Scientists track the loss of marine ice with earthquake sensors

“The most important factor”

In many ways, the Arctic carries the keys to the future of our planet.

“The loss of marine ice in the Arctic is the most important factor in climate change,” said Macayeal, the ice scientist who has studied polar snow decades ago.

Marine ice plays a huge role in the Earth's climate. It maintains ocean salinity in the examination and settles huge currents, whether the ocean or the atmosphere, which revolves around the world. But the Arctic heats up faster than anywhere on the floor; Since the late 1970s, when we started observation via satellite, the American American ice and ice data center estimated that we lost about 30,000 square miles of marine ice every year.

Scientists want to understand the extent of these changes and what it might mean in the future, but it is so difficult to reach the region to the point that they have to rely heavily on the images taken by satellites.

While satellite shots are useful, they contain defects. Pictures are usually taken only once daily or less, their solution is limited and can only show the width from the top.

The problem is that the ice is dynamic, complex and three. For example, it is difficult to know how density of the ice from the top, the thickness is very important – the amateur snow lasts longer and behaves differently in climate change, which is also important for the ecosystems in the Arctic.

The ice also turns and moves constantly because it interacts with the ocean water, air and land; It is difficult to assemble a full image if you get only clips once a day.

Waves and warnings

Scientists turned their attention to the northern Island of Elismir, where a seismic station has been taking readings since 1990. It is located in an area known to the original Inukttut peoples as Tuvaijuittuq or “the last ice zone”; This is where the effects of several -year -old marine ice have declined over the past decades.

While the station is watching the Earth, the waves that were shattered against the island. Usually, scientists filter this “noise” to focus on the deepest land signals. But this time they turned their attention directly to the background noise.

They found specific patterns of data. “In the winter, the sensors pick up less noise because the expanded marine ice mixed the waves,” Chen, a PhD student in geophysical sciences. “But in the summer, the ice melts and the ocean waves becomes higher.”

In addition to the annual courses, scientists saw a clear increase in noise over time. This is associated with satellite images that show less and less sea ice over the years, especially the ice that has been frozen for several years. The least ice means that the waves collide with the beach often.

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