Smithsonian miscellaneous collections . ° 70° 5° 6° 7° 8° 9° 10° 16 15 14 14 14 13 m. p. s,50 Where no value is inserted for v, the gradient corresponding tothe given value of v0 is above the maximum for the correspondingvalue of (p. To show the dependence on X, we take (pâ 30 and put v0 = 40meters per second for cyclonic motion, and v0 = meters per 120 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 second for anticyclonic motion. The following table gives thevalues of v for different latitudes in the three cases: ; 30° 40° 50° 60° 70° For v0 = 40 . ...v = 2
Smithsonian miscellaneous collections . ° 70° 5° 6° 7° 8° 9° 10° 16 15 14 14 14 13 m. p. s,50 Where no value is inserted for v, the gradient corresponding tothe given value of v0 is above the maximum for the correspondingvalue of (p. To show the dependence on X, we take (pâ 30 and put v0 = 40meters per second for cyclonic motion, and v0 = meters per 120 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 second for anticyclonic motion. The following table gives thevalues of v for different latitudes in the three cases: ; 30° 40° 50° 60° 70° For v0 = 40 . ...v = 21 23 24 25 26 Forz;0 = 10 . . .v â â â â 17 15 For v0 = 5 . . ...v = By the use of tables giving values of v0 for different values of x,T, B, and of v for different values of X, v0, <p, each wind observationat 1000 meters altitude was compared with the value deduced fromthe surface isobars. The temperature correction was not applied. The following table gives the result of the comparisons:. Berlin: January February March : April May June 6 July August September October November December 11. o Summer Winter Year 10. 2 The upper wind coincides in direction very nearly with the isobarsat the surface, and the wind velocity observed agrees well with thatcalculated from the pressure distribution. The differences are notgreater than possible errors of observation, except in spring. It is known that the upper wind always veers from the surfacewind, and the numbers in Column 7 show that in 1905 the veeringwas considerably greater in winter than in summer. If the effect of the earths surface were the same as if a frictionalforce opposed the motion, the relation between the wind and grad- WIND VELOCITY AND SURFACE PRESSURE GOLD 121 ient of pressure would be as above, except that the effective gradientwould be the maximum gradient multiplied by the cosine of a, theangle betwe
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