The earth warms up to create

The undersea creatures such as fish and crabs that are washed away by dead on the beaches of Oregon State (USA) are being destroyed by the re-emergence of ' dead waters ' with more open areas than those of last year.

Fish and dead crabs on Oregon beach. (Photo: baocantho) Many signs that the " dead waters " are spreading north to the Olympic Peninsula, Washington state. This situation according to scientists may be a consequence of global warming.

After studying oxygen-deficient waters over 110 km along the continental shelf between the city of Florence (Arizona) and Lincoln (Oregon), the Pew Ocean Commission expert team concluded ' dead waters ' were formed. It is due to the period of plankton blooms on the sea surface, which, when dying and sinking into the sea floor, becomes a source of food to feed the bacteria that absorb all the oxygen in the sea water.

In 2002, scientists first noticed a " dead water " off the city of Newport (California), which came from a cold, nutrient-rich but oxygen-poor stream of water from the Arctic. Since then, the ' dead waters ' have reappeared every summer, but before that there was always a flow of cold water and abundant nutrients from the bottom rising to the surface of the sea, which were associated with periods of ' manifestation '. Positive force 'of plankton.

Oxygen levels are generally very low in deep water, but it is unusual that this year low oxygen waters tend to move into shallow waters (about 15 m) and face the shore, where the richest aquatic ecosystem is located. . Deep-water fishes such as cod, fish . are emerging in shallow waters in Oregon, indicating that the area of ​​dead water is heading to the shore. In addition to some states in the United States, the waters off Nambia, South Africa in the Atlantic Ocean and offshore Peru in the Pacific also appear similar to ' dead waters ' in Oregon.

M.THAO