Changing colours in San Francisco Bay salt ponds, USA

Sentinel-2 MSI acquired on 19 February 2019 at 18:54:21 UTC
Sentinel-2 MSI acquired on 17 October 2019 at 18:54:01 UTC
Sentinel-2 MSI acquired on 24 February 2020 at 18:53:51 UTC
Sentinel-2 MSI acquired on 03 June 2020 at 18:49:21 UTC
Sentinel-2 MSI acquired on 21 October 2020 at 18:54:31 UTC
Author(s): Sentinel Vision team, VisioTerra, France -
Keyword(s): Coastal, bay, march, California, United States, USA
Fig. 1 - S2 (19.02.2019) - The San Francisco Bay Salt Ponds are an approximately 6700 ha at the S-E part of the San Francisco Bay.
Fig. 2 - S2 (17.10.2019) - They have been used as salt evaporation ponds since the California Gold Rush era.
Fig. 3 - S2 (24.02.2020) - Most of the ponds were once wetlands in the cities of Redwood City, Newark, Hayward and other parts of the bay.
Fig. 4 - S2 (03.06.2020) - The ponds are noted for their vivid colors, ranging from magenta to blue-green, that are especially visible from the air.
Fig. 5 - S2 (21.10.2020) - The colors come from the brine shrimp and microorganisms that thrive in the different salinity levels in the ponds.