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Algae dye lakes
While substances such as algae and sediment can affect the color of lakesThe new study found that air temperature, rainfall, lake depth and height also play an important role in determining the most common water color in lakes.
to tend blue lakesaccounting for less than a third of the world’s lakes, are deeper and found in areas with heavy rainfall and winter ice cover.
Two thirds of the world’s lakes are endangered
The study found that brown and green lakes, which account for 69% of all lakes, are more widespread and are found in the driest areas, inland and along the coasts.
The researchers used 5.14 million images satellite for 85,360 lakes and reservoirs worldwide from 2013 to 2020 to determine the most common water color.
Xiao Yang, sensor hydrologist and author of the study, says: "Nobody studied The color of the lakes On a global scale, there have been previous studies on perhaps around 200 lakes around the world, but the size we are trying here is much larger in terms of the number of lakes and even the coverage of small lakes, although we don’t study every single one. lake of the Earth, we try to cover a large and representative sample of our lakes".
Seasonal change in the color of the lake
The color of the lake may vary in part seasonally, due to changes in the growth of algaeThen, the authors described the lake color by evaluating the most common lake color over a seven-year period.
Additionally, the new study revealed how different degrees of warming could affect water color if climate change continued, as the study found that climate change can reduce the proportion of blue lakes, many of which are found in the Rocky Mountains. , northeastern Canada and north Europe and New Zealand.
water temperature
Catherine O’Reilly, Illinois State University aquatic ecologist and author of the new study, says: "Warmer water, which produces more algae, tends to turn lakes green, and there are many examples of places where people have actually seen this happen when studying a lake."
For example, the Great Lakes in North Amarica An increase in algal blooms is also among the fastest growing lakes, the study notes.
The color of the water is a guide to its quality
Yang adds that previous research has also shown that the areas of North Pole The hinterland has greener lakes, and although previous studies have used more complex and accurate metrics to understand the overall health of a lake’s ecosystem, water color is a simple but applicable measure of water quality that can be seen by satellites globally, the authors said.
According to the study, if you use lakes for fishing fish o for sustenance or drinking water, changes in water quality that most likely occur as lakes become greener will likely mean that the water will be more expensive to treat, there may be times when the water is unusable and fish species may not be present, so we will not have the same services environmental system Mainly from those lakes when they turn from blue to green."
damage to tourism
Catherine O’Reilly concludes: "Nobody wants to swim in a green lake, aesthetically speaking, some lakes that we always thought were sanctuaries or spiritual places, those places can disappear with a color change of heating and the persistence of climate change".
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Algae dye lakes
While substances such as algae and sediment can affect the color of lakesThe new study found that air temperature, rainfall, lake depth and height also play an important role in determining the most common water color in lakes.
to tend blue lakesaccounting for less than a third of the world’s lakes, are deeper and found in areas with heavy rainfall and winter ice cover.
Two thirds of the world’s lakes are endangered
The study found that brown and green lakes, which account for 69% of all lakes, are more widespread and are found in the driest areas, inland and along the coasts.
The researchers used 5.14 million images satellite for 85,360 lakes and reservoirs worldwide from 2013 to 2020 to determine the most common water color.
“Nobody studied The color of the lakes On a global scale, there have been previous studies on perhaps around 200 lakes around the world, but the size we are trying here is much larger in terms of the number of lakes and even the coverage of small lakes, although we don’t study every single one. lake of the Earth, we try to cover a large and representative sample of our lakes.
Seasonal change in the color of the lake
The color of the lake may vary in part seasonally, due to changes in the growth of algaeThen, the authors described the lake color by evaluating the most common lake color over a seven-year period.
Additionally, the new study revealed how different degrees of warming could affect water color if climate change continued, as the study found that climate change can reduce the proportion of blue lakes, many of which are found in the Rocky Mountains. , northeastern Canada and north Europe and New Zealand.
water temperature
“Warmer waters, which produce more algae, tend to turn lakes green and there are many examples of places where people have actually seen this happen when they study,” says Catherine O’Reilly, an aquatic ecologist at Illinois. State University and author of the new one lake study.
For example, the Great Lakes in North Amarica An increase in algal blooms is also among the fastest growing lakes, the study notes.
The color of the water is a guide to its quality
Yang adds that previous research has also shown that the areas of North Pole The hinterland has greener lakes, and although previous studies have used more complex and accurate metrics to understand the overall health of a lake’s ecosystem, water color is a simple but applicable measure of water quality that can be seen by satellites globally, the authors said.
According to the study, if you use lakes for fishing fish o for sustenance or drinking water, changes in water quality that most likely occur as lakes become greener will likely mean that the water will be more expensive to treat, there may be times when the water is unusable and fish species may not be present, so we will not have the same services environmental system Mainly from those lakes when they turn from blue to green “.
damage to tourism
Catherine O’Reilly concludes: “Nobody wants to swim in a green lake. Aesthetically speaking, some lakes that we may have always thought were sanctuaries or spiritual places, those places could disappear with a color change of heating and ongoing climate change.
