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In the Arctic, some of the highest erythemal irradiances on record were measured in March and April 2020. In spring 2019, erythemal UV radiation was at the minimum of the historical (1991–2018) range at the South Pole, while near record-high values were observed in spring 2020, which were up to 80% above the historical mean. Variability of erythemal irradiance in Antarctica was very large during the last four years. For southern latitudes exceeding 50°, the UV Index (UVI) would have surged by between 25% (year-round at the southern tip of South America) and more than 100% (South Pole in spring). Without the Montreal Protocol, erythemal (sunburning) UV irradiance at northern and southern latitudes of less than 50° would have increased by 10–20% between 19.

Changes in UV radiation at low- and mid-latitudes (0–60°) during the last 25 years have generally been small (e.g., typically less than 4% per decade, increasing at some sites and decreasing at others) and were mostly driven by changes in cloud cover and atmospheric aerosol content, caused partly by climate change and partly by measures to control tropospheric pollution. The assessment is performed in the context of the Montreal Protocol on Substances that Deplete the Ozone Layer and its Amendments and Adjustments. The Boost feature cleans your temporary files and improves your memory usage.This assessment provides a comprehensive update of the effects of changes in stratospheric ozone and other factors (aerosols, surface reflectivity, solar activity, and climate) on the intensity of ultraviolet (UV) radiation at the Earth’s surface.

It is designed to keep your PC running smoothly through several maintenance and security features. It is a maintenance app that offers super-fast virus removal, a one-click speed boost, and a complete system security check. It is a maintenance app that offers super-fast virus removal. Free Download Microsoft PC Manager's latest version standalone offline installer for Windows.

PC Manager 3.4.6.0 download the new for mac