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By Isaac Asimov

Lines the background of the medical discovery of "atmosphere" and its houses.

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2 mm channel image (Fig. 7B). 2 mm image as an irregular gray shade pattern consistent with the cloudiness below the 400 hPa level. 8 Vertical cross-section of relative humidity (%) from the ARPEGE NWP model along the lines (A) AA and (B) BB depicted in Fig. 7. • At the blue arrow in Fig. 1) and dry air above. 3 mm channels. The ability of each one of the two WV channels to reflect complex moisture patterns in a real troposphere depends on the specific moisture stratification as illustrated below.

That is also the reason why the dry air in the layer 600e700 hPa level below the position of the green arrow in Fig. 8B (less than 10% relative humidity) is not visible in Fig. 3 mm channel radiation from below is absorbed by the moist air above 600 hPa that lightens the image gray shades. 3 EFFECTS OF LAYERED MOISTURE ON THE RADIANCE Even when clouds are not a factor, and the air temperature decreases upward with an average lapse rate, moisture is often concentrated in layers (see also Weldon and Holmes, 1991; Santurette and Georgiev, 2005).

However, because of the low temperature the absolute humidity is low, and the threshold level will be quite low. In such cases, features at lower altitudes will be observed on the imagery. During winter, large temperature inversions are common in cold-air regimes, especially over continental areas, and these do cause exceptions to the topographic concept. Since the moisture may be present within a relatively deep layer of air with temperature warmer than the surface, the brightness temperature may be warmer than that of the surface.

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