Over the Central part of the Arctic was first recorded ozone hole: the ozone concentration in the atmosphere decreased by 90 percent. The area of the hole is about six million square kilometers, but in the coming weeks, with the onset of spring and warming of the air, the hole will begin to shrink and disappear. The observation results are regularly published on the portal of NASA Ozone Watch.
The annual depletion of the ozone layer typical for the South pole, where it is promoted by natural conditions of stable low temperatures, the formation of nacreous clouds and flowing on the surface of the chemical reaction between ozone and the substances that Deplete it. With the adoption of the Montreal Protocol, the ozone concentration in the atmosphere over Antarctica is beginning to recover, but the seasonal formation of holes is inevitable.
The Arctic is also characterized by variable temperatures, and the ozone hole above it are rare. By the end of March in the measuring balloons over the North pole at a height of 18 kilometers there was a fall in the ozone content at 90 percent. The balloons typically measure approximately 3.5 ppm (parts per million) of ozone in this time of year, a week ago rates were at around 0.3 ppm. According to Martin Dameris (Martin Dameris) of the German aerospace center in Oberpfaffenhofen, this event can be considered the first real appearance of the ozone hole over the North pole in the entire history of observations.