Much like raging wildfires, scorching heat waves and drenching floods, the ocean’s changing color is yet another warning sign of human-driven climate change, according to a new study that analyzed two decades’ worth of specialized satellite observations.
But even though seawater has always differed depending on location, season or currents, scientists say the color of more than half of the world’s oceans is changing — and fast., the ocean’s changing color is yet another warning sign of human-driven climate change, according to a new study that analyzed two decades’ worth of specialized satellite observations.
last week in Nature. “Changes in such a short amount of time are not good because they put the whole ecosystem out of balance.”— and the effects they could have on marine life — in 2019. And even then, she said satellites would “be the sentinels” in determining whether the ocean’s color was shifting.
In the ocean, water can have a brownish tint if it’s loaded with dead leaves and sediments spewing from rivers, she said. In other places, the ocean can showcase a range from deep navy blue to a greener-looking shade — and that’s where phytoplankton come into play. In some places, rising temperatures are changing ocean currents, disrupting the flow of deep-sea nutrients that surface-dwelling phytoplankton need to survive. That lack of nutrition can decrease phytoplankton populations — turning the water bluer. In other areas, Dutkiewicz said the water has taken on a greener tint as phytoplankton populations increase — a boom that can be “too much” for the ecosystem to sustain.
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