This slides includes all the topics about the ozone layer, ozone depletion, causes and effects. the significant of ozone layer.
This slide emphasize the purpose of ozone layer in our daily living.
This presentation is about Ozone Layer and chemicals known to cause its depletion.
It also covers information about Ozone Hole and Correlation between Ozone depletion and skin diseases due to Ultra Violet light.It also contains no. of ways to limit ozone deterioration.
The PPT Brief About the Ozone Layer?,
Where it is located?,
Why It is Important?
Why it is depleting?,
What are the effects of the Ozone Depletion?,
What to be done to save the ozone layer ?.
Atmospheric ozone protects the Earth and its inhabitants from the harmful ultraviolet radiation of the Sun. Without this protective layer, more ultraviolet radiation would reach the surface of the Earth and cause damage to plant, animal and human life. This module explains the importance of ozone, the causes of its depletion and the effects expected on earth's systems.
This is PPT was presented by Mr. Girishwar of 9th std, JNV Lepakshi, to the INOVIT-2015 organised by Vellore Institute of Technology, Vellore, Tamilnadu on 24-25th Jan 2015.
This presentation is about Ozone Layer and chemicals known to cause its depletion.
It also covers information about Ozone Hole and Correlation between Ozone depletion and skin diseases due to Ultra Violet light.It also contains no. of ways to limit ozone deterioration.
The PPT Brief About the Ozone Layer?,
Where it is located?,
Why It is Important?
Why it is depleting?,
What are the effects of the Ozone Depletion?,
What to be done to save the ozone layer ?.
Atmospheric ozone protects the Earth and its inhabitants from the harmful ultraviolet radiation of the Sun. Without this protective layer, more ultraviolet radiation would reach the surface of the Earth and cause damage to plant, animal and human life. This module explains the importance of ozone, the causes of its depletion and the effects expected on earth's systems.
This is PPT was presented by Mr. Girishwar of 9th std, JNV Lepakshi, to the INOVIT-2015 organised by Vellore Institute of Technology, Vellore, Tamilnadu on 24-25th Jan 2015.
With the various pre-and post wedding functions and rituals you along side your spouse equivalent area unit each physically and mentally exhausted to the extent that you just need a extremely long break.
Ozone layer - Guardian of our planet /importance of it/depletion and recovery...VedantKotadiya
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere (see details below). ... CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.
The ozone layer that shields life from cancer-causing solar rays is recovering at a rate of one to three percent per decade, reversing years of dangerous depletion caused by the release of harmful chemicals, a U.N. study said on November 5. “The Antarctic ozone hole is recovering, while continuing to occur every year.
Ozone Layer Depletion, Greenhouse Effect & Global WarmingNeetha Joseph
This is a presentation regarding some of those little threats our Earth is going through....The presentation is made interesting with a wide range of pictures, illustrations and animations...Please download to see the animated slideshow...Hope this comes of help to you!
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
2. What is ozone layer?
Who discover the ozone layer and when?
What is ozone depletion?
What happen to the ozone layer on this
day?
What is the purpose of ozone layer?
The ozone layer was built of what
chemicals?
What will happen if ozone layer is
completely depleted?
How fast the ozone depletion grows?
How to prevent the ozone depletion?
References
Prepared by
3. The ozone layer is a deep layer in
the stratosphere, encircling the Earth, that
has large amounts of ozone in it. The layer
shields the entire Earth from much of the
harmful ultraviolet radiation that comes from
the sun.
The ozone layer or ozone shield is a region
of Earth's stratosphere that absorbs most of the
Sun's ultraviolet (UV) radiation. It contains
high concentrations of ozone (O3) in relation
to other parts of the atmosphere, although still
small in relation to other gases in stratosphere.
The ozone layer contains less than 10 parts per
million of ozone, while the average ozone
concentration in Earth's atmosphere as a whole
is about 0.3 parts per million. The ozone layer
is mainly found in the lower portion of the
stratosphere, from approximately 20 to 30
kilometers (12 to 19 mi) above Earth, although
its thickness varies seasonally and
geographically.
4. The ozone layer was discovered in
1913 by the French physicists
Charles Fabry and Henri Buisson.
Measurements of the sun showed
that the radiation sent out from its
surface and reaching the ground on
Earth is usually consistent with the
spectrum of a black body with a
temperature in the range of 5,500–
6,000 K (5,227 to 5,727 °C), except
that there was no radiation below a
wavelength of about 310 nm at the
ultraviolet end of the spectrum. It
was deduced that the missing
radiation was being absorbed by
something in the atmosphere.
Eventually the spectrum of the
missing radiation was matched to
only one known chemical, ozone.
Charles Fabry
Henri Buisson.
5. Ozone layer depletion, is simply the wearing out (reduction) of the amount
of ozone in the stratosphere. Unlike pollution, which has many types and
causes, Ozone depletion has been pinned down to one major human activity.
Ozone layer depletion is one of the most serious problems faced by our
planet earth. It is also one of the prime reasons which are leading to global
warming. (ANKIT JAIN)
The depletion of ozone layer in Atlantic.
6. Before climate change, the world’s
scientists were warning us about the
hole in the ozone layer. Hannah
Osborne looks back at how an
environmental disaster was averted
and asks what the future holds.
There is a hole in the ozone layer
and it’s going to kill us all. Thirty
years ago that was a global worry.
Scientists had discovered
chlorofluorocarbons (CFCs) were
destroying the planet’s ozone – a
colourless gas that absorbs harmful
UV rays from the Sun, protecting life
on Earth. ( Metro news; Hannah
Osborne)
7. When the ozone layer absorbs the sun's ultraviolet radiation, it
creates a source of heat and regulates the temperature of the Earth's
atmosphere. If the ozone didn't filter the sun's ultraviolet radiation,
most of it would reach the Earth's surface, which would be dangerous
for plants and animals. The function of the ozone layer is to shield
the Earth from the harmful ultraviolet rays of the sun and to keep the
Earth warm. (phys.educbritania.com)
8. Ozone trioxidane and catena-
trioxygen), or trioxygen, is an
inorganic molecule with the chemical
formula O3. It is a pale blue gas with
a distinctively pungent smell. It is an
allotrope of oxygen that is much less
stable than the diatomic allotrope O2,
breaking down in the lower
atmosphere to O2 or dioxygen. Ozone
is formed from dioxygen by the action
of ultraviolet light and also
atmospheric electrical discharges, and
is present in low concentrations
throughout the Earth's atmosphere
(stratosphere). In total, ozone makes
up only 0.6 ppm of the atmosphere.
9. Land and Water Life Would Suffer
Without the ozone layer’s protection
from the sun, people, animals and plant
life would be destroyed. Even underwater
life would not be safe since UV rays can
penetrate clear water to a certain depth
before being absorbed.
Increase in Disease
However, increased exposure to the
sun’s radiation can also cause blindness
and cataracts and, alarmingly, some
experts now believe that the amount of
protection we receive from vaccinations
(for diseases such as measles) could be
reduced in people exposed to higher
levels of UV-B rays.
Our Food Chain
Many biological systems are damaged
by exposure to UV-B and research has
shown that its effects are proportional
to the time and intensity of exposure
and of course, small and delicate
organisms are much more vulnerable
to damage than larger species, such
as humans.
10. Annual Antarctic Ozone Hole Larger and
Formed Later in 2015
The 2015 Antarctic ozone hole area was
larger and formed later than in recent
years, said scientists from NASA and the
National Oceanic and Atmospheric
Administration (NOAA).
On Oct. 2, 2015, the ozone hole
expanded to its peak of 28.2 million
square kilometers (10.9 million square
miles), an area larger than the continent
of North America. Throughout October,
the hole remained large and set many
area daily records. Unusually cold
temperature and weak dynamics in the
Antarctic stratosphere this year resulted
in this larger ozone hole. In comparison,
last year the ozone hole peaked at 24.1
million square kilometers (9.3 million
square miles) on Sept. 11, 2014.
Compared to the 1991-2014 period, the
2015 ozone hole average area was the
fourth largest.
11. 5 ways to prevent ozone depletion
1. Limit private vehicle driving
A very easy way to control ozone depletion would be to limit or reduce the amount of driving as vehicular
emissions eventually result in smog which is a culprit in the deterioration of the ozone layer. Car pooling,
taking public transport, walking, using a bicycle would limit the usage of individual transportation. It would be
a great option to switch to cars/vehicles that have a hybrid or electric zero-emission engine.
2. Use eco-friendly household cleaning products
Usage of eco-friendly and natural cleaning products for household chores is a great way to prevent ozone
depletion. This is because many of these cleaning agents contain toxic chemicals that interfere with the ozone
layer. A lot of supermarkets and health stores sell cleaning products that are toxic-free and made out of
natural ingredients.
3. Avoid using pesticides
Pesticides may be an easy solution for getting rid of weed, but are harmful for the ozone layer. The best
solution for this would be to try using natural remedies, rather than heading out for pesticides. You can
perhaps try to weed manually or mow your garden consistently so as to avoid weed-growth.
4. Developing stringent regulations for rocket launches
The world is progressing in scientific discoveries by leaps and bounds. A lot of rocket launches are happening
the world over without consideration of the fact that it can damage the ozone layer if it is not regulated soon. A
study shows that the harm caused by rocket launches would outpace the harm caused due to CFCs. At present,
the global rocket launches do not contribute hugely to ozone layer depletion, but over the course of time, due
to the advancement of the space industry, it will become a major contributor to ozone depletion. All types of
rocket engines result in combustion by products that are ozone-destroying compounds that are expelled
directly in the middle and upper stratosphere layer – near the ozone layer.
5. Banning the use of dangerous nitrous oxide
Due to the worldwide alarm caused by a study in the late 70s about the alarming rate at which the ozone was
being depleted, nations around the globe got together and formed the Montreal Protocol in the year 1989 with
a strong aim to stop the usage of CFCs. However, the protocol did not include nitrous oxide which is the most
fatal chemical that can destroy the ozone layer and is still in use. Governments across the world should take a
strong stand for banning the use of this harmful compound to save the ozone layer.
