Light extinction in the atmosphere
Atmospheric aerosol particles originating from natural sources, such as volcanos and sulfur-bearing gas emissions from the oceans, and from human sources, such as sulfur emissions from fossil fuel combustion and biomass burning, strongly affect visual air quality and are suspected to significantly affect radiative climate forcing of the planet. During the daytime, aerosols obscure scenic vistas, while at night they diminish our ability to observe stellar objects. Scattering of light is the main means by which aerosols attenuate and redistribute light in the atmosphere and by which aerosols can alter and reduce visibility and potentially modify the energy balance of the planet. Trends and seasonal variability of atmospheric aerosol loading, such as column-integrated light extinction or optical depth, and how they may affect potential climate change have been difficult to quantify because there have been few observations made of important aerosol optical parameters, such as optical depth, over the globe and over time and often these are of uneven quality. To address questions related to possible climate change, there is a pressing need to acquire more high-quality aerosol optical depth data. Extensive deployment of improved solar radiometers over the next few years will provide higher-quality extinction data over a wider variety of locations worldwide. An often overlooked source of turbidity data, however, is available from astronomical observations, particularly stellar photoelectric photometry observations. With the exception of the Project ASTRA articles published almost 20 years ago, few of these data ever appear in the published literature. This paper will review the current status of atmospheric extinction observations, as highlighted by the ASTRA work and augmented by more recent solar radiometry measurements.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 10114255
- Report Number(s):
- PNL-SA-21022; CONF-9206325-1; ON: DE93005034
- Resource Relation:
- Conference: IAU/ICSU/UNESCO exposition in the adverse environment impact on astronomy,Paris (France),30 Jun - 2 Jul 1992; Other Information: PBD: Jun 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
54 ENVIRONMENTAL SCIENCES
VISIBLE RADIATION
ATTENUATION
EARTH ATMOSPHERE
LIGHT SCATTERING
CLIMATIC CHANGE
RADIOMETRIC SURVEYS
ASTRONOMY
AIR QUALITY
AEROSOLS
TURBIDITY
GREENHOUSE EFFECT
ATMOSPHERIC CHEMISTRY
OPTICAL DEPTH CURVE
661300
540310
OTHER ASPECTS OF PHYSICAL SCIENCE
BASIC STUDIES