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Airmass a.k.a. Air mass: In astronomy, air mass is the optical path length through Earth’s atmosphere for light from a celestial source. As it passes through the atmosphere, light is attenuated by scattering and absorption; the more atmosphere through which it passes, the greater the attenuation. Consequently, celestial bodies at the horizon appear less bright than when at the zenith. The attenuation, known as atmospheric extinction, is described quantitatively by the Beer–Lambert–Bouguer law.

Printed dictionaries and other books with definitions for Airmass

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Google previewGPU PRO 3 (2012)

Advanced Rendering Techniques by Wolfgang Engel

The airmass is an integral of the air density ρ(t) along the path: T = exp (−βm), ∫. Figure 2.1. Atmospheric scattering 101. See the text for an explanation of the symbols. density to a reference density ρ0 at reference altitude R. 106 II Rendering.

Google previewExtreme Weather and Climate (2016)

Earth sciences, Earth sciences by CTI Reviews

Convective instability: In meteorology, convective instability or stability of an airmass refers to its ability to resist vertical motion. A stable atmosphere makes vertical movement difficult, and small vertical disturbances dampen out and disappear.

Google previewEncyclopedia of World Climatology (2008)

by John E. Oliver

Airmass climatology is again a fertile ground for discussion and research. An airmass is a large body of air with relatively uniform temperature, humidity, and lapse rate characteristics across its horizontal extent. Especially in the midlatitudes, ...

Google previewBlackie’s Dictionary of Geography (2000)

by Blackie

front A front is an airmass boundary. It divides air of different properties, e.g. warm from cold. frontal depression Afrontal depression is a low pressure centre with two frontal surfaces, a cold frontal ...

Google previewMarine Affairs Dictionary (2004)

Terms, Concepts, Laws, Court Cases, and International Conventions and Agreements by Niels West

CHINOOK: Warm dry wind caused by the adiabatic warming of an airmass as it ...

Google previewA Dictionary of Weather (2008)

by Storm Dunlop

agglomeration aggregation Agulhas Current air air frost airglow air mass airmass analysis airmass climatology airmass thunderstorm air meter Aitken nucleus Alaska Current albedo Aleutian Current Aleutian low Alexander's dark band ...

Google previewPilot's Encyclopedia of Aeronautical Knowledge (2013)

Federal Aviation Administration by Federal Aviation Administration Federal Aviation Administration

An airmass passing over a warmer surface will be warmed from below, and convective currents form, causing the air to rise. This creates an unstable air mass with good surface visibility. Moist, unstable air causes cumulus clouds ...

Google previewInstant encyclopaedia of geography (1993)

by Shatrughna Prasad Sinha

airmass is replaced by another, temperature and humidity characteristics change. For example, the Mississippi River valley is typically dominated by warm, moist maritime tropical (mT) air from the Gulf of Mexico in summer. There is ample ...

Google previewThe Cambridge Encyclopedia of Hunters and Gatherers (1999)

by Richard B. Lee, Richard Heywood Daly

Ecological setting and population The extreme winter climate of the region ( shaped by the Arctic airmass) limited traders' winter mobility. The Temperate airmass, which creates an intense growing season from June to September, allowed ...

Google previewBlackie’s Dictionary of Astronomy

by Blackie

Airgun Airmass An artificial source of vibration used for submarine exploration. Path traversed by starlight before it reaches the detector. Airy George Sir George Bidell Airy served as the director of Greenwich Observatory of England from ...

Google previewA Dictionary of Earth Sciences (1976)

by S.E. Stiegeler

Sometimes as the depression moves eastwards along the occlusion, the line of airmass contrast to the north of the depression swings anticlockwise giving a further period of rain. This is known as a back-bent occlusion. Ocean ocean.

Google previewDictionary Of Environment (2008)

by Kulwant Rai Gupta, Ashish Kumar Gupta & Suriti Gupta

Airmass. A widespread body of in the atmosphere that gains certain meteorological or polluted characteristics while set in one location.

Google previewA Dictionary of Geology and Earth Sciences (2013)

by Michael Allaby

air mass (airmass) Large body of air (sometimes of oceanic or continental proportions) identified primarily by an approximately constant wet-bulb-potential ...

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Airmass Meaning

Video shows what airmass means. a widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated ...

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Scrabble value of A1I1R1M3A1S1S1

The value of this 7-letter word is 9 points, but it's not an accepted word in the Official Scrabble Players Dictionary.

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