INDEX 
(References to titles of articles appear in bold face.) 
A 
Absorbers, effect on effective terrestrial 
radiation, 39 
Absorbing layers, upper atmosphere, 
heights of, 271 
Absorption coefficients, 265 
as a function of pressure, 40 
oxygen, 275 
ozone, 275 
Absorption cross section, 265 
Absorption functions, 36 
Absorption laws, 34 
for diffuse radiation, 35 
for parallel radiation, 34 
Absorption of solar radiation, 19 
measurement, 50 
spectral evidence, upper atmosphere 
composition, 270 
Absorption spectrum, 264 
Actinograph, Robitzsch, 54 
Actinometer, Michelson, 53 
Actinometric equipment at meteoro- 
logical stations, 53 
instruments, 52 
Actinometric measurements, 50 
accuracy, 50 
atmosphere analysis, 50 
critique of routine, 55 
effect of absorption on solar radiation, 
effect of molecular scattering on solar 
radiation, 50 
effect of varying distance between sun 
and earth on solar radiation, 50 
heat exchange at earth’s surface, 50 
solar constant, 50 
special problems, 55 
Actinometrie observatory, 
equipment, 54 
Actinometric stations, 
equipment, 54 
third order, equipment, 55 
Actinometry, 50 
biological problems and, 52 
Actinon, source, 155 
Activation energy, 270 
Advective-adiabatic extrapolation, prog- 
nosis of relative hypsography 
by, 782 
pico e mmonels, barotropic models, 
4 
central, 
second order, 
dynamic forecasting and, 471 
Kibel’s method, 473 
Aerobiology, 1103 
atmosphere ag environment for or- 
ganisms, 1105 
biological factors, 1103 
counting, methods and problems, 1103 
exchange of organisms between earth 
and atmosphere, 1106 
identifying organisms, methods and 
problems, 1104 
locating sources, methods and prob- 
lems, 1104 
meteorological factors, 1106 
origin of molds, 1109 
sampling, methods and problems, 1103 
thermal convection, 1110 
transport of organisms, 1108 
Acvology. of extratropical disturbances, 
99 
Aerology of tropical storms, 902 
eee re, and applied climatology, 
and microclimatology, 998 
Air, albedo of pure dry, 25 
atmospheric, composition of, 3 
Air—continued 
earth electric current, 113 
effect on scintillation, 68 
electrical conductivity, 102 
ionization of, 102 
total oxidation, 1130 
tropical, properties, 881 
Air current) modifications, forecasting, 
9 
Air density distribution, 360 
Air density, from meteor deceleration, 
360 
seasonal variations, 360 
Air masses, Antarctic, 923 
Artic, 948 
in equatorial meteorology, 881 
modification, 973 
forecasting, 779 
use for description of climate, 968 
Air motion, effect on ozone, 283 
Air pressure, effect on downcoming 
radiation, 40 
Air transport, by slope winds, 666 
Aircraft, electrification of, flying through 
precipitation, 133 
meteorological instruments, 1223 
Aircraft icing, analysis of formation, 1190 
at low temperatures, 194 
availability of liquid water, 1190 
cloud-drop diameter, measurement, 
1198 
cloud-drop size, 1201 
concentration of liquid water in clouds, 
1199 
conditions for formation, 1192 
effect on airplane components, 1193 
forecasting, 793 
forecasting icing conditions, 1201 
icing conditions, physical characteris- 
tics, 1197 
intensity, 1198 
liquid-water concentration, measure- 
ment, 1198 
meteorological aspects, 1197 
meteorological conditions, 
needed, 1202 
operational aspects, 1190 
physical aspects, 1190 
physical characteristics of icing condi- 
tions, 1197 
research needed, 1195 
special cases, 1193 
water impingement, 1191 
Airglow, 269 
Airline eperatons; and instability lines, 
64 
research 
Airplane, thunderstorms and, 690 
Aitken dust counter, 165 
Aitken-nuclei, 183; see also Condensation 
nuclei 
destruction processes, 188 
effect of pressure changes on, 186 
form, 184 
formation in smoke, 186 
growth, 184 
horizontal distribution, 184 
mechanical sources, 187 
optical effects, 188 
physical state, 184 
size, relation to electrostatic charge, 
1 
vertical distribution, 184 
Albedo, 25 
of cloudless atmosphere, 25 
of dust, 26 
of earth’s surface, 27 
of planet Harth, 27 
1317 
Albedo—continued 
of pure dry air, 25 
of the Earth, 31 
of various cloud types, 26 
of various surfaces, 27 
of water vapor, 26 
total atmospheric, 26 
Alpine tree line, 953 
Alpine tundra, 953 
Alps, air circulation during daytime, 663 
Altimeter, 1226 
Altitude(s), effect on electrical con- 
ductivity of air, 104 
extreme, pressures at, 308 
temperatures at, 308 
Ammonia content of atmosphere, 7 
Ammonium ions, effect on condensation 
nuclei formation, 186 
Amorphous frost, 207 
Anafront, 771 
Angels, 1277 
Angstr6m compensation pyrheliometer, 
52 
Angstrom pyrgeometer, 55 
Antarctic, air exchange, 936 
air masses, 923 
anticyclone, 918 
atmosphere, exchange, 936 
oxygen content, 933 
atmospheric circulation, 917 
blizzards, 919 
circulation, 925 
prospects for study, 937 
cyclones, 922 
exploration, 917 
frontal zones, 922 
geography, 917 
glaciation, 934 
ice, recession, 934 
thickness, 933 
interior, summer winds, 921 
weather conditions, 921 
precipitation, 933 
pressure waves, 926 
characteristics, 926 
movement, 926 
theories, 927 
seasons, 920 
snow surface, altitude, 934 
soundings, 930 
storms, 924 
stratospheric warming, 931 
surges, 926 
temperatures, 929 
march of, 982 
summertime, 931 
wintertime, 930 
upper winds, 920 
water temperature, 932 
weather observation stations, 708, 918, 
937 
winds, 919 
Anticorona, 71 
Anticyclogenesis, 770 
Anticyclones, 621 
and forecasting, 626 
and summer showers, 626 
Antarctic, 918 
““back-door”’ cold fronts and, 627 
definition, 621 
degeneration, 778 
high level, formation, 612 
generation, 778 
Indian summer, 626 
motion, 625 
origin, 621 
