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Oceans lose oxygen year after year

Global warming is advancing by leaps and bounds, affecting every corner of the planet. One of the most damaged ecosystems is the sea surface. It is estimated that since 1930 the seas have lost 55% of the oxygen they need to preserve the life that lives inside them. But the most alarming thing about the case is that the process of deterioration continues and now investigators are looking for a way to repair it.

We must learn more about the deoxygenation process

Before thinking of any solution that can counteract the damage caused by climate change, it is important to understand what this deoxygenation process that is killing the oceans annually is all about. According to the researchers, it is estimated that more and more marine areas are running out of oxygen. Almost half of the oceans are already in this precarious situation.

While oxygen in the sea is vital to marine life, it also affects the entire land surface. As explained by Andreas Oschilies, researcher at GEOMAR Helmholtz Center for Ocean Research Kiel. In his
most recent study published in the journal Science: “what affects life inside the ocean will also damage the terrestrial environment“.

Thanks to the team of researchers that make up the United Nations Intergovernmental Oceanographic Commission, founded in 2016, we now have a more accurate idea of which areas of the ocean are most affected. The Globla Ocean Oxygen Network is a working group dedicated to measuring oxygen levels in the sea. Because they were able to conclude that the parts that should be taken care of the most are the coasts, estuaries and shallow beaches.

The main causes of lack of oxygen in the sea

For years there have been multiple investigations related to the level of oxygen in the sea. But the one mentioned above was the first to carry out an analysis by pooling the test drops extracted both in the open sea and on the coasts. They are usually studied separately, but by merging the data they got a much more accurate result than should be done.

The first thing they could see is that the hotter the water, the less oxygen it will contain. So the seas 90 to 670 meters deep are the most deteriorated. Normally it is necessary for the surface water to meet that of the depths to create air bubbles, but being the first one warmer, it is impossible for this natural process to be carried out satisfactorily.

Among the other causes that we can attribute to the increase of temperature in the sea is the great quantity of algae that exist in some zones, to the existence of a great number of them their  process of decomposition absorbs all the oxygen and the life is precarious. The most immediate damage after this is the problem of growth and reproduction of the animals.

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