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This paper deals with a statistical study of atmospheric various air masses are presented, together with several situations showing changes in turbidity of the same air mass as it passes each station. Also conclusions are offered regarding an autumn-winter-spring variation in-atmospheric dust content. The Linke turbidity factor T is defined bv Linke (6) as the ratio of the aimospheric extinction coefficient 'to the molecular extinction coefficient.' Since atmospheric depletion of solar radiation is due not only to molecular scattering but also to dust scattering and absorption by water vapor, the Linlre factor is always greater than unity. It is defined mathematically as where I , is the solar constant corrected to actual solar distance; I is the total intensity of the direct sdar radiation ; m is the optical air mass computed from the solar altitude; and a, is the molecular scattering coefficient and is a function of m. Hence, by observing I and m, T may be easily computed. The function P(m) has been computed by Feussner and Dubois (2) and is tabulated on page 23 of the monograph by Haurwitz (4). The normal intensities of solar radiation for Lincoln, Madison, and Washington were taken directly from the observations published in the MONTHLY WEATHER Se tember because of lack of analyzed maps. The pu fl lished values are for integral values of m only and art: derived by the observer from interpolation and extrap-olation of the original intensities. For Blue Hill the original observations (not the values for integral optical air mass published in the MONTHLY WEATHER REVIEW) were used; the period covered is from December 1932, immediately after the solar radiation program a t Blue Hill was begun, to May 1933. The synoptic air masses present at the various stations were identified from the synoptic charts analyzed by the Meteorological Division of Massachusetta3 Institute of Technology. Since local conditions of smoke, dust, haze, and clouds may influence turbidity, a detailed description of the exposures of the various instruments is necessary. 1 Tmay be also defined ap m x h a t e l y 89 the number of clean dry atmospheres which would diminish the direct e & intensity by the game amount is does the single, moist, dlrty atmosphere. pyrheliometer is used; a description of the exposures a t these stations is quoted in part from Kimball (5) p. 26: A t Washington [3S056' N., 77'05' W., …

TURBIDITIES OF AMERICAN AIR MASSES AND CONCLUSIONS REGARDING THE SEASONAL VARIATION IN ATMOSPHERIC DUST CONTENT