Earth's ozone hole found to be shrinking

Enlarge Image This animation shows changes in the ozone hole size over time.                  NASA  NASA Ozone Watch  Katy Mersmann

The hole in earth's protective Ozone layer shrank to the smallest it's been since 1988 due to higher temperatures over Antarctica in 2017, according to the study done by NASA scientists.

According to a press release, the hole in the Earth's ozone layer is 1.3 million square miles smaller than past year and 3.3 million square miles smaller than 2015.

"This is what we would expect to see given the weather conditions in the Antarctic stratosphere", Newman added. But the hole's overall reduction can be traced to global efforts since the mid-1980s to ban the emission of ozone-depleting chemicals. "The Antarctic ozone hole was exceptionally weak this year", Paul A Newman, chief scientist for Earth Sciences at NASA's Goddard Space Flight Centre said in a statement. "This is a year in which the weather conditions led to better ozone (formation)". The reactions of these chemicals are destroying ozone molecules.

Higher temperatures in the stratosphere, on the other hand, allow ozone to remain more stable in the atmosphere, meaning they keep the ozone hole smaller on a year-to-year basis. This helped minimize polar stratospheric cloud formation in the lower stratosphere. Moreover, the ozone hole still covers an area that is more than two and a half times Australia's size, measuring almost 20 million square kilometers.

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

However, the researchers have said that a smaller ozone hole this year is not a sign of rapid healing but rather caused by a natural variability.

NASA scientists expect that the ozone hole will return to the 1980 levels sometime around 2070.

NASA and NOAA monitor the ozone hole via three complementary instrumental methods. Every year, the hole reaches its peak at different date. During the 1960s, before the Antarctic ozone hole occurred, average ozone concentrations above the South Pole ranged from 250 to 350 Dobson units. A lack of these clouds is one of the reasons why the ozone layer recovered strongly.

"In the past, we've always seen ozone at some stratospheric altitudes go to zero by the end of September", said Bryan Johnson, NOAA atmospheric chemist.

Related news:

Hot News

isis-killer-beheading-video-story-top Fire Officials Remind to Check Smoke Detector Batteries This Weekend
Nov 05, 2017 - 03:08
Plans should include at least two different ways each family member could escape various parts of the home. Carbon monoxide alarms should be installed on every level of the home and outside sleeping areas.

IShares Core MSCI Pacific (IPAC) Rises 0.05% for Nov 4
Nov 05, 2017 - 03:05
On the other side, a stock may be considered to be in a downtrend if trading below the moving average and sloping downward. The simple moving average is a mathematical calculation that takes the average price (mean) for a given amount of time.

isis-killer-beheading-video-story-top Justice Dept. alleges ACLU misled government about timing of teen's abortion
Nov 05, 2017 - 02:53
Texas law requires women planning to undergo abortions to attend counseling 24 hours in advance of the procedure. Jane Doe all along had planned to pay for her own abortion and arranged transportation to and from appointments.

isis-killer-beheading-video-story-top Ex-PM Sharif returns to Pakistan for court hearing
Nov 05, 2017 - 02:48
Sharif and his supporters have denied the allegations and hinted at a political conspiracy driven by the powerful military. He asserted the PML-N struggled for the freedom of judiciary.

isis-killer-beheading-video-story-top Asos (LON:ASC) Rating Reiterated at Shore Capital Today
Nov 05, 2017 - 02:48
Kepler Capital Markets upgraded BP p.l.c. from a reduce rating to a hold rating in a research note on Tuesday, October 3rd. The price target suggests a potential upside of 29.08 % from the previous stock close of Glaxosmithkline (LON: GSK ).

isis-killer-beheading-video-story-top 'Hindu terrorism' remark: Varanasi court to hear case against Kamal Haasan today
Nov 05, 2017 - 02:46
BJP leader Subramanian Swamy responded to Haasan's claim of "Hindu terror" and called him a "morally corrupt person". He reportedly lambasted them saying they have started resorting to terrorism to propagate their communal agenda.

isis-killer-beheading-video-story-top Hot Stock to Watch: Discovery Communications, Inc. (DISCA)
Nov 05, 2017 - 02:44
Ballentine Partners LLC bought a new stake in Discovery Communications during the second quarter worth approximately $133,000. BidaskClub downgraded Discovery Communications from a hold rating to a sell rating in a research note on Thursday, July 27th.

isis-killer-beheading-video-story-top Kmart, 18 Sears stores to close in January
Nov 05, 2017 - 02:42
Vendors have pulled back shipments to Sears and Kmart, concerned that they won't be paid if the company files for bankruptcy. The stores, including Sears in Phillipsburg, will close late January 2018 but will still be open during the holiday season.

isis-killer-beheading-video-story-top 'Lion King' live-action cast revealed, including Beyoncé as Nala
Nov 05, 2017 - 02:41
With me and Seth Rogen as Timon and Pumba! JD McCrary and Shahadi Wright Joseph will play Young Simba and Nala . Beyonce is to star in a remake of Disney's " The Lion King ", directed by Jon Favreau .

isis-killer-beheading-video-story-top Residents of Chennai flee flooded homes as rains continue
Nov 05, 2017 - 02:33
An IANS report quotes official sources stating that the number of rain-related deaths in the Tamil Nadu has risen to 14 so far. Chennai-based India off-spinner faced some hardship while driving back home yesterday but urged residents not to panic.

isis-killer-beheading-video-story-top Taylor Swift Sells "Reputation" Version of Sweater She Accidentally Wore Backwards
Nov 05, 2017 - 02:29
"My baby's fit like a daydream / Walking with his head down / I'm the one he's walking to / So call it what you want , yeah", she croons.

isis-killer-beheading-video-story-top OnePlus 5T Name, 3.5mm Jack Presence All But Confirmed
Nov 05, 2017 - 02:18
And if you prefer wireless headphones, our flagships have excellent Bluetooth capability for this choice. This is one of those times when we respectfully disagree on what it means to be courageous.

isis-killer-beheading-video-story-top Preity Zinta saddened by demise of Quaid's daughter Dina
Nov 05, 2017 - 02:10
The last time Dina visited Pakistan was in 2004, accompanied by her son Nusli Wadia and her grand children Jehangir and Ness. Jinnah, in his will, had left the $400 million property for his sister Fatima, who died shortly after his demise .

isis-killer-beheading-video-story-top Lebanese prime minister suggests he fears for his life, resigns
Nov 05, 2017 - 01:59
In tweets after meeting Hariri, al-Sabhan criticized the Lebanese government for tolerating Hezbollah's criticism of the kingdom. The coalition government he led brought together nearly all of the main political parties in Lebanon, including Hezbollah.

isis-killer-beheading-video-story-top Guru Nanak Birthday, Guru Nanak Jayanti Date, timing and significance
Nov 05, 2017 - 01:58
President Ram Nath Kovind also greeted the nation and urged all to follow on the footsteps of the Sikh Guru. Summary: People also gathered at Gurdwara Singh Shaheedan in Sohana to pay their respects.