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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 32 — Nov. 10, 2005
  • pp: 6986–6994

Use of shadows to retrieve water vapor in hazy atmospheres

North F. Larsen and K. Stamnes  »View Author Affiliations


Applied Optics, Vol. 44, Issue 32, pp. 6986-6994 (2005)
http://dx.doi.org/10.1364/AO.44.006986


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Abstract

Techniques aimed at retrieving water vapor from satellite data of reflected near-infrared solar radiation have progressed significantly in recent years. These techniques rely on observation of water vapor attenuation of near-infrared solar radiation reflected by the Earth’s surface. Ratios of measured radiances at wavelengths inside and outside water vapor absorbing channels are used for retrieval purposes. These ratios partially remove the dependence of surface reflectance on wavelength and are used to retrieve the total column water vapor amount. Hazy atmospheric conditions, however, introduce errors into this widely used technique. A new method based on radiance differences between clear and nearby shadowed surfaces, combined with ratios between water vapor absorbing and window regions, is presented that improves water vapor retrievals under hazy atmospheric conditions. Radiative transfer simulations are used to demonstrate the advantage offered by this technique.

© 2005 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.1100) Remote sensing and sensors : Aerosol detection
(280.1120) Remote sensing and sensors : Air pollution monitoring
(290.1090) Scattering : Aerosol and cloud effects

ToC Category:
Remote Sensing

History
Original Manuscript: March 4, 2005
Revised Manuscript: May 6, 2005
Manuscript Accepted: May 9, 2005
Published: November 10, 2005

Citation
North F. Larsen and K. Stamnes, "Use of shadows to retrieve water vapor in hazy atmospheres," Appl. Opt. 44, 6986-6994 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-32-6986

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