Total ozone and aerosol optical depths inferred from radiometric measurements in the Chappuis absorption band

Journal Article · Thu Apr 15 00:00:00 EDT 1993 · Journal of the Atmospheric Sciences; (United States)

DOI:https://doi.org/10.1175/1520-0469(1993)050<1113:TOAAOD>2.0.CO;2· OSTI ID:6381608

Flittner, D E; Herman, B M; Thome, K J; Simpson, J M; Reagan, J A ^[1]

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1. Univ. of Arizona, Tucson (United States)

A second-derivative smoothing technique, commonly used in inversion work, is applied to the problem of inferring total columnar ozone amounts and aerosol optical depths. The application is unique in that the unknowns (i.e., total columnar ozone and aerosol optical depth) may be solved for directly without employing standard inversion methods. It is shown, however, that by employing inversion constraints, better solutions are normally obtained. The current method requires radiometric measurements of total optical depth through the Chappuis ozone band. It assumes no a priori shape for the aerosol optical depth versus wavelength profile and makes no assumptions about the ozone amount. Thus, the method is quite versatile and able to deal with varying total ozone and various aerosol size distributions. The technique is applied first in simulation, then to 119 days of measurements taken in Tucson, Arizona, that are compared to TOMS values for the same dates. The technique is also applied to two measurements taken at Mauna Loa, Hawaii, for which Dobson ozone values are available in addition to the TOMS values, and the results agree to within 15%. It is also shown through simulations that additional information can be obtained from measurements outside the Chappuis band. This approach reduces the bias and spread of the estimates total ozone and is unique in that it uses measurements from both the Chappuis and Huggins absorption bands. 12 refs., 6 figs., 2 tabs.

• OSTI ID: 6381608
• Journal Information: Journal of the Atmospheric Sciences; (United States), Vol. 50:8; ISSN 0022-4928
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AEROSOLS
OPTICAL DEPTH CURVE
OZONE
ALGORITHMS
ARIZONA
ATMOSPHERIC CHEMISTRY
CALCULATION METHODS
COMPUTERIZED SIMULATION
HAWAII
VALIDATION
VOLCANIC GASES
CHEMISTRY
COLLOIDS
DEVELOPED COUNTRIES
DIAGRAMS
DISPERSIONS
FLUIDS
GASES
MATHEMATICAL LOGIC
NORTH AMERICA
SIMULATION
SOLS
TESTING
USA
540120* - Environment
Atmospheric- Chemicals Monitoring &amp; Transport- (1990-)