Bookmark Kaumudi Online  Bookmark this site  Editor@Kaumudi  |  Marketing  Print Advt rates  |  Calendar 2012        Go!    
 
 
December 18, Monday 2017 12:53 AM       

       HEADLINES: Ockhi: Search to spread to coast of Goa                                              Financial aid for Ockhi victims should not be misused                                              UDF team seeks time to meet PM                                              Ockhi: State govt prepares presentation to make Modi understand extent of tragedy                                              Ockhi: Minister says estimates after Christmas; one more dead body found                                              Now, escort companies in Goa demand Aadhar details                                              RK Nagar bypoll: DMK accuses AIADMK of bribing voters                                              Indian Air Force gets two more women fighter pilots                                              Brexit deal proves critics wrong: Theresa May                                              Global terrorist Saeed issues warning to India                                              Eight killed in Quetta church attack                                              Dhawan and spinners power India to ODI series win over Lankans                                              Indian hopes shatter as Sindhu loses Dubai Open title clash                                              Perth Test: Bowlers grind down England before heaven opens up                                              ISL 2017-18: Chennaiyin FC beat Bengaluru FC 2-1                                              Kaumudi Facebook
       SCI&TECH Next Article: Marijuana can dull the brain in some HIV patients  
       2017 ozone hole smallest since 1988: NASA
 
         Posted on :01:48:50 Nov 4, 2017
   
A A
       Last edited on:01:48:50 Nov 4, 2017
         Tags: 2017 ozone hole smallest since 1988: NASA
 

The hole in Earth's ozone layer that forms over Antarctica each September was the smallest observed since 1988, NASA satellite measurements from this year have revealed.

The ozone hole reached its peak extent on September 11, covering an area about two and a half times the size of the US - 7.6 million square miles in extent - and then declined through the remainder of September and into October, according to scientists from NASA.
 
Ground- and balloon-based measurements from the National Oceanic and Atmospheric Administration (NOAA) also showed the least amount of ozone depletion above the continent during the peak of the ozone depletion cycle since 1988.
 
NOAA and NASA collaborate to monitor the growth and recovery of the ozone hole every year.
"The Antarctic ozone hole was exceptionally weak this year," said Paul A Newman from NASA.
"This is what we would expect to see given the weather conditions in the Antarctic stratosphere," said Newman.
The smaller ozone hole this year was strongly influenced by an unstable and warmer Antarctic vortex - the stratospheric low pressure system that rotates clockwise in the atmosphere above Antarctica.
This helped minimise polar stratospheric cloud formation in the lower stratosphere.
The formation and persistence of these clouds are important first steps leading to the chlorine- and bromine- catalysed reactions that destroy ozone, the scientists said.
 
These Antarctic conditions resemble those found in the Arctic, where ozone depletion is much less severe.
Last year, the ozone hole reached a maximum 8.9 million square miles, 2 million square miles less than in 2015.
The average area of these daily ozone hole maximums observed since 1991 has been roughly 10 million square miles.
The scientists said the smaller ozone hole extent in 2016 and 2017 is due to natural variability and not a signal of rapid healing.
 
NASA and NOAA monitor the ozone hole via three complementary instrumental methods.
"In the past, we have always seen ozone at some stratospheric altitudes go to zero by the end of September," said Bryan Johnson, NOAA atmospheric chemist.
"This year our balloon measurements showed the ozone loss rate stalled by the middle of September and ozone levels never reached zero," said Johnson.
A A
       SCI&TECH
Next Article: Marijuana can dull the brain in some HIV patients
 
 
SCI&TECH HEADLINES
Eighth planet found in faraway solar system, matching ours  
Google brings a host of new features on Pixel 2  
Scientists turn beer into suitable petrol  
Space gives a sense of humbleness: NASA astronaut  
Researchers discover genes to prolong human life  
Google announces best apps of 2017  
This technology can help to reduce accidents on icy roads  
Yepzon launches in India; promises smart safety solutions  
Soon, you'll be able to control diabetes with your phone  
Turning bacteria into 'world's smallest tape recorders'  
How breastmilk protects babies from food allergy decoded  
Stars among the oldest in our galaxy discovered  
Apple delays release of smart speaker - HomePod  
Owning a dog may add years to your life  
'Textisms' actually add meaning to written words  
Sugar may heal wounds, says study  
Heart-stopping sex? It's rare  
Over 1.3 lakh Indians 'book ticket' to Mars  
China all set to make first contact with aliens  
Greenland Ice sheet could be losing mass, says study  
'Flying taxis' could be a thing by 2020  
When art comes to the rescue of depressed patients  
Here's a mechanism that can help you get rid of bad memories  
2017 ozone hole smallest since 1988: NASA  
Marijuana can dull the brain in some HIV patients  
 
Do you support Adv Aloor's criticism that judges in lower courts lack guts?
Yes
 
No
 
No opinion
 
 
 
Home Kerala India World Business Sports Sci&Tech Education Automobile CityNews Movies Environment Letters 
© Copyright keralakaumudi Online 2011  |  Reproduction in whole or in part without written permission is prohibited.
Head Office Address: Kaumudi Buildings, Pettah P.O, Trivandrum - 695024, India.
Online queries talk to Deepu Sasidharan, + 91 98472 38959 or Email deepu[at]kaumudi.com
Customer Service -Advertisement Disclaimer Statement   |  Copyright Policy