Tonga Eruption creating blood red sea

[link to www.wired.com]

One of the more striking descriptions of the eruption is the supposed “blood red seas”. Now, it isn’t the volcano that is directly causing the ‘blood red’ water, but rather an algal bloom related to addition of heat and nutrients (like iron) to the water from the prolonged eruption. Such blooms were noted after the eruption at Kasatochi in the Aleutians when ash added significant iron to the surface seas.