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	Dobson unit - Education - Information - Educational Resources - Encyclopedia - Music
		One Dobson unit refers to a layer of ozone that would be 0.01 mm thick under standard temperature and pressure.
		For example, 300 Dobson units of ozone brought down to the surface of the Earth at 0 degrees C would occupy a layer only 3 mm thick.
		Gordon Dobson was a researcher at the University of Oxford who, in the 1920s, built the first instrument (now called the Dobson meter) to measure total ozone from the ground.
	www.music.us /education/D/Dobson-unit.htm (318 words)

	Climate Glossary - Ozone
		The Dobson spectrophotometers are used to check the results from the satellites, to extend existing long records of ozone monitoring (up to almost 40 years), and to provide a near simultaneous reference measurement for vertical profile measurements using ozonesondes.
		Dobson spectrophotometers can also be used the derive vertical ozone profiles, the results of which do not have the detail of the ozonesonde.
		The CSIRO began ozone measurements in Melbourne in 1956 in cooperation with the Bureau of Meteorology and in 1982 total responsibility passed to the Bureau.
	www.bom.gov.au /climate/glossary/ozone.shtml (1260 words)

	Units: D
		The metric unit of yarn density is the tex; 1 denier equals 1/9 tex or 10/9 decitex.
		Actually there are two units: the horizontal dialog unit equals 1/4 the average width of the font being used, and the vertical dialog unit equals 1/8 the average height of the font.
		One Dobson unit represents the amount of atmospheric ozone that would form a uniform layer 0.01 millimeter (10 micrometers) thick at standard temperature (0 °C) and pressure (1 atmosphere or 1013.25 millibars).
	www.unc.edu /~rowlett/units/dictD.html (8674 words)

	Dobson unit - Glasgledius (Site not responding. Last check: )
		One Dobson unit refers to a layer of ozone that would be 0.001 cm thick under conditions of standard temperature (0 °C) and pressure (the average pressure at the surface of the Earth).
		For example, 300 Dobson units of ozone brought down to the surface of the Earth at 0 degree C would occupy a layer only 0.3 cm thick in a column.
		Dobson was a researcher at Oxford University who, in the 1920s, built the first instrument (now called the Dobson meter) to measure total ozone from the ground.
	www.glasglow.com /E2/do/Dobson_unit.html (114 words)

	Dobson unit (Site not responding. Last check: )
		One Dobson unit refers to a layer of ozone that would be 10 micrometress thick under standard temperature and pressure.
		For example, 300 Dobson units of ozone brought down to the surface of the Earth at 0 degrees celsius would occupy a layer only 3 mm thick.
		Gordon Dobson was a researcher at the University of Oxford, who, in the 1920s, built the first instrument (now called the Dobson Ozone Spectrophotometer) to measure total ozone from the ground.
	www.kiwipedia.com /dobson-unit.html (123 words)

	* Dobson unit - (Environment): Definition
		One Dobson unit refers to a layer of ozone that would be 0.
		Dobson Unit (DU) The standard way to express ozone amounts in the atmosphere.
		The "Dobson unit", a convenient measure of the total amount of ozone in a column overhead, is named in his honor.
	en.mimi.hu /environment/dobson_unit.html (138 words)

	Dobson unit (Site not responding. Last check: )
		Dobson units (DU) are the standard way to express ozone amounts inthe atmosphere.
		For example, 300 Dobson units of ozone brought down to the surface of the Earthat 0 degree C would occupy a layer only 0.3 cm thick in a column.
		Gordon Dobson was a researcher at Oxford University who, in the 1920s, built the firstinstrument (now called the Dobson meter) to measure total ozone from the ground.
	www.therfcc.org /dobson-unit-124794.html (128 words)

	Measuring Ozone Depletion
		The Dobson Unit is named after the atmospheric ozone pioneer G.M.B. Dobson who carried out the earliest studies on ozone in the atmosphere from the 1920s to the 1970s.
		A Dobson Unit measures the total amount of ozone in an overhead column of the atmosphere.
		Dobson Units are measured by how thick the layer of ozone would be if it were compressed into one layer at 0 degrees Celsius and with a pressure of one atmosphere above it.
	www.enviropedia.org.uk /Ozone_Depletion/Measuring.php (185 words)

	UK Stratospheric Ozone Measurements
		Dobson Unit- 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.
		To make the units easier to work with, the "Dobson Unit" is defined to be 0.001 atm-cm.
	www.airquality.co.uk /archive/ozone/ozone_a_to_z.php (829 words)

	Measuring Ozone Depletion
		The Dobson Unit is named after the atmospheric ozone pioneer G.M.B. Dobson who carried out the earliest studies on ozone in the atmosphere from the 1920s to the 1970s.
		A Dobson Unit measures the total amount of ozone in an overhead column of the atmosphere.
		Dobson Units are measured by how thick the layer of ozone would be if it were compressed into one layer at 0 degrees Celsius and with a pressure of one atmosphere above it.
	www.ace.mmu.ac.uk /eae/Ozone_Depletion/Older/Measuring.html (185 words)

	Dobson Units (Site not responding. Last check: )
		Total ozone is typically measured in Dobson units, a unit of measure with special physical significance that honors a pioneering scientist.
		Dobson of Oxford University developed a technique to accurately measure the abundance of ozone using a spectrometer that quantifies the amount of ultraviolet radiation reaching the surface.
		Ground-based Dobson spectrometers are still in use, around the world, to document the abundance of stratospheric ozone.
	remus.jpl.nasa.gov /pasadena/dobson_units.htm (313 words)

	Units for Atmospheric Chemistry: Abstract (Site not responding. Last check: )
		This document reviews units of quantities pertinent to atmospheric chemistry, with particular emphasis on quantities used to express abundances of substances (mixing ratios, concentrations), reaction rates, and exchange rates between compartments (emission and deposition rates and fluxes, etc.) and presents recommendations for units for these quantities.
		The table presents SI units for these quantities as well as common units convenient for routine use, which are derived from SI units by use of prefixes for decimal multiples and submultiples.
		As SI units are increasingly employed in the broader atmospheric and environmental research community, as well as in laboratory research, it is hoped that the increased use of these units by scientists in all these disciplines will foster cross-disciplinary understanding and communication.
	www.ecd.bnl.gov /steve/abstracts/Units.html (622 words)

	TEMIS -- What is the Dobson Unit (DU)?
		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.
		The "Dobson unit" indicates how much ozone there is in the air above a certain point on Earth.
		By the way, the Dobson Unit is sometimes also used for other trace gases in the atmosphere, such as methane (CH4) and carbon monoxide (CO)
	www.temis.nl /general/dobsonunit.html (275 words)

	The Ozone Hole-Dobson Unit
		Dobson inferred correctly that the cause of the warm stratosphere was heating by the absorption of ultraviolet solar radiation by ozone, and he set out to make measurements of the amounts and their variability.
		Dobson's first spectrograph employed a Fabry prism, an optical wedge consisting of gelatine and carbon fl between quartz plates designed by T. Merton of the Clarendon Laboratory, and a filter consisting of a mixture of chlorine and bromine vapour to cut out unwanted solar radiation at longer wavelengths.
		The Dobson spectrometer measures the intensity of solar UV radiation.
	www.theozonehole.com /dobsonunit.htm (766 words)

	The Ozone Hole Tour : The Dobson Unit
		The unit is named after G.M.B. Dobson, one of the first scientists to investigate atmospheric ozone (~1920 - 1960).
		He designed the 'Dobson Spectrometer' - the standard instrument used to measure ozone from the ground.
		The Dobson spectrometer measures the intensity of solar UV radiation at four wavelengths, two of which are absorbed by ozone and two of which are not.
	www.atm.ch.cam.ac.uk /tour/dobson.html (180 words)

	Looking at Earth From Space - d
		A unit used to measure the volume of a sound, equal to ten times the common logarithm of the ratio of the intensity of the sound to the intensity of an arbitrarily chosen standard sound.
		One Dobson unit refers to a layer of ozone that would be 0.001 cm thick under conditions of standard temperature (0 degrees C} and pressure (the average pressure at the surface of the Earth).
		For example, 300 Dobson units of ozone brought down to the surface of the Earth at 0 degrees C would occupy a layer only 0.3 cm thick in a column.
	www.grc.nasa.gov /WWW/K-12/TRC/laefs/laefs_d.html (1284 words)

	G. M. B. Dobson - dobsonova jednotka \| životopis
		Dobson byl důvtipný experimentátor, který se většinu svého života věnoval studiu atmosférického ozónu.
		Dobson usoudil, že je stratosféra zahřívána pohlcováním ultrafialového slunečního záření.
		V roce 1924 Dobson sestavil svůj první přístroj na měření spektra (spektrometr).
	www.converter.cz /fyzici/dobson.htm (278 words)

	info: Dobson_unit (Site not responding. Last check: )
		A dobson unit is the most basic measure used in ozone research.
		The Dobson Unit is the most common unit for measuring...
		Ozone Hole Watch The Dobson Unit (DU) is the unit of measure for total ozone.
	www.napoli-pizza.net /Dobson_unit.html (293 words)

	AMS Glossary
		—A unit used in the measure of the column abundance of ozone in the atmosphere.
		One Dobson unit is the equivalent of 2.69 × 10
		Alternatively, 1 Dobson unit corresponds to a layer of ozone 10 μm thick, if the ozone were held at standard temperature and pressure (273 K, 1 atm pressure).
	amsglossary.allenpress.com /glossary/search?id=dobson-unit1 (79 words)

	DobsonUnit (Site not responding. Last check: )
		1 Dobson Unit (DU) is defined to be 0.01 mm thickness of pure ozone at STP (standard temperature and pressure).
		Ozone layer thickness is expressed in terms of Dobson units, which measures what its physical thickness would be if all the ozone in the atmosphere were purified and then compressed in the Earth's atmosphere to a pressure of normal sea level pressure (1-Atmosphere or 760 mmHg).
		For example, regions on an ozone map of the bright green color mean that ozone values could be as low as 300 Dobson units and as high as 325 Dobson units.
	cs.clark.edu /~mac/Geol390/StratosphericOzone/Ozone/DobsonUnit.htm (181 words)

	-= KMI-IRM Ozone Pages =-
		From the knowledge of the absorption spectrum of ozone and the calibration of the instrument, the ozone content of the atmosphere is derived.
		The oldest type of ozone spectrophotometer is the Dobson instrument, which uses quartz prisms to select the wavelengths of the incoming light.
		One Dobson unit corresponds with a layer of 0.01 mm of ozone if all the ozone in the column were to be brought to standard conditions (i.e.
	www.meteo.be /ozon/instruments/spectrophotometers.php (458 words)

	[No title] (Site not responding. Last check: )
		In addition satellite measurements observed a low reading of 85 Dobson units of ozone on Oct. 8.
		That is down from a thickness of 300 Dobson units in July.
		A reading of 100 Dobson Units means that if all the ozone in the air above a point were brought down to sea-level pressure and cooled to freezing it would form a layer 1 centimeter thick.
	www.kgw.com /sharedcontent/dws/news/washington/stories/102006natozone.2cc3730.html (405 words)

	Dobson unit
		Imagine that all the ozone in a column reaching from an area on the Earth's surface to the top of the atmosphere were concentrated in a single layer of pure ozone at a temperature of 0°C and a pressure of 1 standard atmosphere.
		The thickness of that layer, measured in hundredths of a millimeter, would be the concentration of ozone expressed in Dobson Units.
		The Dobson unit is occasionally used to express concentrations of other atmospheric gases, such as methane.
	www.sizes.com /units/dobson_unit.htm (247 words)

	Envirocast® On-Line Feature of the Week
		The Dobson Unit describes how much ozone there would be in a column of the atmosphere if all the molecules were squeezed into a single layer.
		The average amount of ozone in the atmosphere is roughly 300 Dobson Units, equivalent to a layer 0.12 inches thick.
		Dobson Units take a column of air and describe how much ozone is in it.
	www.stormcenter.com /media/envirocast/archive/061004 (492 words)

	Dobson Unit (DU)
		Rond 1930 heeft hij de eerste "Dobson spectrophotometer" gebouwd, waarmee betrouwbare metingen aan de ozonlaag mogelijk werden.
		De "Dobson eenheid" geeft aan hoeveel ozon er in de lucht aanwezig is boven een bepaald punt op aarde.
		By the way, the Dobson Unit is sometimes also used for other trace gases in the atmosphere.
	www.knmi.nl /gome_fd/doc/dobsonunit.html (535 words)

	What is a Dobson Unit?
		unit is the most basic measure used in ozone research.
		If all the ozone in this column were to be compressed to stp (0 deg C and 1 atmosphere pressure) and spread out evenly over the area, it would form a slab approximately 3mm thick.
		1 Dobson Unit (DU) is defined to be 0.01 mm thickness at stp; the ozone layer over Labrador then is ~300 DU.
	jwocky.gsfc.nasa.gov /teacher/basics/dobson.html (200 words)

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