Frederick A. Hanser, Bach Sellers, and Daniel C. Briehl, "Ultraviolet spectrophotometer for measuring columnar atmospheric
ozone from aircraft," Appl. Opt. 17, 1649-1656 (1978)
An ultraviolet spectrophotometer (UVS) to measure downward solar fluxes from an
aircraft or other high altitude platform is described. The UVS uses an
ultraviolet diffuser to obtain large angular response with no aiming
requirement, a twelve-position filter wheel with narrow (2-nm) and broad (20-nm)
bandpass filters, and an ultraviolet photodiode. The columnar atmospheric ozone
above the UVS (aircraft) is calculated from the ratios of the measured
ultraviolet fluxes. Comparison with some Dobson station measurements gives
agreement to 2%. Some UVS measured ozone profiles over the Pacific Ocean
for November 1976 are shown to illustrate the instrument's
performance.
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ΔT is the approximate time lapse between the UVS
and Dobson measurements being compared. The listed results are averages
over Dobson data taken before and after the overflight.
This is the average of all valid UVS data at all altitudes for the
Aspendale overflights. Two sets of 11.9-km data raise the average
altitude to that listed.
The available Hobart data show significant time variations, being (GMT
h-min/total ozone atm-cm): 0057/0.328, 0205/0.294, 0301/0.286,
0510/0.319; the overflight time is about 0004 GMT. The first line uses
only the 0057 Hobart measurement, while the second line uses the average
of all Hobart data. The second line is used for comparison purposes.
The Macquarie data also show time variations: 1942/0.365, 2140/0.358,
0004/0.347, 0053/0.358; the overflight time is 0151 GMT. The comparison
is for the 0053 GMT Macquarie measurement and is almost identical to
that for the average of all Macquarie data, which is thus not
listed.
Only one Dobson measurement from Wellington is available, for about 2.5 h
after the overflight.
This is considered to be the best presently obtainable measure of the
agreement between UVS-derived total ozone and Dobson measured total
ozone.
ΔT is the approximate time lapse between the UVS
and Dobson measurements being compared. The listed results are averages
over Dobson data taken before and after the overflight.
This is the average of all valid UVS data at all altitudes for the
Aspendale overflights. Two sets of 11.9-km data raise the average
altitude to that listed.
The available Hobart data show significant time variations, being (GMT
h-min/total ozone atm-cm): 0057/0.328, 0205/0.294, 0301/0.286,
0510/0.319; the overflight time is about 0004 GMT. The first line uses
only the 0057 Hobart measurement, while the second line uses the average
of all Hobart data. The second line is used for comparison purposes.
The Macquarie data also show time variations: 1942/0.365, 2140/0.358,
0004/0.347, 0053/0.358; the overflight time is 0151 GMT. The comparison
is for the 0053 GMT Macquarie measurement and is almost identical to
that for the average of all Macquarie data, which is thus not
listed.
Only one Dobson measurement from Wellington is available, for about 2.5 h
after the overflight.
This is considered to be the best presently obtainable measure of the
agreement between UVS-derived total ozone and Dobson measured total
ozone.