Experiment Station Record, Volume 92, January-June, 1945 Page: 171
xiii, 1010 p. ; 24 cm.View a full description of this book.
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19451 AGRICULTURAL METEOROLOGY 171
Observation methods for reliable meteorological data, S. P. FERGUSSON
(Amer. Met. Soc. Bul., 25 (1944), No. 7, pp. 289-298, illus. 16).-This discussion
considers the effects of changes in exposure on wind and precipitation records, exposure
of thermometers and hygrometers, self-registering thermometers v. thermographs,
desirable improvements in thermometers, and hygrometry; temperature, dew
point, vapor pressure, and relative humidity; and barometry, recording instruments,
anemometry, ombroscope, improved pole-star recorder, state of the sky, and symbols
for clouds.
Weather trends indicated by degree-day study, R. LITrLE (Heating and Ventilating,
41 (1944), No. 4, pp. 63-66, illus. 7).
The effect of vertical motion on local temperature and pressure tendencies,
H. A. PANOFSKY (Amer. Met. Soc. BIt., 25 (1944), No. 7, pp. 271-275, illus. 2).
-It is often assumed that temperature tendencies aloft and differences in pressure
tendencies between fixed levels can be computed from analysis of pilot balloon observations
alone, the assumption involved being that horizontal advection is the principal
cause of local warming and cooling in the free atmosphere. This assumption is
here tested, with the tentative conclusion that the effect of vertical motion and
other factors on temperature and pressure tendencies is almost equally as large as
the effect of horizontal advection. Two methods of estimating vertical velocities
are suggested.
Horizontal convergence and its relation to condensation processes, S. M.
NEAMTAN (Amer. Met. Soc. Bul., 25 (1944), No. 6, pp. 223-229, illus. 2).-Frequent
references are found in meteorological literature to the idea that horizontal
convergence favors condensation, and from time to time the word "convergence"
appears in a forecast as an explanation of the existence of clouds, fog, or precipitation.
The author attempts to show that the explanation commonly given of the relation
between convergence and condensation is inadequate and presents data for establishing
the relation on a more rigorous basis.
Snow melting and evaporation, A. R. CROFT. (U. S. D. A.). (Science, 100
(1944), No. 2591, pp. 169-170).-Melting and evaporation of snow during the winter
and spring seasons on the high mountains and plateaus of the Intermountain region
are of considerable interest because they have a direct bearing on the timeliness,
rate, and amount of stream flow made available during the rest of the year for
irrigation, power, and other purposes. 'To augment the meager knowledge of these
phenomena, preliminary studies of snow melting and evaporation were conducted
at elevations of 8,700-10,000 ft. on a portion of the Wasatch Plateau in central
Utah during the snow-melting season of 1942; some of the results are here briefly
summarized.
Estudios acerca de la medida de Ia evaporacion [Studies on measurement of
evaporation], W. C. THORNTHWAITE (Rev. Soc. Estud. Astronk y Geofis. [Mexico],
2. ser., 4 (1944), No. 13, pp. 29-35).
Evaporation at Portland, Maine, R. L. DAY (Amer. Met. Soc. Bul., 25 (1944),
No. 6, pp. 254-255).-Data for 2 yr. are presented.
A method of measuring rainfall on windy slopes, G. L. HAYES (Mo. Weather
Rev. [U. S.], 72 (1944), No. 5, pp. 111-114, illus. 2).-Conventional methods have
proved inadequate for measuring rainfall on wind-swept mountain slopes, but a high
degree of accuracy was found through use of sloped-orifice gages in pit exposure.
It is believed that numerous rainfall measurements now made by the older technic
could be made much more accurately by the methods here described. For example,
in the selected storms considered during this study the conventionally installed gage
at the windy 5,500-ft. south-slope station caught as little as 50 percent of the catch
of the sloped-orifice pit-exposed gage; "measurements under such conditions by conventional
installations can scarcely be sound aids to fire-control management."
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5064/m1/184/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.