A progress report and data analyses from the December 1980 flight are presented. The following areas are covered: (1) computer analysis of the flight spectra to obtain phase corrected, normalized sums of spectra for retrieval of atmospheric profiles; (2) study of atmospheric HF, HCl, and H2O; (3) stratospheric H2O2 and HOCl; (4) laboratory spectroscopy of HOCl; and (5) design study of a new balloon gondola. The majority of the flight data were taken in the low background mode, i.e., one input to the spectrometer looking at the sky and the other looking at a LN2 temperature blackbody. An analysis of HF stratospheric measurements was undertaken in conjunction with the HF analysis. High quality spectra showing the HOCl q-branches under optically thin conditions were also obtained

Traub, W. A.

English

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N O T I C E 
 
THIS DOCUMENT HAS BEEN REPRODUCED FROM 
MICROFICHE. ALTHOUGH IT IS RECOGNIZED THAT 
CERTAIN PORTIONS ARE ILLEGIBLE, IT IS BEING RELEASED 
IN THE INTEREST OF MAKING AVAILABLE AS MUCH 
INFORMATION AS POSSIBLE 
https://ntrs.nasa.gov/search.jsp?R=19810016115 2020-03-21T13:57:36+00:00Z
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MBASuREMEX.T OF HO AND OTHER TRACE GASES IN THE STRATOSPHERE2
USING A HIGH RESOLUTION FAR-INFRARED SPECTROMETER AT 28 KK
GRANT NSG 5i15
Send annual Status Report NO -
For the period I Januaxy 1981 to 15 June 1981
Dr. Wesley A. Traub
Principal investigator
4UN 1"81
Rwivw
NASA Sn
ACCESj 
Dft 
M
May 1981
Prepared for
National AeronoUtics and Space Administration
Greenbelt, Maryland 20771
Smithsonian Institution
Astrophysical observatory
Cambridge, MA 02138
The
 =
smithsonian Astrophysical observatory
and the Harvard Coll4ge observatory
membersare ber6 of the
Center forter  Astrophysics
The NASA Technical Otticer for this grant is Edith 
I. Reed f Co&- 963
Laboratory for Planetary Atmospheres, Applications Directorate, Goddard
Space Flight Center, Greenbelt, Maryland 20771.
AL
MEASUREMENT OF HO  AND OTHER TRACE GASES IN THE STRATOSPHERE
USING A HIGH RESOLUTION FAR-INFRARED SPECTROMETER AT 28 KM
GRANT NSG 5175
0
Semiannual Status Report No. 8
For the period 1 January 1981 to 15 June 1981
Dr. Wesley A. Traub
Principal Investigator
May 1981
Prepared for
National Aeronautics and Space Administration
Greenbelt, Maryland 20771
Smithsonian Institution
Astrophysical Observatory
Cambridge, MA 02138
The Smithsonian Astrophysical Observatory
and the Harvard College Observatory
are members of the
Center for Astrophysics
The NASA Technical Officer for this grant is Edith I. Reed, Code 963
Laboratory for Planetary Atmospheres, Applications Directorate, Goddard
Space Flight Center, Greenbelt, Maryland 20771.
I	 A6
.. _.......... _.__ _ 	
I. Personnel Working on this Grant During this Reporting Period:
Dr. Wesley A. Traub (Principal Investigator).
Dr. Kelly V. Chance (Co-Investigator).
Dr. Giovanni G. Fazio (Co-Investigator).
Dr. Stephen C. Wofsy (Co-Investigator).
11. Status Summary_
During the present reporting period we have been primarily
concer.-d with analysis of data from our December 1980 Might,
including efforts in the following areas: (1) computer, analysis
of the flight spectra to obtain phase corrected, normalized sums
of spectra for retrieval of atmospheric profiles, (2) study of
atmospheric 11F, FICI and H 2O and (3) a limited amount of effort on
stj;dtospharic H 2O 2 and :10C1. In addition, we have workoe in the
following areas which are relevant for this grant, but are
noverthelees .funded from other sources: (4) laboratory spectro-
scopy of HOCI (under GMA contract funding) and (5) design study
of a new balloon gondola (with Smithsonian internal funding).
(1) An extensive effort has gone into completing the
computer analysis necessary for inverting flight data to give
stratospheric profiles, taking proper account of the optical
depth of lines from trace species, and of interfering lines in the
stratospheric spectrum: (a) The majority of the flight data was
taken in the low background mode,, i.e. with one input to the
spectrometer looking at the sky and the other looking at a LN2
temperature blackbody. These spectra required phase correction
using the technique outlined in the previous status report (No. 7)
to project out the correct part of the complex spectrum. This has
.t
k;
Ii
a+
ae
now been completed. The spectra thus obtained are still
normalized to the spectrometer response curve (a function of
the blackbody spectrum, filters, detector response and some
channeling from parallel optical, components) and contain a low
frequency baseline modulation clue to the slight difference in the
optics seen by the two inputs to the interferometer. The spectra
were grouped according to elevation angle and corrected and
normalized gay (i) subtracting the baseline ripple and (ii) dividing
by a blackbody response ,function for the spectrometer obtained
from the envelope of the spectrum for high background spectra
taken during the flight. The result is a number of very high
quality coadded emission spectra normalized to a reference
blackbody spectrum, summarized in table 1.. Examples of these
:spectra, showing the entire spectral band pass of the instrument
are ahown in .figure lJ (b) An improved atmospheric modelling
program for generating stratospheric spectra using the current
AFGL line parameter listing in being written. Such a program is
vital to our efforts to avoid including interfering lines in our
measurement of equivalent widths of lines from stratospheric
trace species. Figure 2 is a comparison of a synthetic spectrum
with an atmospheric spectrum in spectral regions around several
HF and HCl emission lines; (c) Development of an accurate method
for retrieving atmospheric profiles from flight data taking
atmospheric geometry and optical depth of the lines properly into
account, is at a preliminary stage at this time.
(2) Stratospheric fir, HCl and H 2O lines are shown in figure
2, along with a synthetic spectrum from the AFGL line parameter
listing. These three molecules are being studied together since
the stratospheric chlorine and kir vine abundances are very
important for evaluation of the effects of chlorofluorocarbons on
the ozone layer and the 11 2 0 concentration in correlated to the
partitioning of chlorine among the various stratospheric sinks.
UP line broadening parameters appropriate for both the far-
infrared rotational lines and the infrared fundamental lines have
been derived from the limited HP broadening data in the literature.
These are given in table 2. A critical analysis of 11F (1-0)
stratospheric measurements in the literature in being undertaken in
conjunction with our HP analysis.
The results from our present analysis for abundances of 11F,
11cl and 1120 in the stratosphere above our balloon altitude should
be ready to submit for pub l-ication within several weeks. The full
f3tratospheria profilesi from limb scanning will be obtained as soon
as possible.
(3) Measurement of H 202  and HOU q-branches in stratospheric
spectra involves careful removal of interfering spectral, lines.
Work on these molecules is continuing, along with the program of
atmospheric modelling of interfering lines.
(4) Laboratory spectroscopy of JjOCl, under CMA contract
funding, is in progress. High quality spectra showing the HOU
q-branches under optically thin conditions have been obtained.
Ms. Michel Wilson has been employed as a computer aide under
the CMA contract.
(5) A design study for a lightweight balloon platform and
telescope specifically designed for stratospheric work is underway,
using Smithsonian Institution internal funds. The design under
consideration includes the following features: (a) total launch
F
9
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weight ' 1000 lb., (b) 9.50 inch f/9 Newtonian telescope, with
12 arominute field of view and (c) pointing in absolute elevation
to 3 arcminutes using feedback from an oil dampened pendulous
inclinometer in combination with a rate gyro coLrected for earth
rotation.
III. Proseots for Future Work
The next reporting period will be spent analyzing flight
data to obtain concentrations of stratospheric species and
continuing with laboratory spectroscopy under the combination of
NASA and CMA funding, We should have the HF, HM and H2a results
abode 29 km submitted for publication early in the reporting
period. Complete profiles should be available in several
months. Analysis of H2O2 and IN= from our flight data should be
substantially complete by that time. n-type transition strengths
for the q-branches of HOC1 should be available within several
months from laboratory spectra. A balloon flight in the fall of
1981 has been effectively ruled out because of refurbishment of
the 102 cm balloon-borne telescope.
Table 1
Summary of December 1980 Flight Spectra
BlovahigA(L_ALiq3e	 No. spoans )P.r dp*tPctoK)_	 Effective Sam lin _Hq i2ht(k m)_J
	24.80	32	 33.5
	
1.8.0 '
	 16	 33.5
	
8.10	3'-)	 33.3
	
1.10 	 4	 31.6
	
-0.10	 0	 31.2
	
-D.  "1	 20	 28.7
	
-1.5	 7	 2G.7
	
-2.40	 	 23.0
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Table 2
Line Broadening Coefficiento for 11F/air at 226°k
Tranpition	 /P (crosl'atm
4
(0-0)	 Ro t Pi 0.090 * 0.013
R1, A2 0.090 i 0,013
R2 1 P3 0.079 ;t 0.011
R3, P4 0,062 i 0.009
R4, P5 0.056 t 0.008
R5, P6 0.045 -:L 0.009
(1-0)	 RO, P1 0.108 j 0.017
Rl, P2 0.108 as 0.017
R2, P3 0.095 0.015
R3, P4 0.074 0.012
M t P5 0.068 :t 0.011
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Figure 2 - HI,' and HCI stratospheric lines at 24.80 elevation compared to
a synthetic spectrum using AFGL line parameters.
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Measurement of HO2 and other trace gases in the stratosphere using a high resolution far infrared spectrometer at 28 Km

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