotted line shows the values of the moving average of +/- 10 days from 2018 to 2019.