In this season of new beginnings, the hole in the ozone layer reforms, allowing lethal ultraviolet radiation to stream through Earth's atmosphere.The hole lasts for only two months, but its timing could not be worse.According to a United Nations report, the annual dose of harmful ultraviolet radiation striking the northern hemisphere rose by 5 percent during the past decade.
In this season of new beginnings, the hole in the ozone layer reforms, allowing lethal ultraviolet radiation to stream through Earth's atmosphere.The hole lasts for only two months, but its timing could not be worse.According to a United Nations report, the annual dose of harmful ultraviolet radiation striking the northern hemisphere rose by 5 percent during the past decade.Tags: Domestic Violence Research Paper TopicsInterpretation Of A Poem EssayAnne Frank Play Essay QuestionsEssay On Advantages Of InternetHappiness In Marriage Is Entirely A Matter Of Chance EssayResearch Papers Theological
Like many lines of scientific inquiry, research leading to the prediction and discovery of global ozone depletion and the damaging effects of CFCs followed a path full of twists and turns.
Investigators did not set our to determine whether human activity affects our environment nor did they know much about chemical pollutants.
“The storm thundered and lightened, and the air was filled with sulfur,” Homer wrote in the Odyssey, referring to the sharp odor, created during thunderstorms, of what later became known as ozone. By measuring the spectrum of air, the Belgian scientist M. Migeotte demonstrated in 1948 that methane is a common constituent of the atmosphere with a concentration of about one part per million by volume.
By the late 1800s, atmospheric scientists had isolated carbon monoxide and inferred the existence of a second combustible gas in the air, which they tentatively identified as methane, the simplest hydrocarbon. Soon, scientists had the tools to detect other atmospheric gases that occur in concentrations one-tenth to one-hundredth as great as that.
Each day, the sun lingers in the sky, just a little longer and the harsh polar winter slowly gives way to spring.
Spring also brings another type of light to the Antarctic, a light that harms instead of nurtures.
These compounds play crucial roles in such phenomena as urban smog, the loss of stratospheric ozone, and the global removal of atmospheric impurities.
Scientists had not detected free radicals because they reside in the atmosphere at concentrations well below the part-per-million level that state-of-the-art equipment in 1948 could detect.
This biologically damaging, high-energy radiation can cause skin cancer, injure eyes, harm the immune system, and upset the fragile balance of an entire ecosystem.
Although, two decades ago, most scientists would have scoffed at the notion that industrial chemicals could destroy ozone high up in the atmosphere, researchers now know that chlorine creates the hole by devouring ozone molecules.