Science

Earth's Ozone Hole Shrivels to Smallest Since 1988

Earth's Ozone Hole Shrivels to Smallest Since 1988”

It's a molecule made up of three oxygen atoms, O3, and is less chemically stable than the regular O2 molecule.

The massive hole in our ozone layer has been one of the biggest environmental concerns for decades, but a surprising new report indicates that it has shrunk to its smallest size at peak since 1988.

Heavy use ozone-damaging chemicals - in particular, clorofluorocarbons and hydrochlorofluorocarbons (CHCs and HCHCs) used in old-timey fridges and spray cans - burned a gaping hole in this layer in the 70's and 80's.

Thirty years ago, the global community signed the Montreal Protocol on Substances that deplete the Ozone Layer and began regulating ozone-depleting compounds. Similar reactions occur with bromine.

At its peak on September 11, 2016, the ozone hole extended across an area almost two and a half times the size of the continental United States. NASA report informed that during the latest review, ozone hole reduced 1.3 million square miles compared to past year.

This year's unusually warm weather caused a warm Antarctic vortex to minimize stratospheric cloud formation.

The hole in our planet's ozone layer is getting patched up.

While that sounds like a lot, it's actually 1.3 million square miles less than the peak a year ago, and 3.3 million square miles less than in 2015.

The ozone hole was largest in 2000, when it was 29.8 million sq km wide, according to the National Aeronautics and Space Administration (Nasa).

Warmer-than-usual weather conditions in the stratosphere are to be thanked for the shrinkage since previous year, as the warmer air helped fend off chemicals such as chlorine and bromine that eat away at the ozone layer, scientists said.

However, scientists said that two years of lower-than-usual ozone hole extent isn't a sign that the ozone layer is healing faster than expected. High in the atmosphere, about 7 to 25 miles (11 to 40 kilometers) above the Earth, ozone shields Earth from ultraviolet rays that cause skin cancer, crop damage and other problems. "The average area of these daily ozone hole maximums observed since 1991 has been roughly 10 million square miles". Exposure to higher levels of UV radiation (such as those associated with a thinned ozone layer) significantly raise the risks of developing cataract and skin cancer. The Aura satellite's Microwave Limb Sounder also measures certain chlorine-containing gases, providing estimates of total chlorine levels.

In the upper atmosphere, CFCs break apart, freeing chlorine to react with ozone molecules, a reaction that creates oxygen and chlorine monoxide.

This year, the ozone concentration reached a minimum over the South Pole of 136 Dobson Units on September 25- the highest minimum seen since 1988. However, that concentration is still low compared with the 1960s, before man-made compounds created the ozone hole. "This year our balloon measurements showed the ozone loss rate stalled by the middle of September and ozone levels never reached zero".



Like this

loading...
loading...

Latest


07 November 2017
Bon-Ton delisted from NASDAQ; stock trading over the counter this week
Chesapeake Energy Corporation (NYSE:CHK) shares are gapping higher 1.60% pre-market with a price of $3.79 on the stock. Analysts, on average, seem bearish as they suggest BONT is worth $-0.63 less, giving a target price of $0 a share.

07 November 2017
Melania Trump visits luxury pearl retailer in Tokyo
About five strokes later, Melania had written the first character for " peace " in Japanese and Akie wrote the second. President Trump is on an 11-day trip to Asia to improve relations and discuss the nuclear threats from North Korea.

07 November 2017
Diebold Inc (NYSE:DBD) Shifting Institutional Investors Sentiment
Stock Plunged Today" published on July 05, 2017 as well as Reuters.com's news article titled: "BRIEF-Diebold Nixdorf Inc - GARY G. It turned negative, as 82 investors sold NKE shares while 439 reduced holdings. 34 funds opened positions while 87 raised stakes.

07 November 2017
Philippines conglomerate San Miguel to combine food, beverage arms
The company put this down to "creative marketing and sales executions", which allowed it to push into new geographical regions. San Miguel told the Nikkei Asian Review the move is aimed at making it "easier for investors" to buy into the companies.

07 November 2017
Are Analysts Bearish Lamar Advertising Company (NASDAQ:LAMR) After Last Week?
Alpha Cubed Investments LLC acquired a new stake in Lamar Advertising during the third quarter worth approximately $211,000. It has underperformed by 3.05% the S&P500.The move comes after 8 months positive chart setup for the $5.85 billion company.

07 November 2017
Gionee M7 Power To Be Released In India Soon
At the rear, the device features a 13-megapixel primary shooter with phase detection autofocus and an LED flash. The main camera has PDAF, and f/2.0 aperture and the device runs on Android 7.1.1 Nougat topped with Amigo 5.0.

07 November 2017
EPS for Gol Linhas Aereas Inteligentes SA (ADR) (GOL) Expected At $0.18
It turned negative, as 57 investors sold NWL shares while 227 reduced holdings. 65 funds opened positions while 84 raised stakes. The stock of Gol Linhas Aereas Inteligentes SA (ADR) (NYSE:GOL) has "Buy" rating given on Thursday, February 2 by Deutsche Bank.

07 November 2017
No, You Can't Run on Miami's Airport Tarmac
It is now unknown whether the man was carrying a weapon, but the Herald's source finds the incident "very concerning" either way. An unidentified man at the Miami International Airport sneaked past a checkpoint on a conveyor belt intended for luggage.

07 November 2017
Lowe's Companies, Inc. (LOW) Shares Bought by Ffcm LLC
TRADEMARK VIOLATION WARNING: This piece of content was originally reported by Week Herald and is the property of of Week Herald. Twelve research analysts have rated the stock with a hold rating and seventeen have given a buy rating to the company.

07 November 2017
Will Ferrell Has Revealed The Plot For A Scrapped Step Brothers Sequel
It nearly happened a few years ago: following the box-office success of the original, written by Ferrell and also starring John C. But whilst there were murmurings about Step Brothers 2 around the time of its release, nothing was ever realized.