It can’t just be *all* polution can it? I know in the last 13odd years of a tory government the water companies have been allowed to get away with constant sewage dumping (far over their allowed limits, feel free to look up any report or documentary on this) I’ve seen multiple “blue flag” beaches now have their water quality drastically lowered.
So excluding this why is it *always* brown/looks horrid? Its never a beautiful blue! Theres multiple beaches up/around Scotland that seem to have beautiful blue waters but of course its just freezing up there!
In: Biology
It’s mostly nutrients and sediments and plankton. Ocean water in the tropics mixes less, as the temperature in the top layer is higher. So sediment and matter that falls to the bottom tends to stay there.
The brown and green water in the northern latitudes is actually richer in nutrients and micro-organisms, because the mixing of top and bottom layers makes nutrients more available to a more diverse set of organisms.
Additional to other comments, both the locations you mentioned are at the mouth of a river, so the local water is full of river sediments picked up by the river
The bottom of the sea is full of mud.
Other places either have different soils washing into the sea, different organisms out there anchoring/eating the soil or the thing about layers of water interacting the other comment mentioned.
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