More than 20 percent of the world’s oceans have undergone significant darkening over the last two decades, reducing the depth of photic zones and threatening marine life. This phenomenon, known as ocean darkening, is caused by nutrient runoff and shifting climate patterns, leading to reduced light penetration into surface waters.
Researchers used nearly 20 years of satellite data combined with advanced computer models to study this change. They found that areas around the Arctic and Antarctic, including the Gulf Stream, have experienced the most pronounced shifts in photic zone depth due to climate change.
However, not all regions showed a decline in light availability. In some areas, such as the English Channel and regions stretching from the north of Scotland to the Orkney and Shetland Islands, the ocean has become lighter over the past two decades.
This mixed trend is attributed to various factors, including changes in nutrient levels, ocean currents, and biological productivity. While some researchers have expressed concern about the implications of this change for marine life, others suggest that it may be a natural process influenced by environmental factors rather than solely caused by climate change.
It is worth noting that not all experts agree on the cause and impact of ocean darkening. Some argue that the observed changes in ocean color and clarity are a result of increased biological productivity, which can have both positive and negative effects on marine ecosystems.
Source: https://scitechdaily.com/21-of-the-ocean-is-losing-sunlight-what-that-means-for-marine-life