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- Dobson_unit abstract "The Dobson unit (DU) is a unit of measurement of the columnar density of a trace gas in the Earth's atmosphere. It originated, and continues to be widely used, as a measure of total-column ozone, which is dominated by ozone in the stratospheric ozone layer. One Dobson unit refers to a layer of gas that would be 10 µm thick under standard temperature and pressure, sometimes referred to as a 'milli-atmo-centimeter.' For example, 300 DU of ozone brought down to the surface of the Earth at 0 °C would occupy a layer only 3 mm thick. One DU is 2.69×1016 ozone molecules per square centimetre, or 2.69×1020 per square metre.This is 0.4462 millimoles of ozone per square metre.A baseline value of 220 DU is chosen as the starting point for an ozone hole 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.In addition, Dobson units are often used to describe total column densities of Sulfur Dioxide, which occurs in the atmosphere in small amounts due to the combustion of fossil fuels, from biological processes releasing dimethyl sulfide, or by natural combustion such as forest fires. Large amounts of sulfur dioxide may be released into the atmosphere as well by volcanic eruptions. The Dobson unit is used to describe total column amounts of sulfur dioxide due to the fact that it appeared in the early days of ozone remote sensing on ultraviolet satellite instruments (such as TOMS).The Dobson unit is named after Gordon Dobson, who was a researcher at the University of Oxford. In the 1920s, he built the first instrument to measure total ozone from the ground, now called the Dobson ozone spectrophotometer.".
- Dobson_unit wikiPageID "78439".
- Dobson_unit wikiPageRevisionID "601456799".
- Dobson_unit hasPhotoCollection Dobson_unit.
- Dobson_unit subject Category:Atmospheric_chemistry.
- Dobson_unit subject Category:Ozone.
- Dobson_unit subject Category:Units_of_measurement.
- Dobson_unit type Abstraction100002137.
- Dobson_unit type DefiniteQuantity113576101.
- Dobson_unit type Measure100033615.
- Dobson_unit type UnitOfMeasurement113583724.
- Dobson_unit type UnitsOfMeasure.
- Dobson_unit comment "The Dobson unit (DU) is a unit of measurement of the columnar density of a trace gas in the Earth's atmosphere. It originated, and continues to be widely used, as a measure of total-column ozone, which is dominated by ozone in the stratospheric ozone layer.".
- Dobson_unit label "Dobson unit".
- Dobson_unit label "Dobson-Einheit".
- Dobson_unit label "Jednostka Dobsona".
- Dobson_unit label "Unidad Dobson".
- Dobson_unit label "Unidade Dobson".
- Dobson_unit label "Unité Dobson".
- Dobson_unit label "دوبسون".
- Dobson_unit label "ドブソン単位".
- Dobson_unit label "多布森单位".
- Dobson_unit sameAs Dobsonova_jednotka.
- Dobson_unit sameAs Dobson-Einheit.
- Dobson_unit sameAs Unidad_Dobson.
- Dobson_unit sameAs Unité_Dobson.
- Dobson_unit sameAs ドブソン単位.
- Dobson_unit sameAs Jednostka_Dobsona.
- Dobson_unit sameAs Unidade_Dobson.
- Dobson_unit sameAs m.0kh06.
- Dobson_unit sameAs Q740585.
- Dobson_unit sameAs Q740585.
- Dobson_unit sameAs Dobson_unit.
- Dobson_unit wasDerivedFrom Dobson_unit?oldid=601456799.
- Dobson_unit isPrimaryTopicOf Dobson_unit.