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Alaska's beautiful pristine arctic rivers, once a testament to untouched natural beauty, are now undergoing a startling and troubling transformation. Approximately 75 of the waterways have turned into bright, rusty, orange rivers and streams. 

The Brooks Range, a 700-mile mountain range stretching from northern Alaska into Canada's Yukon Territory, has been especially hard hit by this phenomenon. 

The cause of this dramatic color shift is currently under investigation by researchers and environmentalists.  Preliminary findings suggest a direct correlation with climate change, specifically the thawing permafrost. 

As the frozen ground unfreezes, it releases oxidizing iron and sulfuric acid into the water, which results in rusty orange hues. This discoloration is indicative of high concentrations of heavy metals saturating the rivers, with potential repercussions for the delicate ecosystems and communities dependent on these waterways.

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The Study of Orange Rivers

To address the complexities of this issue, an ongoing study is diligently documenting the occurrences and the timing of their onset. The United States Geological Survey is actively involved in this research initiative.

This study involves sampling stream chemistry and testing hypotheses related to the causes of the contamination. Researchers are also exploring links between the changing landscape due to warming and thawing and the potential implications for downstream water quality and ecosystems. 

"The Arctic is warming at a faster rate than other regions across the globe, with considerable consequences for terrestrial and aquatic ecosystems," warns the National Parks Service in an article.

Changing pH Levels

Scientists are particularly concerned about the shifting pH levels in these rivers and the unknown impacts on their intricate ecosystems. The oxidation of minerals in the soil may be lowering the pH of the water, increasing its acidity. This could lead to the leaching of toxic metals, endangering aquatic life and posing a threat to downstream communities that rely on these rivers for fish and drinking water.

Becky Hewitt, an environmental studies professor at Amherst College, expressed her alarm regarding the pH issue, emphasizing its potential consequences. The health of these rivers is not only crucial for the diverse fish and wildlife but also for the human populations living in their vicinity.

Bacteria and Contamination Factors

While scientists initially understood the mechanisms behind the rusting waterways, identifying the exact cause of contamination remained a challenge. The prevailing theory suggests that thawing permafrost is exposing bedrock, leading to the release of sulfuric acid and iron—a phenomenon known as acid-rock drainage.