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336 results on '"Lacis, Andrew A."'

112. Global, seasonal cloud variations from satellite radiance measurements. I - Sensitivity of analysis

Author

Rossow, William B, Garder, Leonid C, and Lacis, Andrew A

Subjects
Meteorology And Climatology
Abstract

Global, daily, visible and IR radiance measurements from the NOAA-5 Scanning Radiometer (SR) are analyzed for the months of January, April, July and October, 1977 to infer cloud and surface radiative properties. In this paper, the data and analysis method are described. A unique feature of the method is that it utilizes radiative transfer models that simulate the SR measurements using explicit parameters representing the properties of the surface, atmosphere, and clouds. The accuracy of all the results depends primarily on the proper separation of the total radiance distribution into those parts representing clear and cloudy scenes.

Published
1989
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113. Spectral radiometry and tropospheric aerosols: Report of panel

Author

Fraser, Robert S, Griggs, Michael, Lacis, Andrew A, and Mcmaster, L. R

Subjects
Geophysics
Abstract

The term aerosols, as used here, refers to the haze, smoke, and dust that appear in the troposphere. The term does not refer to the hydrometeors in cumulus and stratus clouds but does include the sulfuric acid-water droplets which are assumed to predominate in the stratospheric aerosol layer. The aerosol properties that were measured from satellites and those which can be made in the near term (up to 1992) will be reviewed. The capabilities that will exist in the years 1992 to 2000, with implementation of EOS, are then discussed. Finally, a few words will be said concerning the potential for aerosol measurements for the decade after 2000.

Published
1987

149. Atmospheric C0²: Principal Control Knob Governing Earth's Temperature.

Author

Lacis, Andrew A., Schmidt, Gavin A., Rind, David, and Ruedy, Reto A.

Subjects
*ATMOSPHERIC carbon dioxide & the environment, *TEMPERATURE control, *EARTH temperature, *GREENHOUSE gases, *ATMOSPHERIC water vapor, *RADIATIVE forcing
Abstract

Ample physical evidence shows that carbon dioxide (CO²) is the single most important climate-relevant greenhouse gas in Earth's atmosphere. This is because CO², like ozone, N²O, CH4, and chlorofluorocarbons, does not condense and precipitate from the atmosphere at current climate temperatures, whereas water vapor can and does. Noncondensing greenhouse gases, which account for 25% of the total terrestrial greenhouse effect, thus serve to provide the stable temperature structure that sustains the current levels of atmospheric water vapor and clouds via feedback processes that account for the remaining 75% of the greenhouse effect. Without the radiative forcing supplied by CO²; and the other noncondensing greenhouse gases, the terrestrial greenhouse would collapse, plunging the global climate into an icebound Earth state. [ABSTRACT FROM AUTHOR]

Published
2010
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