Experiment Station Record, Volume 92, January-June, 1945 Page: 13
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19451 AGRICULTURAL METEOROLOGY 13
in general a relation composed of terms varying with time as exp(-t/to), in which
to is a function of the effective porosity, the thickness, and the transmission constant
of the aquifer. This exponential curve may be approximated by a parabola
which is used to determine values of 'effective average rate of precipitation' from
published records of annual or monthly precipitation. By the 'effective average
rate of precipitation' at any time is meant that rate of precipitation which, had it
been maintained uninterruptedly throughout the past, would have produced the same
water-table profile as actually existed at that particular time. It is demonstrated
that the effective average rate of precipitation may be determined also simply by
cumulating departures from progressive averages of precipitation, multiplying the
values thus determined by a known rational coefficient, and adding the appropriate
initial value of effective average precipitation." Records of rainfall at the Battery
in New York City and at Setauket, L. I., are analyzed by the procedure outlined.
Precipitation and stream flow, C. S. JARVIS (Sci. Mo., 59 (1944), No. 2, pp. 96100).-The
general discussion presented revolves around the Mississippi Valley rainfall
and runoff, variability of discharge, comparison of outstanding river systems,
the value of fragmentary,data, mean annual precipitation and evaporation over the
globe, storage losses, and the rivers of Greenland.
On the measurement and frequency of traces of precipitation, H. NEUBERGER.
(Pa. State Col.). (Amer. Met. Soc. Bul., 25 (1944), No. 5, pp. 183-188, illus. 3).According
to international definition, a precipitation day is one on which precipitation
falls in measurable quantity, the lower limit being 0.01 in. in the United States,
Canada, and Newfoundland and 0.1 mm. in most other countries including Great
Britain. All quantities not reaching these limits are termed "traces" and are
omitted from most climatic summaries. It seems, however, that for comparative
climatological studies, for agriculture, and to a certain extent for war climatological
and other purposes the knowledge of the frequency of precipitation below the
arbitrary margin may be of value. For the purpose of recording traces and the
time of beginning and ending of precipitation as well as the type-rain, snow, or
drizzle-a simple apparatus has been in use since December 1941; in this device
the falling precipitation imprints itself on the smoked surface of a paper belt
slowly moving under a slot in the cover by a synchronous motor. Another model
automatically exposes a smoked glass or cardboard plate every hour. Detailed
results and evaluation of the use of such equipment are presented.
Notes on the gradient wind in low latitudes, W. J. GIBBS (Linn. Soc. N. S.
Wales, Proc., 67 (1942), pt. 3-4, pp. 153-155, illus. 2).-It is believed apparent from
the data presented that in latitudes less than 10, the wind direction tends to a
direction normal to the isobars from high to low pressure for straight or curved
Cold-front passages during persistent fog over the Maritime Provinces in
spring, R. W. LONGLEY (Amer. Met. Soc. Bul., 25 (1944), No. 4, pp. 143-148, illus.
5).-This paper describes the effect of the rapid cooling that may occur in a current
of warm air moving over the coastal waters about the eastern Maritime Provinces
Mountain climates of the western United States, F. S. BAKER. (Univ. Calif.).
(Ecol. Monog., 14 (1944), No. 2, pp. 223-254, illus. 21).-This paper aims to summarize
the present published information on the climate of the western mountain
ranges of the United States so that one may easily read the essential climatic data
for specific elevations-particularly those features held to affect plant-distribution.
The general characteristics of mountain climates are discussed prior to the presentation
of the detailed information which includes charts and graphs. Appendixes
give computations of the mean temperature in months other than January and July
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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.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/26/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.