Why is Newark Lake a double-decker lake?

The waters of Lake Newark are well defined. Why is this magical phenomenon happening? What is the reason why different water layers do not "invade" each other? Let's talk about why Newark Lake is a double-decker lake.

Lake Newark is formed by the rise of the bay. Because of the abundant snowfall in winter and the extremely cold climate on the lake surface, fresh water can never be mixed with salt water, and the proportion of seawater is greater than that of fresh water, so it all sinks to the bottom of the lake. Moreover, the fresh water layer of Lake Nuuk, which is more than two meters thick in the upper part of the Arctic Circle, is often frozen into ice and cannot flow. In this way, the interface between fresh water and seawater is particularly clear.

There is a Newark Lake in Cape Barrow, Alaska, USA, which is180m long and about 6m deep. There is a long and narrow land in the north that separates Lake Newark from the Arctic Ocean. The lake is divided into two layers, maintaining a clear dividing line: the upper layer is where fresh water and freshwater fish live; The lower layer is slightly bitter salt water, with marine animals and plants. The upper organisms and the lower organisms don't communicate with each other and live in their own waters, so people call it a "double-layer lake".

Through research, scientists finally came to the conclusion that the lake was originally formed by the rise of the bay. It used to be a low-lying land, and its north is a long and narrow land, which is separated from the North Sea like a dam.

Because of the abundant snowfall in winter, a large amount of melted snow water flows into this "pocket" in spring, and because the climate of the lake is extremely cold, these fresh water can never be mixed with salt water. Sometimes the sea water in the north is stirred up by the storm at sea, over the narrow "long dike" and thrown into the lake. The proportion of seawater is greater than that of fresh water, so it all sinks to the bottom of the lake.

Therefore, the water at the bottom of Lake Nuuk is more salty than the sea water near the ocean. Moreover, the fresh water layer of Lake Nuuk, which is more than two meters thick in the upper part of the Arctic Circle, is often frozen into ice and cannot flow. In this way, the interface between fresh water and seawater is particularly clear.