Dobson unitn.

Brit.

/ˈdɒbsn ˌjuːnɪt/, U.S.

/ˈdɑbs(ə)n ˌjunət/

Origin: From a proper name, combined with an English element. Etymons: proper name Dobson , unit n.

Etymology: < the name of Gordon Dobson (1889–1975), British physicist and meteorologist, who built the first instrument to measure total ozone from the ground + unit n.

A unit of measurement of the total amount of a trace gas in the atmosphere above a point on the earth's surface, one Dobson unit being equivalent to a layer of pure gas 10 µm thick at a temperature of 0°C and a pressure of one standard atmosphere.Dobson units are used chiefly to measure the level of atmospheric ozone.

ΚΠ

1959 Arch. for Meteorol., Geophysics, & Bioclimatol. A. 11 244 We found good agreement (within one to three per cent) if the total amounts were not more than 10% above or 20% below the standard value (250.6 Dobson units).

2007 Sci. Amer. (U.K. ed.) Dec. 18/1 [An ozone] hole is defined as a thickness of ozone less than 220 Dobson units—or less than 2.2 millimeters thick if the ozone resided at sea level at 0 degrees Celsius.

This is a new entry (OED Third Edition, June 2020; most recently modified version published online March 2022).

单词	dobson unit
释义	Dobson unitn. Brit. /ˈdɒbsn ˌjuːnɪt/, U.S. /ˈdɑbs(ə)n ˌjunət/ Origin: From a proper name, combined with an English element. Etymons: proper name Dobson , unit n. Etymology: < the name of Gordon Dobson (1889–1975), British physicist and meteorologist, who built the first instrument to measure total ozone from the ground + unit n. A unit of measurement of the total amount of a trace gas in the atmosphere above a point on the earth's surface, one Dobson unit being equivalent to a layer of pure gas 10 µm thick at a temperature of 0°C and a pressure of one standard atmosphere.Dobson units are used chiefly to measure the level of atmospheric ozone. ΚΠ 1959 Arch. for Meteorol., Geophysics, & Bioclimatol. A. 11 244 We found good agreement (within one to three per cent) if the total amounts were not more than 10% above or 20% below the standard value (250.6 Dobson units). 2007 Sci. Amer. (U.K. ed.) Dec. 18/1 [An ozone] hole is defined as a thickness of ozone less than 220 Dobson units—or less than 2.2 millimeters thick if the ozone resided at sea level at 0 degrees Celsius. This is a new entry (OED Third Edition, June 2020; most recently modified version published online March 2022). < n.1959
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