By Guy P. Brasseur, Susan Solomon
The reader should be shocked to benefit that the observe "aeronomy" isn't present in a few of the average dictionaries of the English language (for examination ple. Webster's foreign dictionary). but the time period would seem to exist, as evidenced through the affiliations of the 2 authors of this quantity (Institut d'Aeronomie, Brussels, Belgium; Aeronomy Laboratory, nationwide Oceanic and Atmospheric management, Boulder, CO, USA). maybe a part of this obscu rity arises simply because aeronomy is a comparatively new and evolving box of exercise, with a background relationship again no farther than approximately 1940. The Chambers dic tionary of technological know-how and know-how offers the subsequent definition: "aeronomy (Meteor. ). The department of technology facing the ambience of the Earth and the opposite planets almost about their chemical com place, actual houses, relative motion,
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Extra info for Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere
Hz may be thought of as representative of the scale height of the atmosphere, which is generally not too far from 7 km as we have already seen. For an isothermal atmosphere where T = 239K, the log pressure and geometric altitudes are identical. Further, for the range of temperatures found in the middle atmosphere, Zp is roughly equal to the actual geometric altitude. In the following, we shall simply use z rather than zp to refer to the Jog pressure altitude. 22) We also assume that r ~ a. In spherical log pressure coordinates, the equations of motion then become: du u' v' .
15) where m is the molecular weight and k is Boltzmann's constant. H represents twice the distance through which atoms or molecules having the equipartition of translational energy, 1/2 kT, can rise in the vertical direction against the force of gravity (Campbell, 1977). This simple relationship can be used to characterize the vertical structure oC the atmosphere in a convenient form. 17b) p(z) ~ poexp [ - z - z and z- z ] n(z) ~ noexp [ - The atmospheric scale height is roughly 7 ± I km in the homosphere.
6. ure fields at 10 mb in the northern hemisphere. From O'Neill (1980). Aeronomy of the Middle Atmosphere 39 Holton, 1979). 6 presents typical observed temperature and geopotential height fields for summer and winter (the geopotential height will be defined in eqn. 21). Generally the local vector wind is directed approximately parallel to the contours of the geopotential height field. The summer temperature and geopotential height fields are nearly parallel to the latitude circles, and no substantial wave structure is apparent.
Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere by Guy P. Brasseur, Susan Solomon