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

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 approachmore » 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.« less
Authors:
; ; ; ;  [1]
  1. (Univ. of Arizona, Tucson (United States))
Publication Date:
OSTI Identifier:
6381608
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Atmospheric Sciences; (United States); Journal Volume: 50:8
Country of Publication:
United States
Language:
English
Subject:
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 & Transport-- (1990-)