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A study of the effect of haze upon Umkehr measurements
Author(s) -
Deluisi J. J.
Publication year - 1969
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709540312
Subject(s) - haze , zenith , solar zenith angle , atmospheric sciences , ozone , environmental science , significant difference , meteorology , physics , mathematics , optics , statistics
The effect of atmospheric haze upon Umkehr observations is calculated in two ways. First, observed Umkehr curves are compared with computed Umkehr curves reconstructed from simultaneous direct soundings of the vertical ozone distribution. The difference between the two curves gives the ‘experimental’ haze effect. In the second method, Umkehr curves are computed for model atmospheres with and without haze, the difference giving a ‘theoretical’ haze effect. When the two haze‐effect curves are normalized to zero for a solar zenith angle of 60°, both exhibit the same characteristics, viz., the ‘correction’ to be subtracted from an observed (with haze) curve is negative at all solar zenith angles, the correction reaches a maximum near 81°, and there is a second small reversal near 87–88°. Application of the derived haze corrections in the Umkehr evaluation procedure results in slightly higher ozone content at and just below the main maximum and slightly lower ozone content elsewhere.