Question

hey frndz
our NASA saying tht ozone layer is becoming thinner now a days so ri8 an essay on (why ozone layer layer becomjng thi now a days)

Answer 1

hey

View the latest status of the ozone layer over the Antarctic, with a focus on the ozone hole. Satellite instruments monitor the ozone layer, and we use their data to create the images that depict the amount of ozone.

Click any map image to bring up a new page with a high-resolution image.

Ozone Movies

Watch a movie of the daily progression through a season or the annual progression of the means for a month. A table of all ozone movies are available in ourmultimedia section.

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Data sources

NASA TOMS

NASA/NOAA Nimbus-7

NASA METEOR-3

NASA Earth Probe TOMS

Aura OMI (KNMI | NASA) OMTO3d (Global Ozone Data)

Suomi NPP OMPS NMTO3-L3-DAILY

NASA GMAO

MERRA

MERRA-2

GEOS FP

ESA GOME

SBUV/2

NASA Nimbus-4, Nimbus-7

NOAA-9, NOAA-11, NOAA-14, NOAA-16

NASA JPL MLS

UARS

Aura

NOAA South Pole Balloon Sondes

Ozone facts

What is ozone?

Ozone is a colorless gas. Chemically, ozone is very active; it reacts readily with a great many other substances. Near the Earth’s surface, those reactions cause rubber to crack, hurt plant life, and damage people’s lung tissues. But ozone also absorbs harmful components of sunlight, known as “ultraviolet B”, or “UV-B”. High above the surface, above even the weather systems, a tenuous layer of ozone gas absorbs UV-B, protecting living things below.

What is a Dobson Unit?

The Dobson Unit (DU) is the unit of measure for total ozone. If you were to take all the ozone in a column of air stretching from the surface of the earth to space, and bring all that ozone to standard temperature (0 °Celsius) and pressure (1013.25 millibars, or one atmosphere, or “atm”), the column would be about 0.3 centimeters thick. Thus, the total ozone would be 0.3 atm-cm. To make the units easier to work with, the “Dobson Unit” is defined to be 0.001 atm-cm. Our 0.3 atm-cm would be 300 DU.

What is the ozone hole?

Each year for the past few decades during the Southern Hemisphere spring, chemical reactions involving chlorine and bromine cause ozone in the southern polar region to be destroyed rapidly and severely. This depleted region is known as the “ozone hole”. The area of the ozone hole is determined from a map of total column ozone. It is calculated from the area on the Earth that is enclosed by a line with a constant value of 220 Dobson Units. The value of 220 Dobson Units is chosen since total ozone values of less than 220 Dobson Units were not found in the historic observations over Antarctica prior to 1979. Also, from direct measurements over Antarctica, a column ozone level of less than 220 Dobson Units is a result of the ozone loss from chlorine and bromine compounds.

Answer 2

The various action done by human as excessive release of chlorine and bromine from man-made compounds such as chlorofluorocarbons  is forming a hole in the ozone layer thus making it thinner.

HOPE IT HELPS