Abstract

The laser absorption spectrometer (LAS) is an airborne instrument able to perform remote measurement of trace atmospheric gases. The instrument uses a pair of carbon dioxide laser–heterodyne receiver systems that are directed downward from an airplane and determines gas concentration by the differential absorption method. Configured to measure tropospheric ozone, the LAS has been used in conjunction with another instrumented aircraft to test the accuracy of this method of measurement. A complete description of the instrument is presented, and the results of extensive flight testing are summarized.

© 1981 Optical Society of America

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Corrections

M. S. Shumate, R. T. Menzies, W. B. Grant, and D. S. McDougal, "Laser absorption spectrometer: remote measurement of tropospheric ozone; erratum," Appl. Opt. 20, 1278-1278 (1981)
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-20-8-1278

References

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  1. R. T. Menzies, M. S. Shumate, J. Geophys. Res. 83, 4039 (1978).
    [Crossref]
  2. M. S. Shumate, R. T. Menzies, “Airborne Laser Absorption Spectrometer: A New Instrument for Remote Measurement of Atmospheric Trace Gases” in Proceedings, Fourth Conference on Sensing of Environmental Pollutants (American Chemical Society, Washington, D.C., 1978), p. 114.
  3. R. T. Menzies, Opt. Eng. 17, 44 (1978).
    [Crossref]
  4. R. T. Menzies, Appl. Opt. 15, 2597 (1976).
    [Crossref] [PubMed]
  5. R. R. Patty, G. M. Russwurm, W. A. McClenny, D. R. Morgan, Appl. Opt. 13, 2850 (1974).
    [Crossref] [PubMed]
  6. J. Boscher, G. Schafer, W. Wiesemann, “Gasfernanalyse mit CO2-Laser,” Battelle Institute e.V., D-6000 Frankfurt am Main, West Germany (1979).
  7. D. S. McDougal, G. L. Gregory, “Southeast Virginia Urban Plume Study: Design Considerations and Measurement Results,” in Proceedings, Second Joint Conference on Applications of Air Pollution Meteorology (American Meteorological Society, Boston, 1980), p. 173.
  8. M. S. Shumate, W. B. Grant, R. T. Menzies, “Participation of the Laser Absorption Spectrometer in the 1979 Southeast Virginia Urban Plume Study,” Technical Report 715-26 to NASA Langley Research Center (1980).
  9. G. L. Gregory, O. S. McDougal, H. S. Wagner, “An Air Quality Program Designed to Evaluate Remote Sensors,” paper presented at the 73rd Air Pollution Control Association Meeting, Montreal, Canada (1980).
  10. G. L. Gregory, D. E. Wornam, J. J. Mathis, D. I. Sebacher, “Summary of 1978 Southeastern Virginia Urban Plume Measurement Data: Aircraft Results for Ozone, Nitrogen Oxides, and Methane,” NASA TM 80146 (U.S. GPO, Washington, D.C., 1980).
  11. G. L. Gregory, D. S. McDougal, J. J. Mathis, “Compendium of In Situ Ozone Data for Evaluation of the Laser Absorption Spectrometer Remote Sensor: 1979 Southeastern Virginia Urban Plume Study Summer Field Program,” NASA TM (U.S. GPO, Washington, D.C., 1980).
  12. M. L. Saeger, W. C. Eaton, J. B. Tommerdahl, “Comparison of Ozone Measurements Made by Remote Sensor (Laser Absorption Spectrometer) and In Situ Sensor (Chemiluminescence) on August 23, 1979 in Support of the Southeastern Virginia Urban Plume Study,” Research Triangle Institute, Research Triangle Park, North Carolina, Final Report RTI/1816/03-F (1980).
  13. W. L. Wolfe, G. J. Zissis, Eds., The Infrared Handbook (Office of the Navy, Washington, D.C., 1978), pp. 3-90–3-147.
  14. J. Boscher, F. Lehmann, “Experimentale Untersuchungen der physikalischen Grundlagen zur Fernmessung von Boden und Vegetationsfeuchte durch aktive Infrarot—Reflexionsspektroskopie mit Hilfe der CO2—Lasertechnik,” Battelle-Institut e.V., Frankfurt am Main, West Germany (1980).
  15. W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
    [Crossref]
  16. R. J. Nordstrom, M. E. Thomas, J. F. Donovan, K. Gass, “Atmospheric Water Vapor Absorption at 12 CO2 Laser Frequencies,” Ohio State U., Oepartment of Electrical Engineering, Columbus, Final Report 711934-1 (1979).
  17. W. B. Grant, M. S. Shumate, “Remote Measurements of Ozone Burdens in the LA Basin on September 20 and 24, 1979, Using the JPL Airborne Laser Absorption Spectrometer,” Final Report 5030-442 to NASA Office of Technology Utilization (1980).
  18. A. Barbe, C. Secroum, P. Jouve, J. Mol. Spectrosc. 64, 343 (1977).
    [Crossref]
  19. E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
    [Crossref]
  20. M. S. Shumate, R. T. Menzies, “On the Possibility of Measuring Atmospheric Water Vapor with an Airborne Absorption Spectrometer,” presented at Workshop on Atmospheric Water Vapor, Vail, Colo. (1979).
  21. W. Schnell, G. Fischer, Appl. Opt. 14, 2058 (1975).
    [Crossref] [PubMed]
  22. F. Allario, R. K. Seals, Appl. Opt. 14, 2229 (1975).
    [Crossref] [PubMed]
  23. E. R. Murray, Opt. Eng. 17, 30 (1978).
  24. R. T. Menzies, M. T. Chahine, Appl. Opt. 13, 2840 (1974).
    [Crossref] [PubMed]
  25. G. Megie, R. T. Menzies, Appl. Opt. 19, 1173 (1980).
    [Crossref] [PubMed]

1980 (1)

1978 (4)

E. R. Murray, Opt. Eng. 17, 30 (1978).

R. T. Menzies, M. S. Shumate, J. Geophys. Res. 83, 4039 (1978).
[Crossref]

R. T. Menzies, Opt. Eng. 17, 44 (1978).
[Crossref]

W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
[Crossref]

1977 (1)

A. Barbe, C. Secroum, P. Jouve, J. Mol. Spectrosc. 64, 343 (1977).
[Crossref]

1976 (2)

E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
[Crossref]

R. T. Menzies, Appl. Opt. 15, 2597 (1976).
[Crossref] [PubMed]

1975 (2)

1974 (2)

Allario, F.

Barbe, A.

A. Barbe, C. Secroum, P. Jouve, J. Mol. Spectrosc. 64, 343 (1977).
[Crossref]

Beck, R.

W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
[Crossref]

Boscher, J.

J. Boscher, F. Lehmann, “Experimentale Untersuchungen der physikalischen Grundlagen zur Fernmessung von Boden und Vegetationsfeuchte durch aktive Infrarot—Reflexionsspektroskopie mit Hilfe der CO2—Lasertechnik,” Battelle-Institut e.V., Frankfurt am Main, West Germany (1980).

J. Boscher, G. Schafer, W. Wiesemann, “Gasfernanalyse mit CO2-Laser,” Battelle Institute e.V., D-6000 Frankfurt am Main, West Germany (1979).

Chahine, M. T.

Donovan, J. F.

R. J. Nordstrom, M. E. Thomas, J. F. Donovan, K. Gass, “Atmospheric Water Vapor Absorption at 12 CO2 Laser Frequencies,” Ohio State U., Oepartment of Electrical Engineering, Columbus, Final Report 711934-1 (1979).

Eaton, W. C.

M. L. Saeger, W. C. Eaton, J. B. Tommerdahl, “Comparison of Ozone Measurements Made by Remote Sensor (Laser Absorption Spectrometer) and In Situ Sensor (Chemiluminescence) on August 23, 1979 in Support of the Southeastern Virginia Urban Plume Study,” Research Triangle Institute, Research Triangle Park, North Carolina, Final Report RTI/1816/03-F (1980).

Englisch, W.

W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
[Crossref]

Fischer, G.

Gass, K.

R. J. Nordstrom, M. E. Thomas, J. F. Donovan, K. Gass, “Atmospheric Water Vapor Absorption at 12 CO2 Laser Frequencies,” Ohio State U., Oepartment of Electrical Engineering, Columbus, Final Report 711934-1 (1979).

Grant, W. B.

W. B. Grant, M. S. Shumate, “Remote Measurements of Ozone Burdens in the LA Basin on September 20 and 24, 1979, Using the JPL Airborne Laser Absorption Spectrometer,” Final Report 5030-442 to NASA Office of Technology Utilization (1980).

M. S. Shumate, W. B. Grant, R. T. Menzies, “Participation of the Laser Absorption Spectrometer in the 1979 Southeast Virginia Urban Plume Study,” Technical Report 715-26 to NASA Langley Research Center (1980).

Gregory, G. L.

G. L. Gregory, O. S. McDougal, H. S. Wagner, “An Air Quality Program Designed to Evaluate Remote Sensors,” paper presented at the 73rd Air Pollution Control Association Meeting, Montreal, Canada (1980).

D. S. McDougal, G. L. Gregory, “Southeast Virginia Urban Plume Study: Design Considerations and Measurement Results,” in Proceedings, Second Joint Conference on Applications of Air Pollution Meteorology (American Meteorological Society, Boston, 1980), p. 173.

G. L. Gregory, D. E. Wornam, J. J. Mathis, D. I. Sebacher, “Summary of 1978 Southeastern Virginia Urban Plume Measurement Data: Aircraft Results for Ozone, Nitrogen Oxides, and Methane,” NASA TM 80146 (U.S. GPO, Washington, D.C., 1980).

G. L. Gregory, D. S. McDougal, J. J. Mathis, “Compendium of In Situ Ozone Data for Evaluation of the Laser Absorption Spectrometer Remote Sensor: 1979 Southeastern Virginia Urban Plume Study Summer Field Program,” NASA TM (U.S. GPO, Washington, D.C., 1980).

Gürs, K.

W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
[Crossref]

Hake, R. D.

E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
[Crossref]

Hawley, J. G.

E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
[Crossref]

Jouve, P.

A. Barbe, C. Secroum, P. Jouve, J. Mol. Spectrosc. 64, 343 (1977).
[Crossref]

Lehmann, F.

J. Boscher, F. Lehmann, “Experimentale Untersuchungen der physikalischen Grundlagen zur Fernmessung von Boden und Vegetationsfeuchte durch aktive Infrarot—Reflexionsspektroskopie mit Hilfe der CO2—Lasertechnik,” Battelle-Institut e.V., Frankfurt am Main, West Germany (1980).

Mathis, J. J.

G. L. Gregory, D. S. McDougal, J. J. Mathis, “Compendium of In Situ Ozone Data for Evaluation of the Laser Absorption Spectrometer Remote Sensor: 1979 Southeastern Virginia Urban Plume Study Summer Field Program,” NASA TM (U.S. GPO, Washington, D.C., 1980).

G. L. Gregory, D. E. Wornam, J. J. Mathis, D. I. Sebacher, “Summary of 1978 Southeastern Virginia Urban Plume Measurement Data: Aircraft Results for Ozone, Nitrogen Oxides, and Methane,” NASA TM 80146 (U.S. GPO, Washington, D.C., 1980).

McClenny, W. A.

McDougal, D. S.

D. S. McDougal, G. L. Gregory, “Southeast Virginia Urban Plume Study: Design Considerations and Measurement Results,” in Proceedings, Second Joint Conference on Applications of Air Pollution Meteorology (American Meteorological Society, Boston, 1980), p. 173.

G. L. Gregory, D. S. McDougal, J. J. Mathis, “Compendium of In Situ Ozone Data for Evaluation of the Laser Absorption Spectrometer Remote Sensor: 1979 Southeastern Virginia Urban Plume Study Summer Field Program,” NASA TM (U.S. GPO, Washington, D.C., 1980).

McDougal, O. S.

G. L. Gregory, O. S. McDougal, H. S. Wagner, “An Air Quality Program Designed to Evaluate Remote Sensors,” paper presented at the 73rd Air Pollution Control Association Meeting, Montreal, Canada (1980).

Megie, G.

Menzies, R. T.

G. Megie, R. T. Menzies, Appl. Opt. 19, 1173 (1980).
[Crossref] [PubMed]

R. T. Menzies, M. S. Shumate, J. Geophys. Res. 83, 4039 (1978).
[Crossref]

R. T. Menzies, Opt. Eng. 17, 44 (1978).
[Crossref]

R. T. Menzies, Appl. Opt. 15, 2597 (1976).
[Crossref] [PubMed]

R. T. Menzies, M. T. Chahine, Appl. Opt. 13, 2840 (1974).
[Crossref] [PubMed]

M. S. Shumate, R. T. Menzies, “Airborne Laser Absorption Spectrometer: A New Instrument for Remote Measurement of Atmospheric Trace Gases” in Proceedings, Fourth Conference on Sensing of Environmental Pollutants (American Chemical Society, Washington, D.C., 1978), p. 114.

M. S. Shumate, R. T. Menzies, “On the Possibility of Measuring Atmospheric Water Vapor with an Airborne Absorption Spectrometer,” presented at Workshop on Atmospheric Water Vapor, Vail, Colo. (1979).

M. S. Shumate, W. B. Grant, R. T. Menzies, “Participation of the Laser Absorption Spectrometer in the 1979 Southeast Virginia Urban Plume Study,” Technical Report 715-26 to NASA Langley Research Center (1980).

Morgan, D. R.

Murray, E. R.

E. R. Murray, Opt. Eng. 17, 30 (1978).

E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
[Crossref]

Nordstrom, R. J.

R. J. Nordstrom, M. E. Thomas, J. F. Donovan, K. Gass, “Atmospheric Water Vapor Absorption at 12 CO2 Laser Frequencies,” Ohio State U., Oepartment of Electrical Engineering, Columbus, Final Report 711934-1 (1979).

Patty, R. R.

Russwurm, G. M.

Saeger, M. L.

M. L. Saeger, W. C. Eaton, J. B. Tommerdahl, “Comparison of Ozone Measurements Made by Remote Sensor (Laser Absorption Spectrometer) and In Situ Sensor (Chemiluminescence) on August 23, 1979 in Support of the Southeastern Virginia Urban Plume Study,” Research Triangle Institute, Research Triangle Park, North Carolina, Final Report RTI/1816/03-F (1980).

Schafer, G.

J. Boscher, G. Schafer, W. Wiesemann, “Gasfernanalyse mit CO2-Laser,” Battelle Institute e.V., D-6000 Frankfurt am Main, West Germany (1979).

Schnell, W.

Seals, R. K.

Sebacher, D. I.

G. L. Gregory, D. E. Wornam, J. J. Mathis, D. I. Sebacher, “Summary of 1978 Southeastern Virginia Urban Plume Measurement Data: Aircraft Results for Ozone, Nitrogen Oxides, and Methane,” NASA TM 80146 (U.S. GPO, Washington, D.C., 1980).

Secroum, C.

A. Barbe, C. Secroum, P. Jouve, J. Mol. Spectrosc. 64, 343 (1977).
[Crossref]

Shumate, M. S.

R. T. Menzies, M. S. Shumate, J. Geophys. Res. 83, 4039 (1978).
[Crossref]

M. S. Shumate, R. T. Menzies, “Airborne Laser Absorption Spectrometer: A New Instrument for Remote Measurement of Atmospheric Trace Gases” in Proceedings, Fourth Conference on Sensing of Environmental Pollutants (American Chemical Society, Washington, D.C., 1978), p. 114.

M. S. Shumate, R. T. Menzies, “On the Possibility of Measuring Atmospheric Water Vapor with an Airborne Absorption Spectrometer,” presented at Workshop on Atmospheric Water Vapor, Vail, Colo. (1979).

W. B. Grant, M. S. Shumate, “Remote Measurements of Ozone Burdens in the LA Basin on September 20 and 24, 1979, Using the JPL Airborne Laser Absorption Spectrometer,” Final Report 5030-442 to NASA Office of Technology Utilization (1980).

M. S. Shumate, W. B. Grant, R. T. Menzies, “Participation of the Laser Absorption Spectrometer in the 1979 Southeast Virginia Urban Plume Study,” Technical Report 715-26 to NASA Langley Research Center (1980).

Thomas, M. E.

R. J. Nordstrom, M. E. Thomas, J. F. Donovan, K. Gass, “Atmospheric Water Vapor Absorption at 12 CO2 Laser Frequencies,” Ohio State U., Oepartment of Electrical Engineering, Columbus, Final Report 711934-1 (1979).

Tommerdahl, J. B.

M. L. Saeger, W. C. Eaton, J. B. Tommerdahl, “Comparison of Ozone Measurements Made by Remote Sensor (Laser Absorption Spectrometer) and In Situ Sensor (Chemiluminescence) on August 23, 1979 in Support of the Southeastern Virginia Urban Plume Study,” Research Triangle Institute, Research Triangle Park, North Carolina, Final Report RTI/1816/03-F (1980).

Van der Laan, J. E.

E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
[Crossref]

Wagner, H. S.

G. L. Gregory, O. S. McDougal, H. S. Wagner, “An Air Quality Program Designed to Evaluate Remote Sensors,” paper presented at the 73rd Air Pollution Control Association Meeting, Montreal, Canada (1980).

Wiesemann, W.

W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
[Crossref]

J. Boscher, G. Schafer, W. Wiesemann, “Gasfernanalyse mit CO2-Laser,” Battelle Institute e.V., D-6000 Frankfurt am Main, West Germany (1979).

Wornam, D. E.

G. L. Gregory, D. E. Wornam, J. J. Mathis, D. I. Sebacher, “Summary of 1978 Southeastern Virginia Urban Plume Measurement Data: Aircraft Results for Ozone, Nitrogen Oxides, and Methane,” NASA TM 80146 (U.S. GPO, Washington, D.C., 1980).

Appl. Opt. (6)

Appl. Phys. (1)

W. Wiesemann, R. Beck, W. Englisch, K. Gürs, Appl. Phys. 15, 257 (1978).
[Crossref]

Appl. Phys. Lett. (1)

E. R. Murray, R. D. Hake, J. E. Van der Laan, J. G. Hawley, Appl. Phys. Lett. 28, 542 (1976).
[Crossref]

J. Geophys. Res. (1)

R. T. Menzies, M. S. Shumate, J. Geophys. Res. 83, 4039 (1978).
[Crossref]

J. Mol. Spectrosc. (1)

A. Barbe, C. Secroum, P. Jouve, J. Mol. Spectrosc. 64, 343 (1977).
[Crossref]

Opt. Eng. (2)

R. T. Menzies, Opt. Eng. 17, 44 (1978).
[Crossref]

E. R. Murray, Opt. Eng. 17, 30 (1978).

Other (13)

M. S. Shumate, R. T. Menzies, “On the Possibility of Measuring Atmospheric Water Vapor with an Airborne Absorption Spectrometer,” presented at Workshop on Atmospheric Water Vapor, Vail, Colo. (1979).

M. S. Shumate, R. T. Menzies, “Airborne Laser Absorption Spectrometer: A New Instrument for Remote Measurement of Atmospheric Trace Gases” in Proceedings, Fourth Conference on Sensing of Environmental Pollutants (American Chemical Society, Washington, D.C., 1978), p. 114.

R. J. Nordstrom, M. E. Thomas, J. F. Donovan, K. Gass, “Atmospheric Water Vapor Absorption at 12 CO2 Laser Frequencies,” Ohio State U., Oepartment of Electrical Engineering, Columbus, Final Report 711934-1 (1979).

W. B. Grant, M. S. Shumate, “Remote Measurements of Ozone Burdens in the LA Basin on September 20 and 24, 1979, Using the JPL Airborne Laser Absorption Spectrometer,” Final Report 5030-442 to NASA Office of Technology Utilization (1980).

J. Boscher, G. Schafer, W. Wiesemann, “Gasfernanalyse mit CO2-Laser,” Battelle Institute e.V., D-6000 Frankfurt am Main, West Germany (1979).

D. S. McDougal, G. L. Gregory, “Southeast Virginia Urban Plume Study: Design Considerations and Measurement Results,” in Proceedings, Second Joint Conference on Applications of Air Pollution Meteorology (American Meteorological Society, Boston, 1980), p. 173.

M. S. Shumate, W. B. Grant, R. T. Menzies, “Participation of the Laser Absorption Spectrometer in the 1979 Southeast Virginia Urban Plume Study,” Technical Report 715-26 to NASA Langley Research Center (1980).

G. L. Gregory, O. S. McDougal, H. S. Wagner, “An Air Quality Program Designed to Evaluate Remote Sensors,” paper presented at the 73rd Air Pollution Control Association Meeting, Montreal, Canada (1980).

G. L. Gregory, D. E. Wornam, J. J. Mathis, D. I. Sebacher, “Summary of 1978 Southeastern Virginia Urban Plume Measurement Data: Aircraft Results for Ozone, Nitrogen Oxides, and Methane,” NASA TM 80146 (U.S. GPO, Washington, D.C., 1980).

G. L. Gregory, D. S. McDougal, J. J. Mathis, “Compendium of In Situ Ozone Data for Evaluation of the Laser Absorption Spectrometer Remote Sensor: 1979 Southeastern Virginia Urban Plume Study Summer Field Program,” NASA TM (U.S. GPO, Washington, D.C., 1980).

M. L. Saeger, W. C. Eaton, J. B. Tommerdahl, “Comparison of Ozone Measurements Made by Remote Sensor (Laser Absorption Spectrometer) and In Situ Sensor (Chemiluminescence) on August 23, 1979 in Support of the Southeastern Virginia Urban Plume Study,” Research Triangle Institute, Research Triangle Park, North Carolina, Final Report RTI/1816/03-F (1980).

W. L. Wolfe, G. J. Zissis, Eds., The Infrared Handbook (Office of the Navy, Washington, D.C., 1978), pp. 3-90–3-147.

J. Boscher, F. Lehmann, “Experimentale Untersuchungen der physikalischen Grundlagen zur Fernmessung von Boden und Vegetationsfeuchte durch aktive Infrarot—Reflexionsspektroskopie mit Hilfe der CO2—Lasertechnik,” Battelle-Institut e.V., Frankfurt am Main, West Germany (1980).

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Figures (12)

Fig. 1
Fig. 1

LAS optical head with one cover panel removed. One of the waveguide CO2 lasers is in the foreground. Photodetectors are mounted in the bottom-looking nitrogen Dewars which are clamped to the telescope tube.

Fig. 2
Fig. 2

LAS optical schematic showing one channel.

Fig. 3
Fig. 3

Block diagram of the LAS electronics and signal processing systems.

Fig. 4
Fig. 4

Schematic depiction of the flight patterns of the LAS aircraft (upper) and in situ aircraft (lower) during calibration measurements.

Fig. 5
Fig. 5

In situ ozone concentrations, 9 Aug. 1979: —, data from the spiral portions of the pattern; ●, data from the constant altitude traverses; and ↓, surface data from a nearby ground station, 1400 EDT.

Fig. 6
Fig. 6

Map of southeast Virginia showing the flight tracks for several measurements.

Fig. 7
Fig. 7

Schematic depiction of box face pattern for correlative measurements: —, in situ aircraft pattern; - - -, LAS aircraft pattern.

Fig. 8
Fig. 8

Ozone profiles on each of four vertical segments of LAS box face pattern, 23 Aug. 1979.

Fig. 9
Fig. 9

Comparison of LAS and aircraft in situ ozone data for flight track AB of 16 Aug. 1979.

Fig. 10
Fig. 10

Comparison of LAS and aircraft in situ ozone data for flight track CD of 23 Aug. 1980.

Fig. 11
Fig. 11

Ozone data comparison of urban plume measurements, 30 Aug. 1979. LAS data (○) and Dasibi data (—) were taken on track EF, 1415–1445 EDT at a 750-m altitude. Data from the in situ aircraft (- - -) were taken 2 h later and 20 km downwind.

Fig. 12
Fig. 12

LAS ozone data in the Los Angeles Basin on 24 Sept. 1979, starting at 1345 h at Palm Springs, reaching the ocean at 1450 h PDT. The boxes represent hourly averages for ozone monitored at ground stations by local agencies.

Tables (2)

Tables Icon

Table I Ozone Burdens Determined from In Situ Aircraft Measurements

Tables Icon

Table II Sources of Measurement Uncertainty in the LAS

Equations (1)

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[ O 3 ] = - 1 Δ α h ln R g R 0 ,

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