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Thread: color of water during different seasons /does color exist without light?

  1. #1 color of water during different seasons /does color exist without light? 
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    Myself and a few co workers have an ongoing discussion/disagreement about water color.Each day we drive across the Susquehanna river and I notice the river looks different colors different times of the year.Not just the suspended material in the water but the color.For example in the summer months the water has a gray color when you would think it would be more green due to algae growth,however in the winter months it has a bright green look almost emerald.Can the fact that the sun is at a more severe angle in the winter causing it to look more green due to less light penetration? My friends say no but I have watched this for 30 years and it does look more green in winter.Please give me any insight on this topic.Thanks.


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  3. #2  
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    can't answer the first part of your thread title, but will have a go at the second.

    colour of an object is intrinsic to that object and orange is still orange even when it is in the dark.

    or

    colour is just a product of our brain. light has no colour. 700nm light is not red. we perceive it as red purely because of the way our eyes and brain work.


    or


    an object has no colour if no light is reflected from it surface.


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    Sometimes it is better not knowing than having an answer that may be wrong.
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  4. #3 River water 
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    Thanks, for that insight but I am still searching for an answer or someone who looks at a body of water from above and can clearly see drastic different colors during winter and summer months.I think I will start photographing now and throughout the next year from the same spot so I can better see.Maybe its just me ,my perception of what it should be .Don't think so.I live in Perryville Maryland US.Also I don't mean algae bloom or muddy water just brighter greener emerald during winter only.
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  5. #4  
    Forum Radioactive Isotope cosmictraveler's Avatar
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    The sunlight reflects off the water differently at certain times of the year so that could be one reason that this happens. Another reason is that hotter water causes the living organisms to become more active and abundant so that too could cause the changes. Then there's pollution that could be being dumped into the water, certain times of the year more types of pollution are added to waterways due to run off, fertilizer use and sewage contamination.
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  6. #5  
    Forum Bachelors Degree Kerling's Avatar
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    The cause of the colour of the water, is due to the organisms that live in it. They have different colours in different seasons. Just like trees for instance.
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