| 释义 |
Definition of Dobson unit in English: Dobson unit(also DU) noun A unit of measurement for the total amount of ozone in the atmosphere above a point on the earth's surface, one Dobson unit being equivalent to a layer of pure ozone 0.01 mm thick at standard temperature and pressure. Example sentencesExamples - This ratio changed by less than 1% as column ozone varied by 50 Dobson units, about 300 DU, so for subsequent calculations we used only the ratios computed for the central ozone value.
- Ozone measurements from the first week of March already show a region over the North Atlantic with very low ozone levels (<250 Dobson units).
- Ground-based measurements of ozone for all 3 days were within 8 Dobson units.
- The ozone hole area is defined as the size of the region with total ozone below 220 Dobson units.
- The unit of measure is a Dobson unit, which is equivalent to 1 milli-centimetre atmosphere of column ozone.
Origin 1980s: from the name of G. M. B. Dobson (1889–1976), British meteorologist. Definition of Dobson unit in US English: Dobson unit(also DU) nounˈdäbsən ˌyo͞onit A unit of measurement for the total amount of ozone in the atmosphere above a point on the earth's surface, one Dobson unit being equivalent to a layer of pure ozone 0.01 mm thick at standard temperature and pressure. Example sentencesExamples - Ozone measurements from the first week of March already show a region over the North Atlantic with very low ozone levels (<250 Dobson units).
- The unit of measure is a Dobson unit, which is equivalent to 1 milli-centimetre atmosphere of column ozone.
- Ground-based measurements of ozone for all 3 days were within 8 Dobson units.
- The ozone hole area is defined as the size of the region with total ozone below 220 Dobson units.
- This ratio changed by less than 1% as column ozone varied by 50 Dobson units, about 300 DU, so for subsequent calculations we used only the ratios computed for the central ozone value.
Origin 1980s: from the name of G. M. B. Dobson (1889–1976), British meteorologist. |