2011年7月22日 · What is a Dobson Unit? The Dobson Unit is the most common unit for measuring ozone concentration. One Dobson Unit is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeters thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere (the air pressure at the surface of the Earth).

The Dobson unit (DU) is a unit of measurement of the amount of a trace gas in a vertical column through the Earth's atmosphere. It originated by, and continues to be primarily used in respect to, the study of atmospheric ozone, whose total column amount, usually termed "total ozone", and sometimes "column abundance", is dominated by the high ...

Ozone is formed from dioxygen by the action of ultraviolet (UV) light and electrical discharges within the Earth's atmosphere. It is present in very low concentrations throughout the atmosphere, with its highest concentration high in the ozone layer of the stratosphere, which absorbs most of the Sun 's ultraviolet (UV) radiation.

2 天之前 · 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.

The instrument was a landmark in ozone science. It is still the backbone of the Global Ozone Observing System and is continuously in use today at almost 100 observatories around the world. Amounts of ozone are regularly reported in thickness of the total column ozone, commonly known as Dobson Units (see blue box above).

What is the Dobson Unit (DU)? The concentration of a certain trace gas, for example ozone and SO 2, in a column of air in the earth's atmosphere is often given in Dobson Units. The "Dobson Unit" is named after professor G.M.B. Dobson (1889 - 1976), who has from the 1920s onwards done research on the ozone layer.

A Dobson unit represents the thickness of an atmospheric gas if it could be compressed to ground temperature and pressure. If we could magically isolate all the ozone molecules in the atmosphere, and take only these molecules and bring them to ground pressure and temperature, then a 1 Dobson unit (DU) layer of gas would occupy a layer only one ...

Ozone layer thickness is expressed in terms of Dobson units, which measure what its physical thickness would be if compressed in the Earth's atmosphere. In those terms, it's very thin indeed. A normal range is 300 to 500 Dobson units, which translates to an eighth of an inch-basically two stacked pennies.

Most of the ozone in the atmosphere is in the stratosphere of the atmosphere, with about 8% in the lower troposphere. As mentioned there, the ozone is formed due to photo reaction. The ozone level is measured in Dobson Unit (DU), named after G.M.B. Dobson, who investigated the ozone between 1920 and 1960.

The Dobson unit (DU) is a unit of measurement of atmospheric ozone, specifically ozone in the stratospheric ozone layer. One Dobson unit refers to a layer of ozone that would be 10 µm thick under standard temperature and pressure. [1]