الإنجليزية - الإنجليزية
تعريف airmass في الإنجليزية الإنجليزية القاموس.
- Meteorology. a widespread body of air, the properties of which can be identified as: (a) having been established while that air was situated over a particular region of the earth's surface (airmass source region) and (b) undergoing specific modifications while in transit away from the source region. An air mass is often defined as a widespread body of air that is approximately homogeneous in its horizontal extent, particularly with reference to temperature and moisture distribution; in addition, the vertical temperature and moisture variations are approximately the same over its horizontal extent
- the relative path length of the direct solar beam radiance through the atmosphere When the sun is directly above a sea-level location the path length is defined as airmass 1 (AM 1 0) AM 1 0 is not synonymous with solar noon because the sun is usually not directly overhead at solar noon in most seasons and locations When the angle of the sun from zenith (directly overhead) increases, the airmass increases approximately by the secant of the zenith angle A better calculation (Kasten, F and A T Young (1989) Revised optical air mass tables and approximation formula Applied Optics 28 (22), 4735-4738 ) follows
- A widespread body of the atmosphere that gains certain meteorological or polluted characteristics while set in one location The characteristics can change as it moves away (Source: Carbon Dioxide Information Analysis Center, 1990)
- A widespread body of in the atmosphere that gains certain meteorological or polluted characteristics while set in one location The characteristics can change as it moves away
- An extensive body of air throughout which the horizontal temperature and moisture characteristics are similar
- Meteorology. a widespread body of air, the properties of which can be identified as
- airmass source region
- An extensive area of the earth's surface over which bodies of air frequently remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface. Air so modified becomes identifiable as a distinct air mass. See Airmass