Figure 12. Median temperature difference and geometric standard deviation of temperature difference along the path PWA

Figure 11. Mean elevation structure of surface air temperature, stratified by snow cover, when inversion was apparent along PWA

Figure 13. Eighty-fourth percentile of temperature difference, and frequency of lesser temperature with respect to P, along the path PWA

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III

Projected Distance (km)

Figure 12. Median temperature difference and geometric standard deviation of temperature

difference along the path PWA. An exaggerated topographic cross section shows the slope in

the vicinity of each measuring point.

ference and GSD occurs at W. The inflections re-

An exaggerated elevation cross section along

verse under inversion. The largest absolute tem-

the observation path PWA of Figure 9 is shown

perature difference occurs at A, the apex of

in Figures 12 and 13. The distance between mea-

observations, under both lapse and inversion.

suring points has been conserved in the elevation

The 84th percentile of temperature difference,

projection of Figures 12 and 13. The coordinated

with respect to P, is shown in Figure 13. The

designators may be used to identify the points on

temperature differences shown are again the ab-

the figures, the maps, or in Parts I and III. Rhumb

solute difference in temperature with respect to

line distances between nonadjacent observation

that at the bridge P, as in the temperature differ-

points are best estimated from Figure 9.

ences along the river shown in Part I. The fre-

The median value of the absolute temperature

quency of lesser temperature at the point, with

difference, with respect to the temperature ob-

served at bridge P, at observation points along P

respect to P (i.e., the fraction of times that it is

colder at the point than at the bottom of the val-

WA, is plotted for lapse and inversion conditions

ley) is also shown for lapse and inversion. The

in Figure 12. The geometric standard deviation

temperature at A is not uniquely lesser than at P

(GSD) of the temperature differences are also plot-

under lapse conditions, as we have stratified our

ted. Note that the scales of GSD differ; systemati-

data on the temperature difference in the layer

cally greater GSD occurs with inversion structure.

WA. Under inversion conditions the air tempera-

The median temperature difference with respect

to P increases with elevation as expected under

ture at elevations near that of W are frequently

lapse, but an inflection in both temperature dif-

less than that at P, and the frequency of lesser

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